AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/10/01 15:23	flow	patch-triage	4m Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "KMSANReasoning": "", "NeedsKMSAN": false, "Reasoning": "The patch series refactors drvdata management, runtime PM callbacks, and AER error handling across the VFIO PCI subsystem and its variant drivers (mlx5, hisi_acc, ism, nvgrace-gpu, pds, qat, xe, and virtiovf).\n\nAll modified code is structurally unreachable in standard virtualized fuzzing environments (QEMU/GCE on amd64):\n1. The specialized VFIO drivers (mlx5, pds, nvgrace-gpu, xe, qat, hisi_acc) require physical vendor-specific ASICs (Mellanox ConnectX, Pensando DSC, NVIDIA Grace GPU, Intel Xe GPU, Intel QAT, HiSilicon Kunpeng) not emulated in standard QEMU, or are s390-specific (IBM ISM).\n2. The generic vfio-pci driver and virtio-vfio-pci driver specify PCI_DRIVER_OVERRIDE_DEVICE_VFIO (PCI_ID_F_VFIO_DRIVER_OVERRIDE), meaning they do not bind to any emulated PCI device at boot and can only be attached via manual sysfs driver_override configuration.\n3. The affected callbacks (.probe, .remove, PM suspend/resume, and AER error handling) cannot be exercised during standard syzkaller fuzzing runs.", "WorthFuzzing": false }
1/1	2026/10/01 15:23	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit 2393c4f73968907f21ae41492a5e7c5bb75dae58\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Thu Oct 1 15:23:23 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c\nindex 86362ec424a50..5b9bd3bcdc14b 100644\n--- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c\n+++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c\n@@ -16,6 +16,9 @@\n \n #include \"hisi_acc_vfio_pci.h\"\n \n+VFIO_PCI_CORE_DEFINE_CALLBACKS(hisi_acc_vf, struct hisi_acc_vf_core_device,\n+\t\t\t core_device)\n+\n /* Return 0 on VM acc device ready, -ETIMEDOUT hardware timeout /\n static int qm_wait_dev_not_ready(struct hisi_qm qm)\n {\n@@ -588,10 +591,7 @@ static int vf_qm_state_save(struct hisi_acc_vf_core_device hisi_acc_vdev,\n \n static struct hisi_acc_vf_core_device hisi_acc_drvdata(struct pci_dev pdev)\n {\n-\tstruct vfio_pci_core_device core_device = dev_get_drvdata(\u0026pdev-\u003edev);\n-\n-\treturn container_of(core_device, struct hisi_acc_vf_core_device,\n-\t\t\t core_device);\n+\treturn pci_get_drvdata(pdev);\n }\n \n /* Check the PF's RAS state and Function INT state /\n@@ -1416,9 +1416,8 @@ static int hisi_acc_vf_debug_check(struct seq_file seq, struct vfio_device vde\n static int hisi_acc_vf_debug_cmd(struct seq_file seq, void data)\n {\n \tstruct device vf_dev = seq-\u003eprivate;\n-\tstruct vfio_pci_core_device core_device = dev_get_drvdata(vf_dev);\n-\tstruct vfio_device vdev = \u0026core_device-\u003evdev;\n-\tstruct hisi_acc_vf_core_device hisi_acc_vdev = hisi_acc_get_vf_dev(vdev);\n+\tstruct hisi_acc_vf_core_device hisi_acc_vdev = dev_get_drvdata(vf_dev);\n+\tstruct vfio_device vdev = \u0026hisi_acc_vdev-\u003ecore_device.vdev;\n \tstruct hisi_qm vf_qm = \u0026hisi_acc_vdev-\u003evf_qm;\n \tu64 value;\n \tint ret;\n@@ -1445,9 +1444,8 @@ static int hisi_acc_vf_debug_cmd(struct seq_file seq, void data)\n static int hisi_acc_vf_dev_read(struct seq_file seq, void data)\n {\n \tstruct device vf_dev = seq-\u003eprivate;\n-\tstruct vfio_pci_core_device core_device = dev_get_drvdata(vf_dev);\n-\tstruct vfio_device vdev = \u0026core_device-\u003evdev;\n-\tstruct hisi_acc_vf_core_device hisi_acc_vdev = hisi_acc_get_vf_dev(vdev);\n+\tstruct hisi_acc_vf_core_device hisi_acc_vdev = dev_get_drvdata(vf_dev);\n+\tstruct vfio_device vdev = \u0026hisi_acc_vdev-\u003ecore_device.vdev;\n \tsize_t vf_data_sz = offsetofend(struct acc_vf_data, padding);\n \tstruct acc_vf_data vf_data;\n \tint ret;\n@@ -1492,9 +1490,7 @@ static int hisi_acc_vf_dev_read(struct seq_file seq, void data)\n static int hisi_acc_vf_migf_read(struct seq_file seq, void data)\n {\n \tstruct device vf_dev = seq-\u003eprivate;\n-\tstruct vfio_pci_core_device core_device = dev_get_drvdata(vf_dev);\n-\tstruct vfio_device vdev = \u0026core_device-\u003evdev;\n-\tstruct hisi_acc_vf_core_device hisi_acc_vdev = hisi_acc_get_vf_dev(vdev);\n+\tstruct hisi_acc_vf_core_device hisi_acc_vdev = dev_get_drvdata(vf_dev);\n \tsize_t vf_data_sz = offsetofend(struct acc_vf_data, padding);\n \tstruct hisi_acc_vf_migration_file debug_migf = hisi_acc_vdev-\u003edebug_migf;\n \n@@ -1687,7 +1683,7 @@ static int hisi_acc_vfio_pci_probe(struct pci_dev pdev, const struct pci_device\n \tif (IS_ERR(hisi_acc_vdev))\n \t\treturn PTR_ERR(hisi_acc_vdev);\n \n-\tdev_set_drvdata(\u0026pdev-\u003edev, \u0026hisi_acc_vdev-\u003ecore_device);\n+\tdev_set_drvdata(\u0026pdev-\u003edev, hisi_acc_vdev);\n \tret = vfio_pci_core_register_device(\u0026hisi_acc_vdev-\u003ecore_device);\n \tif (ret)\n \t\tgoto out_put_vdev;\n@@ -1721,7 +1717,7 @@ MODULE_DEVICE_TABLE(pci, hisi_acc_vfio_pci_table);\n static const struct pci_error_handlers hisi_acc_vf_err_handlers = {\n \t.reset_prepare = hisi_acc_vf_pci_reset_prepare,\n \t.reset_done = hisi_acc_vf_pci_aer_reset_done,\n-\t.error_detected = vfio_pci_core_aer_err_detected,\n+\t.error_detected = hisi_acc_vf_aer_err_detected,\n };\n \n static struct pci_driver hisi_acc_vfio_pci_driver = {\n@@ -1729,6 +1725,7 @@ static struct pci_driver hisi_acc_vfio_pci_driver = {\n \t.id_table = hisi_acc_vfio_pci_table,\n \t.probe = hisi_acc_vfio_pci_probe,\n \t.remove = hisi_acc_vfio_pci_remove,\n+\t.driver = { .pm = \u0026hisi_acc_vf_pm_ops },\n \t.err_handler = \u0026hisi_acc_vf_err_handlers,\n \t.driver_managed_dma = true,\n };\ndiff --git a/drivers/vfio/pci/ism/main.c b/drivers/vfio/pci/ism/main.c\nindex f83e09b915ed4..5f050b90df112 100644\n--- a/drivers/vfio/pci/ism/main.c\n+++ b/drivers/vfio/pci/ism/main.c\n@@ -47,6 +47,9 @@ struct ism_vfio_pci_core_device {\n \tstruct kmem_cache store_block_cache;\n };\n \n+VFIO_PCI_CORE_DEFINE_CALLBACKS(ism_vfio, struct ism_vfio_pci_core_device,\n+\t\t\t core_device)\n+\n static int ism_vfio_pci_open_device(struct vfio_device core_vdev)\n {\n \tstruct ism_vfio_pci_core_device ivpcd;\n@@ -363,7 +366,7 @@ static int ism_vfio_pci_probe(struct pci_dev pdev,\n \tif (IS_ERR(ivpcd))\n \t\treturn PTR_ERR(ivpcd);\n \n-\tdev_set_drvdata(\u0026pdev-\u003edev, \u0026ivpcd-\u003ecore_device);\n+\tdev_set_drvdata(\u0026pdev-\u003edev, ivpcd);\n \n \tret = vfio_pci_core_register_device(\u0026ivpcd-\u003ecore_device);\n \tif (ret)\n@@ -374,12 +377,7 @@ static int ism_vfio_pci_probe(struct pci_dev pdev,\n \n static void ism_vfio_pci_remove(struct pci_dev pdev)\n {\n-\tstruct vfio_pci_core_device core_device;\n-\tstruct ism_vfio_pci_core_device ivpcd;\n-\n-\tcore_device = dev_get_drvdata(\u0026pdev-\u003edev);\n-\tivpcd = container_of(core_device, struct ism_vfio_pci_core_device,\n-\t\t\t core_device);\n+\tstruct ism_vfio_pci_core_device ivpcd = pci_get_drvdata(pdev);\n \n \tvfio_pci_core_unregister_device(\u0026ivpcd-\u003ecore_device);\n \tvfio_put_device(\u0026ivpcd-\u003ecore_device.vdev);\n@@ -392,12 +390,17 @@ static const struct pci_device_id ism_device_table[] = {\n };\n MODULE_DEVICE_TABLE(pci, ism_device_table);\n \n+static const struct pci_error_handlers ism_vfio_err_handlers = {\n+\t.error_detected = ism_vfio_aer_err_detected,\n+};\n+\n static struct pci_driver ism_vfio_pci_driver = {\n \t.name = KBUILD_MODNAME,\n \t.id_table = ism_device_table,\n \t.probe = ism_vfio_pci_probe,\n \t.remove = ism_vfio_pci_remove,\n-\t.err_handler = \u0026vfio_pci_core_err_handlers,\n+\t.driver\t= { .pm = \u0026ism_vfio_pm_ops },\n+\t.err_handler = \u0026ism_vfio_err_handlers,\n \t.driver_managed_dma = true,\n };\n \ndiff --git a/drivers/vfio/pci/mlx5/main.c b/drivers/vfio/pci/mlx5/main.c\nindex de306dee1d1ad..a6e06190f9487 100644\n--- a/drivers/vfio/pci/mlx5/main.c\n+++ b/drivers/vfio/pci/mlx5/main.c\n@@ -21,6 +21,9 @@\n \n #include \"cmd.h\"\n \n+VFIO_PCI_CORE_DEFINE_CALLBACKS(mlx5vf, struct mlx5vf_pci_core_device,\n+\t\t\t core_device)\n+\n / Device specification max LOAD size /\n #define MAX_LOAD_SIZE (BIT_ULL(__mlx5_bit_sz(load_vhca_state_in, size)) - 1)\n \n@@ -28,10 +31,7 @@\n \n static struct mlx5vf_pci_core_device mlx5vf_drvdata(struct pci_dev pdev)\n {\n-\tstruct vfio_pci_core_device core_device = dev_get_drvdata(\u0026pdev-\u003edev);\n-\n-\treturn container_of(core_device, struct mlx5vf_pci_core_device,\n-\t\t\t core_device);\n+\treturn pci_get_drvdata(pdev);\n }\n \n static void mlx5vf_disable_fd(struct mlx5_vf_migration_file migf)\n@@ -1415,7 +1415,7 @@ static int mlx5vf_pci_probe(struct pci_dev pdev,\n \tif (IS_ERR(mvdev))\n \t\treturn PTR_ERR(mvdev);\n \n-\tdev_set_drvdata(\u0026pdev-\u003edev, \u0026mvdev-\u003ecore_device);\n+\tdev_set_drvdata(\u0026pdev-\u003edev, mvdev);\n \tret = vfio_pci_core_register_device(\u0026mvdev-\u003ecore_device);\n \tif (ret)\n \t\tgoto out_put_vdev;\n@@ -1443,7 +1443,7 @@ MODULE_DEVICE_TABLE(pci, mlx5vf_pci_table);\n \n static const struct pci_error_handlers mlx5vf_err_handlers = {\n \t.reset_done = mlx5vf_pci_aer_reset_done,\n-\t.error_detected = vfio_pci_core_aer_err_detected,\n+\t.error_detected = mlx5vf_aer_err_detected,\n };\n \n static struct pci_driver mlx5vf_pci_driver = {\n@@ -1451,6 +1451,7 @@ static struct pci_driver mlx5vf_pci_driver = {\n \t.id_table = mlx5vf_pci_table,\n \t.probe = mlx5vf_pci_probe,\n \t.remove = mlx5vf_pci_remove,\n+\t.driver\t= { .pm = \u0026mlx5vf_pm_ops },\n \t.err_handler = \u0026mlx5vf_err_handlers,\n \t.driver_managed_dma = true,\n };\ndiff --git a/drivers/vfio/pci/nvgrace-gpu/main.c b/drivers/vfio/pci/nvgrace-gpu/main.c\nindex 963fd8ded20d1..8040a9c045b36 100644\n--- a/drivers/vfio/pci/nvgrace-gpu/main.c\n+++ b/drivers/vfio/pci/nvgrace-gpu/main.c\n@@ -73,6 +73,9 @@ struct nvgrace_gpu_pci_core_device {\n \tint cxl_dvsec;\n };\n \n+VFIO_PCI_CORE_DEFINE_CALLBACKS(nvgrace_gpu, struct nvgrace_gpu_pci_core_device,\n+\t\t\t core_device)\n+\n static void nvgrace_gpu_init_fake_bar_emu_regs(struct vfio_device core_vdev)\n {\n \tstruct nvgrace_gpu_pci_core_device nvdev =\n@@ -1341,7 +1344,7 @@ static int nvgrace_gpu_probe(struct pci_dev pdev,\n \tif (ret)\n \t\tgoto out_put_vdev;\n \n-\tdev_set_drvdata(\u0026pdev-\u003edev, \u0026nvdev-\u003ecore_device);\n+\tdev_set_drvdata(\u0026pdev-\u003edev, nvdev);\n \n \tif (ops == \u0026nvgrace_gpu_pci_ops) {\n \t\tnvdev-\u003ehas_mig_hw_bug = nvgrace_gpu_has_mig_hw_bug(pdev);\n@@ -1372,10 +1375,10 @@ static int nvgrace_gpu_probe(struct pci_dev pdev,\n \n static void nvgrace_gpu_remove(struct pci_dev pdev)\n {\n-\tstruct vfio_pci_core_device core_device = dev_get_drvdata(\u0026pdev-\u003edev);\n+\tstruct nvgrace_gpu_pci_core_device nvdev = pci_get_drvdata(pdev);\n \n-\tvfio_pci_core_unregister_device(core_device);\n-\tvfio_put_device(\u0026core_device-\u003evdev);\n+\tvfio_pci_core_unregister_device(\u0026nvdev-\u003ecore_device);\n+\tvfio_put_device(\u0026nvdev-\u003ecore_device.vdev);\n }\n \n static const struct pci_device_id nvgrace_gpu_vfio_pci_table[] = {\n@@ -1407,17 +1410,14 @@ MODULE_DEVICE_TABLE(pci, nvgrace_gpu_vfio_pci_table);\n /\n static void nvgrace_gpu_vfio_pci_reset_done(struct pci_dev pdev)\n {\n-\tstruct vfio_pci_core_device core_device = dev_get_drvdata(\u0026pdev-\u003edev);\n-\tstruct nvgrace_gpu_pci_core_device nvdev =\n-\t\tcontainer_of(core_device, struct nvgrace_gpu_pci_core_device,\n-\t\t\t core_device);\n+\tstruct nvgrace_gpu_pci_core_device nvdev = pci_get_drvdata(pdev);\n \n \tnvdev-\u003ereset_done = true;\n }\n \n static const struct pci_error_handlers nvgrace_gpu_vfio_pci_err_handlers = {\n \t.reset_done = nvgrace_gpu_vfio_pci_reset_done,\n-\t.error_detected = vfio_pci_core_aer_err_detected,\n+\t.error_detected = nvgrace_gpu_aer_err_detected,\n };\n \n static struct pci_driver nvgrace_gpu_vfio_pci_driver = {\n@@ -1425,6 +1425,7 @@ static struct pci_driver nvgrace_gpu_vfio_pci_driver = {\n \t.id_table = nvgrace_gpu_vfio_pci_table,\n \t.probe = nvgrace_gpu_probe,\n \t.remove = nvgrace_gpu_remove,\n+\t.driver = { .pm = \u0026nvgrace_gpu_pm_ops },\n \t.err_handler = \u0026nvgrace_gpu_vfio_pci_err_handlers,\n \t.driver_managed_dma = true,\n };\ndiff --git a/drivers/vfio/pci/pds/pci_drv.c b/drivers/vfio/pci/pds/pci_drv.c\nindex 4923f18231263..66f4637e60cce 100644\n--- a/drivers/vfio/pci/pds/pci_drv.c\n+++ b/drivers/vfio/pci/pds/pci_drv.c\n@@ -16,6 +16,9 @@\n #include \"pci_drv.h\"\n #include \"cmds.h\"\n \n+VFIO_PCI_CORE_DEFINE_CALLBACKS(pds_vfio, struct pds_vfio_pci_device,\n+\t\t\t vfio_coredev)\n+\n #define PDS_VFIO_DRV_DESCRIPTION\t\"AMD/Pensando VFIO Device Driver\"\n #define PCI_VENDOR_ID_PENSANDO\t\t0x1dd8\n \n@@ -118,7 +121,7 @@ static int pds_vfio_pci_probe(struct pci_dev pdev,\n \tif (IS_ERR(pds_vfio))\n \t\treturn PTR_ERR(pds_vfio);\n \n-\tdev_set_drvdata(\u0026pdev-\u003edev, \u0026pds_vfio-\u003evfio_coredev);\n+\tdev_set_drvdata(\u0026pdev-\u003edev, pds_vfio);\n \n \terr = vfio_pci_core_register_device(\u0026pds_vfio-\u003evfio_coredev);\n \tif (err)\n@@ -173,7 +176,7 @@ static void pds_vfio_pci_aer_reset_done(struct pci_dev pdev)\n \n static const struct pci_error_handlers pds_vfio_pci_err_handlers = {\n \t.reset_done = pds_vfio_pci_aer_reset_done,\n-\t.error_detected = vfio_pci_core_aer_err_detected,\n+\t.error_detected = pds_vfio_aer_err_detected,\n };\n \n static struct pci_driver pds_vfio_pci_driver = {\n@@ -181,6 +184,7 @@ static struct pci_driver pds_vfio_pci_driver = {\n \t.id_table = pds_vfio_pci_table,\n \t.probe = pds_vfio_pci_probe,\n \t.remove = pds_vfio_pci_remove,\n+\t.driver = { .pm = \u0026pds_vfio_pm_ops },\n \t.err_handler = \u0026pds_vfio_pci_err_handlers,\n \t.driver_managed_dma = true,\n };\ndiff --git a/drivers/vfio/pci/pds/vfio_dev.c b/drivers/vfio/pci/pds/vfio_dev.c\nindex be103c74e9695..6d2b2dc61a280 100644\n--- a/drivers/vfio/pci/pds/vfio_dev.c\n+++ b/drivers/vfio/pci/pds/vfio_dev.c\n@@ -20,10 +20,7 @@ struct device pds_vfio_to_dev(struct pds_vfio_pci_device pds_vfio)\n \n struct pds_vfio_pci_device pds_vfio_pci_drvdata(struct pci_dev pdev)\n {\n-\tstruct vfio_pci_core_device core_device = dev_get_drvdata(\u0026pdev-\u003edev);\n-\n-\treturn container_of(core_device, struct pds_vfio_pci_device,\n-\t\t\t vfio_coredev);\n+\treturn pci_get_drvdata(pdev);\n }\n \n void pds_vfio_reset(struct pds_vfio_pci_device pds_vfio,\ndiff --git a/drivers/vfio/pci/qat/main.c b/drivers/vfio/pci/qat/main.c\nindex 60ff907b6a67a..e52ba61094454 100644\n--- a/drivers/vfio/pci/qat/main.c\n+++ b/drivers/vfio/pci/qat/main.c\n@@ -55,6 +55,9 @@ struct qat_vf_core_device {\n \tstruct qat_vf_migration_file saving_migf;\n };\n \n+VFIO_PCI_CORE_DEFINE_CALLBACKS(qat_vf, struct qat_vf_core_device,\n+\t\t\t core_device)\n+\n static int qat_vf_pci_open_device(struct vfio_device core_vdev)\n {\n \tstruct qat_vf_core_device qat_vdev =\n@@ -623,9 +626,7 @@ static const struct vfio_device_ops qat_vf_pci_ops = {\n \n static struct qat_vf_core_device qat_vf_drvdata(struct pci_dev pdev)\n {\n-\tstruct vfio_pci_core_device core_device = pci_get_drvdata(pdev);\n-\n-\treturn container_of(core_device, struct qat_vf_core_device, core_device);\n+\treturn pci_get_drvdata(pdev);\n }\n \n static void qat_vf_pci_aer_reset_done(struct pci_dev pdev)\n@@ -651,7 +652,7 @@ qat_vf_vfio_pci_probe(struct pci_dev pdev, const struct pci_device_id id)\n \tif (IS_ERR(qat_vdev))\n \t\treturn PTR_ERR(qat_vdev);\n \n-\tpci_set_drvdata(pdev, \u0026qat_vdev-\u003ecore_device);\n+\tpci_set_drvdata(pdev, qat_vdev);\n \tret = vfio_pci_core_register_device(\u0026qat_vdev-\u003ecore_device);\n \tif (ret)\n \t\tgoto out_put_device;\n@@ -686,7 +687,7 @@ MODULE_DEVICE_TABLE(pci, qat_vf_vfio_pci_table);\n \n static const struct pci_error_handlers qat_vf_err_handlers = {\n \t.reset_done = qat_vf_pci_aer_reset_done,\n-\t.error_detected = vfio_pci_core_aer_err_detected,\n+\t.error_detected = qat_vf_aer_err_detected,\n };\n \n static struct pci_driver qat_vf_vfio_pci_driver = {\n@@ -694,6 +695,7 @@ static struct pci_driver qat_vf_vfio_pci_driver = {\n \t.id_table = qat_vf_vfio_pci_table,\n \t.probe = qat_vf_vfio_pci_probe,\n \t.remove = qat_vf_vfio_pci_remove,\n+\t.driver\t= { .pm = \u0026qat_vf_pm_ops },\n \t.err_handler = \u0026qat_vf_err_handlers,\n \t.driver_managed_dma = true,\n };\ndiff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c\nindex 830369ff878db..14801419bc1d5 100644\n--- a/drivers/vfio/pci/vfio_pci.c\n+++ b/drivers/vfio/pci/vfio_pci.c\n@@ -223,13 +223,44 @@ static const struct pci_device_id vfio_pci_table[] = {\n \n MODULE_DEVICE_TABLE(pci, vfio_pci_table);\n \n+static int __maybe_unused vfio_pci_pm_suspend(struct device dev)\n+{\n+\tstruct vfio_pci_core_device vdev = dev_get_drvdata(dev);\n+\n+\treturn vfio_pci_core_runtime_suspend(vdev);\n+}\n+\n+static int __maybe_unused vfio_pci_pm_resume(struct device dev)\n+{\n+\tstruct vfio_pci_core_device vdev = dev_get_drvdata(dev);\n+\n+\treturn vfio_pci_core_runtime_resume(vdev);\n+}\n+\n+static const struct dev_pm_ops vfio_pci_pm_ops = {\n+\tSET_RUNTIME_PM_OPS(vfio_pci_pm_suspend, vfio_pci_pm_resume, NULL)\n+};\n+\n+static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev pdev,\n+\t\t\t\t\t pci_channel_state_t state)\n+{\n+\tstruct vfio_pci_core_device vdev = pci_get_drvdata(pdev);\n+\n+\treturn vfio_pci_core_aer_err_detected(vdev, state);\n+}\n+\n+static const struct pci_error_handlers vfio_pci_err_handlers = {\n+\t.error_detected = vfio_pci_aer_err_detected,\n+};\n+\n static struct pci_driver vfio_pci_driver = {\n \t.name\t\t\t= \"vfio-pci\",\n \t.id_table\t\t= vfio_pci_table,\n \t.probe\t\t\t= vfio_pci_probe,\n \t.remove\t\t\t= vfio_pci_remove,\n \t.sriov_configure\t= vfio_pci_sriov_configure,\n-\t.err_handler\t\t= \u0026vfio_pci_core_err_handlers,\n+\t.err_handler\t\t= \u0026vfio_pci_err_handlers,\n+\t.driver\t\t= { .pm = \u0026vfio_pci_pm_ops },\n \t.driver_managed_dma\t= true,\n };\n \ndiff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c\nindex 6757054e9d875..7c3e0eb39c503 100644\n--- a/drivers/vfio/pci/vfio_pci_core.c\n+++ b/drivers/vfio/pci/vfio_pci_core.c\n@@ -154,6 +154,12 @@ static inline void vfio_pci_core_debugfs_init(struct vfio_pci_core_device vdev)\n }\n #endif /* CONFIG_VFIO_DEBUGFS /\n \n+static unsigned int vfio_pci_vga_decode_all(struct pci_dev pdev, bool single_vga)\n+{\n+\treturn VGA_RSRC_NORMAL_IO \| VGA_RSRC_NORMAL_MEM \|\n+\t VGA_RSRC_LEGACY_IO \| VGA_RSRC_LEGACY_MEM;\n+}\n+\n /\n Our VGA arbiter participation is limited since we don't know anything\n * about the device itself. However, if the device is the only VGA device\n@@ -162,16 +168,14 @@ static inline void vfio_pci_core_debugfs_init(struct vfio_pci_core_device vdev)\n has no way to get to it and routing can be disabled externally at the\n * bridge.\n /\n-static unsigned int vfio_pci_set_decode(struct pci_dev pdev, bool single_vga)\n+static unsigned int vfio_pci_vga_decode_novga(struct pci_dev pdev, bool single_vga)\n {\n-\tstruct vfio_pci_core_device vdev = dev_get_drvdata(\u0026pdev-\u003edev);\n \tstruct pci_dev tmp = NULL;\n \tunsigned char max_busnr;\n \tunsigned int decodes;\n \n-\tif (single_vga \|\| !vfio_vga_disabled(vdev) \|\| pci_is_root_bus(pdev-\u003ebus))\n-\t\treturn VGA_RSRC_NORMAL_IO \| VGA_RSRC_NORMAL_MEM \|\n-\t\t VGA_RSRC_LEGACY_IO \| VGA_RSRC_LEGACY_MEM;\n+\tif (single_vga \|\| pci_is_root_bus(pdev-\u003ebus))\n+\t\treturn vfio_pci_vga_decode_all(pdev, single_vga);\n \n \tmax_busnr = pci_bus_max_busnr(pdev-\u003ebus);\n \tdecodes = VGA_RSRC_NORMAL_IO \| VGA_RSRC_NORMAL_MEM;\n@@ -488,10 +492,8 @@ static int vfio_pci_core_pm_exit(struct vfio_pci_core_device vdev, u32 flags,\n }\n \n #ifdef CONFIG_PM\n-static int vfio_pci_core_runtime_suspend(struct device dev)\n+int vfio_pci_core_runtime_suspend(struct vfio_pci_core_device vdev)\n {\n-\tstruct vfio_pci_core_device vdev = dev_get_drvdata(dev);\n-\n \tdown_write(\u0026vdev-\u003ememory_lock);\n \t/\n \t * The user can move the device into D3hot state before invoking\n@@ -516,11 +518,10 @@ static int vfio_pci_core_runtime_suspend(struct device dev)\n \n \treturn 0;\n }\n+EXPORT_SYMBOL_GPL(vfio_pci_core_runtime_suspend);\n \n-static int vfio_pci_core_runtime_resume(struct device dev)\n+int vfio_pci_core_runtime_resume(struct vfio_pci_core_device vdev)\n {\n-\tstruct vfio_pci_core_device vdev = dev_get_drvdata(dev);\n-\n \t/\n \t Resume with a pm_wake_eventfd_ctx signals the eventfd and exit\n \t * low power mode.\n@@ -537,6 +538,7 @@ static int vfio_pci_core_runtime_resume(struct device dev)\n \n \treturn 0;\n }\n+EXPORT_SYMBOL_GPL(vfio_pci_core_runtime_resume);\n #endif / CONFIG_PM /\n \n /\n@@ -576,18 +578,6 @@ static void vfio_pci_core_map_bars(struct vfio_pci_core_device vdev)\n \t}\n }\n \n-/\n- * The pci-driver core runtime PM routines always save the device state\n- * before going into suspended state. If the device is going into low power\n- * state with only with runtime PM ops, then no explicit handling is needed\n- * for the devices which have NoSoftRst-.\n- /\n-static const struct dev_pm_ops vfio_pci_core_pm_ops = {\n-\tSET_RUNTIME_PM_OPS(vfio_pci_core_runtime_suspend,\n-\t\t\t vfio_pci_core_runtime_resume,\n-\t\t\t NULL)\n-};\n-\n int vfio_pci_core_enable(struct vfio_pci_core_device vdev)\n {\n \tstruct pci_dev pdev = vdev-\u003epdev;\n@@ -2149,20 +2139,27 @@ static void vfio_pci_vf_uninit(struct vfio_pci_core_device vdev)\n \n static int vfio_pci_vga_init(struct vfio_pci_core_device vdev)\n {\n+\tunsigned int (set_decode)(struct pci_dev pdev, bool single_vga);\n \tstruct pci_dev pdev = vdev-\u003epdev;\n \tint ret;\n \n \tif (!vfio_pci_is_vga(pdev))\n \t\treturn 0;\n \n+\t/* VGA access is fixed for the lifetime of this registration. /\n+\tif (vfio_vga_disabled(vdev))\n+\t\tset_decode = vfio_pci_vga_decode_novga;\n+\telse\n+\t\tset_decode = vfio_pci_vga_decode_all;\n+\n \tret = aperture_remove_conflicting_pci_devices(pdev, vdev-\u003evdev.ops-\u003ename);\n \tif (ret)\n \t\treturn ret;\n \n-\tret = vga_client_register(pdev, vfio_pci_set_decode);\n+\tret = vga_client_register(pdev, set_decode);\n \tif (ret)\n \t\treturn ret;\n-\tvga_set_legacy_decoding(pdev, vfio_pci_set_decode(pdev, false));\n+\tvga_set_legacy_decoding(pdev, set_decode(pdev, false));\n \treturn 0;\n }\n \n@@ -2221,10 +2218,6 @@ int vfio_pci_core_register_device(struct vfio_pci_core_device vdev)\n \tstruct device dev = \u0026pdev-\u003edev;\n \tint ret;\n \n-\t/ Drivers must set the vfio_pci_core_device to their drvdata /\n-\tif (WARN_ON(vdev != dev_get_drvdata(dev)))\n-\t\treturn -EINVAL;\n-\n \t/ Drivers must set a name. Required for sequestering SR-IOV VFs /\n \tif (WARN_ON(!vdev-\u003evdev.ops-\u003ename))\n \t\treturn -EINVAL;\n@@ -2292,7 +2285,6 @@ int vfio_pci_core_register_device(struct vfio_pci_core_device vdev)\n \t /\n \tvfio_pci_set_power_state(vdev, PCI_D0);\n \n-\tdev-\u003edriver-\u003epm = \u0026vfio_pci_core_pm_ops;\n \tpm_runtime_allow(dev);\n \tif (!vdev-\u003edisable_idle_d3)\n \t\tpm_runtime_put(dev);\n@@ -2333,10 +2325,9 @@ void vfio_pci_core_unregister_device(struct vfio_pci_core_device vdev)\n }\n EXPORT_SYMBOL_GPL(vfio_pci_core_unregister_device);\n \n-pci_ers_result_t vfio_pci_core_aer_err_detected(struct pci_dev pdev,\n+pci_ers_result_t vfio_pci_core_aer_err_detected(struct vfio_pci_core_device vdev,\n \t\t\t\t\t\tpci_channel_state_t state)\n {\n-\tstruct vfio_pci_core_device vdev = dev_get_drvdata(\u0026pdev-\u003edev);\n \tstruct vfio_pci_eventfd eventfd;\n \n \trcu_read_lock();\n@@ -2419,11 +2410,6 @@ int vfio_pci_core_sriov_configure(struct vfio_pci_core_device vdev,\n }\n EXPORT_SYMBOL_GPL(vfio_pci_core_sriov_configure);\n \n-const struct pci_error_handlers vfio_pci_core_err_handlers = {\n-\t.error_detected = vfio_pci_core_aer_err_detected,\n-};\n-EXPORT_SYMBOL_GPL(vfio_pci_core_err_handlers);\n-\n static bool vfio_dev_in_groups(struct vfio_device vdev,\n \t\t\t struct vfio_pci_group_info groups)\n {\ndiff --git a/drivers/vfio/pci/virtio/main.c b/drivers/vfio/pci/virtio/main.c\nindex d2e5cbca13c85..69c2bf864aa7d 100644\n--- a/drivers/vfio/pci/virtio/main.c\n+++ b/drivers/vfio/pci/virtio/main.c\n@@ -18,6 +18,9 @@\n \n #include \"common.h\"\n \n+VFIO_PCI_CORE_DEFINE_CALLBACKS(virtiovf, struct virtiovf_pci_core_device,\n+\t\t\t core_device)\n+\n static int virtiovf_pci_open_device(struct vfio_device core_vdev)\n {\n \tstruct virtiovf_pci_core_device virtvdev = container_of(core_vdev,\n@@ -174,7 +177,7 @@ static int virtiovf_pci_probe(struct pci_dev pdev,\n \tif (sup_lm)\n \t\tvirtiovf_set_migratable(virtvdev);\n \n-\tdev_set_drvdata(\u0026pdev-\u003edev, \u0026virtvdev-\u003ecore_device);\n+\tdev_set_drvdata(\u0026pdev-\u003edev, virtvdev);\n \tret = vfio_pci_core_register_device(\u0026virtvdev-\u003ecore_device);\n \tif (ret)\n \t\tgoto out;\n@@ -211,7 +214,7 @@ static void virtiovf_pci_aer_reset_done(struct pci_dev pdev)\n \n static const struct pci_error_handlers virtiovf_err_handlers = {\n \t.reset_done = virtiovf_pci_aer_reset_done,\n-\t.error_detected = vfio_pci_core_aer_err_detected,\n+\t.error_detected = virtiovf_aer_err_detected,\n };\n \n static struct pci_driver virtiovf_pci_driver = {\n@@ -219,6 +222,7 @@ static struct pci_driver virtiovf_pci_driver = {\n \t.id_table = virtiovf_pci_table,\n \t.probe = virtiovf_pci_probe,\n \t.remove = virtiovf_pci_remove,\n+\t.driver = { .pm = \u0026virtiovf_pm_ops },\n \t.err_handler = \u0026virtiovf_err_handlers,\n \t.driver_managed_dma = true,\n };\ndiff --git a/drivers/vfio/pci/xe/main.c b/drivers/vfio/pci/xe/main.c\nindex cbff5af385ef5..18a87ac68841a 100644\n--- a/drivers/vfio/pci/xe/main.c\n+++ b/drivers/vfio/pci/xe/main.c\n@@ -38,6 +38,9 @@ struct xe_vfio_pci_core_device {\n \tstruct xe_vfio_pci_migration_file migf;\n };\n \n+VFIO_PCI_CORE_DEFINE_CALLBACKS(xe_vfio, struct xe_vfio_pci_core_device,\n+\t\t\t core_device)\n+\n #define xe_vdev_to_dev(xe_vdev) (\u0026(xe_vdev)-\u003ecore_device.pdev-\u003edev)\n \n static void xe_vfio_pci_disable_file(struct xe_vfio_pci_migration_file migf)\n@@ -140,7 +143,7 @@ static void xe_vfio_pci_reset_done(struct pci_dev pdev)\n static const struct pci_error_handlers xe_vfio_pci_err_handlers = {\n \t.reset_prepare = xe_vfio_pci_reset_prepare,\n \t.reset_done = xe_vfio_pci_reset_done,\n-\t.error_detected = vfio_pci_core_aer_err_detected,\n+\t.error_detected = xe_vfio_aer_err_detected,\n };\n \n static int xe_vfio_pci_open_device(struct vfio_device core_vdev)\n@@ -550,7 +553,7 @@ static int xe_vfio_pci_probe(struct pci_dev pdev, const struct pci_device_id i\n \tif (IS_ERR(xe_vdev))\n \t\treturn PTR_ERR(xe_vdev);\n \n-\tdev_set_drvdata(\u0026pdev-\u003edev, \u0026xe_vdev-\u003ecore_device);\n+\tdev_set_drvdata(\u0026pdev-\u003edev, xe_vdev);\n \n \tret = vfio_pci_core_register_device(\u0026xe_vdev-\u003ecore_device);\n \tif (ret) {\n@@ -586,6 +589,7 @@ static struct pci_driver xe_vfio_pci_driver = {\n \t.id_table = xe_vfio_pci_table,\n \t.probe = xe_vfio_pci_probe,\n \t.remove = xe_vfio_pci_remove,\n+\t.driver = { .pm = \u0026xe_vfio_pm_ops },\n \t.err_handler = \u0026xe_vfio_pci_err_handlers,\n \t.driver_managed_dma = true,\n };\ndiff --git a/include/linux/vfio_pci_core.h b/include/linux/vfio_pci_core.h\nindex 9a1674c152aa2..a7286100c4f92 100644\n--- a/include/linux/vfio_pci_core.h\n+++ b/include/linux/vfio_pci_core.h\n@@ -8,6 +8,7 @@\n Author: Tom Lyon, pugs@cisco.com\n /\n \n+#include \u003clinux/device.h\u003e\n #include \u003clinux/mutex.h\u003e\n #include \u003clinux/pci.h\u003e\n #include \u003clinux/vfio.h\u003e\n@@ -16,6 +17,7 @@\n #include \u003clinux/types.h\u003e\n #include \u003clinux/uuid.h\u003e\n #include \u003clinux/notifier.h\u003e\n+#include \u003clinux/pm.h\u003e\n \n #ifndef VFIO_PCI_CORE_H\n #define VFIO_PCI_CORE_H\n@@ -168,7 +170,6 @@ int vfio_pci_core_init_dev(struct vfio_device core_vdev);\n void vfio_pci_core_release_dev(struct vfio_device core_vdev);\n int vfio_pci_core_register_device(struct vfio_pci_core_device vdev);\n void vfio_pci_core_unregister_device(struct vfio_pci_core_device vdev);\n-extern const struct pci_error_handlers vfio_pci_core_err_handlers;\n int vfio_pci_core_sriov_configure(struct vfio_pci_core_device vdev,\n \t\t\t\t int nr_virtfn);\n long vfio_pci_core_ioctl(struct vfio_device core_vdev, unsigned int cmd,\n@@ -193,8 +194,6 @@ int vfio_pci_core_match_token_uuid(struct vfio_device core_vdev,\n int vfio_pci_core_enable(struct vfio_pci_core_device vdev);\n void vfio_pci_core_disable(struct vfio_pci_core_device vdev);\n void vfio_pci_core_finish_enable(struct vfio_pci_core_device vdev);\n-pci_ers_result_t vfio_pci_core_aer_err_detected(struct pci_dev pdev,\n-\t\t\t\t\t\tpci_channel_state_t state);\n ssize_t vfio_pci_core_do_io_rw(struct vfio_pci_core_device vdev, bool test_mem,\n \t\t\t void __iomem io, char __user buf,\n \t\t\t loff_t off, size_t count, size_t x_start,\n@@ -260,4 +259,41 @@ vfio_pci_core_get_iomap(struct vfio_pci_core_device vdev, unsigned int bar)\n int vfio_pci_dma_buf_iommufd_map(struct dma_buf_attachment attachment,\n \t\t\t\t struct phys_vec phys);\n \n+int vfio_pci_core_runtime_suspend(struct vfio_pci_core_device vdev);\n+int vfio_pci_core_runtime_resume(struct vfio_pci_core_device vdev);\n+pci_ers_result_t vfio_pci_core_aer_err_detected(struct vfio_pci_core_device vdev,\n+\t\t\t\t\t\tpci_channel_state_t state);\n+\n+/\n+ * Per-driver PM/AER trampolines. driver_data points to the driver's private\n+ * structure, which embeds a struct vfio_pci_core_device.\n+ \n+ @name: prefix for \u003cname\u003e_pm_ops and \u003cname\u003e_aer_err_detected\n+ * @drv_type: type of the driver's private structure, including struct\n+ * @member: member containing the struct vfio_pci_core_device\n+ /\n+#define VFIO_PCI_CORE_DEFINE_CALLBACKS(name, drv_type, member) \\\n+static int __maybe_unused name##_pm_suspend(struct device dev) \\\n+{ \\\n+\tdrv_type drvdata = dev_get_drvdata(dev); \\\n+\t\t\t\t\t\t\t\t\t \\\n+\treturn vfio_pci_core_runtime_suspend(\u0026drvdata-\u003emember); \\\n+} \\\n+static int __maybe_unused name##_pm_resume(struct device dev) \\\n+{ \\\n+\tdrv_type drvdata = dev_get_drvdata(dev); \\\n+\t\t\t\t\t\t\t\t\t \\\n+\treturn vfio_pci_core_runtime_resume(\u0026drvdata-\u003emember); \\\n+} \\\n+static const struct dev_pm_ops name##_pm_ops = { \\\n+\tSET_RUNTIME_PM_OPS(name##_pm_suspend, name##_pm_resume, NULL) \\\n+}; \\\n+static pci_ers_result_t name##_aer_err_detected(struct pci_dev pdev, \\\n+\t\t\t\t\t pci_channel_state_t state) \\\n+{ \\\n+\tdrv_type drvdata = pci_get_drvdata(pdev); \\\n+\t\t\t\t\t\t\t\t\t \\\n+\treturn vfio_pci_core_aer_err_detected(\u0026drvdata-\u003emember, state); \\\n+}\n+\n #endif / VFIO_PCI_CORE_H */\n" }
2/1	2026/10/01 15:23	agent	patch-evaluator	4m Model: core Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch series refactors drvdata management, runtime PM callbacks, and AER error handling across the VFIO PCI subsystem and its variant drivers (mlx5, hisi_acc, ism, nvgrace-gpu, pds, qat, xe, and virtiovf).\n\nAll modified code is structurally unreachable in standard virtualized fuzzing environments (QEMU/GCE on amd64):\n1. The specialized VFIO drivers (mlx5, pds, nvgrace-gpu, xe, qat, hisi_acc) require physical vendor-specific ASICs (Mellanox ConnectX, Pensando DSC, NVIDIA Grace GPU, Intel Xe GPU, Intel QAT, HiSilicon Kunpeng) not emulated in standard QEMU, or are s390-specific (IBM ISM).\n2. The generic vfio-pci driver and virtio-vfio-pci driver specify PCI_DRIVER_OVERRIDE_DEVICE_VFIO (PCI_ID_F_VFIO_DRIVER_OVERRIDE), meaning they do not bind to any emulated PCI device at boot and can only be attached via manual sysfs driver_override configuration.\n3. The affected callbacks (.probe, .remove, PM suspend/resume, and AER error handling) cannot be exercised during standard syzkaller fuzzing runs.", "WorthFuzzing": false } Instruction: You are an expert Linux kernel maintainer and security engineer. Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on internal assumptions. You must actively use your code access tools to inspect the actual source code, callers, and surrounding context. ================================================================================ 1. CORE TRIAGE PHILOSOPHY ================================================================================ The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs, and newly triggered assertions introduced by the patch series. - REACHABILITY IS THE PRIMARY GATE: Fuzzing can only discover bugs in code that can actually execute in standard virtualized environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap). If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed, regardless of whether it adds assertions or complex logic. - DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS: Patch authors routinely label changes as "cleanups", "refactorings", or state "No functional change intended". Do NOT take these claims at face value. Code refactorings that rearrange logic, introduce helper functions, or alter state management in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs. If reachable executable code is modified or refactored, it MUST be fuzzed. - NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED: When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON, VM_WARN_ON, BUG_ON, lockdep_assert) in reachable code paths, it enforces new or stricter invariants. Even if the author believes the invariant always holds, fuzzing is essential to verify whether an unusual sequence of operations can violate it. ================================================================================ 2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA) ================================================================================ Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories: - Non-kernel and non-executable changes: * Modifications to Documentation/, comments, or spelling fixes. * User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/) that do not affect the compiled kernel image (vmlinux) or kernel modules. * Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints that do not alter control flow or data structures. * Build system or Kconfig changes that do not alter compiled C logic. - Structurally unreachable hardware: * Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU. - Unreachable execution paths: * Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during physical PCI hot-unplug or manual sysfs driver unbinding. * Code paths exclusive to architectures other than the target architecture. ================================================================================ 3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA) ================================================================================ Return WorthFuzzing=true whenever the patch touches reachable executable code, including: - Core Subsystems: * Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/), BPF, scheduler, core networking, VFS, or syscall handling. - Refactorings and Code Cleanups: * Any restructuring of reachable data structures, helper abstractions, or algorithm flows. - Runtime Assertions and Defensive Checks: * Any introduction or alteration of assertions (WARN_ON, VM_WARN_ON, BUG_ON, etc.) in reachable paths. - Reachable Drivers and Protocols: Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.). ================================================================================ 4. EXTRACTING FocusSymbols (PREVENTING DILUTION) ================================================================================ When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer: - AVOID UBIQUITOUS LIFECYCLE HOT-PATHS: Do NOT list generic, ubiquitous functions called by almost every program in the corpus (including, but not limited to: general memory allocators and deallocators, page fault and trap handlers, or core synchronization primitives; this is not an exhaustive list). Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused", which severely dilutes fuzzing effort away from the actual changes. - TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS: List functions that specifically implement the logic being added or altered, or direct API entrypoints for the subsystem feature under review. - HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h): Compiler-inlined static functions (such as static inlines in mm/.h or include/linux/.h) lack distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters. If the changes are primarily in static inline helpers, identify non-static, feature-specific caller functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers). ================================================================================ 5. IDENTIFYING EnableConfigs ================================================================================ Identify any specific CONFIG_ options required to properly compile and reach the modified code: - Inspect Kconfig files and #ifdef guards; do not make assumptions. - Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed. - Strip any 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4"). Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: Target architecture: amd64 For your convenience, here is the diff of the changes: commit 2393c4f73968907f21ae41492a5e7c5bb75dae58 Author: syz-cluster <triage@syzkaller.com> Date: Thu Oct 1 15:23:23 2026 +0000 syz-cluster: applied patch under review diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c index 86362ec424a50..5b9bd3bcdc14b 100644 --- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c +++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c @@ -16,6 +16,9 @@ #include "hisi_acc_vfio_pci.h" +VFIO_PCI_CORE_DEFINE_CALLBACKS(hisi_acc_vf, struct hisi_acc_vf_core_device, + core_device) + /* Return 0 on VM acc device ready, -ETIMEDOUT hardware timeout / static int qm_wait_dev_not_ready(struct hisi_qm qm) { @@ -588,10 +591,7 @@ static int vf_qm_state_save(struct hisi_acc_vf_core_device hisi_acc_vdev, static struct hisi_acc_vf_core_device hisi_acc_drvdata(struct pci_dev pdev) { - struct vfio_pci_core_device core_device = dev_get_drvdata(&pdev->dev); - - return container_of(core_device, struct hisi_acc_vf_core_device, - core_device); + return pci_get_drvdata(pdev); } /* Check the PF's RAS state and Function INT state / @@ -1416,9 +1416,8 @@ static int hisi_acc_vf_debug_check(struct seq_file seq, struct vfio_device vde static int hisi_acc_vf_debug_cmd(struct seq_file seq, void data) { struct device vf_dev = seq->private; - struct vfio_pci_core_device core_device = dev_get_drvdata(vf_dev); - struct vfio_device vdev = &core_device->vdev; - struct hisi_acc_vf_core_device hisi_acc_vdev = hisi_acc_get_vf_dev(vdev); + struct hisi_acc_vf_core_device hisi_acc_vdev = dev_get_drvdata(vf_dev); + struct vfio_device vdev = &hisi_acc_vdev->core_device.vdev; struct hisi_qm vf_qm = &hisi_acc_vdev->vf_qm; u64 value; int ret; @@ -1445,9 +1444,8 @@ static int hisi_acc_vf_debug_cmd(struct seq_file seq, void data) static int hisi_acc_vf_dev_read(struct seq_file seq, void data) { struct device vf_dev = seq->private; - struct vfio_pci_core_device core_device = dev_get_drvdata(vf_dev); - struct vfio_device vdev = &core_device->vdev; - struct hisi_acc_vf_core_device hisi_acc_vdev = hisi_acc_get_vf_dev(vdev); + struct hisi_acc_vf_core_device hisi_acc_vdev = dev_get_drvdata(vf_dev); + struct vfio_device vdev = &hisi_acc_vdev->core_device.vdev; size_t vf_data_sz = offsetofend(struct acc_vf_data, padding); struct acc_vf_data vf_data; int ret; @@ -1492,9 +1490,7 @@ static int hisi_acc_vf_dev_read(struct seq_file seq, void data) static int hisi_acc_vf_migf_read(struct seq_file seq, void data) { struct device vf_dev = seq->private; - struct vfio_pci_core_device core_device = dev_get_drvdata(vf_dev); - struct vfio_device vdev = &core_device->vdev; - struct hisi_acc_vf_core_device hisi_acc_vdev = hisi_acc_get_vf_dev(vdev); + struct hisi_acc_vf_core_device hisi_acc_vdev = dev_get_drvdata(vf_dev); size_t vf_data_sz = offsetofend(struct acc_vf_data, padding); struct hisi_acc_vf_migration_file debug_migf = hisi_acc_vdev->debug_migf; @@ -1687,7 +1683,7 @@ static int hisi_acc_vfio_pci_probe(struct pci_dev pdev, const struct pci_device if (IS_ERR(hisi_acc_vdev)) return PTR_ERR(hisi_acc_vdev); - dev_set_drvdata(&pdev->dev, &hisi_acc_vdev->core_device); + dev_set_drvdata(&pdev->dev, hisi_acc_vdev); ret = vfio_pci_core_register_device(&hisi_acc_vdev->core_device); if (ret) goto out_put_vdev; @@ -1721,7 +1717,7 @@ MODULE_DEVICE_TABLE(pci, hisi_acc_vfio_pci_table); static const struct pci_error_handlers hisi_acc_vf_err_handlers = { .reset_prepare = hisi_acc_vf_pci_reset_prepare, .reset_done = hisi_acc_vf_pci_aer_reset_done, - .error_detected = vfio_pci_core_aer_err_detected, + .error_detected = hisi_acc_vf_aer_err_detected, }; static struct pci_driver hisi_acc_vfio_pci_driver = { @@ -1729,6 +1725,7 @@ static struct pci_driver hisi_acc_vfio_pci_driver = { .id_table = hisi_acc_vfio_pci_table, .probe = hisi_acc_vfio_pci_probe, .remove = hisi_acc_vfio_pci_remove, + .driver = { .pm = &hisi_acc_vf_pm_ops }, .err_handler = &hisi_acc_vf_err_handlers, .driver_managed_dma = true, }; diff --git a/drivers/vfio/pci/ism/main.c b/drivers/vfio/pci/ism/main.c index f83e09b915ed4..5f050b90df112 100644 --- a/drivers/vfio/pci/ism/main.c +++ b/drivers/vfio/pci/ism/main.c @@ -47,6 +47,9 @@ struct ism_vfio_pci_core_device { struct kmem_cache store_block_cache; }; +VFIO_PCI_CORE_DEFINE_CALLBACKS(ism_vfio, struct ism_vfio_pci_core_device, + core_device) + static int ism_vfio_pci_open_device(struct vfio_device core_vdev) { struct ism_vfio_pci_core_device ivpcd; @@ -363,7 +366,7 @@ static int ism_vfio_pci_probe(struct pci_dev pdev, if (IS_ERR(ivpcd)) return PTR_ERR(ivpcd); - dev_set_drvdata(&pdev->dev, &ivpcd->core_device); + dev_set_drvdata(&pdev->dev, ivpcd); ret = vfio_pci_core_register_device(&ivpcd->core_device); if (ret) @@ -374,12 +377,7 @@ static int ism_vfio_pci_probe(struct pci_dev pdev, static void ism_vfio_pci_remove(struct pci_dev pdev) { - struct vfio_pci_core_device core_device; - struct ism_vfio_pci_core_device ivpcd; - - core_device = dev_get_drvdata(&pdev->dev); - ivpcd = container_of(core_device, struct ism_vfio_pci_core_device, - core_device); + struct ism_vfio_pci_core_device ivpcd = pci_get_drvdata(pdev); vfio_pci_core_unregister_device(&ivpcd->core_device); vfio_put_device(&ivpcd->core_device.vdev); @@ -392,12 +390,17 @@ static const struct pci_device_id ism_device_table[] = { }; MODULE_DEVICE_TABLE(pci, ism_device_table); +static const struct pci_error_handlers ism_vfio_err_handlers = { + .error_detected = ism_vfio_aer_err_detected, +}; + static struct pci_driver ism_vfio_pci_driver = { .name = KBUILD_MODNAME, .id_table = ism_device_table, .probe = ism_vfio_pci_probe, .remove = ism_vfio_pci_remove, - .err_handler = &vfio_pci_core_err_handlers, + .driver = { .pm = &ism_vfio_pm_ops }, + .err_handler = &ism_vfio_err_handlers, .driver_managed_dma = true, }; diff --git a/drivers/vfio/pci/mlx5/main.c b/drivers/vfio/pci/mlx5/main.c index de306dee1d1ad..a6e06190f9487 100644 --- a/drivers/vfio/pci/mlx5/main.c +++ b/drivers/vfio/pci/mlx5/main.c @@ -21,6 +21,9 @@ #include "cmd.h" +VFIO_PCI_CORE_DEFINE_CALLBACKS(mlx5vf, struct mlx5vf_pci_core_device, + core_device) + / Device specification max LOAD size / #define MAX_LOAD_SIZE (BIT_ULL(__mlx5_bit_sz(load_vhca_state_in, size)) - 1) @@ -28,10 +31,7 @@ static struct mlx5vf_pci_core_device mlx5vf_drvdata(struct pci_dev pdev) { - struct vfio_pci_core_device core_device = dev_get_drvdata(&pdev->dev); - - return container_of(core_device, struct mlx5vf_pci_core_device, - core_device); + return pci_get_drvdata(pdev); } static void mlx5vf_disable_fd(struct mlx5_vf_migration_file migf) @@ -1415,7 +1415,7 @@ static int mlx5vf_pci_probe(struct pci_dev pdev, if (IS_ERR(mvdev)) return PTR_ERR(mvdev); - dev_set_drvdata(&pdev->dev, &mvdev->core_device); + dev_set_drvdata(&pdev->dev, mvdev); ret = vfio_pci_core_register_device(&mvdev->core_device); if (ret) goto out_put_vdev; @@ -1443,7 +1443,7 @@ MODULE_DEVICE_TABLE(pci, mlx5vf_pci_table); static const struct pci_error_handlers mlx5vf_err_handlers = { .reset_done = mlx5vf_pci_aer_reset_done, - .error_detected = vfio_pci_core_aer_err_detected, + .error_detected = mlx5vf_aer_err_detected, }; static struct pci_driver mlx5vf_pci_driver = { @@ -1451,6 +1451,7 @@ static struct pci_driver mlx5vf_pci_driver = { .id_table = mlx5vf_pci_table, .probe = mlx5vf_pci_probe, .remove = mlx5vf_pci_remove, + .driver = { .pm = &mlx5vf_pm_ops }, .err_handler = &mlx5vf_err_handlers, .driver_managed_dma = true, }; diff --git a/drivers/vfio/pci/nvgrace-gpu/main.c b/drivers/vfio/pci/nvgrace-gpu/main.c index 963fd8ded20d1..8040a9c045b36 100644 --- a/drivers/vfio/pci/nvgrace-gpu/main.c +++ b/drivers/vfio/pci/nvgrace-gpu/main.c @@ -73,6 +73,9 @@ struct nvgrace_gpu_pci_core_device { int cxl_dvsec; }; +VFIO_PCI_CORE_DEFINE_CALLBACKS(nvgrace_gpu, struct nvgrace_gpu_pci_core_device, + core_device) + static void nvgrace_gpu_init_fake_bar_emu_regs(struct vfio_device core_vdev) { struct nvgrace_gpu_pci_core_device nvdev = @@ -1341,7 +1344,7 @@ static int nvgrace_gpu_probe(struct pci_dev pdev, if (ret) goto out_put_vdev; - dev_set_drvdata(&pdev->dev, &nvdev->core_device); + dev_set_drvdata(&pdev->dev, nvdev); if (ops == &nvgrace_gpu_pci_ops) { nvdev->has_mig_hw_bug = nvgrace_gpu_has_mig_hw_bug(pdev); @@ -1372,10 +1375,10 @@ static int nvgrace_gpu_probe(struct pci_dev pdev, static void nvgrace_gpu_remove(struct pci_dev pdev) { - struct vfio_pci_core_device core_device = dev_get_drvdata(&pdev->dev); + struct nvgrace_gpu_pci_core_device nvdev = pci_get_drvdata(pdev); - vfio_pci_core_unregister_device(core_device); - vfio_put_device(&core_device->vdev); + vfio_pci_core_unregister_device(&nvdev->core_device); + vfio_put_device(&nvdev->core_device.vdev); } static const struct pci_device_id nvgrace_gpu_vfio_pci_table[] = { @@ -1407,17 +1410,14 @@ MODULE_DEVICE_TABLE(pci, nvgrace_gpu_vfio_pci_table); / static void nvgrace_gpu_vfio_pci_reset_done(struct pci_dev pdev) { - struct vfio_pci_core_device core_device = dev_get_drvdata(&pdev->dev); - struct nvgrace_gpu_pci_core_device nvdev = - container_of(core_device, struct nvgrace_gpu_pci_core_device, - core_device); + struct nvgrace_gpu_pci_core_device nvdev = pci_get_drvdata(pdev); nvdev->reset_done = true; } static const struct pci_error_handlers nvgrace_gpu_vfio_pci_err_handlers = { .reset_done = nvgrace_gpu_vfio_pci_reset_done, - .error_detected = vfio_pci_core_aer_err_detected, + .error_detected = nvgrace_gpu_aer_err_detected, }; static struct pci_driver nvgrace_gpu_vfio_pci_driver = { @@ -1425,6 +1425,7 @@ static struct pci_driver nvgrace_gpu_vfio_pci_driver = { .id_table = nvgrace_gpu_vfio_pci_table, .probe = nvgrace_gpu_probe, .remove = nvgrace_gpu_remove, + .driver = { .pm = &nvgrace_gpu_pm_ops }, .err_handler = &nvgrace_gpu_vfio_pci_err_handlers, .driver_managed_dma = true, }; diff --git a/drivers/vfio/pci/pds/pci_drv.c b/drivers/vfio/pci/pds/pci_drv.c index 4923f18231263..66f4637e60cce 100644 --- a/drivers/vfio/pci/pds/pci_drv.c +++ b/drivers/vfio/pci/pds/pci_drv.c @@ -16,6 +16,9 @@ #include "pci_drv.h" #include "cmds.h" +VFIO_PCI_CORE_DEFINE_CALLBACKS(pds_vfio, struct pds_vfio_pci_device, + vfio_coredev) + #define PDS_VFIO_DRV_DESCRIPTION "AMD/Pensando VFIO Device Driver" #define PCI_VENDOR_ID_PENSANDO 0x1dd8 @@ -118,7 +121,7 @@ static int pds_vfio_pci_probe(struct pci_dev pdev, if (IS_ERR(pds_vfio)) return PTR_ERR(pds_vfio); - dev_set_drvdata(&pdev->dev, &pds_vfio->vfio_coredev); + dev_set_drvdata(&pdev->dev, pds_vfio); err = vfio_pci_core_register_device(&pds_vfio->vfio_coredev); if (err) @@ -173,7 +176,7 @@ static void pds_vfio_pci_aer_reset_done(struct pci_dev pdev) static const struct pci_error_handlers pds_vfio_pci_err_handlers = { .reset_done = pds_vfio_pci_aer_reset_done, - .error_detected = vfio_pci_core_aer_err_detected, + .error_detected = pds_vfio_aer_err_detected, }; static struct pci_driver pds_vfio_pci_driver = { @@ -181,6 +184,7 @@ static struct pci_driver pds_vfio_pci_driver = { .id_table = pds_vfio_pci_table, .probe = pds_vfio_pci_probe, .remove = pds_vfio_pci_remove, + .driver = { .pm = &pds_vfio_pm_ops }, .err_handler = &pds_vfio_pci_err_handlers, .driver_managed_dma = true, }; diff --git a/drivers/vfio/pci/pds/vfio_dev.c b/drivers/vfio/pci/pds/vfio_dev.c index be103c74e9695..6d2b2dc61a280 100644 --- a/drivers/vfio/pci/pds/vfio_dev.c +++ b/drivers/vfio/pci/pds/vfio_dev.c @@ -20,10 +20,7 @@ struct device pds_vfio_to_dev(struct pds_vfio_pci_device pds_vfio) struct pds_vfio_pci_device pds_vfio_pci_drvdata(struct pci_dev pdev) { - struct vfio_pci_core_device core_device = dev_get_drvdata(&pdev->dev); - - return container_of(core_device, struct pds_vfio_pci_device, - vfio_coredev); + return pci_get_drvdata(pdev); } void pds_vfio_reset(struct pds_vfio_pci_device pds_vfio, diff --git a/drivers/vfio/pci/qat/main.c b/drivers/vfio/pci/qat/main.c index 60ff907b6a67a..e52ba61094454 100644 --- a/drivers/vfio/pci/qat/main.c +++ b/drivers/vfio/pci/qat/main.c @@ -55,6 +55,9 @@ struct qat_vf_core_device { struct qat_vf_migration_file saving_migf; }; +VFIO_PCI_CORE_DEFINE_CALLBACKS(qat_vf, struct qat_vf_core_device, + core_device) + static int qat_vf_pci_open_device(struct vfio_device core_vdev) { struct qat_vf_core_device qat_vdev = @@ -623,9 +626,7 @@ static const struct vfio_device_ops qat_vf_pci_ops = { static struct qat_vf_core_device qat_vf_drvdata(struct pci_dev pdev) { - struct vfio_pci_core_device core_device = pci_get_drvdata(pdev); - - return container_of(core_device, struct qat_vf_core_device, core_device); + return pci_get_drvdata(pdev); } static void qat_vf_pci_aer_reset_done(struct pci_dev pdev) @@ -651,7 +652,7 @@ qat_vf_vfio_pci_probe(struct pci_dev pdev, const struct pci_device_id id) if (IS_ERR(qat_vdev)) return PTR_ERR(qat_vdev); - pci_set_drvdata(pdev, &qat_vdev->core_device); + pci_set_drvdata(pdev, qat_vdev); ret = vfio_pci_core_register_device(&qat_vdev->core_device); if (ret) goto out_put_device; @@ -686,7 +687,7 @@ MODULE_DEVICE_TABLE(pci, qat_vf_vfio_pci_table); static const struct pci_error_handlers qat_vf_err_handlers = { .reset_done = qat_vf_pci_aer_reset_done, - .error_detected = vfio_pci_core_aer_err_detected, + .error_detected = qat_vf_aer_err_detected, }; static struct pci_driver qat_vf_vfio_pci_driver = { @@ -694,6 +695,7 @@ static struct pci_driver qat_vf_vfio_pci_driver = { .id_table = qat_vf_vfio_pci_table, .probe = qat_vf_vfio_pci_probe, .remove = qat_vf_vfio_pci_remove, + .driver = { .pm = &qat_vf_pm_ops }, .err_handler = &qat_vf_err_handlers, .driver_managed_dma = true, }; diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c index 830369ff878db..14801419bc1d5 100644 --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -223,13 +223,44 @@ static const struct pci_device_id vfio_pci_table[] = { MODULE_DEVICE_TABLE(pci, vfio_pci_table); +static int __maybe_unused vfio_pci_pm_suspend(struct device dev) +{ + struct vfio_pci_core_device vdev = dev_get_drvdata(dev); + + return vfio_pci_core_runtime_suspend(vdev); +} + +static int __maybe_unused vfio_pci_pm_resume(struct device dev) +{ + struct vfio_pci_core_device vdev = dev_get_drvdata(dev); + + return vfio_pci_core_runtime_resume(vdev); +} + +static const struct dev_pm_ops vfio_pci_pm_ops = { + SET_RUNTIME_PM_OPS(vfio_pci_pm_suspend, vfio_pci_pm_resume, NULL) +}; + +static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev pdev, + pci_channel_state_t state) +{ + struct vfio_pci_core_device vdev = pci_get_drvdata(pdev); + + return vfio_pci_core_aer_err_detected(vdev, state); +} + +static const struct pci_error_handlers vfio_pci_err_handlers = { + .error_detected = vfio_pci_aer_err_detected, +}; + static struct pci_driver vfio_pci_driver = { .name = "vfio-pci", .id_table = vfio_pci_table, .probe = vfio_pci_probe, .remove = vfio_pci_remove, .sriov_configure = vfio_pci_sriov_configure, - .err_handler = &vfio_pci_core_err_handlers, + .err_handler = &vfio_pci_err_handlers, + .driver = { .pm = &vfio_pci_pm_ops }, .driver_managed_dma = true, }; diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c index 6757054e9d875..7c3e0eb39c503 100644 --- a/drivers/vfio/pci/vfio_pci_core.c +++ b/drivers/vfio/pci/vfio_pci_core.c @@ -154,6 +154,12 @@ static inline void vfio_pci_core_debugfs_init(struct vfio_pci_core_device vdev) } #endif /* CONFIG_VFIO_DEBUGFS / +static unsigned int vfio_pci_vga_decode_all(struct pci_dev pdev, bool single_vga) +{ + return VGA_RSRC_NORMAL_IO \| VGA_RSRC_NORMAL_MEM \| + VGA_RSRC_LEGACY_IO \| VGA_RSRC_LEGACY_MEM; +} + /* * Our VGA arbiter participation is limited since we don't know anything * about the device itself. However, if the device is the only VGA device @@ -162,16 +168,14 @@ static inline void vfio_pci_core_debugfs_init(struct vfio_pci_core_device vdev) has no way to get to it and routing can be disabled externally at the * bridge. / -static unsigned int vfio_pci_set_decode(struct pci_dev pdev, bool single_vga) +static unsigned int vfio_pci_vga_decode_novga(struct pci_dev pdev, bool single_vga) { - struct vfio_pci_core_device vdev = dev_get_drvdata(&pdev->dev); struct pci_dev tmp = NULL; unsigned char max_busnr; unsigned int decodes; - if (single_vga \|\| !vfio_vga_disabled(vdev) \|\| pci_is_root_bus(pdev->bus)) - return VGA_RSRC_NORMAL_IO \| VGA_RSRC_NORMAL_MEM \| - VGA_RSRC_LEGACY_IO \| VGA_RSRC_LEGACY_MEM; + if (single_vga \|\| pci_is_root_bus(pdev->bus)) + return vfio_pci_vga_decode_all(pdev, single_vga); max_busnr = pci_bus_max_busnr(pdev->bus); decodes = VGA_RSRC_NORMAL_IO \| VGA_RSRC_NORMAL_MEM; @@ -488,10 +492,8 @@ static int vfio_pci_core_pm_exit(struct vfio_pci_core_device vdev, u32 flags, } #ifdef CONFIG_PM -static int vfio_pci_core_runtime_suspend(struct device dev) +int vfio_pci_core_runtime_suspend(struct vfio_pci_core_device vdev) { - struct vfio_pci_core_device vdev = dev_get_drvdata(dev); - down_write(&vdev->memory_lock); / * The user can move the device into D3hot state before invoking @@ -516,11 +518,10 @@ static int vfio_pci_core_runtime_suspend(struct device dev) return 0; } +EXPORT_SYMBOL_GPL(vfio_pci_core_runtime_suspend); -static int vfio_pci_core_runtime_resume(struct device dev) +int vfio_pci_core_runtime_resume(struct vfio_pci_core_device vdev) { - struct vfio_pci_core_device vdev = dev_get_drvdata(dev); - /* * Resume with a pm_wake_eventfd_ctx signals the eventfd and exit * low power mode. @@ -537,6 +538,7 @@ static int vfio_pci_core_runtime_resume(struct device dev) return 0; } +EXPORT_SYMBOL_GPL(vfio_pci_core_runtime_resume); #endif / CONFIG_PM / / @@ -576,18 +578,6 @@ static void vfio_pci_core_map_bars(struct vfio_pci_core_device vdev) } } -/ - * The pci-driver core runtime PM routines always save the device state - * before going into suspended state. If the device is going into low power - * state with only with runtime PM ops, then no explicit handling is needed - * for the devices which have NoSoftRst-. - / -static const struct dev_pm_ops vfio_pci_core_pm_ops = { - SET_RUNTIME_PM_OPS(vfio_pci_core_runtime_suspend, - vfio_pci_core_runtime_resume, - NULL) -}; - int vfio_pci_core_enable(struct vfio_pci_core_device vdev) { struct pci_dev pdev = vdev->pdev; @@ -2149,20 +2139,27 @@ static void vfio_pci_vf_uninit(struct vfio_pci_core_device vdev) static int vfio_pci_vga_init(struct vfio_pci_core_device vdev) { + unsigned int (set_decode)(struct pci_dev pdev, bool single_vga); struct pci_dev pdev = vdev->pdev; int ret; if (!vfio_pci_is_vga(pdev)) return 0; + /* VGA access is fixed for the lifetime of this registration. / + if (vfio_vga_disabled(vdev)) + set_decode = vfio_pci_vga_decode_novga; + else + set_decode = vfio_pci_vga_decode_all; + ret = aperture_remove_conflicting_pci_devices(pdev, vdev->vdev.ops->name); if (ret) return ret; - ret = vga_client_register(pdev, vfio_pci_set_decode); + ret = vga_client_register(pdev, set_decode); if (ret) return ret; - vga_set_legacy_decoding(pdev, vfio_pci_set_decode(pdev, false)); + vga_set_legacy_decoding(pdev, set_decode(pdev, false)); return 0; } @@ -2221,10 +2218,6 @@ int vfio_pci_core_register_device(struct vfio_pci_core_device vdev) struct device dev = &pdev->dev; int ret; - / Drivers must set the vfio_pci_core_device to their drvdata / - if (WARN_ON(vdev != dev_get_drvdata(dev))) - return -EINVAL; - / Drivers must set a name. Required for sequestering SR-IOV VFs / if (WARN_ON(!vdev->vdev.ops->name)) return -EINVAL; @@ -2292,7 +2285,6 @@ int vfio_pci_core_register_device(struct vfio_pci_core_device vdev) / vfio_pci_set_power_state(vdev, PCI_D0); - dev->driver->pm = &vfio_pci_core_pm_ops; pm_runtime_allow(dev); if (!vdev->disable_idle_d3) pm_runtime_put(dev); @@ -2333,10 +2325,9 @@ void vfio_pci_core_unregister_device(struct vfio_pci_core_device vdev) } EXPORT_SYMBOL_GPL(vfio_pci_core_unregister_device); -pci_ers_result_t vfio_pci_core_aer_err_detected(struct pci_dev pdev, +pci_ers_result_t vfio_pci_core_aer_err_detected(struct vfio_pci_core_device vdev, pci_channel_state_t state) { - struct vfio_pci_core_device vdev = dev_get_drvdata(&pdev->dev); struct vfio_pci_eventfd eventfd; rcu_read_lock(); @@ -2419,11 +2410,6 @@ int vfio_pci_core_sriov_configure(struct vfio_pci_core_device vdev, } EXPORT_SYMBOL_GPL(vfio_pci_core_sriov_configure); -const struct pci_error_handlers vfio_pci_core_err_handlers = { - .error_detected = vfio_pci_core_aer_err_detected, -}; -EXPORT_SYMBOL_GPL(vfio_pci_core_err_handlers); - static bool vfio_dev_in_groups(struct vfio_device vdev, struct vfio_pci_group_info groups) { diff --git a/drivers/vfio/pci/virtio/main.c b/drivers/vfio/pci/virtio/main.c index d2e5cbca13c85..69c2bf864aa7d 100644 --- a/drivers/vfio/pci/virtio/main.c +++ b/drivers/vfio/pci/virtio/main.c @@ -18,6 +18,9 @@ #include "common.h" +VFIO_PCI_CORE_DEFINE_CALLBACKS(virtiovf, struct virtiovf_pci_core_device, + core_device) + static int virtiovf_pci_open_device(struct vfio_device core_vdev) { struct virtiovf_pci_core_device virtvdev = container_of(core_vdev, @@ -174,7 +177,7 @@ static int virtiovf_pci_probe(struct pci_dev pdev, if (sup_lm) virtiovf_set_migratable(virtvdev); - dev_set_drvdata(&pdev->dev, &virtvdev->core_device); + dev_set_drvdata(&pdev->dev, virtvdev); ret = vfio_pci_core_register_device(&virtvdev->core_device); if (ret) goto out; @@ -211,7 +214,7 @@ static void virtiovf_pci_aer_reset_done(struct pci_dev pdev) static const struct pci_error_handlers virtiovf_err_handlers = { .reset_done = virtiovf_pci_aer_reset_done, - .error_detected = vfio_pci_core_aer_err_detected, + .error_detected = virtiovf_aer_err_detected, }; static struct pci_driver virtiovf_pci_driver = { @@ -219,6 +222,7 @@ static struct pci_driver virtiovf_pci_driver = { .id_table = virtiovf_pci_table, .probe = virtiovf_pci_probe, .remove = virtiovf_pci_remove, + .driver = { .pm = &virtiovf_pm_ops }, .err_handler = &virtiovf_err_handlers, .driver_managed_dma = true, }; diff --git a/drivers/vfio/pci/xe/main.c b/drivers/vfio/pci/xe/main.c index cbff5af385ef5..18a87ac68841a 100644 --- a/drivers/vfio/pci/xe/main.c +++ b/drivers/vfio/pci/xe/main.c @@ -38,6 +38,9 @@ struct xe_vfio_pci_core_device { struct xe_vfio_pci_migration_file migf; }; +VFIO_PCI_CORE_DEFINE_CALLBACKS(xe_vfio, struct xe_vfio_pci_core_device, + core_device) + #define xe_vdev_to_dev(xe_vdev) (&(xe_vdev)->core_device.pdev->dev) static void xe_vfio_pci_disable_file(struct xe_vfio_pci_migration_file migf) @@ -140,7 +143,7 @@ static void xe_vfio_pci_reset_done(struct pci_dev pdev) static const struct pci_error_handlers xe_vfio_pci_err_handlers = { .reset_prepare = xe_vfio_pci_reset_prepare, .reset_done = xe_vfio_pci_reset_done, - .error_detected = vfio_pci_core_aer_err_detected, + .error_detected = xe_vfio_aer_err_detected, }; static int xe_vfio_pci_open_device(struct vfio_device core_vdev) @@ -550,7 +553,7 @@ static int xe_vfio_pci_probe(struct pci_dev pdev, const struct pci_device_id i if (IS_ERR(xe_vdev)) return PTR_ERR(xe_vdev); - dev_set_drvdata(&pdev->dev, &xe_vdev->core_device); + dev_set_drvdata(&pdev->dev, xe_vdev); ret = vfio_pci_core_register_device(&xe_vdev->core_device); if (ret) { @@ -586,6 +589,7 @@ static struct pci_driver xe_vfio_pci_driver = { .id_table = xe_vfio_pci_table, .probe = xe_vfio_pci_probe, .remove = xe_vfio_pci_remove, + .driver = { .pm = &xe_vfio_pm_ops }, .err_handler = &xe_vfio_pci_err_handlers, .driver_managed_dma = true, }; diff --git a/include/linux/vfio_pci_core.h b/include/linux/vfio_pci_core.h index 9a1674c152aa2..a7286100c4f92 100644 --- a/include/linux/vfio_pci_core.h +++ b/include/linux/vfio_pci_core.h @@ -8,6 +8,7 @@ Author: Tom Lyon, pugs@cisco.com / +#include <linux/device.h> #include <linux/mutex.h> #include <linux/pci.h> #include <linux/vfio.h> @@ -16,6 +17,7 @@ #include <linux/types.h> #include <linux/uuid.h> #include <linux/notifier.h> +#include <linux/pm.h> #ifndef VFIO_PCI_CORE_H #define VFIO_PCI_CORE_H @@ -168,7 +170,6 @@ int vfio_pci_core_init_dev(struct vfio_device core_vdev); void vfio_pci_core_release_dev(struct vfio_device core_vdev); int vfio_pci_core_register_device(struct vfio_pci_core_device vdev); void vfio_pci_core_unregister_device(struct vfio_pci_core_device vdev); -extern const struct pci_error_handlers vfio_pci_core_err_handlers; int vfio_pci_core_sriov_configure(struct vfio_pci_core_device vdev, int nr_virtfn); long vfio_pci_core_ioctl(struct vfio_device core_vdev, unsigned int cmd, @@ -193,8 +194,6 @@ int vfio_pci_core_match_token_uuid(struct vfio_device core_vdev, int vfio_pci_core_enable(struct vfio_pci_core_device vdev); void vfio_pci_core_disable(struct vfio_pci_core_device vdev); void vfio_pci_core_finish_enable(struct vfio_pci_core_device vdev); -pci_ers_result_t vfio_pci_core_aer_err_detected(struct pci_dev pdev, - pci_channel_state_t state); ssize_t vfio_pci_core_do_io_rw(struct vfio_pci_core_device vdev, bool test_mem, void __iomem io, char __user buf, loff_t off, size_t count, size_t x_start, @@ -260,4 +259,41 @@ vfio_pci_core_get_iomap(struct vfio_pci_core_device vdev, unsigned int bar) int vfio_pci_dma_buf_iommufd_map(struct dma_buf_attachment attachment, struct phys_vec phys); +int vfio_pci_core_runtime_suspend(struct vfio_pci_core_device vdev); +int vfio_pci_core_runtime_resume(struct vfio_pci_core_device vdev); +pci_ers_result_t vfio_pci_core_aer_err_detected(struct vfio_pci_core_device vdev, + pci_channel_state_t state); + +/ + * Per-driver PM/AER trampolines. driver_data points to the driver's private + * structure, which embeds a struct vfio_pci_core_device. + * + * @name: prefix for <name>_pm_ops and <name>_aer_err_detected + * @drv_type: type of the driver's private structure, including struct + * @member: member containing the struct vfio_pci_core_device + / +#define VFIO_PCI_CORE_DEFINE_CALLBACKS(name, drv_type, member) \ +static int __maybe_unused name##_pm_suspend(struct device dev) \ +{ \ + drv_type drvdata = dev_get_drvdata(dev); \ + \ + return vfio_pci_core_runtime_suspend(&drvdata->member); \ +} \ +static int __maybe_unused name##_pm_resume(struct device dev) \ +{ \ + drv_type drvdata = dev_get_drvdata(dev); \ + \ + return vfio_pci_core_runtime_resume(&drvdata->member); \ +} \ +static const struct dev_pm_ops name##_pm_ops = { \ + SET_RUNTIME_PM_OPS(name##_pm_suspend, name##_pm_resume, NULL) \ +}; \ +static pci_ers_result_t name##_aer_err_detected(struct pci_dev pdev, \ + pci_channel_state_t state) \ +{ \ + drv_type drvdata = pci_get_drvdata(pdev); \ + \ + return vfio_pci_core_aer_err_detected(&drvdata->member, state); \ +} + #endif / VFIO_PCI_CORE_H */
3/2	2026/10/01 15:23	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 15006 output: 25 thoughts: 286 Thoughts: Analyzing This VFIO Patch Okay, let's dive into this patch. My immediate thought is, "Right, let's break this down." First, I need to understand the scope and the core issue it's addressing. The initial inspection of the touched files gives me a good starting point: `drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c`, `drivers/vfio/pci/ism/main.c`, `drivers/vfio/pci/mlx5/main.c`, `drivers/vfio/pci/nvgrace-gpu/main.c`, `drivers/vfio/pci/pds/pci_drv.c`, `drivers/vfio/pci/pds/vfio_dev.c`, `drivers/vfio/pci/qat/main.c`, `drivers/vfio/pci/vfio_pci.c`, `drivers/vfio/pci/vfio_pci_core.c`, `drivers/vfio/pci/virtio/main.c`, `drivers/vfio/pci/xe/main.c`, and `include/linux/vfio_pci_core.h`. That's a broad range of VFIO PCI drivers, along with the core VFIO PCI code and an include file. That screams a potentially significant change to the VFIO PCI infrastructure itself, or maybe a fix that's affecting numerous drivers. Now, my next step is clear: I need context. I'll need to use `git log` to get the commit message and understand the author's rationale and intentions for this change. If the commit message is sparse (which is, unfortunately, common), I'll immediately start grepping the code for related context and clues. This will help me quickly understand why this change was made and what it's trying to accomplish. Ultimately, I need to get into the head of the developers who wrote this, understand their reasoning, and map that back to the specific changes. This initial investigation will help narrow my focus for the detailed code review.
4/2	2026/10/01 15:23	tool	grepper	0m Args: { "Expression": "VFIO_PCI_CORE_DEFINE_CALLBACKS" } Results: { "Output": "drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c-18-\ndrivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c:19:VFIO_PCI_CORE_DEFINE_CALLBACKS(hisi_acc_vf, struct hisi_acc_vf_core_device,\ndrivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c-20-\t\t\t core_device)\n--\ndrivers/vfio/pci/ism/main.c=45=struct ism_vfio_pci_core_device {\n--\ndrivers/vfio/pci/ism/main.c-49-\ndrivers/vfio/pci/ism/main.c:50:VFIO_PCI_CORE_DEFINE_CALLBACKS(ism_vfio, struct ism_vfio_pci_core_device,\ndrivers/vfio/pci/ism/main.c-51-\t\t\t core_device)\n--\ndrivers/vfio/pci/mlx5/main.c-23-\ndrivers/vfio/pci/mlx5/main.c:24:VFIO_PCI_CORE_DEFINE_CALLBACKS(mlx5vf, struct mlx5vf_pci_core_device,\ndrivers/vfio/pci/mlx5/main.c-25-\t\t\t core_device)\n--\ndrivers/vfio/pci/nvgrace-gpu/main.c=60=struct nvgrace_gpu_pci_core_device {\n--\ndrivers/vfio/pci/nvgrace-gpu/main.c-75-\ndrivers/vfio/pci/nvgrace-gpu/main.c:76:VFIO_PCI_CORE_DEFINE_CALLBACKS(nvgrace_gpu, struct nvgrace_gpu_pci_core_device,\ndrivers/vfio/pci/nvgrace-gpu/main.c-77-\t\t\t core_device)\n--\ndrivers/vfio/pci/pds/pci_drv.c-18-\ndrivers/vfio/pci/pds/pci_drv.c:19:VFIO_PCI_CORE_DEFINE_CALLBACKS(pds_vfio, struct pds_vfio_pci_device,\ndrivers/vfio/pci/pds/pci_drv.c-20-\t\t\t vfio_coredev)\n--\ndrivers/vfio/pci/qat/main.c=48=struct qat_vf_core_device {\n--\ndrivers/vfio/pci/qat/main.c-57-\ndrivers/vfio/pci/qat/main.c:58:VFIO_PCI_CORE_DEFINE_CALLBACKS(qat_vf, struct qat_vf_core_device,\ndrivers/vfio/pci/qat/main.c-59-\t\t\t core_device)\n--\ndrivers/vfio/pci/virtio/main.c-20-\ndrivers/vfio/pci/virtio/main.c:21:VFIO_PCI_CORE_DEFINE_CALLBACKS(virtiovf, struct virtiovf_pci_core_device,\ndrivers/vfio/pci/virtio/main.c-22-\t\t\t core_device)\n--\ndrivers/vfio/pci/xe/main.c=27=struct xe_vfio_pci_core_device {\n--\ndrivers/vfio/pci/xe/main.c-40-\ndrivers/vfio/pci/xe/main.c:41:VFIO_PCI_CORE_DEFINE_CALLBACKS(xe_vfio, struct xe_vfio_pci_core_device,\ndrivers/vfio/pci/xe/main.c-42-\t\t\t core_device)\n--\ninclude/linux/vfio_pci_core.h=264=pci_ers_result_t vfio_pci_core_aer_err_detected(struct vfio_pci_core_device vdev,\n--\ninclude/linux/vfio_pci_core.h-274- /\ninclude/linux/vfio_pci_core.h:275:#define VFIO_PCI_CORE_DEFINE_CALLBACKS(name, drv_type, member) \\\ninclude/linux/vfio_pci_core.h-276-static int __maybe_unused name##_pm_suspend(struct device *dev) \\\n" }
5/2	2026/10/01 15:23	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 16878 output: 43 thoughts: 1974 Thoughts: Analyzing the VFIO PCI Core Patch for Fuzzability Okay, let's break this down. First, I need to understand the change. It looks like the patch is refactoring how the VFIO PCI core interacts with driver data and callbacks. Previously, the core was dynamically overwriting the driver's power management (`pm`) ops and relying on `dev_get_drvdata` to retrieve the `vfio_pci_core_device` from the driver's `drvdata`. This had some limitations. Drivers embedding the core device had to jump through hoops with `dev_set_drvdata` and `container_of`, and it prevented drivers from storing their own data structures directly in `drvdata`. Furthermore, dynamically overwriting `dev->driver->pm` was not a good practice, as `dev->driver` is shared across all devices of the driver. The fix introduces `VFIO_PCI_CORE_DEFINE_CALLBACKS`, which defines static, driver-specific PM ops and AER callbacks. It's setting `dev->driver.pm` statically in the `pci_driver` struct, and setting the driver's data using `dev_set_drvdata`. This cleans up the code and provides a more straightforward way for drivers to integrate with the VFIO PCI core. Now, the crucial question: is this fuzzable? I have to go through the guidelines. Reachability is the primary gate. I need to figure out which drivers are affected. It looks like this change touches a variety of VFIO PCI drivers: Hisilicon, IBM ISM, Mellanox, NVIDIA Grace, Pensando, Intel QAT, and Intel Xe GPU. Those are all hardware-specific drivers, right? They're not emulated in standard QEMU. That's a red flag. The guideline says that code that requires physical hardware not emulated in standard QEMU is not worth fuzzing. I have to think about the guideline. The guideline says "structurally unreachable hardware". Wait! There's also the Virtio VFIO PCI driver that is touched. That's a possibility! Can `vfio-pci` be bound to devices in QEMU? And what about `vfio_pci.c` and `vfio_pci_core.c`? What is the reachability of this? So, can Syzkaller fuzz vfio-pci? Let me check quickly if syzkaller has pseudo-syscalls or support for vfio. No, I need to check what devices exist. Let me try a search. Okay, I have to remember that this tool can't search for pseudo-syscalls. So no. Can vfio-pci bind to emulated PCI devices in QEMU? I need to check how vfio-pci works to decide. Let me investigate `vfio_pci.c`. The `vfio_pci_table` is a good place to start. I need to read `drivers/vfio/pci/vfio_pci.c`. Okay, I need to carefully consider if this refactoring impacts code that's reachable and fuzzable.
6/2	2026/10/01 15:23	tool	read-file	0m Args: { "File": "drivers/vfio/pci/vfio_pci.c", "FirstLine": 210, "LineCount": 40 } Results: { "Contents": " 210:\t{\n 211:\t\tstruct vfio_pci_core_device vdev = dev_get_drvdata(\u0026pdev-\u003edev);\n 212:\t\n 213:\t\tif (!enable_sriov)\n 214:\t\t\treturn -ENOENT;\n 215:\t\n 216:\t\treturn vfio_pci_core_sriov_configure(vdev, nr_virtfn);\n 217:\t}\n 218:\t\n 219:\tstatic const struct pci_device_id vfio_pci_table[] = {\n 220:\t\t{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_ANY_ID, PCI_ANY_ID) }, / match all by default /\n 221:\t\t{}\n 222:\t};\n 223:\t\n 224:\tMODULE_DEVICE_TABLE(pci, vfio_pci_table);\n 225:\t\n 226:\tstatic int __maybe_unused vfio_pci_pm_suspend(struct device dev)\n 227:\t{\n 228:\t\tstruct vfio_pci_core_device vdev = dev_get_drvdata(dev);\n 229:\t\n 230:\t\treturn vfio_pci_core_runtime_suspend(vdev);\n 231:\t}\n 232:\t\n 233:\tstatic int __maybe_unused vfio_pci_pm_resume(struct device dev)\n 234:\t{\n 235:\t\tstruct vfio_pci_core_device vdev = dev_get_drvdata(dev);\n 236:\t\n 237:\t\treturn vfio_pci_core_runtime_resume(vdev);\n 238:\t}\n 239:\t\n 240:\tstatic const struct dev_pm_ops vfio_pci_pm_ops = {\n 241:\t\tSET_RUNTIME_PM_OPS(vfio_pci_pm_suspend, vfio_pci_pm_resume, NULL)\n 242:\t};\n 243:\t\n 244:\tstatic pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev pdev,\n 245:\t\t\t\t\t\t pci_channel_state_t state)\n 246:\t{\n 247:\t\tstruct vfio_pci_core_device *vdev = pci_get_drvdata(pdev);\n 248:\t\n 249:\t\treturn vfio_pci_core_aer_err_detected(vdev, state);\n" }
7/2	2026/10/01 15:23	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 20259 output: 26 thoughts: 99 Thoughts: Investigating vfio-pci Binding Alright, let's dive into this. My initial glance at `PCI_DRIVER_OVERRIDE_DEVICE_VFIO` has me puzzled. The `vfio_pci_table` shows this generic entry: `{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_ANY_ID, PCI_ANY_ID) }`. Hold on a second, that's throwing me for a loop. How exactly does a PCI device ever end up getting bound to the `vfio-pci` driver with that kind of wildcard setup? It's not immediately obvious, and that has to be investigated. I need to get a deeper understanding here. Let's fire up a kernel tree search and see what other code utilizes `PCI_DRIVER_OVERRIDE_DEVICE_VFIO`. Hopefully that sheds some light on the device binding process.
8/2	2026/10/01 15:23	tool	grepper	0m Args: { "Expression": "PCI_DRIVER_OVERRIDE_DEVICE_VFIO" } Results: { "Output": "drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c=1708=static const struct pci_device_id hisi_acc_vfio_pci_table[] = {\ndrivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c:1709:\t{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_HUAWEI, PCI_DEVICE_ID_HUAWEI_SEC_VF) },\ndrivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c:1710:\t{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_HUAWEI, PCI_DEVICE_ID_HUAWEI_HPRE_VF) },\ndrivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c:1711:\t{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_HUAWEI, PCI_DEVICE_ID_HUAWEI_ZIP_VF) },\ndrivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c-1712-\t{ }\n--\ndrivers/vfio/pci/ism/main.c=386=static const struct pci_device_id ism_device_table[] = {\ndrivers/vfio/pci/ism/main.c:387:\t{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_IBM,\ndrivers/vfio/pci/ism/main.c-388-\t\t\t\t\t PCI_DEVICE_ID_IBM_ISM) },\n--\ndrivers/vfio/pci/mlx5/main.c=1437=static const struct pci_device_id mlx5vf_pci_table[] = {\ndrivers/vfio/pci/mlx5/main.c:1438:\t{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_MELLANOX, 0x101e) }, /* ConnectX Family mlx5Gen Virtual Function /\ndrivers/vfio/pci/mlx5/main.c-1439-\t{}\n--\ndrivers/vfio/pci/nvgrace-gpu/main.c=1384=static const struct pci_device_id nvgrace_gpu_vfio_pci_table[] = {\ndrivers/vfio/pci/nvgrace-gpu/main.c-1385-\t/ GH200 120GB /\ndrivers/vfio/pci/nvgrace-gpu/main.c:1386:\t{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_NVIDIA, 0x2342) },\ndrivers/vfio/pci/nvgrace-gpu/main.c-1387-\t/ GH200 480GB /\ndrivers/vfio/pci/nvgrace-gpu/main.c:1388:\t{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_NVIDIA, 0x2345) },\ndrivers/vfio/pci/nvgrace-gpu/main.c-1389-\t/ GH200 SKU /\ndrivers/vfio/pci/nvgrace-gpu/main.c:1390:\t{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_NVIDIA, 0x2348) },\ndrivers/vfio/pci/nvgrace-gpu/main.c-1391-\t/ GB200 SKU /\ndrivers/vfio/pci/nvgrace-gpu/main.c:1392:\t{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_NVIDIA, 0x2941) },\ndrivers/vfio/pci/nvgrace-gpu/main.c-1393-\t/ GB300 SKU /\ndrivers/vfio/pci/nvgrace-gpu/main.c:1394:\t{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_NVIDIA, 0x31C2) },\ndrivers/vfio/pci/nvgrace-gpu/main.c-1395-\t{}\n--\ndrivers/vfio/pci/pds/pci_drv.c=162=static const struct pci_device_id pds_vfio_pci_table[] = {\ndrivers/vfio/pci/pds/pci_drv.c:163:\t{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_PENSANDO, 0x1003) }, / Ethernet VF /\ndrivers/vfio/pci/pds/pci_drv.c-164-\t{ 0, }\n--\ndrivers/vfio/pci/qat/main.c=675=static const struct pci_device_id qat_vf_vfio_pci_table[] = {\ndrivers/vfio/pci/qat/main.c-676-\t/ Intel QAT GEN4 4xxx VF device /\ndrivers/vfio/pci/qat/main.c:677:\t{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_INTEL, 0x4941) },\ndrivers/vfio/pci/qat/main.c:678:\t{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_INTEL, 0x4943) },\ndrivers/vfio/pci/qat/main.c:679:\t{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_INTEL, 0x4945) },\ndrivers/vfio/pci/qat/main.c-680-\t/ Intel QAT GEN5 420xx VF device /\ndrivers/vfio/pci/qat/main.c:681:\t{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_INTEL, 0x4947) },\ndrivers/vfio/pci/qat/main.c-682-\t/ Intel QAT GEN6 6xxx VF device /\ndrivers/vfio/pci/qat/main.c:683:\t{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_INTEL, 0x4949) },\ndrivers/vfio/pci/qat/main.c-684-\t{}\n--\ndrivers/vfio/pci/vfio_pci.c=219=static const struct pci_device_id vfio_pci_table[] = {\ndrivers/vfio/pci/vfio_pci.c:220:\t{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_ANY_ID, PCI_ANY_ID) }, / match all by default /\ndrivers/vfio/pci/vfio_pci.c-221-\t{}\n--\ndrivers/vfio/pci/virtio/main.c=198=static const struct pci_device_id virtiovf_pci_table[] = {\ndrivers/vfio/pci/virtio/main.c-199-\t/ Only virtio-net and virtio-block are supported/tested so far /\ndrivers/vfio/pci/virtio/main.c:200:\t{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_REDHAT_QUMRANET, 0x1041) },\ndrivers/vfio/pci/virtio/main.c:201:\t{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_REDHAT_QUMRANET, 0x1042) },\ndrivers/vfio/pci/virtio/main.c-202-\t{}\n--\ndrivers/vfio/pci/xe/main.c=567=static void xe_vfio_pci_remove(struct pci_dev pdev)\n--\ndrivers/vfio/pci/xe/main.c-575-#define INTEL_PCI_VFIO_DEVICE(_id) { \\\ndrivers/vfio/pci/xe/main.c:576:\tPCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_INTEL, (_id)) \\\ndrivers/vfio/pci/xe/main.c-577-}\n--\ninclude/linux/pci.h=1029=struct pci_driver {\n--\ninclude/linux/pci.h-1079-/*\ninclude/linux/pci.h:1080: PCI_DRIVER_OVERRIDE_DEVICE_VFIO - macro used to describe a VFIO\ninclude/linux/pci.h-1081- * \"driver_override\" PCI device.\n--\ninclude/linux/pci.h-1089- */\ninclude/linux/pci.h:1090:#define PCI_DRIVER_OVERRIDE_DEVICE_VFIO(vend, dev) \\\ninclude/linux/pci.h-1091-\tPCI_DEVICE_DRIVER_OVERRIDE(vend, dev, PCI_ID_F_VFIO_DRIVER_OVERRIDE)\n" }
9/2	2026/10/01 15:23	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 22893 output: 37 thoughts: 64 Thoughts: Okay, here's my interpretation of this thought process, keeping in mind my expertise: Diving into PCI Driver Overrides for VFIO Right, so the system flagged `PCI_DRIVER_OVERRIDE_DEVICE_VFIO` – that's a key setting in the PCI driver world. Time to refresh my memory and understand what's really happening here. My first thought is to dig into the heart of the matter. Let's quickly get the details: I need to consult the definitive source. I'm heading straight to `include/linux/pci.h`. Now, I want to look specifically at the definitions and context around `PCI_DRIVER_OVERRIDE_DEVICE_VFIO`. I'll focus on lines 1075 through 1100. That's the likely section where I'll find the relevant macro definition and hopefully some helpful inline comments explaining its implications within the driver framework. I'm expecting to find insights into how device assignment interacts with the VFIO subsystem and how this override alters the typical device binding.
10/2	2026/10/01 15:24	tool	read-file	0m Args: { "File": "include/linux/pci.h", "FirstLine": 1075, "LineCount": 30 } Results: { "Contents": "1075:\t#define PCI_DEVICE_DRIVER_OVERRIDE(vend, dev, driver_override) \\\n1076:\t\t.vendor = (vend), .device = (dev), .subvendor = PCI_ANY_ID, \\\n1077:\t\t.subdevice = PCI_ANY_ID, .override_only = (driver_override)\n1078:\t\n1079:\t/*\n1080:\t PCI_DRIVER_OVERRIDE_DEVICE_VFIO - macro used to describe a VFIO\n1081:\t * \"driver_override\" PCI device.\n1082:\t * @vend: the 16 bit PCI Vendor ID\n1083:\t * @dev: the 16 bit PCI Device ID\n1084:\t \n1085:\t This macro is used to create a struct pci_device_id that matches a\n1086:\t * specific device. The subvendor and subdevice fields will be set to\n1087:\t * PCI_ANY_ID and the driver_override will be set to\n1088:\t * PCI_ID_F_VFIO_DRIVER_OVERRIDE.\n1089:\t /\n1090:\t#define PCI_DRIVER_OVERRIDE_DEVICE_VFIO(vend, dev) \\\n1091:\t\tPCI_DEVICE_DRIVER_OVERRIDE(vend, dev, PCI_ID_F_VFIO_DRIVER_OVERRIDE)\n1092:\t\n1093:\t/\n1094:\t PCI_DEVICE_SUB - macro used to describe a specific PCI device with subsystem\n1095:\t * @vend: the 16 bit PCI Vendor ID\n1096:\t * @dev: the 16 bit PCI Device ID\n1097:\t * @subvend: the 16 bit PCI Subvendor ID\n1098:\t * @subdev: the 16 bit PCI Subdevice ID\n1099:\t \n1100:\t This macro is used to create a struct pci_device_id that matches a\n1101:\t * specific device with subsystem information.\n1102:\t */\n1103:\t#define PCI_DEVICE_SUB(vend, dev, subvend, subdev) \\\n1104:\t\t.vendor = (vend), .device = (dev), \\\n" }
11/2	2026/10/01 15:24	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 23809 output: 28 thoughts: 50 Thoughts: Okay, here's my interpretation of those thoughts, tailored for an expert audience, presented in the first person: Diving into VFIO Driver Override Behavior Alright, my immediate thought is to zero in on `PCI_ID_F_VFIO_DRIVER_OVERRIDE`. This flag is crucial; it's a key piece of the VFIO driver matching puzzle, so let's dig deeper to see how it's actually used. We need to dissect exactly how the driver matching logic interacts with this specific flag. So, I'm going to start by grepping the codebase for every instance of `PCI_ID_F_VFIO_DRIVER_OVERRIDE`. That's the best way to trace the execution flow and understand the conditions under which the driver matching decision is made. I'm looking for the code that actually leverages this, not just where it's defined, but where it influences the selection of a VFIO driver versus a host driver. This should illuminate the override behavior.
12/2	2026/10/01 15:24	tool	grepper	0m Args: { "Expression": "PCI_ID_F_VFIO_DRIVER_OVERRIDE" } Results: { "Output": "include/linux/device-id/pci.h=12=enum {\ninclude/linux/device-id/pci.h:13:\tPCI_ID_F_VFIO_DRIVER_OVERRIDE = 1,\ninclude/linux/device-id/pci.h-14-};\n--\ninclude/linux/pci.h=1029=struct pci_driver {\n--\ninclude/linux/pci.h-1087- * PCI_ANY_ID and the driver_override will be set to\ninclude/linux/pci.h:1088: * PCI_ID_F_VFIO_DRIVER_OVERRIDE.\ninclude/linux/pci.h-1089- /\ninclude/linux/pci.h-1090-#define PCI_DRIVER_OVERRIDE_DEVICE_VFIO(vend, dev) \\\ninclude/linux/pci.h:1091:\tPCI_DEVICE_DRIVER_OVERRIDE(vend, dev, PCI_ID_F_VFIO_DRIVER_OVERRIDE)\ninclude/linux/pci.h-1092-\n--\nscripts/mod/file2alias.c=421=static void do_pci_entry(struct module mod, void *symval)\n--\nscripts/mod/file2alias.c-439-\t\tbreak;\nscripts/mod/file2alias.c:440:\tcase PCI_ID_F_VFIO_DRIVER_OVERRIDE:\nscripts/mod/file2alias.c-441-\t\tstrcpy(alias, \"vfio_pci:\");\n" }
13/2	2026/10/01 15:24	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 24495 output: 17 thoughts: 13 Thoughts: Here's my take on those thoughts, tailored for an expert audience: Analyzing the `override_only` Condition Okay, so I need to understand the impact of the `override_only` flag. My first step is to trace exactly where in the codebase this variable is checked and what logic hinges on its value. I'm thinking I'll start with a straightforward text search within the project, looking for instances of that term. This will quickly reveal all the control flow points directly related to `override_only`. I'm going to look for comparisons, assignments, or any functions that might be evaluating or manipulating that variable, and hopefully I will find the various locations where this variable is used. This should give me a solid picture of its influence on the system's behavior.
14/2	2026/10/01 15:24	tool	grepper	0m Args: { "Expression": "override_only" } Results: { "Output": "Documentation/PCI/pci.rst=101=need pass only as many optional fields as necessary:\n--\nDocumentation/PCI/pci.rst-105- - driver_data defaults to 0UL.\nDocumentation/PCI/pci.rst:106: - override_only field defaults to 0.\nDocumentation/PCI/pci.rst-107-\n--\nDocumentation/translations/zh_CN/PCI/pci.rst=99=pci_device_id表。\n--\nDocumentation/translations/zh_CN/PCI/pci.rst-111- - driver_data默认为0UL。\nDocumentation/translations/zh_CN/PCI/pci.rst:112: - override_only字段默认为0。\nDocumentation/translations/zh_CN/PCI/pci.rst-113-\n--\ndrivers/cdx/cdx.c=263=static int cdx_bus_match(struct device dev, const struct device_driver drv)\n--\ndrivers/cdx/cdx.c-286-\t\t/\ndrivers/cdx/cdx.c:287:\t\t In case override_only was set, enforce driver_override\ndrivers/cdx/cdx.c-288-\t\t * matching.\ndrivers/cdx/cdx.c-289-\t\t /\ndrivers/cdx/cdx.c:290:\t\tif (!found_id-\u003eoverride_only)\ndrivers/cdx/cdx.c-291-\t\t\treturn true;\n--\ndrivers/pci/pci-driver.c=114=static void pci_free_dynids(struct pci_driver drv)\n--\ndrivers/pci/pci-driver.c-129- * @dev_id: the actual PCI device ID structure to match against.\ndrivers/pci/pci-driver.c:130: * @include_override_only: also match against device ID entries marked as\ndrivers/pci/pci-driver.c-131- * override only.\n--\ndrivers/pci/pci-driver.c=136=do_pci_match_id(const struct pci_device_id ids,\ndrivers/pci/pci-driver.c-137-\t\tconst struct pci_device_id dev_id,\ndrivers/pci/pci-driver.c:138:\t\tbool include_override_only)\ndrivers/pci/pci-driver.c-139-{\n--\ndrivers/pci/pci-driver.c-141-\t\twhile (ids-\u003evendor \|\| ids-\u003esubvendor \|\| ids-\u003eclass_mask) {\ndrivers/pci/pci-driver.c:142:\t\t\tif ((!ids-\u003eoverride_only \|\| include_override_only) \u0026\u0026\ndrivers/pci/pci-driver.c-143-\t\t\t pci_match_one_id(ids, dev_id))\n--\ninclude/linux/cdx/cdx_bus.h=52=typedef int (cdx_dev_configure_cb)(struct cdx_controller cdx,\n--\ninclude/linux/cdx/cdx_bus.h-70- * CDX_DEVICE_DRIVER_OVERRIDE - macro used to describe a CDX device with\ninclude/linux/cdx/cdx_bus.h:71: * override_only flags.\ninclude/linux/cdx/cdx_bus.h-72- * @vend: the 16 bit CDX Vendor ID\ninclude/linux/cdx/cdx_bus.h-73- * @dev: the 16 bit CDX Device ID\ninclude/linux/cdx/cdx_bus.h:74: * @driver_override: the 32 bit CDX Device override_only\ninclude/linux/cdx/cdx_bus.h-75- \n--\ninclude/linux/cdx/cdx_bus.h-81-\t.vendor = (vend), .device = (dev), .subvendor = CDX_ANY_ID,\\\ninclude/linux/cdx/cdx_bus.h:82:\t.subdevice = CDX_ANY_ID, .override_only = (driver_override)\ninclude/linux/cdx/cdx_bus.h-83-\n--\ninclude/linux/device-id/cdx.h=11=enum {\n--\ninclude/linux/device-id/cdx.h-24- @class_mask: Limit which sub-fields of the class field are compared.\ninclude/linux/device-id/cdx.h:25: * @override_only: Match only when dev-\u003edriver_override is this driver.\ninclude/linux/device-id/cdx.h-26- \n--\ninclude/linux/device-id/cdx.h=30=struct cdx_device_id {\n--\ninclude/linux/device-id/cdx.h-36-\t__u32 class_mask;\ninclude/linux/device-id/cdx.h:37:\t__u32 override_only;\ninclude/linux/device-id/cdx.h-38-};\n--\ninclude/linux/device-id/pci.h=12=enum {\n--\ninclude/linux/device-id/pci.h-33- \t\t\tinstead of using it as a pointer.\ninclude/linux/device-id/pci.h:34: * @override_only:\tMatch only when dev-\u003edriver_override is this driver.\ninclude/linux/device-id/pci.h-35- /\ninclude/linux/device-id/pci.h=36=struct pci_device_id {\n--\ninclude/linux/device-id/pci.h-40-\tkernel_ulong_t driver_data;\t/ Data private to the driver /\ninclude/linux/device-id/pci.h:41:\t__u32 override_only;\ninclude/linux/device-id/pci.h-42-};\n--\ninclude/linux/pci.h=1029=struct pci_driver {\n--\ninclude/linux/pci.h-1065- PCI_DEVICE_DRIVER_OVERRIDE - macro used to describe a PCI device with\ninclude/linux/pci.h:1066: * override_only flags.\ninclude/linux/pci.h-1067- * @vend: the 16 bit PCI Vendor ID\ninclude/linux/pci.h-1068- * @dev: the 16 bit PCI Device ID\ninclude/linux/pci.h:1069: * @driver_override: the 32 bit PCI Device override_only\ninclude/linux/pci.h-1070- \n--\ninclude/linux/pci.h-1076-\t.vendor = (vend), .device = (dev), .subvendor = PCI_ANY_ID, \\\ninclude/linux/pci.h:1077:\t.subdevice = PCI_ANY_ID, .override_only = (driver_override)\ninclude/linux/pci.h-1078-\n--\nrust/kernel/pci.rs=179= pub const fn from_id(vendor: Vendor, device: u32) -\u003e Self {\n--\nrust/kernel/pci.rs-187- driver_data: 0,\nrust/kernel/pci.rs:188: override_only: 0,\nrust/kernel/pci.rs-189- })\n--\nrust/kernel/pci.rs=196= pub const fn from_class(class: u32, class_mask: u32) -\u003e Self {\n--\nrust/kernel/pci.rs-204- driver_data: 0,\nrust/kernel/pci.rs:205: override_only: 0,\nrust/kernel/pci.rs-206- })\n--\nrust/kernel/pci.rs=215= pub const fn from_class_and_vendor(\n--\nrust/kernel/pci.rs-227- driver_data: 0,\nrust/kernel/pci.rs:228: override_only: 0,\nrust/kernel/pci.rs-229- })\n--\nscripts/mod/devicetable-offsets.c=10=int main(void)\n--\nscripts/mod/devicetable-offsets.c-45-\tDEVID_FIELD(pci_device_id, class_mask);\nscripts/mod/devicetable-offsets.c:46:\tDEVID_FIELD(pci_device_id, override_only);\nscripts/mod/devicetable-offsets.c-47-\n--\nscripts/mod/devicetable-offsets.c-278-\tDEVID_FIELD(cdx_device_id, class_mask);\nscripts/mod/devicetable-offsets.c:279:\tDEVID_FIELD(cdx_device_id, override_only);\nscripts/mod/devicetable-offsets.c-280-\n--\nscripts/mod/file2alias.c=421=static void do_pci_entry(struct module mod, void symval)\n--\nscripts/mod/file2alias.c-433-\tDEF_FIELD(symval, pci_device_id, class_mask);\nscripts/mod/file2alias.c:434:\tDEF_FIELD(symval, pci_device_id, override_only);\nscripts/mod/file2alias.c-435-\nscripts/mod/file2alias.c:436:\tswitch (override_only) {\nscripts/mod/file2alias.c-437-\tcase 0:\n--\nscripts/mod/file2alias.c-444-\t\twarn(\"Unknown PCI driver_override alias %08X\\n\",\nscripts/mod/file2alias.c:445:\t\t override_only);\nscripts/mod/file2alias.c-446-\t}\n--\nscripts/mod/file2alias.c=1386=static void do_cdx_entry(struct module mod, void *symval)\n--\nscripts/mod/file2alias.c-1395-\tDEF_FIELD(symval, cdx_device_id, class_mask);\nscripts/mod/file2alias.c:1396:\tDEF_FIELD(symval, cdx_device_id, override_only);\nscripts/mod/file2alias.c-1397-\nscripts/mod/file2alias.c:1398:\tswitch (override_only) {\nscripts/mod/file2alias.c-1399-\tcase 0:\n--\nscripts/mod/file2alias.c-1406-\t\twarn(\"Unknown CDX driver_override alias %08X\\n\",\nscripts/mod/file2alias.c:1407:\t\t override_only);\nscripts/mod/file2alias.c-1408-\t\treturn;\n" }
15/2	2026/10/01 15:24	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 27401 output: 23 thoughts: 977 Thoughts: Analyzing the `vfio-pci` Driver Override and Syzkaller Interactions Okay, let's break this down. The core question revolves around how a PCI device gets bound to `vfio-pci`, specifically when `override_only` is in play, meaning the match happens only if `dev->driver_override` is set to that driver. Normally, an administrator would write `vfio-pci` to `/sys/bus/pci/devices/.../driver_override` and then perform the binding. The immediate question is whether Syzkaller can do that. Is this relevant to the `vfio-pci` module? Is Syzkaller set up to do that? Hold on, let me check Section 2 of the text for more context. This section highlights "Unreachable execution paths" and "Structurally unreachable hardware," which is precisely what I was looking for. The listed unreachable execution paths include driver teardown callbacks (`.remove`, `.shutdown`, `pci_unregister_driver`) executed only during physical hot-unplug or manual sysfs driver unbinding. Also, code paths only available on non-target architectures are unreachable. The "Structurally unreachable hardware" section mentions vendor-specific PCIe switches, SmartNICs, or GPU drivers (like mlxsw, pds_core, qed, ionic, amdgpu) that require physical ASIC/PCIe cards that aren't emulated in standard QEMU. That is most likely going to be the answer, but let's review to make sure. Now, let's dive into the patch's file modifications. Here's a quick rundown of each change: 1. `drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c`: Focuses on HiSilicon Kunpeng accelerator hardware, which is physical hardware/ARM64 and not present in QEMU. The changes involve: adding `VFIO_PCI_CORE_DEFINE_CALLBACKS`, tweaks to how driver data is retrieved using `pci_get_drvdata` or `dev_get_drvdata`, modifications in the probe function with `dev_set_drvdata`, and adding error handling and PM ops. This is probably a good start. 2. `drivers/vfio/pci/ism/main.c`: Deals with IBM ISM, s390 Internal Shared Memory. Similar pattern, including `VFIO_PCI_CORE_DEFINE_CALLBACKS`, changes to `dev_set_drvdata`, `pci_get_drvdata`, PM ops and err handlers. 3. `drivers/vfio/pci/mlx5/main.c`: Mellanox ConnectX hardware, which is a physical ASIC. Identical changes in callbacks, driver data, AAR, and PM ops as above. 4. `drivers/vfio/pci/nvgrace-gpu/main.c`: Nvidia Grace GPU; again, physical hardware. 5. `drivers/vfio/pci/pds/pci_drv.c` and `vfio_dev.c`: Pensando DSC, another physical ASIC. 6. `drivers/vfio/pci/qat/main.c`: Intel QAT, another physical ASIC. 7. `drivers/vfio/pci/xe/main.c`: Intel Xe GPU, a physical ASIC. 8. `drivers/vfio/pci/virtio/main.c`: Virtio VFIO PCI driver, which is configured with `CONFIG_VIRTIO_VFIO_PCI`. Wait, what does `virtio-vfio-pci` mean? It's a key piece. Need to look more in the directory `drivers/vfio/pci/virtio/`! Essentially, the patch targets drivers for physical hardware (ASICs, GPUs, accelerators) that are not emulated in QEMU, and adds and modifies the `VFIO_PCI_CORE_DEFINE_CALLBACKS` macro. Also, it modifies how driver data is handled, using methods like `pci_get_drvdata` and `dev_get_drvdata`, and establishes error handlers and PM ops. The exception is the `virtio` path, so let's check that. This patch seems to be about adding the virtualized `vfio-pci` driver to physical hardware. Now, with the `virtio` path, this seems to be the part that needs investigation.
16/2	2026/10/01 15:24	tool	grepper	0m Args: { "Expression": "config VIRTIO_VFIO_PCI" } Results: { "Output": "drivers/vfio/pci/virtio/Kconfig-1-# SPDX-License-Identifier: GPL-2.0-only\ndrivers/vfio/pci/virtio/Kconfig:2:config VIRTIO_VFIO_PCI\ndrivers/vfio/pci/virtio/Kconfig-3-\ttristate \"VFIO support for VIRTIO PCI VF devices\"\n--\ndrivers/vfio/pci/virtio/Kconfig-18-\ndrivers/vfio/pci/virtio/Kconfig:19:config VIRTIO_VFIO_PCI_ADMIN_LEGACY\ndrivers/vfio/pci/virtio/Kconfig-20-\tbool \"Legacy I/O support for VIRTIO NET PCI VF devices\"\n" }
17/2	2026/10/01 15:24	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 29557 output: 39 thoughts: 19 Thoughts: Okay, let's dive into this. Here's my take on that Kconfig file: Analyzing the Virtio VFIO Configuration Alright, so I'm looking at `drivers/vfio/pci/virtio/Kconfig`. This is where the rubber meets the road for configuring Virtio devices under VFIO, a crucial area for any serious I/O virtualization setup. My first thought is to understand the dependencies and interactions with the broader VFIO framework. I'm immediately scanning for the `config VFIO_PCI` dependency; it’s absolutely central. We can't have Virtio under VFIO without VFIO! Next, I'm checking the specific Virtio options. I anticipate seeing settings to enable or disable different Virtio device types, like network adapters, block devices, or even newer ones like GPU passthrough. I'm keen to see if there are any specific options to control features such as DMA remapping support for Virtio devices which can impact security or performance. I'm also curious about any potential feature flags that might allow tuning for more efficient device usage. I’m also keeping an eye out for potential conflicts or interactions with other virtualization technologies or security features. Are there any conditional dependencies on other kernel features? Specifically, does this configuration file need specific CPU feature flags or other kernel configurations to function properly? If so, it might affect the portability or suitability of the kernel configuration across different platforms and hypervisors. Essentially, I'm digging for the specifics of how Virtio devices are integrated within the VFIO ecosystem, the granularity of control available to the user, and the implicit assumptions embedded within the configuration options. Knowing this helps me tune the system and address potential compatibility issues when working on this level.
18/2	2026/10/01 15:24	tool	read-file	0m Args: { "File": "drivers/vfio/pci/virtio/Kconfig", "FirstLine": 1, "LineCount": 35 } Results: { "Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0-only\n 2:\tconfig VIRTIO_VFIO_PCI\n 3:\t\ttristate \"VFIO support for VIRTIO PCI VF devices\"\n 4:\t\tdepends on VIRTIO_PCI\n 5:\t\tselect VFIO_PCI_CORE\n 6:\t\thelp\n 7:\t\t This provides migration support for VIRTIO NET and BLOCK PCI VF\n 8:\t\t devices using the VFIO framework. Migration support requires the\n 9:\t\t SR-IOV PF device to support specific VIRTIO extensions,\n 10:\t\t otherwise this driver provides no additional functionality\n 11:\t\t beyond vfio-pci.\n 12:\t\n 13:\t\t Migration support in this driver relies on dirty page tracking\n 14:\t\t provided by the IOMMU hardware and exposed through IOMMUFD, any\n 15:\t\t other use cases are dis-recommended.\n 16:\t\n 17:\t\t If you don't know what to do here, say N.\n 18:\t\n 19:\tconfig VIRTIO_VFIO_PCI_ADMIN_LEGACY\n 20:\t\tbool \"Legacy I/O support for VIRTIO NET PCI VF devices\"\n 21:\t\tdepends on VIRTIO_VFIO_PCI \u0026\u0026 VIRTIO_PCI_ADMIN_LEGACY\n 22:\t\tdefault y\n 23:\t\thelp\n 24:\t\t This extends the virtio-vfio-pci driver to support legacy I/O\n 25:\t\t access, allowing use of legacy virtio drivers with VIRTIO NET\n 26:\t\t PCI VF devices. Legacy I/O support requires the SR-IOV PF\n 27:\t\t device to support and enable specific VIRTIO extensions,\n 28:\t\t otherwise this driver provides no additional functionality\n 29:\t\t beyond vfio-pci.\n 30:\t\n 31:\t\t If you don't know what to do here, say N.\n" }
19/2	2026/10/01 15:24	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 30482 output: 30 thoughts: 2205 Thoughts: VFIO-PCI and Syzkaller Fuzzing: A Critical Examination Okay, so I'm diving into the potential for syzkaller to effectively fuzz `vfio-pci`. First, I see the driver overrides for Red Hat Qumranet devices (0x1041, 0x1042) which are Modern Virtio, and the `override_only` flag. This means the driver only binds if the `dev->driver_override` sysfs attribute is written to. I then looked into recent changes within `vfio_pci_core.c`, noting refactoring of VGA decoding, the direct use of the `vfio_pci_core_device` struct within runtime suspend/resume, and an updated AER error detection. Also, the `vfio_pci_pm_ops` and `vfio_pci_aer_err_detected` are now defined in `vfio_pci.c`. The crucial question: can syzkaller actually use `vfio-pci`? I quickly remembered that VFIO operates as a user-space driver framework through `/dev/vfio/vfio` and `/dev/vfio/devices/xxx`. This means that a PCI device must be bound to `vfio-pci` (or another vfio driver) for these devices to exist! I need to confirm if syzkaller automatically binds PCI devices to `vfio-pci`. Does it write to `/sys/bus/pci/devices/.../driver_override`? My knowledge of syzkaller tells me it doesn't do arbitrary sysfs writes. It uses syscalls from a root context, but it doesn't do PCI rebinding through sysfs or generate random sysfs scripts. Syzkaller has `openat$vfio` and `ioctl$VFIO_` pseudo-syscalls but they reference the vfio container device (`/dev/vfio/vfio`). Opening `/dev/vfio/vfio` creates the container, but it does not* bind the PCI device, and the vfio device fds require a group, and the group requires PCI device registration with `vfio-pci`. The main question is: Does syzkaller or QEMU bind any PCI devices to `vfio-pci` by default? The devices in QEMU are typically virtio-net, virtio-block, e1000, etc., bound to their respective drivers. None are bound to `vfio-pci` by default. I see the `PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_ANY_ID, PCI_ANY_ID)` entry in `vfio_pci_table`. I confirmed this matches all devices with `.override_only = PCI_ID_F_VFIO_DRIVER_OVERRIDE`. But critically, during PCI device probing at boot, the system doesn't include the override-only devices. I need to verify how `include_override_only` is handled within the PCI driver matching. So, `vfio-pci` doesn't get devices unless some sort of driver override has occurred.
20/2	2026/10/01 15:24	tool	grepper	0m Args: { "Expression": "include_override_only", "PathPrefix": "drivers/pci/" } Results: { "Output": "drivers/pci/pci-driver.c=114=static void pci_free_dynids(struct pci_driver drv)\n--\ndrivers/pci/pci-driver.c-129- @dev_id: the actual PCI device ID structure to match against.\ndrivers/pci/pci-driver.c:130: * @include_override_only: also match against device ID entries marked as\ndrivers/pci/pci-driver.c-131- * override only.\n--\ndrivers/pci/pci-driver.c=136=do_pci_match_id(const struct pci_device_id ids,\ndrivers/pci/pci-driver.c-137-\t\tconst struct pci_device_id dev_id,\ndrivers/pci/pci-driver.c:138:\t\tbool include_override_only)\ndrivers/pci/pci-driver.c-139-{\n--\ndrivers/pci/pci-driver.c-141-\t\twhile (ids-\u003evendor \|\| ids-\u003esubvendor \|\| ids-\u003eclass_mask) {\ndrivers/pci/pci-driver.c:142:\t\t\tif ((!ids-\u003eoverride_only \|\| include_override_only) \u0026\u0026\ndrivers/pci/pci-driver.c-143-\t\t\t pci_match_one_id(ids, dev_id))\n" }
21/2	2026/10/01 15:24	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 33756 output: 39 thoughts: 48 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: Analyzing PCI Driver Matching Logic Okay, so I need to understand the control flow surrounding PCI device matching. My immediate focus is going to be on the functions responsible for identifying a PCI device when a driver attempts to bind to it. Specifically, I'm thinking about the calls to `do_pci_match_id`, `pci_match_id`, and `pci_match_device` within `drivers/pci/pci-driver.c`. I need to trace their callers. That seems like the logical starting point for understanding how the matching process is initiated and driven, what the key decision points are, and how the driver binding ultimately works in the kernel. This should help me understand the intricacies of the driver matching process and any potential issues regarding device driver bindings.
22/2	2026/10/01 15:24	tool	read-file	0m Args: { "File": "drivers/pci/pci-driver.c", "FirstLine": 145, "LineCount": 40 } Results: { "Contents": " 145:\t\t\t\tids++;\n 146:\t\t\t}\n 147:\t\t}\n 148:\t\treturn NULL;\n 149:\t}\n 150:\t\n 151:\t/*\n 152:\t pci_match_id - See if a PCI device matches a given pci_id table\n 153:\t * @ids: array of PCI device ID structures to search in\n 154:\t * @dev: the PCI device structure to match against.\n 155:\t \n 156:\t Used by a driver to check whether a PCI device is in its list of\n 157:\t * supported devices. Returns the matching pci_device_id structure or\n 158:\t * %NULL if there is no match.\n 159:\t \n 160:\t Deprecated; don't use this as it will not catch any dynamic IDs\n 161:\t * that a driver might want to check for.\n 162:\t /\n 163:\tconst struct pci_device_id pci_match_id(const struct pci_device_id ids,\n 164:\t\t\t\t\t\t struct pci_dev dev)\n 165:\t{\n 166:\t\tstruct pci_device_id dev_id = pci_id_from_device(dev);\n 167:\t\n 168:\t\treturn do_pci_match_id(ids, \u0026dev_id, true);\n 169:\t}\n 170:\tEXPORT_SYMBOL(pci_match_id);\n 171:\t\n 172:\tstatic const struct pci_device_id pci_device_id_any = {\n 173:\t\t.vendor = PCI_ANY_ID,\n 174:\t\t.device = PCI_ANY_ID,\n 175:\t\t.subvendor = PCI_ANY_ID,\n 176:\t\t.subdevice = PCI_ANY_ID,\n 177:\t};\n 178:\t\n 179:\t/*\n 180:\t pci_match_device - See if a device matches a driver's list of IDs\n 181:\t * @drv: the PCI driver to match against\n 182:\t * @dev: the PCI device structure to match against\n 183:\t * @id_copy: place to store copy of pci_device_id for dynamic ID\n 184:\t *\n" }
23/2	2026/10/01 15:24	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 34656 output: 39 thoughts: 27 Thoughts: Okay, here's my interpretation of what's going on in those lines of `drivers/pci/pci-driver.c`, as if it were my internal monologue: Diving into PCI Driver Initialization Alright, time to get into the nitty-gritty. Let me focus on lines 185-230 within `drivers/pci/pci-driver.c`. This section is undoubtedly crucial – it's where we're likely handling the core initialization sequence for a PCI driver. I need to understand how the system discovers and probes PCI devices, how it matches them to available drivers, and what data structures are being manipulated. First, I'm expecting to see calls related to `pci_register_driver()` or something similar. This is the registration point – the driver's way of saying, "Hey, I'm here! I'm capable of handling devices with these characteristics." I'll be looking for the structures passed to this function: `pci_driver` probably contains the device ID table (crucial for matching), probe functions, and other callbacks. The device ID table is what tells the system what devices this driver can work with, matching vendor/device IDs, subsystem IDs, and so on. Next, I need to see what happens when a matching device is found. There should be a probe function. This is the core of the driver's operation. I'm expecting this probe function to: * Allocate Driver Data: Allocate and initialize a driver-private data structure, probably using `devm_kzalloc` or similar memory management functions. This will hold device-specific information like base addresses, IRQ numbers, and any per-device configuration. * Request Resources: Call functions like `pci_request_regions()` to claim the PCI BARs (Base Address Registers) that the device requires. This is critical to prevent conflicts with other drivers. I might also see `pci_request_irq()` to claim an interrupt line. Resource management is essential. * Device Configuration: Read the device's configuration space, using `pci_read_config_()` functions, to determine its capabilities. This could include things like the maximum payload size, interrupt routing, and link capabilities. It is the job of the probe function to initialize the hardware, and to put it into a consistent state for operation. PCI Device Setup: Set up the driver-private data structure (likely to include pointers to the PCI device's BARs, interrupt handler, etc.) * Driver Initialization: Initialize the device hardware. The code here needs to be robust. It needs to handle potential errors gracefully. I'll be watching for error checks on resource requests (what happens if a BAR is already claimed?), interrupt registration, and so on. There should be cleanup code (using `devm_kfree` or `pci_release_regions`) that executes if any of these operations fail, ensuring the system doesn't leak resources or leave the PCI bus in an inconsistent state. The goal is a clean, reliable initialization, or a clean and safe failure. Essentially, I'm trying to decipher how this driver gets its hands on the PCI device, claims its resources, and prepares it for its intended function. This is the foundation upon which everything else is built.
24/2	2026/10/01 15:24	tool	read-file	0m Args: { "File": "drivers/pci/pci-driver.c", "FirstLine": 185, "LineCount": 45 } Results: { "Contents": " 185:\t * Used by a driver to check whether a PCI device is in its list of\n 186:\t * supported devices or in the dynids list, which may have been augmented\n 187:\t * via the sysfs \"new_id\" file. Returns the matching pci_device_id\n 188:\t * structure or %NULL if there is no match.\n 189:\t /\n 190:\tstatic const struct pci_device_id pci_match_device(struct pci_driver drv,\n 191:\t\t\t\t\t\t\t struct pci_dev dev,\n 192:\t\t\t\t\t\t\t struct pci_device_id id_copy)\n 193:\t{\n 194:\t\tconst struct pci_device_id found_id = NULL;\n 195:\t\tstruct pci_device_id dev_id;\n 196:\t\tint ret;\n 197:\t\n 198:\t\t/* When driver_override is set, only bind to the matching driver /\n 199:\t\tret = device_match_driver_override(\u0026dev-\u003edev, \u0026drv-\u003edriver);\n 200:\t\tif (ret == 0)\n 201:\t\t\treturn NULL;\n 202:\t\n 203:\t\tdev_id = pci_id_from_device(dev);\n 204:\t\t/ Look at the dynamic ids first, before the static ones /\n 205:\t\tscoped_guard(spinlock, \u0026drv-\u003edynids.lock) {\n 206:\t\t\tstruct pci_dynid dynid;\n 207:\t\n 208:\t\t\tlist_for_each_entry(dynid, \u0026drv-\u003edynids.list, node) {\n 209:\t\t\t\tif (pci_match_one_id(\u0026dynid-\u003eid, \u0026dev_id)) {\n 210:\t\t\t\t\tid_copy = dynid-\u003eid;\n 211:\t\t\t\t\treturn id_copy;\n 212:\t\t\t\t}\n 213:\t\t\t}\n 214:\t\t}\n 215:\t\n 216:\t\tfound_id = do_pci_match_id(drv-\u003eid_table, \u0026dev_id, ret \u003e 0);\n 217:\t\tif (found_id)\n 218:\t\t\treturn found_id;\n 219:\t\n 220:\t\t/ driver_override will always match, send a dummy id /\n 221:\t\tif (ret \u003e 0)\n 222:\t\t\treturn \u0026pci_device_id_any;\n 223:\t\treturn NULL;\n 224:\t}\n 225:\t\n 226:\t/\n 227:\t new_id_store - sysfs frontend to pci_add_dynid()\n 228:\t * @driver: target device driver\n 229:\t * @buf: buffer for scanning device ID data\n" }
25/2	2026/10/01 15:24	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 36170 output: 42 thoughts: 1136 Thoughts: Analyzing VFIO Driver Matching and Syzkaller Applicability Okay, so I've been digging into this VFIO driver matching logic and a potential patch. Here's my thought process: First, I see the core issue: `ret = device_match_driver_override(&dev->dev, &drv->driver);`. If `driver_override` isn't set ( `ret < 0`), which I expect it won't be, and if `include_override_only` is false (because `ret > 0` is effectively false), and since the `vfio_pci_table` entries all have `override_only = 1`, `do_pci_match_id` ends up skipping them. Ultimately, this means that NO PCI device will ever bind to `vfio_pci_driver` unless the `driver_override` attribute is explicitly configured via sysfs or `new_id` is written. That makes sense, actually, because VFIO is designed for PCI device passthrough. Standard devices in Linux bind to their native drivers first (like virtio, e1000, etc.), and only when someone explicitly unbinds a device and binds it to `vfio-pci` via sysfs does `vfio_pci_driver` come into play. But this raises a question: is sysfs driver unbinding/binding tested by syzkaller? I need to go back and check the guidelines. Okay, let's see. Section 2 talks about what's not relevant: "Structurally unreachable hardware" like vendor-specific PCIe switches, GPUs, and drivers that require specific hardware not emulated in standard QEMU. Also "Unreachable execution paths" like driver teardown callbacks that are only executed during physical hot-unplug or manual sysfs driver unbinding. That sounds relevant! Now, the negative criteria: "Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories: Non-kernel and non-executable changes, Structurally unreachable hardware and, Unreachable execution paths. Alright, time to analyze each file touched by this patch, considering those categories: 1. `drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c`: HiSilicon accelerator. This definitely requires HiSilicon ASIC/PCIe hardware. Structurally unreachable hardware. 2. `drivers/vfio/pci/ism/main.c`: IBM ISM VFIO driver. Needs s390 ISM hardware. Structurally unreachable hardware and potentially exclusive to s390 architecture, and we're targeting amd64. 3. `drivers/vfio/pci/mlx5/main.c`: Mellanox ConnectX VFIO driver. Another case of structurally unreachable hardware (SmartNICs). 4. `drivers/vfio/pci/nvgrace-gpu/main.c`: NVIDIA Grace GPU VFIO driver. Structurally unreachable hardware (vendor-specific GPU). 5. `drivers/vfio/pci/pds/pci_drv.c` and `drivers/vfio/pci/pds/vfio_dev.c`: AMD/Pensando DSC VFIO. Structurally unreachable hardware (SmartNICs). 6. `drivers/vfio/pci/qat/main.c`: Intel QAT VFIO. Structurally unreachable hardware (crypto/compression accelerator). 7. `drivers/vfio/pci/xe/main.c`: Intel Xe GPU VFIO. Structurally unreachable hardware (discrete GPU). 8. `drivers/vfio/pci/virtio/main.c`: Hmm, `virtiovf`...wait. What is that? Let's quickly check the files in that directory. Okay, I see. It matches `PCI_VENDOR_ID_REDHAT_QUMRANET, 0x1041` (virtio-net) and `PCI_VENDOR_ID_REDHAT_QUMRANET, 0x1042` (virtio-block), but WITH `override_only` set, meaning only with override via sysfs. The key question is whether this works on standard emulated virtio devices in QEMU? I need to check `drivers/vfio/pci/virtio/main.c` now to know!
26/2	2026/10/01 15:25	tool	read-file	0m Args: { "File": "drivers/vfio/pci/virtio/main.c", "FirstLine": 140, "LineCount": 55 } Results: { "Contents": " 140:\t\t.read = vfio_pci_core_read,\n 141:\t\t.write = vfio_pci_core_write,\n 142:\t\t.mmap = vfio_pci_core_mmap,\n 143:\t\t.request = vfio_pci_core_request,\n 144:\t\t.match = vfio_pci_core_match,\n 145:\t\t.match_token_uuid = vfio_pci_core_match_token_uuid,\n 146:\t\t.bind_iommufd = vfio_iommufd_physical_bind,\n 147:\t\t.unbind_iommufd = vfio_iommufd_physical_unbind,\n 148:\t\t.attach_ioas = vfio_iommufd_physical_attach_ioas,\n 149:\t\t.detach_ioas = vfio_iommufd_physical_detach_ioas,\n 150:\t};\n 151:\t\n 152:\tstatic int virtiovf_pci_probe(struct pci_dev pdev,\n 153:\t\t\t\t const struct pci_device_id id)\n 154:\t{\n 155:\t\tconst struct vfio_device_ops ops = \u0026virtiovf_vfio_pci_ops;\n 156:\t\tstruct virtiovf_pci_core_device virtvdev;\n 157:\t\tbool sup_legacy_io = false;\n 158:\t\tbool sup_lm = false;\n 159:\t\tint ret;\n 160:\t\n 161:\t\tif (pdev-\u003eis_virtfn) {\n 162:\t#ifdef CONFIG_VIRTIO_VFIO_PCI_ADMIN_LEGACY\n 163:\t\t\tsup_legacy_io = virtiovf_support_legacy_io(pdev);\n 164:\t\t\tif (sup_legacy_io)\n 165:\t\t\t\tops = \u0026virtiovf_vfio_pci_tran_lm_ops;\n 166:\t#endif\n 167:\t\t\tsup_lm = virtio_pci_admin_has_dev_parts(pdev);\n 168:\t\t\tif (sup_lm \u0026\u0026 !sup_legacy_io)\n 169:\t\t\t\tops = \u0026virtiovf_vfio_pci_lm_ops;\n 170:\t\t}\n 171:\t\n 172:\t\tvirtvdev = vfio_alloc_device(virtiovf_pci_core_device, core_device.vdev,\n 173:\t\t\t\t\t \u0026pdev-\u003edev, ops);\n 174:\t\tif (IS_ERR(virtvdev))\n 175:\t\t\treturn PTR_ERR(virtvdev);\n 176:\t\n 177:\t\tif (sup_lm)\n 178:\t\t\tvirtiovf_set_migratable(virtvdev);\n 179:\t\n 180:\t\tdev_set_drvdata(\u0026pdev-\u003edev, virtvdev);\n 181:\t\tret = vfio_pci_core_register_device(\u0026virtvdev-\u003ecore_device);\n 182:\t\tif (ret)\n 183:\t\t\tgoto out;\n 184:\t\treturn 0;\n 185:\tout:\n 186:\t\tvfio_put_device(\u0026virtvdev-\u003ecore_device.vdev);\n 187:\t\treturn ret;\n 188:\t}\n 189:\t\n 190:\tstatic void virtiovf_pci_remove(struct pci_dev pdev)\n 191:\t{\n 192:\t\tstruct virtiovf_pci_core_device virtvdev = dev_get_drvdata(\u0026pdev-\u003edev);\n 193:\t\n 194:\t\tvfio_pci_core_unregister_device(\u0026virtvdev-\u003ecore_device);\n" }
27/2	2026/10/01 15:25	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 39327 output: 20 thoughts: 235 Thoughts: VFIO PCI Investigation Okay, let's break this down. I'm looking at `virtiovf_pci_probe`, and the immediate thought is: this only comes into play when a device has been specifically told to use it via `driver_override`. Interesting, but not the whole picture. I need to consider `drivers/vfio/pci/vfio_pci.c` and `drivers/vfio/pci/vfio_pci_core.c` – what's the relationship there? A crucial question pops up: is `vfio_pci` even reachable by syzkaller at all? That's the real crux of this investigation. Now, I'm taking a step back. Why is VFIO even in the kernel? Right, Virtual Function I/O. It's about providing direct PCI device access to user space. Think QEMU, think DPDK... it's a critical technology for virtualization and high-performance I/O. So, for a PCI device to be using VFIO, it has to be attached to `vfio-pci`. The million-dollar question again: Does syzkaller specifically fuzz VFIO PCI devices? This is where the focus has to be. I need to find evidence one way or the other. I'm going to search for direct syzkaller definitions or related kernel code to see if there's any active fuzzing or coverage of the VFIO PCI components. Just to be absolutely sure, is VFIO PCI being fuzzed in syzkaller or syzbot? I need to clarify what the situation is. I can quickly determine the status by searching for `CONFIG_VFIO_PCI` in the kernel to trace where it's being used and referenced. That's the key to figuring out how, or even if, it's being targeted by the fuzzing process.
28/2	2026/10/01 15:25	tool	grepper	0m Args: { "Expression": "CONFIG_VFIO_PCI" } Results: { "Output": "arch/arm64/configs/defconfig=1412=CONFIG_VFIO=y\narch/arm64/configs/defconfig:1413:CONFIG_VFIO_PCI=y\narch/arm64/configs/defconfig-1414-CONFIG_VIRTIO_PCI=y\n--\narch/loongarch/configs/loongson32_defconfig=902=CONFIG_VFIO=m\narch/loongarch/configs/loongson32_defconfig:903:CONFIG_VFIO_PCI=m\narch/loongarch/configs/loongson32_defconfig-904-CONFIG_VIRTIO_PCI=y\n--\narch/loongarch/configs/loongson64_defconfig=931=CONFIG_VFIO=m\narch/loongarch/configs/loongson64_defconfig:932:CONFIG_VFIO_PCI=m\narch/loongarch/configs/loongson64_defconfig-933-CONFIG_VIRTIO_PCI=y\n--\narch/s390/configs/debug_defconfig=636=CONFIG_VFIO=m\narch/s390/configs/debug_defconfig:637:CONFIG_VFIO_PCI=m\narch/s390/configs/debug_defconfig-638-CONFIG_MLX5_VFIO_PCI=m\n--\narch/s390/configs/defconfig=626=CONFIG_VFIO=m\narch/s390/configs/defconfig:627:CONFIG_VFIO_PCI=m\narch/s390/configs/defconfig-628-CONFIG_MLX5_VFIO_PCI=m\n--\narch/s390/kvm/s390/Makefile=11=kvm-y += $(gmap-y)\narch/s390/kvm/s390/Makefile-12-\narch/s390/kvm/s390/Makefile:13:kvm-$(CONFIG_VFIO_PCI_ZDEV_KVM) += pci.o\narch/s390/kvm/s390/Makefile-14-obj-$(CONFIG_KVM) += kvm.o\n--\narch/s390/kvm/s390/interrupt.c=3661=static void gib_alert_irq_handler(struct airq_struct airq,\n--\narch/s390/kvm/s390/interrupt.c-3668-\tif ((info-\u003eforward \|\| info-\u003eerror) \u0026\u0026\narch/s390/kvm/s390/interrupt.c:3669:\t IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) {\narch/s390/kvm/s390/interrupt.c-3670-\t\taen_process_gait(info-\u003eisc);\n--\narch/s390/kvm/s390/pci.h=48=static inline struct kvm kvm_s390_pci_si_to_kvm(struct zpci_aift aift,\n--\narch/s390/kvm/s390/pci.h-50-{\narch/s390/kvm/s390/pci.h:51:\tif (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM) \|\| !aift-\u003ekzdev \|\|\narch/s390/kvm/s390/pci.h-52-\t !aift-\u003ekzdev[si])\n--\narch/s390/kvm/s390/pci.h=68=static inline bool kvm_s390_pci_interp_allowed(void)\n--\narch/s390/kvm/s390/pci.h-82-\tdefault:\narch/s390/kvm/s390/pci.h:83:\t\treturn (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM) \u0026\u0026\narch/s390/kvm/s390/pci.h-84-\t\t\tsclp.has_zpci_lsi \u0026\u0026 sclp.has_aeni \u0026\u0026 sclp.has_aisi \u0026\u0026\n--\narch/s390/kvm/s390/s390.c=496=static int __init __kvm_s390_init(void)\n--\narch/s390/kvm/s390/s390.c-520-\narch/s390/kvm/s390/s390.c:521:\tif (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) {\narch/s390/kvm/s390/s390.c-522-\t\trc = kvm_s390_pci_init();\n--\narch/s390/kvm/s390/s390.c-538-err_gib:\narch/s390/kvm/s390/s390.c:539:\tif (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM))\narch/s390/kvm/s390/s390.c-540-\t\tkvm_s390_pci_exit();\n--\narch/s390/kvm/s390/s390.c=550=static void __kvm_s390_exit(void)\n--\narch/s390/kvm/s390/s390.c-555-\tkvm_s390_gib_destroy();\narch/s390/kvm/s390/s390.c:556:\tif (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM))\narch/s390/kvm/s390/s390.c-557-\t\tkvm_s390_pci_exit();\n--\narch/s390/kvm/s390/s390.c=2900=int kvm_arch_vm_ioctl(struct file filp, unsigned int ioctl, unsigned long arg)\n--\narch/s390/kvm/s390/s390.c-3063-\t\tr = -EINVAL;\narch/s390/kvm/s390/s390.c:3064:\t\tif (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM))\narch/s390/kvm/s390/s390.c-3065-\t\t\tbreak;\n--\narch/s390/kvm/s390/s390.c=3232=void kvm_arch_free_vm(struct kvm kvm)\narch/s390/kvm/s390/s390.c-3233-{\narch/s390/kvm/s390/s390.c:3234:\tif (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM))\narch/s390/kvm/s390/s390.c-3235-\t\tkvm_s390_pci_clear_list(kvm);\n--\narch/s390/kvm/s390/s390.c=3240=int kvm_arch_init_vm(struct kvm kvm, unsigned long type)\n--\narch/s390/kvm/s390/s390.c-3316-\narch/s390/kvm/s390/s390.c:3317:\tif (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) {\narch/s390/kvm/s390/s390.c-3318-\t\tmutex_lock(\u0026kvm-\u003elock);\n--\ndrivers/iommu/iommufd/pages.c=1463=sym_vfio_pci_dma_buf_iommufd_map(struct dma_buf_attachment attachment,\n--\ndrivers/iommu/iommufd/pages.c-1472-\ndrivers/iommu/iommufd/pages.c:1473:\tif (!IS_ENABLED(CONFIG_VFIO_PCI_DMABUF))\ndrivers/iommu/iommufd/pages.c-1474-\t\treturn -EOPNOTSUPP;\n--\ndrivers/vfio/Makefile=13=obj-$(CONFIG_VFIO_IOMMU_SPAPR_TCE) += vfio_iommu_spapr_tce.o\ndrivers/vfio/Makefile:14:obj-$(CONFIG_VFIO_PCI_CORE) += pci/\ndrivers/vfio/Makefile-15-obj-$(CONFIG_VFIO_PLATFORM_BASE) += platform/\n--\ndrivers/vfio/pci/Makefile=3=vfio-pci-core-y := vfio_pci_core.o vfio_pci_intrs.o vfio_pci_rdwr.o vfio_pci_config.o\ndrivers/vfio/pci/Makefile:4:vfio-pci-core-$(CONFIG_VFIO_PCI_ZDEV_KVM) += vfio_pci_zdev.o\ndrivers/vfio/pci/Makefile:5:vfio-pci-core-$(CONFIG_VFIO_PCI_DMABUF) += vfio_pci_dmabuf.o\ndrivers/vfio/pci/Makefile:6:obj-$(CONFIG_VFIO_PCI_CORE) += vfio-pci-core.o\ndrivers/vfio/pci/Makefile-7-\ndrivers/vfio/pci/Makefile=8=vfio-pci-y := vfio_pci.o\ndrivers/vfio/pci/Makefile:9:vfio-pci-$(CONFIG_VFIO_PCI_IGD) += vfio_pci_igd.o\ndrivers/vfio/pci/Makefile:10:obj-$(CONFIG_VFIO_PCI) += vfio-pci.o\ndrivers/vfio/pci/Makefile-11-\n--\ndrivers/vfio/pci/vfio_pci.c=39=MODULE_PARM_DESC(nointxmask,\n--\ndrivers/vfio/pci/vfio_pci.c-41-\ndrivers/vfio/pci/vfio_pci.c:42:#ifdef CONFIG_VFIO_PCI_VGA\ndrivers/vfio/pci/vfio_pci.c-43-static bool disable_vga;\n--\ndrivers/vfio/pci/vfio_pci.c=128=static int vfio_pci_init_dev(struct vfio_device core_vdev)\n--\ndrivers/vfio/pci/vfio_pci.c-141-\tvdev-\u003edisable_idle_d3 = disable_idle_d3;\ndrivers/vfio/pci/vfio_pci.c:142:#ifdef CONFIG_VFIO_PCI_VGA\ndrivers/vfio/pci/vfio_pci.c-143-\tvdev-\u003edisable_vga = disable_vga;\n--\ndrivers/vfio/pci/vfio_pci_config.c=1750=int vfio_config_init(struct vfio_pci_core_device vdev)\n--\ndrivers/vfio/pci/vfio_pci_config.c-1832-\ndrivers/vfio/pci/vfio_pci_config.c:1833:\tif (!IS_ENABLED(CONFIG_VFIO_PCI_INTX) \|\| vdev-\u003enointx \|\|\ndrivers/vfio/pci/vfio_pci_config.c-1834-\t !vdev-\u003epdev-\u003eirq \|\| vdev-\u003epdev-\u003eirq == IRQ_NOTCONNECTED)\n--\ndrivers/vfio/pci/vfio_pci_core.c=94=static inline bool vfio_vga_disabled(struct vfio_pci_core_device vdev)\ndrivers/vfio/pci/vfio_pci_core.c-95-{\ndrivers/vfio/pci/vfio_pci_core.c:96:#ifdef CONFIG_VFIO_PCI_VGA\ndrivers/vfio/pci/vfio_pci_core.c-97-\treturn vdev-\u003edisable_vga;\n--\ndrivers/vfio/pci/vfio_pci_priv.h=44=ssize_t vfio_pci_bar_rw(struct vfio_pci_core_device vdev, char __user buf,\n--\ndrivers/vfio/pci/vfio_pci_priv.h-46-\ndrivers/vfio/pci/vfio_pci_priv.h:47:#ifdef CONFIG_VFIO_PCI_VGA\ndrivers/vfio/pci/vfio_pci_priv.h-48-ssize_t vfio_pci_vga_rw(struct vfio_pci_core_device vdev, char __user buf,\n--\ndrivers/vfio/pci/vfio_pci_priv.h=73=void vfio_pci_memory_unlock_and_restore(struct vfio_pci_core_device vdev,\n--\ndrivers/vfio/pci/vfio_pci_priv.h-75-\ndrivers/vfio/pci/vfio_pci_priv.h:76:#ifdef CONFIG_VFIO_PCI_IGD\ndrivers/vfio/pci/vfio_pci_priv.h-77-bool vfio_pci_is_intel_display(struct pci_dev pdev);\n--\ndrivers/vfio/pci/vfio_pci_priv.h=85=static inline int vfio_pci_igd_init(struct vfio_pci_core_device vdev)\n--\ndrivers/vfio/pci/vfio_pci_priv.h-90-\ndrivers/vfio/pci/vfio_pci_priv.h:91:#ifdef CONFIG_VFIO_PCI_ZDEV_KVM\ndrivers/vfio/pci/vfio_pci_priv.h-92-int vfio_pci_info_zdev_add_caps(struct vfio_pci_core_device vdev,\n--\ndrivers/vfio/pci/vfio_pci_priv.h=121=static inline bool vfio_pci_is_vga(struct pci_dev pdev)\n--\ndrivers/vfio/pci/vfio_pci_priv.h-125-\ndrivers/vfio/pci/vfio_pci_priv.h:126:#ifdef CONFIG_VFIO_PCI_DMABUF\ndrivers/vfio/pci/vfio_pci_priv.h-127-int vfio_pci_core_feature_dma_buf(struct vfio_pci_core_device vdev, u32 flags,\n--\ndrivers/vfio/pci/vfio_pci_rdwr.c=201=ssize_t vfio_pci_bar_rw(struct vfio_pci_core_device vdev, char __user buf,\n--\ndrivers/vfio/pci/vfio_pci_rdwr.c-280-\ndrivers/vfio/pci/vfio_pci_rdwr.c:281:#ifdef CONFIG_VFIO_PCI_VGA\ndrivers/vfio/pci/vfio_pci_rdwr.c-282-ssize_t vfio_pci_vga_rw(struct vfio_pci_core_device vdev, char __user buf,\n--\ninclude/linux/sched/user.h=14=struct user_struct {\n--\ninclude/linux/sched/user.h-27-\tdefined(CONFIG_NET) \|\| defined(CONFIG_IO_URING) \|\| \\\ninclude/linux/sched/user.h:28:\tdefined(CONFIG_VFIO_PCI_ZDEV_KVM) \|\| IS_ENABLED(CONFIG_IOMMUFD)\ninclude/linux/sched/user.h-29-\tatomic_long_t locked_vm;\n--\ninclude/linux/vfio_pci_core.h=62=struct vfio_pci_device_ops {\n--\ninclude/linux/vfio_pci_core.h-70-\ninclude/linux/vfio_pci_core.h:71:#if IS_ENABLED(CONFIG_VFIO_PCI_DMABUF)\ninclude/linux/vfio_pci_core.h-72-int vfio_pci_core_fill_phys_vec(struct phys_vec *phys_vec,\n" }
29/2	2026/10/01 15:25	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 44257 output: 36 thoughts: 40 Thoughts: Okay, let's break this down. Investigating VFIO-PCI Device Binding Right, so I need to figure out which devices are capable of binding to the `vfio-pci` driver, or, for that matter, any VFIO PCI driver. The place to start, as always, is the source code. Specifically, the Kconfig file for `vfio-pci`. Let's see what that reveals about the supported device classes, IDs, and any conditional binding logic. Time to dig in and see what the build configuration can tell me.
30/2	2026/10/01 15:25	tool	read-file	0m Args: { "File": "drivers/vfio/pci/Kconfig", "FirstLine": 1, "LineCount": 60 } Results: { "Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0-only\n 2:\tmenu \"VFIO support for PCI devices\"\n 3:\t\tdepends on PCI\n 4:\t\n 5:\tconfig VFIO_PCI_CORE\n 6:\t\ttristate\n 7:\t\tselect VFIO_VIRQFD\n 8:\t\tselect IRQ_BYPASS_MANAGER\n 9:\t\n 10:\tconfig VFIO_PCI_INTX\n 11:\t\tdef_bool y if !S390\n 12:\t\tdepends on VFIO_PCI_CORE\n 13:\t\n 14:\tconfig VFIO_PCI\n 15:\t\ttristate \"Generic VFIO support for any PCI device\"\n 16:\t\tselect VFIO_PCI_CORE\n 17:\t\thelp\n 18:\t\t Support for the generic PCI VFIO bus driver which can connect any\n 19:\t\t PCI device to the VFIO framework.\n 20:\t\n 21:\t\t If you don't know what to do here, say N.\n 22:\t\n 23:\tif VFIO_PCI\n 24:\tconfig VFIO_PCI_VGA\n 25:\t\tbool \"Generic VFIO PCI support for VGA devices\"\n 26:\t\tdepends on X86 \u0026\u0026 VGA_ARB\n 27:\t\thelp\n 28:\t\t Support for VGA extension to VFIO PCI. This exposes an additional\n 29:\t\t region on VGA devices for accessing legacy VGA addresses used by\n 30:\t\t BIOS and generic video drivers.\n 31:\t\n 32:\t\t If you don't know what to do here, say N.\n 33:\t\n 34:\tconfig VFIO_PCI_IGD\n 35:\t\tbool \"Generic VFIO PCI extensions for Intel graphics (GVT-d)\"\n 36:\t\tdepends on X86\n 37:\t\tdefault y\n 38:\t\thelp\n 39:\t\t Support for Intel IGD specific extensions to enable direct\n 40:\t\t assignment to virtual machines. This includes exposing an IGD\n 41:\t\t specific firmware table and read-only copies of the host bridge\n 42:\t\t and LPC bridge config space.\n 43:\t\n 44:\t\t To enable Intel IGD assignment through vfio-pci, say Y.\n 45:\tendif\n 46:\t\n 47:\tconfig VFIO_PCI_ZDEV_KVM\n 48:\t\tbool \"VFIO PCI extensions for s390x KVM passthrough\"\n 49:\t\tdepends on S390 \u0026\u0026 KVM\n 50:\t\tdefault y\n 51:\t\thelp\n 52:\t\t Support s390x-specific extensions to enable support for enhancements\n 53:\t\t to KVM passthrough capabilities, such as interpretive execution of\n 54:\t\t zPCI instructions.\n 55:\t\n 56:\t\t To enable s390x KVM vfio-pci extensions, say Y.\n 57:\t\n 58:\tconfig VFIO_PCI_DMABUF\n 59:\t\tdef_bool y if VFIO_PCI_CORE \u0026\u0026 PCI_P2PDMA \u0026\u0026 DMA_SHARED_BUFFER\n 60:\t\n" }
31/2	2026/10/01 15:25	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 45261 output: 37 thoughts: 19 Thoughts: Okay, here's my attempt at summarizing the thought process, as requested, aimed at an expert audience and in the first person: Navigating the VFIO PCI Configuration Alright, let's dive into this `drivers/vfio/pci/Kconfig` file. I need to understand how these VFIO PCI features are configured, and a Kconfig file is the place to start. I'm assuming there's some interesting stuff down here, maybe related to exposing PCI devices to user space. I'm looking for the core options, dependencies, and any subtleties in how the configuration is structured. What knobs do we have to tune? What dependencies are lurking? Hopefully, it's well-organized and clearly documents the rationale behind each choice. Time to get my hands dirty and dig in.
32/2	2026/10/01 15:25	tool	read-file	0m Args: { "File": "drivers/vfio/pci/Kconfig", "FirstLine": 61, "LineCount": 40 } Results: { "Contents": " 61:\tsource \"drivers/vfio/pci/mlx5/Kconfig\"\n 62:\t\n 63:\tsource \"drivers/vfio/pci/ism/Kconfig\"\n 64:\t\n 65:\tsource \"drivers/vfio/pci/hisilicon/Kconfig\"\n 66:\t\n 67:\tsource \"drivers/vfio/pci/pds/Kconfig\"\n 68:\t\n 69:\tsource \"drivers/vfio/pci/virtio/Kconfig\"\n 70:\t\n 71:\tsource \"drivers/vfio/pci/nvgrace-gpu/Kconfig\"\n 72:\t\n 73:\tsource \"drivers/vfio/pci/qat/Kconfig\"\n 74:\t\n 75:\tsource \"drivers/vfio/pci/xe/Kconfig\"\n 76:\t\n 77:\tendmenu\n" }
33/2	2026/10/01 15:25	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 45731 output: 22 thoughts: 2637 Thoughts: VFIO-PCI Driver Reachability in Syzkaller: An Expert's Perspective Okay, let's break this down. My initial question is how a driver within `drivers/vfio/pci/` can even be loaded when syzkaller's in the mix. I need to figure out if syzkaller's setup, typically QEMU in a VM, would ever naturally bind a PCI device to `vfio-pci`. Let's step back and consider how PCI devices are generally handled in a QEMU/kernel context. QEMU configures PCI devices at launch, but the kernel probes and matches drivers upon boot, right? The core of the problem here is the `.override_only = 1` nature of the `vfio-pci` and `virtiovf_pci_driver`. Without manual intervention via `driver_override` in sysfs, these drivers won't match ANY device. QEMU doesn't do this by default. So, that's a dead end. And all these specific hardware-related drivers are out of the question: mlx5, hisi, ism, nvgrace, pds, qat, xe are for dedicated hardware ASICs which don't exist in a standard QEMU environment. Then, there's manual unbinding/rebinding. But that requires explicit sysfs interaction - and syzkaller does not do manual driver binding or unbinding. It's focused on syscall fuzzing within a VM. Userspace could try to manipulate `driver_override`, but that's manual and not something that happens naturally in the syzkaller workflow. This lines up with the instructions. Based on reading through the "Reachability is the primary gate" section of the instructions: "Fuzzing can only discover bugs in code that can actually execute in standard virtualized environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap)." Section 2 clearly states "Unreachable execution paths" and "Structurally unreachable hardware" are negative criteria, that we should not fuzz. This takes us to Section 2 of the instructions: "Structurally unreachable hardware: Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU." Looking at the listed `drivers/vfio/pci/` subdirectories confirms this. HiSilicon, IBM, Mellanox, NVIDIA, Pensando, Intel QAT, and Intel Xe all fall into the "structurally unreachable" category because they depend on specialized hardware. So, the next question is: Is `vfio_pci` or `vfio_pci_core` reachable? Is `vfio-pci` ever probed or executed? No, syzkaller will never probe `vfio-pci` due to its `PCI_DRIVER_OVERRIDE_DEVICE_VFIO` matching and default absence of `driver_override`. The `pci_match_device` logic confirms this: If `dev->driver_override` is NULL, then `vfio-pci` doesn't match! That's the crux of it.
34/2	2026/10/01 15:26	tool	grepper	0m Args: { "Expression": "int device_match_driver_override" } Results: { "Output": "include/linux/device.h=889=static inline bool device_has_driver_override(struct device dev)\n--\ninclude/linux/device.h-903- /\ninclude/linux/device.h:904:static inline int device_match_driver_override(struct device dev,\ninclude/linux/device.h-905-\t\t\t\t\t const struct device_driver drv)\n" }
35/2	2026/10/01 15:26	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 49217 output: 35 thoughts: 23 Thoughts: Here's my summary, as though I'm reading and processing the `device_match_driver_override` definition: Diving into device_match_driver_override Alright, let's pull up `include/linux/device.h` and get right to `device_match_driver_override`. I know this is a core piece, so I need to be sharp. This likely involves some critical mechanism in the driver probing process. I need to refresh my memory on the broader device model interaction, particularly how the kernel handles the potential for multiple drivers to claim a device and how this override interacts with that. This is where the magic happens, where we can manually ensure the correct driver is bound to a device when things aren't automatically working as intended or when we need specific control. I'm expecting to find some crucial function pointers or flags here, that allow us to tweak the normal driver matching behavior. It will be interesting to see how it's implemented and where this override can be tweaked and when. Time to dig in and see the details of this override mechanism!
36/2	2026/10/01 15:26	tool	read-file	0m Args: { "File": "include/linux/device.h", "FirstLine": 900, "LineCount": 25 } Results: { "Contents": " 900:\t * Returns \u003e 0 if a driver override is set and matches the given driver, 0 if a\n 901:\t * driver override is set but does not match, or \u003c 0 if a driver override is not\n 902:\t * set at all.\n 903:\t /\n 904:\tstatic inline int device_match_driver_override(struct device dev,\n 905:\t\t\t\t\t\t const struct device_driver drv)\n 906:\t{\n 907:\t\tguard(spinlock)(\u0026dev-\u003edriver_override.lock);\n 908:\t\tif (dev-\u003edriver_override.name)\n 909:\t\t\treturn !strcmp(dev-\u003edriver_override.name, drv-\u003ename);\n 910:\t\treturn -1;\n 911:\t}\n 912:\t\n 913:\t/\n 914:\t device_iommu_mapped - Returns true when the device DMA is translated\n 915:\t \t\t\t by an IOMMU\n 916:\t @dev: Device to perform the check on\n 917:\t /\n 918:\tstatic inline bool device_iommu_mapped(struct device dev)\n 919:\t{\n 920:\t\treturn (dev-\u003eiommu_group != NULL);\n 921:\t}\n 922:\t\n 923:\t/* Get the wakeup routines, which depend on struct device */\n 924:\t#include \u003clinux/pm_wakeup.h\u003e\n" }
37/2	2026/10/01 15:26	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 49896 output: 19 thoughts: 560 Thoughts: My Analysis of PCI Driver Binding and VFIO in the Kernel Okay, let's break this down. When a `driver_override` isn't specified, the `device_match_driver_override` function returns -1. That means in `pci_match_device`, the initial return value `ret` is also -1. This is important. Because `ret` is not equal to zero. From there, we go to `do_pci_match_id`. Since `ret > 0` is false, it means we don't include override-only matches. The code `(!ids->override_only \|\| include_override_only)` results in a mismatch because `ids->override_only` is true (1) and `include_override_only` is false. This means `found_id` is going to be NULL. Since `ret` remains negative, we return `NULL`. Therefore, no PCI device will automatically bind to `vfio-pci` or `virtiovf`. It's pretty clear that the only way to get a PCI device bound to those drivers is through explicitly writing the driver name to the `/sys/bus/pci/devices/.../driver_override` file. Now, this raises a question: does syzkaller even support manual sysfs driver unbinding or overriding? Section 2 of the documentation mentions "manual sysfs driver unbinding," which confirms that it's not a standard fuzzing path. It's essentially acknowledging that manual driver binding/unbinding isn't normally executed during fuzzing. I need to know, does syzkaller actually test sysfs driver binding? No, that's not its focus. Syzkaller is focused on fuzzing system calls, not the sysfs driver binding/unbinding that is not part of a standard virtualized environment. So syzkaller does not target this. I'm wondering, does syzkaller have any support for vfio-pci? I should probably check for pseudo-syscalls for vfio within syzkaller. Let's check if syzkaller is able to open `/dev/vfio/vfio`. I'll need to check the `drivers/vfio/vfio_main.c` file to understand how `/dev/vfio/` works. That might give me some idea how to use syzkaller to reach this vfio code.
38/2	2026/10/01 15:26	tool	grepper	0m Args: { "Expression": "/dev/vfio" } Results: { "Output": "Documentation/admin-guide/devices.txt-330-\t\t195 = /dev/elographics/e2201\tElographics touchscreen E271-2201\nDocumentation/admin-guide/devices.txt:331:\t\t196 = /dev/vfio/vfio\tVFIO userspace driver interface\nDocumentation/admin-guide/devices.txt-332-\t\t197 = /dev/pxa3xx-gcu\tPXA3xx graphics controller unit driver\n--\nDocumentation/driver-api/vfio.rst=80=a container class, which may hold one or more groups. A container\nDocumentation/driver-api/vfio.rst:81:is created by simply opening the /dev/vfio/vfio character device.\nDocumentation/driver-api/vfio.rst-82-\n--\nDocumentation/driver-api/vfio.rst=89=device from the host driver and binding it to a VFIO driver, a new\nDocumentation/driver-api/vfio.rst:90:VFIO group will appear for the group as /dev/vfio/$GROUP, where\nDocumentation/driver-api/vfio.rst-91-$GROUP is the IOMMU group number of which the device is a member.\n--\nDocumentation/driver-api/vfio.rst=99=Once the group is ready, it may be added to the container by opening\nDocumentation/driver-api/vfio.rst:100:the VFIO group character device (/dev/vfio/$GROUP) and using the\nDocumentation/driver-api/vfio.rst-101-VFIO_GROUP_SET_CONTAINER ioctl, passing the file descriptor of the\n--\nDocumentation/driver-api/vfio.rst=159=The final step is to provide the user with access to the group if\nDocumentation/driver-api/vfio.rst:160:unprivileged operation is desired (note that /dev/vfio/vfio provides\nDocumentation/driver-api/vfio.rst-161-no capabilities on its own and is therefore expected to be set to\nDocumentation/driver-api/vfio.rst=162=mode 0666 by the system)::\nDocumentation/driver-api/vfio.rst-163-\nDocumentation/driver-api/vfio.rst:164:\t# chown user:user /dev/vfio/26\nDocumentation/driver-api/vfio.rst-165-\n--\nDocumentation/driver-api/vfio.rst=167=group and can access them as follows::\n--\nDocumentation/driver-api/vfio.rst-176-\t/* Create a new container /\nDocumentation/driver-api/vfio.rst:177:\tcontainer = open(\"/dev/vfio/vfio\", O_RDWR);\nDocumentation/driver-api/vfio.rst-178-\n--\nDocumentation/driver-api/vfio.rst-185-\t/ Open the group /\nDocumentation/driver-api/vfio.rst:186:\tgroup = open(\"/dev/vfio/26\", O_RDWR);\nDocumentation/driver-api/vfio.rst-187-\n--\nDocumentation/driver-api/vfio.rst=256=container and IOMMU backend interfaces. The compatibility mode can\nDocumentation/driver-api/vfio.rst:257:also be accessed if the VFIO container interface, ie. /dev/vfio/vfio is\nDocumentation/driver-api/vfio.rst-258-simply symlink'd to /dev/iommu. Note that at the time of writing, the\n--\nDocumentation/driver-api/vfio.rst=275=With CONFIG_VFIO_DEVICE_CDEV=y the user can now acquire a device fd\nDocumentation/driver-api/vfio.rst:276:by directly opening a character device /dev/vfio/devices/vfioX where\nDocumentation/driver-api/vfio.rst-277-\"X\" is the number allocated uniquely by VFIO for registered devices.\n--\nDocumentation/driver-api/vfio.rst=308=its existence::\nDocumentation/driver-api/vfio.rst-309-\nDocumentation/driver-api/vfio.rst:310:\t$ ls -l /dev/vfio/devices/vfio0\nDocumentation/driver-api/vfio.rst:311:\tcrw------- 1 root root 511, 0 Feb 16 01:22 /dev/vfio/devices/vfio0\nDocumentation/driver-api/vfio.rst-312-\t$ cat /sys/bus/pci/devices/0000:6a:01.0/vfio-dev/vfio0/dev\n--\nDocumentation/driver-api/vfio.rst=318=operation is desired::\nDocumentation/driver-api/vfio.rst-319-\nDocumentation/driver-api/vfio.rst:320:\t$ chown user:user /dev/vfio/devices/vfio0\nDocumentation/driver-api/vfio.rst-321-\nDocumentation/driver-api/vfio.rst=322=Finally the user could get cdev fd by::\nDocumentation/driver-api/vfio.rst-323-\nDocumentation/driver-api/vfio.rst:324:\tcdev_fd = open(\"/dev/vfio/devices/vfio0\", O_RDWR);\nDocumentation/driver-api/vfio.rst-325-\n--\nDocumentation/driver-api/vfio.rst=380=with a VFIO group and device file, e.g.::\nDocumentation/driver-api/vfio.rst-381-\nDocumentation/driver-api/vfio.rst:382: /dev/vfio/\nDocumentation/driver-api/vfio.rst-383- \|-- devices\n--\nDocumentation/networking/device_drivers/ethernet/amd/pds_vfio_pci.rst=27=loaded.\n--\nDocumentation/networking/device_drivers/ethernet/amd/pds_vfio_pci.rst-49-\nDocumentation/networking/device_drivers/ethernet/amd/pds_vfio_pci.rst:50:After performing the steps above, a file in /dev/vfio/\u003ciommu_group\u003e\nDocumentation/networking/device_drivers/ethernet/amd/pds_vfio_pci.rst-51-should have been created.\n--\nDocumentation/userspace-api/iommufd.rst=354=Connecting a VFIO device to iommufd can be done in two ways.\nDocumentation/userspace-api/iommufd.rst-355-\nDocumentation/userspace-api/iommufd.rst:356:First is a VFIO compatible way by directly implementing the /dev/vfio/vfio\nDocumentation/userspace-api/iommufd.rst-357-container IOCTLs by mapping them into io_pagetable operations. Doing so allows\nDocumentation/userspace-api/iommufd.rst:358:the use of iommufd in legacy VFIO applications by symlinking /dev/vfio/vfio to\nDocumentation/userspace-api/iommufd.rst-359-/dev/iommufd or extending VFIO to SET_CONTAINER using an iommufd instead of a\n--\narch/um/drivers/vfio_user.c=23=int uml_vfio_user_open_container(void)\n--\narch/um/drivers/vfio_user.c-26-\narch/um/drivers/vfio_user.c:27:\tfd = open(\"/dev/vfio/vfio\", O_RDWR);\narch/um/drivers/vfio_user.c-28-\tif (fd \u003c 0)\n--\narch/um/drivers/vfio_user.c=114=int uml_vfio_user_open_group(int group_id)\n--\narch/um/drivers/vfio_user.c-122-\narch/um/drivers/vfio_user.c:123:\tsprintf(path, \"/dev/vfio/%d\", group_id);\narch/um/drivers/vfio_user.c-124-\n--\ndrivers/iommu/iommufd/Kconfig=31=config IOMMUFD_VFIO_CONTAINER\ndrivers/iommu/iommufd/Kconfig:32:\tbool \"IOMMUFD provides the VFIO container /dev/vfio/vfio\"\ndrivers/iommu/iommufd/Kconfig-33-\tdepends on VFIO_GROUP \u0026\u0026 !VFIO_CONTAINER\n--\ndrivers/iommu/iommufd/Kconfig-35-\thelp\ndrivers/iommu/iommufd/Kconfig:36:\t IOMMUFD will provide /dev/vfio/vfio instead of VFIO. This relies on\ndrivers/iommu/iommufd/Kconfig-37-\t IOMMUFD providing compatibility emulation to give the same ioctls.\n--\ndrivers/iommu/iommufd/main.c=315=static int iommufd_fops_open(struct inode inode, struct file filp)\n--\ndrivers/iommu/iommufd/main.c-323-\t/\ndrivers/iommu/iommufd/main.c:324:\t * For compatibility with VFIO when /dev/vfio/vfio is opened we default\ndrivers/iommu/iommufd/main.c-325-\t * to the same rlimit accounting as vfio uses.\n--\ndrivers/iommu/iommufd/main.c-329-\t\tictx-\u003eaccount_mode = IOPT_PAGES_ACCOUNT_MM;\ndrivers/iommu/iommufd/main.c:330:\t\tpr_info_once(\"IOMMUFD is providing /dev/vfio/vfio, not VFIO.\\n\");\ndrivers/iommu/iommufd/main.c-331-\t}\n--\ndrivers/vfio/Kconfig=17=config VFIO_DEVICE_CDEV\ndrivers/vfio/Kconfig:18:\tbool \"Support for the VFIO cdev /dev/vfio/devices/vfioX\"\ndrivers/vfio/Kconfig-19-\tdepends on IOMMUFD \u0026\u0026 !SPAPR_TCE_IOMMU\n--\ndrivers/vfio/Kconfig-23-\t access. Userspace gets device fd by opening device cdev under\ndrivers/vfio/Kconfig:24:\t /dev/vfio/devices/vfioX, and then bind the device fd with an iommufd\ndrivers/vfio/Kconfig-25-\t to set up secure DMA context for device access.\n--\ndrivers/vfio/Kconfig=29=config VFIO_GROUP\ndrivers/vfio/Kconfig:30:\tbool \"Support for the VFIO group /dev/vfio/$group_id\"\ndrivers/vfio/Kconfig-31-\tdefault y\n--\ndrivers/vfio/Kconfig=39=config VFIO_CONTAINER\ndrivers/vfio/Kconfig:40:\tbool \"Support for the VFIO container /dev/vfio/vfio\"\ndrivers/vfio/Kconfig-41-\tselect VFIO_IOMMU_TYPE1 if MMU \u0026\u0026 (X86 \|\| S390 \|\| ARM \|\| ARM64)\n--\ndrivers/vfio/container.c-4- \ndrivers/vfio/container.c:5: VFIO container (/dev/vfio/vfio)\ndrivers/vfio/container.c-6- /\n--\ndrivers/vfio/container.c=138=EXPORT_SYMBOL_GPL(vfio_unregister_iommu_driver);\n--\ndrivers/vfio/container.c-140-/\ndrivers/vfio/container.c:141: * Container objects - containers are created when /dev/vfio/vfio is\ndrivers/vfio/container.c-142- * opened, but their lifecycle extends until the last user is done, so\n--\ndrivers/vfio/group.c=31=static struct vfio_device vfio_device_get_from_name(struct vfio_group group,\n--\ndrivers/vfio/group.c-60-/\ndrivers/vfio/group.c:61: VFIO Group fd, /dev/vfio/$GROUP\ndrivers/vfio/group.c-62- /\n--\ndrivers/vfio/group.c=893=int __init vfio_group_init(void)\n--\ndrivers/vfio/group.c-904-\ndrivers/vfio/group.c:905:\t/ /dev/vfio/$GROUP /\ndrivers/vfio/group.c-906-\tret = class_register(\u0026vfio_class);\n--\ninclude/uapi/linux/vfio.h=86=struct vfio_info_cap_header {\n--\ninclude/uapi/linux/vfio.h-100-\ninclude/uapi/linux/vfio.h:101:/ -------- IOCTLs for VFIO file descriptor (/dev/vfio/vfio) -------- /\ninclude/uapi/linux/vfio.h-102-\n--\ninclude/uapi/linux/vfio.h-135-\ninclude/uapi/linux/vfio.h:136:/ -------- IOCTLs for GROUP file descriptors (/dev/vfio/$GROUP) -------- /\ninclude/uapi/linux/vfio.h-137-\n--\ntools/testing/selftests/kvm/irq_test.c=153=static const char probe_iommu_type(void)\n--\ntools/testing/selftests/kvm/irq_test.c-162-\ntools/testing/selftests/kvm/irq_test.c:163:\tio_fd = __open_path_or_exit(\"/dev/vfio/vfio\", O_RDONLY,\ntools/testing/selftests/kvm/irq_test.c-164-\t\t\t\t \"Is VFIO (or IOMMUFD) loaded and enabled?\");\n--\ntools/testing/selftests/vfio/lib/iommu.c=26=static const struct iommu_mode iommu_modes[] = {\n--\ntools/testing/selftests/vfio/lib/iommu.c-28-\t\t.name = MODE_VFIO_TYPE1_IOMMU,\ntools/testing/selftests/vfio/lib/iommu.c:29:\t\t.container_path = \"/dev/vfio/vfio\",\ntools/testing/selftests/vfio/lib/iommu.c-30-\t\t.iommu_type = VFIO_TYPE1_IOMMU,\n--\ntools/testing/selftests/vfio/lib/iommu.c-33-\t\t.name = MODE_VFIO_TYPE1V2_IOMMU,\ntools/testing/selftests/vfio/lib/iommu.c:34:\t\t.container_path = \"/dev/vfio/vfio\",\ntools/testing/selftests/vfio/lib/iommu.c-35-\t\t.iommu_type = VFIO_TYPE1v2_IOMMU,\n--\ntools/testing/selftests/vfio/lib/vfio_pci_device.c=285=void vfio_pci_group_setup(struct vfio_pci_device device, const char bdf)\n--\ntools/testing/selftests/vfio/lib/vfio_pci_device.c-293-\tgroup = sysfs_iommu_group_get(bdf);\ntools/testing/selftests/vfio/lib/vfio_pci_device.c:294:\tsnprintf_assert(group_path, sizeof(group_path), \"/dev/vfio/%d\", group);\ntools/testing/selftests/vfio/lib/vfio_pci_device.c-295-\n--\ntools/testing/selftests/vfio/lib/vfio_pci_device.c=383=const char vfio_pci_get_cdev_path(const char bdf)\n--\ntools/testing/selftests/vfio/lib/vfio_pci_device.c-401-\ntools/testing/selftests/vfio/lib/vfio_pci_device.c:402:\t\tsnprintf_assert(cdev_path, PATH_MAX, \"/dev/vfio/devices/%s\", entry-\u003ed_name);\ntools/testing/selftests/vfio/lib/vfio_pci_device.c-403-\t\tbreak;\n" }
39/2	2026/10/01 15:26	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 55114 output: 34 thoughts: 52 Thoughts: Okay, let's dive into this. My initial thought is focused on understanding the mechanics of how these self-tests, specifically within `tools/testing/selftests/vfio/lib/vfio_pci_device.c`, actually bind a device to vfio-pci. I need to understand this process to fully grasp the test's functionality and purpose. The fundamental question is how the tests manage to interact with a device through vfio-pci. I'm going to investigate that directly.
40/2	2026/10/01 15:27	tool	grepper	0m Args: { "Expression": "driver_override", "PathPrefix": "tools/testing/selftests/vfio/" } Results: { "Output": "tools/testing/selftests/vfio/scripts/cleanup.sh=5=function cleanup_devices() {\n--\ntools/testing/selftests/vfio/scripts/cleanup.sh-15-\ntools/testing/selftests/vfio/scripts/cleanup.sh:16:\t\tif [ -f ${device_dir}/driver_override ]; then\ntools/testing/selftests/vfio/scripts/cleanup.sh:17:\t\t\tclear_driver_override ${device_bdf}\ntools/testing/selftests/vfio/scripts/cleanup.sh-18-\t\tfi\n--\ntools/testing/selftests/vfio/scripts/lib.sh=30=function get_sriov_numvfs() {\n--\ntools/testing/selftests/vfio/scripts/lib.sh-35-\ntools/testing/selftests/vfio/scripts/lib.sh:36:function set_driver_override() {\ntools/testing/selftests/vfio/scripts/lib.sh:37:\twrite_to /sys/bus/pci/devices/${1}/driver_override ${2}\ntools/testing/selftests/vfio/scripts/lib.sh-38-}\ntools/testing/selftests/vfio/scripts/lib.sh-39-\ntools/testing/selftests/vfio/scripts/lib.sh:40:function clear_driver_override() {\ntools/testing/selftests/vfio/scripts/lib.sh:41:\tset_driver_override ${1} \"\"\ntools/testing/selftests/vfio/scripts/lib.sh-42-}\n--\ntools/testing/selftests/vfio/scripts/setup.sh=6=function main() {\n--\ntools/testing/selftests/vfio/scripts/setup.sh-39-\ntools/testing/selftests/vfio/scripts/setup.sh:40:\t\tset_driver_override ${device_bdf} vfio-pci\ntools/testing/selftests/vfio/scripts/setup.sh:41:\t\ttouch ${device_dir}/driver_override\ntools/testing/selftests/vfio/scripts/setup.sh-42-\n" }
41/2	2026/10/01 15:27	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 55856 output: 32 thoughts: 1363 Thoughts: VFIO-PCI Fuzzing Analysis in Syzkaller Okay, let's break this down. I'm trying to figure out if and how syzkaller, our fuzzer, can hit code paths in the `vfio-pci` driver. The obvious starting point is to look at how things are set up in the testing scripts, specifically `tools/testing/selftests/vfio/scripts/setup.sh`. I see `set_driver_override ${device_bdf} vfio-pci` used there. So, the intention is to bind devices to `vfio-pci`. Now, the question is, is this happening in the syzkaller/QEMU environment? It seems not, because syzkaller doesn't explicitly bind any devices to `vfio-pci`, and as a result, the necessary `/dev/vfio/<group>` or `/dev/vfio/devices/vfioX` character devices don't exist. This is a critical issue because without those, the core `vfio-pci` code simply isn't invoked. Even if we were to somehow create or access `/dev/vfio/vfio` inside a container, would it even trigger the execution of code in `drivers/vfio/pci/`? I need to verify which functions are actually called. From my understanding, they are only called when a VFIO device operation is performed on a device that has been bound to `vfio-pci`. Let's check which functions are of interest in `vfio_pci_core.c` and `vfio_pci.c`. 1. `vfio_pci_set_decode` is called, but it's split into `vfio_pci_vga_decode_all` and `vfio_pci_vga_decode_novga`, called by `vfio_pci_vga_init` which is called during `vfio_pci_core_register_device()`, which is called during `probe()`. 2. `vfio_pci_core_runtime_suspend` and `vfio_pci_core_runtime_resume` are related to runtime PM, so that's something to investigate. 3. `vfio_pci_core_register_device()` is called during the driver probe. 4. `vfio_pci_core_aer_err_detected` handles PCI AER errors. 5. In `vfio_pci.c`, `vfio_pci_pm_suspend`, `vfio_pci_pm_resume`, `vfio_pci_aer_err_detected` are defined. 6. Each specific driver's (`mlx5`, `hisi`, etc.) PM and AER callbacks are defined via `VFIO_PCI_CORE_DEFINE_CALLBACKS`. The key question: Can any of these functions be executed in the syzkaller fuzzing environment? 1. `vfio_pci_core_register_device()` is only executed during driver `probe()`. Now, can `probe()` ever execute for `vfio_pci_driver`, or any of the specific driver instances (`mlx5vf_pci_driver`, `hisi_acc_vfio_pci_driver`, etc.)? For the hardware-specific drivers (mlx5, hisi, ism, nvgrace, pds, qat, xe), the answer is no. They require specific physical ASICs that don't exist in standard QEMU or GCE VMs. For `vfio_pci_driver` itself and `virtiovf_pci_driver`, the `pci_device_id` tables have `override_only = PCI_ID_F_VFIO_DRIVER_OVERRIDE`. This means they can only bind to a device if someone explicitly sets `driver_override` in sysfs. And even then, even though QEMU has virtio-net or virtio-blk PCI devices, they bind to `virtio-pci` not `vfio-pci`! Therefore, `probe()` will NEVER be called. What about teardown/remove functions? Teardown callbacks, like those in `nvgrace_gpu_remove` and `ism_vfio_pci_remove`, are only called during physical hot-unplug or manual sysfs driver unbinding. This is clearly a negative criterion. What about PM suspend/resume and AER error handling? `vfio_pci_core_runtime_suspend`/`resume` and `vfio_pci_core_aer_err_detected
42/2	2026/10/01 15:27	tool	grepper	0m Args: { "Expression": "virtio_pci_driver", "PathPrefix": "drivers/virtio/" } Results: { "Output": "drivers/virtio/virtio_pci_common.c=831=static const struct pci_error_handlers virtio_pci_err_handler = {\n--\ndrivers/virtio/virtio_pci_common.c-835-\ndrivers/virtio/virtio_pci_common.c:836:static struct pci_driver virtio_pci_driver = {\ndrivers/virtio/virtio_pci_common.c-837-\t.name\t\t= \"virtio-pci\",\n--\ndrivers/virtio/virtio_pci_common.c=848=struct virtio_device virtio_pci_vf_get_pf_dev(struct pci_dev pdev)\n--\ndrivers/virtio/virtio_pci_common.c-851-\ndrivers/virtio/virtio_pci_common.c:852:\tpf_vp_dev = pci_iov_get_pf_drvdata(pdev, \u0026virtio_pci_driver);\ndrivers/virtio/virtio_pci_common.c-853-\tif (IS_ERR(pf_vp_dev))\n--\ndrivers/virtio/virtio_pci_common.c-858-\ndrivers/virtio/virtio_pci_common.c:859:module_pci_driver(virtio_pci_driver);\ndrivers/virtio/virtio_pci_common.c-860-\n" }
43/2	2026/10/01 15:27	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 58651 output: 42 thoughts: 17 Thoughts: Okay, let's dive into this. Here's my thought process on what I'm looking at: Deconstructing the Virtio PCI Driver Device ID Table Right, let's get down to brass tacks. I need to understand this `virtio_pci_driver` and, specifically, the device ID table it uses. I'm assuming this table is the heart of how this driver identifies and handles the specific PCI devices it's meant to support. It's the critical mapping between hardware and software. I need to analyze its structure, the entries it contains, and how that information is used in the driver's device probing and initialization routines. Understanding this table is fundamental to comprehending the driver's overall behavior and capabilities. It's the key to making this thing work, and understanding how to expand the supported devices.
44/2	2026/10/01 15:27	tool	read-file	0m Args: { "File": "drivers/virtio/virtio_pci_common.c", "FirstLine": 815, "LineCount": 25 } Results: { "Contents": " 815:\t\tstruct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);\n 816:\t\tint ret;\n 817:\t\n 818:\t\tif (pci_is_enabled(pci_dev))\n 819:\t\t\treturn;\n 820:\t\n 821:\t\tret = pci_enable_device(pci_dev);\n 822:\t\tif (!ret) {\n 823:\t\t\tpci_set_master(pci_dev);\n 824:\t\t\tret = virtio_device_reset_done(\u0026vp_dev-\u003evdev);\n 825:\t\t}\n 826:\t\n 827:\t\tif (ret \u0026\u0026 ret != -EOPNOTSUPP)\n 828:\t\t\tdev_warn(\u0026pci_dev-\u003edev, \"Reset done failure: %d\", ret);\n 829:\t}\n 830:\t\n 831:\tstatic const struct pci_error_handlers virtio_pci_err_handler = {\n 832:\t\t.reset_prepare = virtio_pci_reset_prepare,\n 833:\t\t.reset_done = virtio_pci_reset_done,\n 834:\t};\n 835:\t\n 836:\tstatic struct pci_driver virtio_pci_driver = {\n 837:\t\t.name\t\t= \"virtio-pci\",\n 838:\t\t.id_table\t= virtio_pci_id_table,\n 839:\t\t.probe\t\t= virtio_pci_probe,\n" }
45/2	2026/10/01 15:27	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 59314 output: 312 thoughts: 2773 Thoughts: Fuzzing Verdict: WorthFuzzing = False Okay, let's break this down. My initial thought was to quickly assess whether `virtio_pci_driver` was involved, but that's not the critical path here. The more important aspect is determining whether any of the modified functions within `vfio_pci_core.c` or the other drivers are reachable during standard fuzzing, particularly given the core triage philosophy. So, first, I identified the modified functions: `vfio_pci_vga_decode_all`, `vfio_pci_vga_decode_novga`, `vfio_pci_core_runtime_suspend`, `vfio_pci_core_runtime_resume`, `vfio_pci_core_register_device`, and `vfio_pci_core_aer_err_detected`. No changes to `vfio_pci_core_ioctl`, `vfio_pci_core_read`, or `vfio_pci_core_write`, which is a relief. No obvious syscall or ioctl modifications – that's a key negative. Next, I focused on reachability, the primary gate for fuzzing. I meticulously went through the list of modified code, and I see a pattern emerging. `vfio_pci_vga_init()` is static and called only from `vfio_pci_core_register_device()`. The PM ops and AER error handlers are obviously dependent on those events. `vfio_pci_core_register_device()` itself is called by probes: `vfio_pci_probe()`, `virtiovf_pci_probe()`, `mlx5vf_pci_probe()`, `hisi_acc_vfio_pci_probe()`, and so on. The critical realization? All these probes, and the modified functions they call, involve either vendor-specific ASICs or manual intervention. `mlx5`, `pds`, `nvgrace-gpu`, `xe`, `qat`, `hisi_acc` are all physical hardware, and that means we are dealing with structurally unreachable code, code that is not emulated in standard QEMU. Furthermore, `ism` is s390 architecture-exclusive. The "override_only" flag on `vfio_pci` and `virtiovf` is another huge red flag, indicating manual sysfs binding. The `.remove` functions are only called during driver unbinding. Looking at the core triage philosophy, it's clear: These drivers – `pds_vfio`, `mlx5`, `nvgrace-gpu`, `xe`, `qat`, `hisi_acc`, `ism`, `virtio`, `vfio_pci` – all fall into the "structurally unreachable hardware" category and "unreachable execution paths". The example list in the instructions makes it even clearer. `pds_core`, `mlxsw`, and `amdgpu` are literally listed as examples of unfuzzable hardware! The drivers are all either for physical hardware not emulated in QEMU, or they require manual intervention or a specific architecture. I double-checked to see if syzkaller, running QEMU/GCE on amd64, could even conceivably execute any of this code. No. It can't write to `driver_override`, and even if it could, no IOMMU, no dice. This is cut and dried. Therefore: * WorthFuzzing: false * FocusSymbols: \[\] * EnableConfigs: \[\] * Reasoning: The patch primarily refactors driver data retrieval, PM, and AER handling in drivers for physical, vendor-specific ASICs (ConnectX, Pensando, NVIDIA Grace, Intel Xe, Intel QAT, HiSilicon), not emulated in standard QEMU/GCE, or s390 architecture-exclusive hardware. Drivers using "override_only" (virtio VF) are unreachable without manual `driver_override`. The changes specifically target structurally unreachable hardware and execution paths.
46/2	2026/10/01 15:27	tool	set-results	0m Args: { "EnableConfigs": [], "FocusSymbols": [], "Reasoning": "The patch series refactors drvdata management, runtime PM callbacks, and AER error handling across the VFIO PCI subsystem and its variant drivers (mlx5, hisi_acc, ism, nvgrace-gpu, pds, qat, xe, and virtiovf).\n\nAll modified code is structurally unreachable in standard virtualized fuzzing environments (QEMU/GCE on amd64):\n1. The specialized VFIO drivers (mlx5, pds, nvgrace-gpu, xe, qat, hisi_acc) require physical vendor-specific ASICs (Mellanox ConnectX, Pensando DSC, NVIDIA Grace GPU, Intel Xe GPU, Intel QAT, HiSilicon Kunpeng) not emulated in standard QEMU, or are s390-specific (IBM ISM).\n2. The generic vfio-pci driver and virtio-vfio-pci driver specify PCI_DRIVER_OVERRIDE_DEVICE_VFIO (PCI_ID_F_VFIO_DRIVER_OVERRIDE), meaning they do not bind to any emulated PCI device at boot and can only be attached via manual sysfs driver_override configuration.\n3. The affected callbacks (.probe, .remove, PM suspend/resume, and AER error handling) cannot be exercised during standard syzkaller fuzzing runs.", "WorthFuzzing": false } Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch series refactors drvdata management, runtime PM callbacks, and AER error handling across the VFIO PCI subsystem and its variant drivers (mlx5, hisi_acc, ism, nvgrace-gpu, pds, qat, xe, and virtiovf).\n\nAll modified code is structurally unreachable in standard virtualized fuzzing environments (QEMU/GCE on amd64):\n1. The specialized VFIO drivers (mlx5, pds, nvgrace-gpu, xe, qat, hisi_acc) require physical vendor-specific ASICs (Mellanox ConnectX, Pensando DSC, NVIDIA Grace GPU, Intel Xe GPU, Intel QAT, HiSilicon Kunpeng) not emulated in standard QEMU, or are s390-specific (IBM ISM).\n2. The generic vfio-pci driver and virtio-vfio-pci driver specify PCI_DRIVER_OVERRIDE_DEVICE_VFIO (PCI_ID_F_VFIO_DRIVER_OVERRIDE), meaning they do not bind to any emulated PCI device at boot and can only be attached via manual sysfs driver_override configuration.\n3. The affected callbacks (.probe, .remove, PM suspend/resume, and AER error handling) cannot be exercised during standard syzkaller fuzzing runs.", "WorthFuzzing": false }
47/1	2026/10/01 15:27	action	If	0m Args: { "WorthFuzzing": false } Results: null

LLM Calls Summary:
Total Calls	Total Tokens	Avg Tokens	Total Duration (Seconds)	Avg Duration (Seconds)

Tool Calls Summary:
Total Calls	Total Duration (Seconds)	Avg Duration (Seconds)