AI Trajectory

null

{
  "EnableConfigs": [
    "VFIO",
    "VFIO_PCI",
    "PCI_IOV"
  ],
  "FocusSymbols": [
    "vfio_pci_core_close_device",
    "vfio_pci_core_sriov_configure"
  ],
  "Reasoning": "The patch adds a functional change to disable SR-IOV VFs when a VFIO PCI device is closed. This is reachable in virtualized environments by binding a virtual PCI device to vfio-pci, enabling VFs, and closing the device.",
  "WorthFuzzing": true
}

null

{
  "PatchDiff": "commit 1038b5c2958466398a013488ce451a51b08db2d7\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Wed Aug 5 00:39:31 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c\nindex a113c55845e10..b36c77eb3c407 100644\n--- a/drivers/vfio/pci/vfio_pci_core.c\n+++ b/drivers/vfio/pci/vfio_pci_core.c\n@@ -826,6 +826,13 @@ void vfio_pci_core_close_device(struct vfio_device *core_vdev)\n #if IS_ENABLED(CONFIG_EEH)\n \teeh_dev_release(vdev-\u003epdev);\n #endif\n+\n+\tif (pci_num_vf(vdev-\u003epdev)) {\n+\t\tdevice_lock(\u0026vdev-\u003epdev-\u003edev);\n+\t\tvfio_pci_core_sriov_configure(vdev, 0);\n+\t\tdevice_unlock(\u0026vdev-\u003epdev-\u003edev);\n+\t}\n+\n \tvfio_pci_dma_buf_cleanup(vdev);\n \n \tvfio_pci_core_disable(vdev);\n"
}

best-expensive

null

{
  "EnableConfigs": [
    "VFIO",
    "VFIO_PCI",
    "PCI_IOV"
  ],
  "FocusSymbols": [
    "vfio_pci_core_close_device",
    "vfio_pci_core_sriov_configure"
  ],
  "Reasoning": "The patch adds a functional change to disable SR-IOV VFs when a VFIO PCI device is closed. This is reachable in virtualized environments by binding a virtual PCI device to vfio-pci, enabling VFs, and closing the device.",
  "WorthFuzzing": true
}

You are an expert Linux kernel maintainer.
Your job is to review a provided patch series and determine
if it makes functional changes to the kernel that should be fuzzed.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively
use your code access tools to examine the actual source code and confirm any assumptions.

Return WorthFuzzing=false if the patch only contains:
- Modifications to Documentation/, Kconfig files, or code comments.
- Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints.
- Changes to numeric constants or macros that do not functionally alter execution flow.
- Code paths that are impossible to reach in virtualized environments like GCE or QEMU,
  even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim).
- Code in vendor-specific PCIe switch, SmartNIC, or GPU drivers (e.g., mlxsw, pds_core, qed,
  ionic, amdgpu) that require physical PCIe hardware cards not emulated in standard QEMU.
- Driver .remove, .shutdown, or pci_unregister_driver teardown callbacks (e.g., igb_remove)
  that are executed only during PCI hot-unplug or sysfs driver unbind operations.

If it modifies reachable core kernel logic, drivers, or architectures, use your code search
tools to verify the code can be executed, then return WorthFuzzing=true.

When returning WorthFuzzing=true, you MUST ALSO:
1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols.
   Avoid listing generic hot-path functions to prevent skewed test distributions.
   Prefer non-static, non-inlined API entrypoint functions over internal static helper functions
   (which are inlined by the compiler and do not have distinct symbol addresses).
2. Identify any specific CONFIG_ options required to properly test this new/modified feature.
   Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions.
   Also check "depends on" lines in Kconfig to include any non-standard parent subsystem configs
   needed for Kbuild to compile the code statically into vmlinux. List them in the EnableConfigs
   output array, and DO NOT add a '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.

For your convenience, here is the diff of the changes:
commit 1038b5c2958466398a013488ce451a51b08db2d7
Author: syz-cluster <triage@syzkaller.com>
Date:   Wed Aug 5 00:39:31 2026 +0000

    syz-cluster: applied patch under review

diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
index a113c55845e10..b36c77eb3c407 100644
--- a/drivers/vfio/pci/vfio_pci_core.c
+++ b/drivers/vfio/pci/vfio_pci_core.c
@@ -826,6 +826,13 @@ void vfio_pci_core_close_device(struct vfio_device *core_vdev)
 #if IS_ENABLED(CONFIG_EEH)
 	eeh_dev_release(vdev->pdev);
 #endif
+
+	if (pci_num_vf(vdev->pdev)) {
+		device_lock(&vdev->pdev->dev);
+		vfio_pci_core_sriov_configure(vdev, 0);
+		device_unlock(&vdev->pdev->dev);
+	}
+
 	vfio_pci_dma_buf_cleanup(vdev);
 
 	vfio_pci_core_disable(vdev);

gemini-3.1-pro-preview

null

null

							input: 2154
							output: 31
							thoughts: 250
						

**Analyzing a VFIO-PCI Driver Patch**

Okay, so I'm looking at a patch that tweaks `drivers/vfio/pci/vfio_pci_core.c`. It seems they're adding a call to `vfio_pci_core_sriov_configure(vdev, 0)` within `vfio_pci_core_close_device`, but only if the number of Virtual Functions (VFs) associated with the PCI device (`vdev->pdev`) is greater than zero. This is core VFIO-PCI driver territory, which, as we know, provides the crucial interface for userspace access to devices.

The function being modified, `vfio_pci_core_close_device`, is invoked when a VFIO device is being closed. The key question, as always, is whether this code path is actually *reachable* in a practical scenario, particularly in a virtualized context. We know VFIO-PCI typically expects an IOMMU and physical devices, but there are definitely exceptions like `vfio-mdev` or `vfio-pci` configurations that can work with emulated hardware or mock IOMMUs. So, yes, it’s plausible.

Now, the real question – is this *fuzzable*? Can we trigger this path with fuzzing? I need to check. Let's see... I seem to recall Syzkaller having some VFIO descriptions, which is a good sign. We know that `vfio_pci_core_close_device` is being triggered on a close event, so now I need to check if the code path is reachable by checking the test cases in Syzkaller.

{
  "Expression": "vfio_pci_core_close_device",
  "PathPrefix": ""
}

{
  "Output": "drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c=1542=static void hisi_acc_vfio_pci_close_device(struct vfio_device *core_vdev)\n--\ndrivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c-1552-\tmutex_unlock(\u0026hisi_acc_vdev-\u003eopen_mutex);\ndrivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c:1553:\tvfio_pci_core_close_device(core_vdev);\ndrivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c-1554-}\n--\ndrivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c=1602=static const struct vfio_device_ops hisi_acc_vfio_pci_ops = {\n--\ndrivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c-1606-\t.open_device = hisi_acc_vfio_pci_open_device,\ndrivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c:1607:\t.close_device = vfio_pci_core_close_device,\ndrivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c-1608-\t.ioctl = vfio_pci_core_ioctl,\n--\ndrivers/vfio/pci/ism/main.c=335=static const struct vfio_device_ops ism_pci_ops = {\n--\ndrivers/vfio/pci/ism/main.c-339-\t.open_device = ism_vfio_pci_open_device,\ndrivers/vfio/pci/ism/main.c:340:\t.close_device = vfio_pci_core_close_device,\ndrivers/vfio/pci/ism/main.c-341-\t.ioctl = vfio_pci_core_ioctl,\n--\ndrivers/vfio/pci/mlx5/main.c=1340=static void mlx5vf_pci_close_device(struct vfio_device *core_vdev)\n--\ndrivers/vfio/pci/mlx5/main.c-1345-\tmlx5vf_cmd_close_migratable(mvdev);\ndrivers/vfio/pci/mlx5/main.c:1346:\tvfio_pci_core_close_device(core_vdev);\ndrivers/vfio/pci/mlx5/main.c-1347-}\n--\ndrivers/vfio/pci/nvgrace-gpu/main.c=227=static void nvgrace_gpu_close_device(struct vfio_device *core_vdev)\n--\ndrivers/vfio/pci/nvgrace-gpu/main.c-253-\ndrivers/vfio/pci/nvgrace-gpu/main.c:254:\tvfio_pci_core_close_device(core_vdev);\ndrivers/vfio/pci/nvgrace-gpu/main.c-255-}\n--\ndrivers/vfio/pci/nvgrace-gpu/main.c=1090=static const struct vfio_device_ops nvgrace_gpu_pci_core_ops = {\n--\ndrivers/vfio/pci/nvgrace-gpu/main.c-1094-\t.open_device\t= nvgrace_gpu_open_device,\ndrivers/vfio/pci/nvgrace-gpu/main.c:1095:\t.close_device\t= vfio_pci_core_close_device,\ndrivers/vfio/pci/nvgrace-gpu/main.c-1096-\t.ioctl\t\t= vfio_pci_core_ioctl,\n--\ndrivers/vfio/pci/pds/vfio_dev.c=177=static void pds_vfio_close_device(struct vfio_device *vdev)\n--\ndrivers/vfio/pci/pds/vfio_dev.c-187-\tmutex_unlock(\u0026pds_vfio-\u003estate_mutex);\ndrivers/vfio/pci/pds/vfio_dev.c:188:\tvfio_pci_core_close_device(vdev);\ndrivers/vfio/pci/pds/vfio_dev.c-189-}\n--\ndrivers/vfio/pci/qat/main.c=106=static void qat_vf_pci_close_device(struct vfio_device *core_vdev)\n--\ndrivers/vfio/pci/qat/main.c-112-\tqat_vf_disable_fds(qat_vdev);\ndrivers/vfio/pci/qat/main.c:113:\tvfio_pci_core_close_device(core_vdev);\ndrivers/vfio/pci/qat/main.c-114-}\n--\ndrivers/vfio/pci/vfio_pci.c=149=static const struct vfio_device_ops vfio_pci_ops = {\n--\ndrivers/vfio/pci/vfio_pci.c-153-\t.open_device\t= vfio_pci_open_device,\ndrivers/vfio/pci/vfio_pci.c:154:\t.close_device\t= vfio_pci_core_close_device,\ndrivers/vfio/pci/vfio_pci.c-155-\t.ioctl\t\t= vfio_pci_core_ioctl,\n--\ndrivers/vfio/pci/vfio_pci_core.c=813=EXPORT_SYMBOL_GPL(vfio_pci_core_disable);\ndrivers/vfio/pci/vfio_pci_core.c-814-\ndrivers/vfio/pci/vfio_pci_core.c:815:void vfio_pci_core_close_device(struct vfio_device *core_vdev)\ndrivers/vfio/pci/vfio_pci_core.c-816-{\n--\ndrivers/vfio/pci/vfio_pci_core.c-844-}\ndrivers/vfio/pci/vfio_pci_core.c:845:EXPORT_SYMBOL_GPL(vfio_pci_core_close_device);\ndrivers/vfio/pci/vfio_pci_core.c-846-\n--\ndrivers/vfio/pci/virtio/main.c=45=static void virtiovf_pci_close_device(struct vfio_device *core_vdev)\n--\ndrivers/vfio/pci/virtio/main.c-50-\tvirtiovf_close_migration(virtvdev);\ndrivers/vfio/pci/virtio/main.c:51:\tvfio_pci_core_close_device(core_vdev);\ndrivers/vfio/pci/virtio/main.c-52-}\n--\ndrivers/vfio/pci/virtio/main.c=128=static const struct vfio_device_ops virtiovf_vfio_pci_ops = {\n--\ndrivers/vfio/pci/virtio/main.c-132-\t.open_device = virtiovf_pci_open_device,\ndrivers/vfio/pci/virtio/main.c:133:\t.close_device = vfio_pci_core_close_device,\ndrivers/vfio/pci/virtio/main.c-134-\t.ioctl = vfio_pci_core_ioctl,\n--\ndrivers/vfio/pci/xe/main.c=164=static void xe_vfio_pci_close_device(struct vfio_device *core_vdev)\n--\ndrivers/vfio/pci/xe/main.c-171-\txe_vfio_pci_state_mutex_unlock(xe_vdev);\ndrivers/vfio/pci/xe/main.c:172:\tvfio_pci_core_close_device(core_vdev);\ndrivers/vfio/pci/xe/main.c-173-}\n--\ninclude/linux/vfio_pci_core.h=162=int vfio_pci_core_register_dev_region(struct vfio_pci_core_device *vdev,\n--\ninclude/linux/vfio_pci_core.h-165-\t\t\t\t      size_t size, u32 flags, void *data);\ninclude/linux/vfio_pci_core.h:166:void vfio_pci_core_close_device(struct vfio_device *core_vdev);\ninclude/linux/vfio_pci_core.h-167-int vfio_pci_core_init_dev(struct vfio_device *core_vdev);\n"
}

gemini-3.1-pro-preview

null

null

							input: 5071
							output: 33
							thoughts: 226
						

**VFIO PCI and Syzkaller: A Quick Assessment**

Okay, so `vfio_pci_core_close_device` is a key function, exported and used all over the place by these VFIO PCI drivers, even within `vfio_pci.c` itself. The real question is, can I even *reach* `vfio_pci` through Syzkaller?

Syzkaller does have `sys/linux/vfio.txt`, so at least it *knows* about the VFIO ioctls. But hold on, for VFIO PCI, I need a PCI device, right? Syzkaller uses `vhci`, `vkms`, and `vnet`… Does it have some kind of virtual PCI device that can actually be bound to VFIO? Now, I do remember seeing the `vfio-pci` driver. So, can Syzkaller bind a device to that?

Let me see… Yeah, it does have `syz_kvm_setup_cpu` and other related setup routines. But for VFIO specifically, it looks like it can open `/dev/vfio/vfio` and `/dev/vfio/X`. That's a good sign! Next step, I need to check if `vfio_pci_core_sriov_configure` is reachable, and then I'll see if I can get this all working.

{
  "Expression": "vfio_pci_core_sriov_configure",
  "PathPrefix": ""
}

{
  "Output": "drivers/vfio/pci/vfio_pci.c=209=static int vfio_pci_sriov_configure(struct pci_dev *pdev, int nr_virtfn)\n--\ndrivers/vfio/pci/vfio_pci.c-215-\ndrivers/vfio/pci/vfio_pci.c:216:\treturn vfio_pci_core_sriov_configure(vdev, nr_virtfn);\ndrivers/vfio/pci/vfio_pci.c-217-}\n--\ndrivers/vfio/pci/vfio_pci_core.c=53=int vfio_pci_eventfd_replace_locked(struct vfio_pci_core_device *vdev,\n--\ndrivers/vfio/pci/vfio_pci_core.c-77-\ndrivers/vfio/pci/vfio_pci_core.c:78:/* List of PF's that vfio_pci_core_sriov_configure() has been called on */\ndrivers/vfio/pci/vfio_pci_core.c-79-static DEFINE_MUTEX(vfio_pci_sriov_pfs_mutex);\n--\ndrivers/vfio/pci/vfio_pci_core.c=815=void vfio_pci_core_close_device(struct vfio_device *core_vdev)\n--\ndrivers/vfio/pci/vfio_pci_core.c-831-\t\tdevice_lock(\u0026vdev-\u003epdev-\u003edev);\ndrivers/vfio/pci/vfio_pci_core.c:832:\t\tvfio_pci_core_sriov_configure(vdev, 0);\ndrivers/vfio/pci/vfio_pci_core.c-833-\t\tdevice_unlock(\u0026vdev-\u003epdev-\u003edev);\n--\ndrivers/vfio/pci/vfio_pci_core.c=2099=static int vfio_pci_vf_init(struct vfio_pci_core_device *vdev)\n--\ndrivers/vfio/pci/vfio_pci_core.c-2107-\t\t/*\ndrivers/vfio/pci/vfio_pci_core.c:2108:\t\t * If this VF was created by our vfio_pci_core_sriov_configure()\ndrivers/vfio/pci/vfio_pci_core.c-2109-\t\t * then we can find the PF vfio_pci_core_device now, and due to\n--\ndrivers/vfio/pci/vfio_pci_core.c=2326=void vfio_pci_core_unregister_device(struct vfio_pci_core_device *vdev)\ndrivers/vfio/pci/vfio_pci_core.c-2327-{\ndrivers/vfio/pci/vfio_pci_core.c:2328:\tvfio_pci_core_sriov_configure(vdev, 0);\ndrivers/vfio/pci/vfio_pci_core.c-2329-\n--\ndrivers/vfio/pci/vfio_pci_core.c=2356=EXPORT_SYMBOL_GPL(vfio_pci_core_aer_err_detected);\ndrivers/vfio/pci/vfio_pci_core.c-2357-\ndrivers/vfio/pci/vfio_pci_core.c:2358:int vfio_pci_core_sriov_configure(struct vfio_pci_core_device *vdev,\ndrivers/vfio/pci/vfio_pci_core.c-2359-\t\t\t\t  int nr_virtfn)\n--\ndrivers/vfio/pci/vfio_pci_core.c-2425-}\ndrivers/vfio/pci/vfio_pci_core.c:2426:EXPORT_SYMBOL_GPL(vfio_pci_core_sriov_configure);\ndrivers/vfio/pci/vfio_pci_core.c-2427-\n--\ninclude/linux/vfio_pci_core.h=171=extern const struct pci_error_handlers vfio_pci_core_err_handlers;\ninclude/linux/vfio_pci_core.h:172:int vfio_pci_core_sriov_configure(struct vfio_pci_core_device *vdev,\ninclude/linux/vfio_pci_core.h-173-\t\t\t\t  int nr_virtfn);\n"
}

gemini-3.1-pro-preview

null

null

							input: 6806
							output: 26
							thoughts: 134
						

**VFIO PCI SRIOV Disablement on Close**

Okay, so this patch seems to be addressing SRIOV configuration within the VFIO PCI core. Specifically, it's adding a call to `vfio_pci_core_sriov_configure(vdev, 0)` in `vfio_pci_core_close_device`. The logic here is straightforward: If the physical device (`pdev`) associated with the virtual device (`vdev`) has any virtual functions (VFs) enabled (checked via `pci_num_vf(vdev->pdev)`), then SRIOV is explicitly disabled during the device close procedure. This clearly represents a functional change to the driver's behavior.

Now, my mind immediately jumps to fuzzing. I'm always thinking about vulnerability research. Is this VFIO PCI code path fuzzable with syzkaller? We know there are `syz_kvm_setup_cpu` and `syz_kvm_setup_vm` calls in syzkaller, which deal with KVM. But, what about VFIO? I need to quickly check if syzkaller has any dedicated descriptions or support for VFIO system calls. This would be a good place to start, if there are, as the patch focuses on this SRIOV configuration and closing the device, both potential fuzzing targets.

no matches

{
  "Expression": "syz_.*vfio",
  "PathPrefix": ""
}

{
  "error": "no matches"
}

gemini-3.1-pro-preview

null

null

							input: 7265
							output: 25
							thoughts: 301
						

**Analyzing VFIO Reachability in Virtualized Environments**

Okay, so I'm trying to figure out how to determine if something is reachable through VFIO, particularly in a virtualized context. I've got a bit of a roadblock: I can't use `syz_` with grepper because those are Syzkaller pseudo-syscalls and not actual kernel calls. But that's fine; I'm not looking at Syzkaller descriptions right now. I just need to figure out VFIO reachability.

The prompt notes `vfio` use with virtual devices. I know that `vfio-mdev` or `vfio-pci` with a virtual PCI device are possibilities. However, `vfio-pci` typically binds to a *physical* PCI device, right? But then, in QEMU, we *do* have virtual PCI devices like `e1000` and `virtio-net-pci`. Hmm... can you bind a *virtual* PCI device to `vfio-pci`?

Ah, yes, of course! You can if the kernel boots with `iommu=pt` or `intel_iommu=on` and the QEMU machine has a vIOMMU, or if `vfio` is used with `noiommu` mode. That's the key. I need to make sure the environment is configured correctly.

Wait a second... Syzkaller actually *does* test VFIO! I should check the syzkaller documentation or source code for examples. Still, I might need to confirm the presence of `CONFIG_VFIO_PCI` as a config option. Let me check the config options.

{
  "Expression": "config VFIO_PCI",
  "PathPrefix": ""
}

{
  "Output": "drivers/vfio/pci/Kconfig=2=menu \"VFIO support for PCI devices\"\n--\ndrivers/vfio/pci/Kconfig-4-\ndrivers/vfio/pci/Kconfig:5:config VFIO_PCI_CORE\ndrivers/vfio/pci/Kconfig-6-\ttristate\n--\ndrivers/vfio/pci/Kconfig-9-\ndrivers/vfio/pci/Kconfig:10:config VFIO_PCI_INTX\ndrivers/vfio/pci/Kconfig-11-\tdef_bool y if !S390\n--\ndrivers/vfio/pci/Kconfig-13-\ndrivers/vfio/pci/Kconfig:14:config VFIO_PCI\ndrivers/vfio/pci/Kconfig-15-\ttristate \"Generic VFIO support for any PCI device\"\n--\ndrivers/vfio/pci/Kconfig=23=if VFIO_PCI\ndrivers/vfio/pci/Kconfig:24:config VFIO_PCI_VGA\ndrivers/vfio/pci/Kconfig-25-\tbool \"Generic VFIO PCI support for VGA devices\"\n--\ndrivers/vfio/pci/Kconfig-33-\ndrivers/vfio/pci/Kconfig:34:config VFIO_PCI_IGD\ndrivers/vfio/pci/Kconfig-35-\tbool \"Generic VFIO PCI extensions for Intel graphics (GVT-d)\"\n--\ndrivers/vfio/pci/Kconfig=45=endif\ndrivers/vfio/pci/Kconfig-46-\ndrivers/vfio/pci/Kconfig:47:config VFIO_PCI_ZDEV_KVM\ndrivers/vfio/pci/Kconfig-48-\tbool \"VFIO PCI extensions for s390x KVM passthrough\"\n--\ndrivers/vfio/pci/Kconfig-57-\ndrivers/vfio/pci/Kconfig:58:config VFIO_PCI_DMABUF\ndrivers/vfio/pci/Kconfig-59-\tdef_bool y if VFIO_PCI_CORE \u0026\u0026 PCI_P2PDMA \u0026\u0026 DMA_SHARED_BUFFER\n"
}

gemini-3.1-pro-preview

null

null

							input: 8491
							output: 36
							thoughts: 20
						

Okay, let's dive into this. Here's my thought process on the matter:

**Analyzing the VFIO PCI Driver Dependencies**

Alright, before I go any further, I need to get a clear picture of the landscape for this VFIO PCI driver stuff. The smart move here is to consult the `drivers/vfio/pci/Kconfig` file. That's the go-to location for understanding the dependencies and configuration options. It'll lay out precisely what other kernel components or features need to be in place for this driver to function correctly. I'm especially keen to see how it interacts with the rest of the VFIO subsystem and any hardware-specific prerequisites. This Kconfig file will be the Rosetta Stone for figuring out what I need to consider for this project.

{
  "File": "drivers/vfio/pci/Kconfig",
  "FirstLine": 1,
  "LineCount": 30
}

{
  "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"
}

gemini-3.1-pro-preview

null

null

							input: 9105
							output: 25
							thoughts: 431
						

**VFIO PCI Device Closure and SR-IOV Configuration - Fuzzing Potential**

Okay, so this patch is modifying `vfio_pci_core_close_device`, which is within the `VFIO_PCI_CORE` module. The added code block... let me see...

```c
	if (pci_num_vf(vdev->pdev)) {
		device_lock(&vdev->pdev->dev);
		vfio_pci_core_sriov_configure(vdev, 0);
		device_unlock(&vdev->pdev->dev);
	}
```

...is only reachable if a VFIO PCI device is being closed and *it* has Virtual Functions (VFs). `pci_num_vf`... right, that returns the number of VFs. This implies an SR-IOV capable PCI device. Now, the question is, can we *trigger* this?

QEMU can emulate SR-IOV for certain devices, like `igb` or `nvme`, so that shouldn't be a blocker. So, if syzkaller can bind an SR-IOV-capable device to `vfio-pci`, enable the VFs, and then close the device, we could be looking at a viable fuzz target. I also need to be sure the function `vfio_pci_core_sriov_configure` is called when VFs are enabled through the sysfs. If this configuration happens, then closes the device, this code will be executed.

Is this worth fuzzing? Absolutely. This is a functional change in core VFIO PCI logic. It's fixing a potential bug where VFs might be left enabled when the device is closed, so we could be looking at a critical path.

So, the key symbols here are `vfio_pci_core_close_device` and `vfio_pci_core_sriov_configure`. The necessary configs seem to be `VFIO_PCI` and `PCI`. I should double check if `PCI` is enough, or if we need `PCI_IOV` to enable the `pci_num_vf` function. I will need to be certain.

{
  "Expression": "config PCI_IOV",
  "PathPrefix": ""
}

{
  "Output": "drivers/pci/Kconfig=154=config PCI_BRIDGE_EMUL\n--\ndrivers/pci/Kconfig-156-\ndrivers/pci/Kconfig:157:config PCI_IOV\ndrivers/pci/Kconfig-158-\tbool \"PCI IOV support\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 10128
							output: 35
							thoughts: 20
						

Here's a summary of my thought process, as requested:

**PCI IOV Configuration Exploration**

Okay, so I need to figure out how `PCI_IOV` is configured within the kernel. My first instinct, and the most logical place to start, is the `Kconfig` file within the PCI drivers directory. Specifically, I'll navigate to `drivers/pci/Kconfig`. This file should contain the conditional logic and dependencies that define how `PCI_IOV` is exposed as a configuration option. I'm looking for the relevant `config` statement, any associated `depends on` clauses, and maybe even a brief description explaining its purpose. Knowing this information will give me a solid foundation for understanding the kernel's virtual function implementation.

{
  "File": "drivers/pci/Kconfig",
  "FirstLine": 150,
  "LineCount": 20
}

{
  "Contents": " 150:\t\n 151:\tconfig PCI_LOCKLESS_CONFIG\n 152:\t\tbool\n 153:\t\n 154:\tconfig PCI_BRIDGE_EMUL\n 155:\t\tbool\n 156:\t\n 157:\tconfig PCI_IOV\n 158:\t\tbool \"PCI IOV support\"\n 159:\t\tselect PCI_ATS\n 160:\t\thelp\n 161:\t\t  I/O Virtualization is a PCI feature supported by some devices\n 162:\t\t  which allows them to create virtual devices which share their\n 163:\t\t  physical resources.\n 164:\t\n 165:\t\t  If unsure, say N.\n 166:\t\n 167:\tconfig PCI_NPEM\n 168:\t\tbool \"Native PCIe Enclosure Management\"\n 169:\t\tdepends on LEDS_CLASS=y\n"
}

gemini-3.1-pro-preview

null

null

							input: 10585
							output: 26
							thoughts: 40
						

Okay, here's my interpretation of those thoughts, summarized from my perspective as an expert in the field:

**SR-IOV and Its Requirements**

Alright, the core issue is SR-IOV support. My gut tells me that to get this functionality up and running, `PCI_IOV` is going to be essential. No real surprises there. Now, before I proceed with any further investigation, I need to verify a fundamental dependency. I'll need to confirm what happens if `pci_num_vf` is defined without `PCI_IOV`. I need to ensure I have a good grasp of the control flow.

{
  "Expression": "pci_num_vf",
  "PathPrefix": ""
}

{
  "Output": "\nFull output is too long, showing 500 out of 640 lines.\nUse more precise expression if possible.\n\narch/powerpc/platforms/pseries/eeh_pseries.c=724=static int pseries_call_allow_unfreeze(struct eeh_dev *edev)\n--\narch/powerpc/platforms/pseries/eeh_pseries.c-732-\t\treturn -ENOMEM;\narch/powerpc/platforms/pseries/eeh_pseries.c:733:\tif (pci_num_vf(edev-\u003ephysfn ? edev-\u003ephysfn : edev-\u003epdev)) {\narch/powerpc/platforms/pseries/eeh_pseries.c-734-\t\tif (edev-\u003epdev-\u003eis_physfn) {\narch/powerpc/platforms/pseries/eeh_pseries.c:735:\t\t\tcur_vfs = pci_num_vf(edev-\u003epdev);\narch/powerpc/platforms/pseries/eeh_pseries.c-736-\t\t\tpdn = eeh_dev_to_pdn(edev);\n--\ndrivers/accel/amdxdna/aie4_sriov.c=42=int aie4_sriov_stop(struct amdxdna_dev_hdl *ndev)\n--\ndrivers/accel/amdxdna/aie4_sriov.c-47-\ndrivers/accel/amdxdna/aie4_sriov.c:48:\tif (!pci_num_vf(pdev))\ndrivers/accel/amdxdna/aie4_sriov.c-49-\t\treturn 0;\n--\ndrivers/crypto/cavium/nitrox/nitrox_sriov.c=153=static int nitrox_sriov_enable(struct pci_dev *pdev, int num_vfs)\n--\ndrivers/crypto/cavium/nitrox/nitrox_sriov.c-162-\ndrivers/crypto/cavium/nitrox/nitrox_sriov.c:163:\tif (pci_num_vf(pdev) == num_vfs)\ndrivers/crypto/cavium/nitrox/nitrox_sriov.c-164-\t\treturn num_vfs;\n--\ndrivers/crypto/hisilicon/qm.c=4286=int hisi_qm_sriov_enable(struct pci_dev *pdev, int max_vfs)\n--\ndrivers/crypto/hisilicon/qm.c-4295-\ttotal_vfs = pci_sriov_get_totalvfs(pdev);\ndrivers/crypto/hisilicon/qm.c:4296:\tpre_existing_vfs = pci_num_vf(pdev);\ndrivers/crypto/hisilicon/qm.c-4297-\tif (pre_existing_vfs) {\n--\ndrivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c=13=void adf_pf2vf_notify_restarting(struct adf_accel_dev *accel_dev)\n--\ndrivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c-16-\tstruct pfvf_message msg = { .type = ADF_PF2VF_MSGTYPE_RESTARTING };\ndrivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c:17:\tint i, num_vfs = pci_num_vf(accel_to_pci_dev(accel_dev));\ndrivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c-18-\n--\ndrivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c=35=void adf_pf2vf_wait_for_restarting_complete(struct adf_accel_dev *accel_dev)\ndrivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c-36-{\ndrivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c:37:\tint num_vfs = pci_num_vf(accel_to_pci_dev(accel_dev));\ndrivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c-38-\tint i, retries = ADF_VF_SHUTDOWN_RETRY;\n--\ndrivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c=57=void adf_pf2vf_notify_restarted(struct adf_accel_dev *accel_dev)\n--\ndrivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c-59-\tstruct pfvf_message msg = { .type = ADF_PF2VF_MSGTYPE_RESTARTED };\ndrivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c:60:\tint i, num_vfs = pci_num_vf(accel_to_pci_dev(accel_dev));\ndrivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c-61-\tstruct adf_accel_vf_info *vf;\n--\ndrivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c=72=void adf_pf2vf_notify_fatal_error(struct adf_accel_dev *accel_dev)\n--\ndrivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c-74-\tstruct pfvf_message msg = { .type = ADF_PF2VF_MSGTYPE_FATAL_ERROR };\ndrivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c:75:\tint i, num_vfs = pci_num_vf(accel_to_pci_dev(accel_dev));\ndrivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c-76-\tstruct adf_accel_vf_info *vf;\n--\ndrivers/crypto/intel/qat/qat_common/adf_sriov.c=66=static int adf_enable_sriov(struct adf_accel_dev *accel_dev)\n--\ndrivers/crypto/intel/qat/qat_common/adf_sriov.c-94-\t/* Do not enable SR-IOV if already enabled */\ndrivers/crypto/intel/qat/qat_common/adf_sriov.c:95:\tif (pci_num_vf(pdev))\ndrivers/crypto/intel/qat/qat_common/adf_sriov.c-96-\t\treturn 0;\n--\ndrivers/crypto/marvell/octeontx2/otx2_cptpf_main.c=648=static int cptpf_sriov_disable(struct pci_dev *pdev)\n--\ndrivers/crypto/marvell/octeontx2/otx2_cptpf_main.c-650-\tstruct otx2_cptpf_dev *cptpf = pci_get_drvdata(pdev);\ndrivers/crypto/marvell/octeontx2/otx2_cptpf_main.c:651:\tint num_vfs = pci_num_vf(pdev);\ndrivers/crypto/marvell/octeontx2/otx2_cptpf_main.c-652-\n--\ndrivers/gpu/drm/xe/xe_pci.c=1363=static int xe_pci_runtime_suspend(struct device *dev)\n--\ndrivers/gpu/drm/xe/xe_pci.c-1375-\txe_assert(xe, !IS_SRIOV_VF(xe));\ndrivers/gpu/drm/xe/xe_pci.c:1376:\txe_assert(xe, !pci_num_vf(pdev));\ndrivers/gpu/drm/xe/xe_pci.c-1377-\n--\ndrivers/gpu/drm/xe/xe_pci_sriov.c=176=static int pf_disable_vfs(struct xe_device *xe)\n--\ndrivers/gpu/drm/xe/xe_pci_sriov.c-179-\tstruct pci_dev *pdev = to_pci_dev(dev);\ndrivers/gpu/drm/xe/xe_pci_sriov.c:180:\tu16 num_vfs = pci_num_vf(pdev);\ndrivers/gpu/drm/xe/xe_pci_sriov.c-181-\n--\ndrivers/gpu/drm/xe/xe_pci_sriov.c=221=int xe_pci_sriov_configure(struct pci_dev *pdev, int num_vfs)\n--\ndrivers/gpu/drm/xe/xe_pci_sriov.c-233-\ndrivers/gpu/drm/xe/xe_pci_sriov.c:234:\tif (num_vfs \u0026\u0026 pci_num_vf(pdev))\ndrivers/gpu/drm/xe/xe_pci_sriov.c-235-\t\treturn -EBUSY;\n--\ndrivers/gpu/drm/xe/xe_sriov_pf.c=274=void xe_sriov_pf_print_vfs_summary(struct xe_device *xe, struct drm_printer *p)\n--\ndrivers/gpu/drm/xe/xe_sriov_pf.c-281-\tdrm_printf(p, \"supported: %u\\n\", xe-\u003esriov.pf.driver_max_vfs);\ndrivers/gpu/drm/xe/xe_sriov_pf.c:282:\tdrm_printf(p, \"enabled: %u\\n\", pci_num_vf(pdev));\ndrivers/gpu/drm/xe/xe_sriov_pf.c-283-}\n--\ndrivers/gpu/drm/xe/xe_sriov_pf_helpers.h=47=static inline unsigned int xe_sriov_pf_num_vfs(const struct xe_device *xe)\ndrivers/gpu/drm/xe/xe_sriov_pf_helpers.h-48-{\ndrivers/gpu/drm/xe/xe_sriov_pf_helpers.h:49:\treturn pci_num_vf(to_pci_dev(xe-\u003edrm.dev));\ndrivers/gpu/drm/xe/xe_sriov_pf_helpers.h-50-}\n--\ndrivers/infiniband/hw/hns/hns_roce_bond.c=484=static bool is_dev_bond_supported(struct hns_roce_bond_group *bond_grp,\n--\ndrivers/infiniband/hw/hns/hns_roce_bond.c-502-\ndrivers/infiniband/hw/hns/hns_roce_bond.c:503:\tif (hr_dev-\u003eis_vf || pci_num_vf(hr_dev-\u003epci_dev) \u003e 0) {\ndrivers/infiniband/hw/hns/hns_roce_bond.c-504-\t\tret = false;\n--\ndrivers/misc/mrvl_cn10k_dpi.c=265=static irqreturn_t dpi_mbox_intr_handler(int irq, void *data)\n--\ndrivers/misc/mrvl_cn10k_dpi.c-272-\tif (reg) {\ndrivers/misc/mrvl_cn10k_dpi.c:273:\t\tfor (vf = 0; vf \u003c pci_num_vf(dpi-\u003epdev); vf++) {\ndrivers/misc/mrvl_cn10k_dpi.c-274-\t\t\tif (reg \u0026 BIT_ULL(vf))\n--\ndrivers/misc/mrvl_cn10k_dpi.c=315=static void dpi_pfvf_mbox_work(struct work_struct *work)\n--\ndrivers/misc/mrvl_cn10k_dpi.c-331-\tvfid = DPI_MBOX_VFID(msg.word_l);\ndrivers/misc/mrvl_cn10k_dpi.c:332:\tif (vfid \u003e= pci_num_vf(dpi-\u003epdev))\ndrivers/misc/mrvl_cn10k_dpi.c-333-\t\tgoto exit;\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c=4881=int bnx2x_change_mtu(struct net_device *dev, int new_mtu)\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c-4884-\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c:4885:\tif (pci_num_vf(bp-\u003epdev)) {\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c-4886-\t\tDP(BNX2X_MSG_IOV, \"VFs are enabled, can not change MTU\\n\");\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c=4910=netdev_features_t bnx2x_fix_features(struct net_device *dev,\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c-4914-\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c:4915:\tif (pci_num_vf(bp-\u003epdev)) {\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c-4916-\t\tnetdev_features_t changed = dev-\u003efeatures ^ features;\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c=4944=int bnx2x_set_features(struct net_device *dev, netdev_features_t features)\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c-4951-\t/* VFs or non SRIOV PFs should be able to change loopback feature */\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c:4952:\tif (!pci_num_vf(bp-\u003epdev)) {\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c-4953-\t\tif (features \u0026 NETIF_F_LOOPBACK) {\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c=1942=static int bnx2x_set_ringparam(struct net_device *dev,\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c-1952-\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c:1953:\tif (pci_num_vf(bp-\u003epdev)) {\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c-1954-\t\tDP(BNX2X_MSG_IOV,\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c=3007=static void bnx2x_self_test(struct net_device *dev,\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c-3013-\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c:3014:\tif (pci_num_vf(bp-\u003epdev)) {\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c-3015-\t\tDP(BNX2X_MSG_IOV,\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c=3569=static int bnx2x_set_channels(struct net_device *dev,\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c-3578-\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c:3579:\tif (pci_num_vf(bp-\u003epdev)) {\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c-3580-\t\tDP(BNX2X_MSG_IOV, \"VFs are enabled, can not set channels\\n\");\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt.c=12615=static int bnxt_hwrm_shutdown_link(struct bnxt *bp)\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt.c-12622-\ndrivers/net/ethernet/broadcom/bnxt/bnxt.c:12623:\tif (pci_num_vf(bp-\u003epdev) \u0026\u0026\ndrivers/net/ethernet/broadcom/bnxt/bnxt.c-12624-\t    !(bp-\u003ephy_flags \u0026 BNXT_PHY_FL_FW_MANAGED_LKDN))\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c=974=void __bnxt_sriov_disable(struct bnxt *bp)\ndrivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c-975-{\ndrivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c:976:\tu16 num_vfs = pci_num_vf(bp-\u003epdev);\ndrivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c-977-\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c=1000=static void bnxt_sriov_disable(struct bnxt *bp)\ndrivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c-1001-{\ndrivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c:1002:\tif (!pci_num_vf(bp-\u003epdev))\ndrivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c-1003-\t\treturn;\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c=262=void bnxt_vf_reps_close(struct bnxt *bp)\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c-269-\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c:270:\tnum_vfs = pci_num_vf(bp-\u003epdev);\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c-271-\tfor (i = 0; i \u003c num_vfs; i++) {\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c=282=void bnxt_vf_reps_open(struct bnxt *bp)\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c-288-\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c:289:\tfor (i = 0; i \u003c pci_num_vf(bp-\u003epdev); i++) {\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c-290-\t\t/* Open the VF-Rep only if it is allocated in the FW */\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c=311=static void __bnxt_vf_reps_destroy(struct bnxt *bp)\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c-312-{\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c:313:\tu16 num_vfs = pci_num_vf(bp-\u003epdev);\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c-314-\tstruct bnxt_vf_rep *vf_rep;\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c=379=void bnxt_vf_reps_free(struct bnxt *bp)\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c-380-{\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c:381:\tu16 num_vfs = pci_num_vf(bp-\u003epdev);\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c-382-\tint i;\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c=416=int bnxt_vf_reps_alloc(struct bnxt *bp)\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c-417-{\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c:418:\tu16 *cfa_code_map = bp-\u003ecfa_code_map, num_vfs = pci_num_vf(bp-\u003epdev);\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c-419-\tstruct bnxt_vf_rep *vf_rep;\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c=489=int bnxt_vf_reps_create(struct bnxt *bp)\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c-490-{\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c:491:\tu16 *cfa_code_map = NULL, num_vfs = pci_num_vf(bp-\u003epdev);\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c-492-\tstruct bnxt_vf_rep *vf_rep;\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c=561=int bnxt_dl_eswitch_mode_set(struct devlink *devlink, u16 mode,\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c-585-\t\t/* Create representors for existing VFs */\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c:586:\t\tif (pci_num_vf(bp-\u003epdev) \u003e 0)\ndrivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c-587-\t\t\tret = bnxt_vf_reps_create(bp);\n--\ndrivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c=6235=static int cxgb4_iov_configure(struct pci_dev *pdev, int num_vfs)\n--\ndrivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c-6238-\tint err = 0;\ndrivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c:6239:\tint current_vfs = pci_num_vf(pdev);\ndrivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c-6240-\tu32 pcie_fw;\n--\ndrivers/net/ethernet/emulex/benet/be_main.c=4221=static int be_vf_setup(struct be_adapter *adapter)\n--\ndrivers/net/ethernet/emulex/benet/be_main.c-4227-\ndrivers/net/ethernet/emulex/benet/be_main.c:4228:\told_vfs = pci_num_vf(adapter-\u003epdev);\ndrivers/net/ethernet/emulex/benet/be_main.c-4229-\n--\ndrivers/net/ethernet/emulex/benet/be_main.c=4441=static int be_get_sriov_config(struct be_adapter *adapter)\n--\ndrivers/net/ethernet/emulex/benet/be_main.c-4460-\t */\ndrivers/net/ethernet/emulex/benet/be_main.c:4461:\told_vfs = pci_num_vf(adapter-\u003epdev);\ndrivers/net/ethernet/emulex/benet/be_main.c-4462-\tif (old_vfs) {\n--\ndrivers/net/ethernet/emulex/benet/be_main.c=4480=static void be_alloc_sriov_res(struct be_adapter *adapter)\ndrivers/net/ethernet/emulex/benet/be_main.c-4481-{\ndrivers/net/ethernet/emulex/benet/be_main.c:4482:\tint old_vfs = pci_num_vf(adapter-\u003epdev);\ndrivers/net/ethernet/emulex/benet/be_main.c-4483-\tstruct  be_resources vft_res = {0};\n--\ndrivers/net/ethernet/emulex/benet/be_main.c=4779=static bool be_reset_required(struct be_adapter *adapter)\n--\ndrivers/net/ethernet/emulex/benet/be_main.c-4783-\telse\ndrivers/net/ethernet/emulex/benet/be_main.c:4784:\t\treturn pci_num_vf(adapter-\u003epdev) == 0;\ndrivers/net/ethernet/emulex/benet/be_main.c-4785-}\n--\ndrivers/net/ethernet/emulex/benet/be_main.c=6022=static int be_pci_sriov_configure(struct pci_dev *pdev, int num_vfs)\n--\ndrivers/net/ethernet/emulex/benet/be_main.c-6046-\t */\ndrivers/net/ethernet/emulex/benet/be_main.c:6047:\tif (skyhawk_chip(adapter) \u0026\u0026 !pci_num_vf(pdev)) {\ndrivers/net/ethernet/emulex/benet/be_main.c-6048-\t\tbe_calculate_vf_res(adapter, adapter-\u003enum_vfs,\n--\ndrivers/net/ethernet/hisilicon/hns3/hns3_enet.c=3212=static int hns3_pci_sriov_configure(struct pci_dev *pdev, int num_vfs)\n--\ndrivers/net/ethernet/hisilicon/hns3/hns3_enet.c-3227-\t} else if (!pci_vfs_assigned(pdev)) {\ndrivers/net/ethernet/hisilicon/hns3/hns3_enet.c:3228:\t\tint num_vfs_pre = pci_num_vf(pdev);\ndrivers/net/ethernet/hisilicon/hns3/hns3_enet.c-3229-\n--\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c=2090=static int hclge_dbg_dump_fd_counter(struct seq_file *s, void *data)\n--\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c-2092-\tstruct hclge_dev *hdev = hclge_seq_file_to_hdev(s);\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c:2093:\tu8 func_num = pci_num_vf(hdev-\u003epdev) + 1; /* pf and enabled vf num */\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c-2094-\tstruct hclge_fd_ad_cnt_read_cmd *req;\n--\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c=2617=static int hclge_dbg_dump_umv_info(struct seq_file *s, void *data)\n--\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c-2619-\tstruct hclge_dev *hdev = hclge_seq_file_to_hdev(s);\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c:2620:\tu8 func_num = pci_num_vf(hdev-\u003epdev) + 1;\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c-2621-\tstruct hclge_vport *vport;\n--\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c=2780=static int hclge_dbg_dump_vlan_filter_config(struct hclge_dev *hdev,\n--\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c-2782-{\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c:2783:\tu8 func_num = pci_num_vf(hdev-\u003epdev) + 1; /* pf and enabled vf num */\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c-2784-\tu8 i, vlan_fe, bypass, ingress, egress;\n--\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c=2825=static int hclge_dbg_dump_vlan_offload_config(struct hclge_dev *hdev,\n--\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c-2827-{\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c:2828:\tu8 func_num = pci_num_vf(hdev-\u003epdev) + 1; /* pf and enabled vf num */\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c-2829-\tstruct hclge_dbg_vlan_cfg vlan_cfg;\n--\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c=2994=static void hclge_push_link_status(struct hclge_dev *hdev)\n--\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c-2999-\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c:3000:\tfor (i = 0; i \u003c pci_num_vf(hdev-\u003epdev); i++) {\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c-3001-\t\tvport = \u0026hdev-\u003evport[i + HCLGE_VF_VPORT_START_NUM];\n--\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c=3452=struct hclge_vport *hclge_get_vf_vport(struct hclge_dev *hdev, int vf)\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c-3453-{\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c:3454:\tif (!pci_num_vf(hdev-\u003epdev)) {\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c-3455-\t\tdev_err(\u0026hdev-\u003epdev-\u003edev,\n--\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c-3459-\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c:3460:\tif (vf \u003c 0 || vf \u003e= pci_num_vf(hdev-\u003epdev)) {\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c-3461-\t\tdev_err(\u0026hdev-\u003epdev-\u003edev,\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c-3462-\t\t\t\"vf id(%d) is out of range(0 \u003c= vfid \u003c %d)\\n\",\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c:3463:\t\t\tvf, pci_num_vf(hdev-\u003epdev));\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c-3464-\t\treturn NULL;\n--\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c=9923=static int hclge_resume_vf_rate(struct hclge_dev *hdev)\n--\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c-9930-\t/* resume the vf max_tx_rate after reset */\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c:9931:\tfor (vf = 0; vf \u003c pci_num_vf(hdev-\u003epdev); vf++) {\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c-9932-\t\tvport = hclge_get_vf_vport(hdev, vf);\n--\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.c=1723=int hclge_tm_get_qset_num(struct hclge_dev *hdev, u16 *qset_num)\n--\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.c-1730-\t\t/* Each PF has 8 qsets and each VF has 1 qset */\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.c:1731:\t\t*qset_num = HCLGE_TM_PF_MAX_QSET_NUM + pci_num_vf(hdev-\u003epdev);\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.c-1732-\t\treturn 0;\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_iov.c=480=void fm10k_iov_disable(struct pci_dev *pdev)\ndrivers/net/ethernet/intel/fm10k/fm10k_iov.c-481-{\ndrivers/net/ethernet/intel/fm10k/fm10k_iov.c:482:\tif (pci_num_vf(pdev) \u0026\u0026 pci_vfs_assigned(pdev))\ndrivers/net/ethernet/intel/fm10k/fm10k_iov.c-483-\t\tdev_err(\u0026pdev-\u003edev,\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_iov.c=491=int fm10k_iov_configure(struct pci_dev *pdev, int num_vfs)\ndrivers/net/ethernet/intel/fm10k/fm10k_iov.c-492-{\ndrivers/net/ethernet/intel/fm10k/fm10k_iov.c:493:\tint current_vfs = pci_num_vf(pdev);\ndrivers/net/ethernet/intel/fm10k/fm10k_iov.c-494-\tint err = 0;\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c=2463=static void fm10k_io_reset_prepare(struct pci_dev *pdev)\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-2465-\t/* warn incase we have any active VF devices */\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:2466:\tif (pci_num_vf(pdev))\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-2467-\t\tdev_warn(\u0026pdev-\u003edev,\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=15528=static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-15879-\t    !test_bit(__I40E_BAD_EEPROM, pf-\u003estate)) {\ndrivers/net/ethernet/intel/i40e/i40e_main.c:15880:\t\tif (pci_num_vf(pdev))\ndrivers/net/ethernet/intel/i40e/i40e_main.c-15881-\t\t\tset_bit(I40E_FLAG_VEB_MODE_ENA, pf-\u003eflags);\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-15963-\ndrivers/net/ethernet/intel/i40e/i40e_main.c:15964:\t\tif (pci_num_vf(pdev)) {\ndrivers/net/ethernet/intel/i40e/i40e_main.c-15965-\t\t\tdev_info(\u0026pdev-\u003edev,\ndrivers/net/ethernet/intel/i40e/i40e_main.c-15966-\t\t\t\t \"Active VFs found, allocating resources.\\n\");\ndrivers/net/ethernet/intel/i40e/i40e_main.c:15967:\t\t\terr = i40e_alloc_vfs(pf, pci_num_vf(pdev));\ndrivers/net/ethernet/intel/i40e/i40e_main.c-15968-\t\t\tif (err)\n--\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c=158=void i40e_restore_all_vfs_msi_state(struct pci_dev *pdev)\n--\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-166-\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:167:\tif (!pci_num_vf(pdev))\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-168-\t\treturn;\n--\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c=1829=int i40e_alloc_vfs(struct i40e_pf *pf, u16 num_alloc_vfs)\n--\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-1837-\t/* Check to see if we're just allocating resources for extant VFs */\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:1838:\tif (pci_num_vf(pf-\u003epdev) != num_alloc_vfs) {\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-1839-\t\tret = pci_enable_sriov(pf-\u003epdev, num_alloc_vfs);\n--\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c=1891=static int i40e_pci_sriov_enable(struct pci_dev *pdev, int num_vfs)\n--\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-1894-\tstruct i40e_pf *pf = pci_get_drvdata(pdev);\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:1895:\tint pre_existing_vfs = pci_num_vf(pdev);\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-1896-\tint err = 0;\n--\ndrivers/net/ethernet/intel/igb/igb_main.c=3754=static int igb_enable_sriov(struct pci_dev *pdev, int num_vfs, bool reinit)\n--\ndrivers/net/ethernet/intel/igb/igb_main.c-3757-\tstruct igb_adapter *adapter = netdev_priv(netdev);\ndrivers/net/ethernet/intel/igb/igb_main.c:3758:\tint old_vfs = pci_num_vf(pdev);\ndrivers/net/ethernet/intel/igb/igb_main.c-3759-\tstruct vf_mac_filter *mac_list;\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c=154=void ixgbe_enable_sriov(struct ixgbe_adapter *adapter, unsigned int max_vfs)\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-158-\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c:159:\tpre_existing_vfs = pci_num_vf(adapter-\u003epdev);\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-160-\tif (!pre_existing_vfs \u0026\u0026 !max_vfs)\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c=274=static int ixgbe_pci_sriov_enable(struct pci_dev *dev, int num_vfs)\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-277-\tstruct ixgbe_adapter *adapter = pci_get_drvdata(dev);\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c:278:\tint pre_existing_vfs = pci_num_vf(dev);\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-279-\tint err = 0, num_rx_pools, i, limit;\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c=337=static int ixgbe_pci_sriov_disable(struct pci_dev *dev)\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-342-\tu32 current_flags = adapter-\u003eflags;\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c:343:\tint prev_num_vf = pci_num_vf(dev);\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-344-#endif\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-350-\tif (!err \u0026\u0026 (current_flags != adapter-\u003eflags ||\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c:351:\t\t     prev_num_vf != pci_num_vf(dev)))\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-352-\t\tixgbe_sriov_reinit(adapter);\n--\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c=1188=static int otx2_add_flow_msg(struct otx2_nic *pfvf, struct otx2_flow *flow)\n--\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c-1274-\t\tvf = ethtool_get_flow_spec_ring_vf(ring_cookie);\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c:1275:\t\tif (vf \u003e pci_num_vf(pfvf-\u003epdev)) {\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c-1276-\t\t\tmutex_unlock(\u0026pfvf-\u003embox.lock);\n--\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c=935=int otx2_mbox_up_handler_cgx_link_event(struct otx2_nic *pf,\n--\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c-944-\t/* notify VFs about link event */\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c:945:\tfor (i = 0; i \u003c pci_num_vf(pf-\u003epdev); i++) {\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c-946-\t\tstruct otx2_vf_config *config = \u0026pf-\u003evf_configs[i];\n--\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c=1005=static void otx2_pfaf_mbox_up_handler(struct work_struct *work)\n--\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c-1033-\t/* Forward to VF iff VFs are really present */\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c:1034:\tif (devid \u0026\u0026 pci_num_vf(pf-\u003epdev)) {\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c-1035-\t\totx2_forward_vf_mbox_msgs(pf, \u0026pf-\u003embox.mbox_up,\n--\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c=1827=static bool otx2_promisc_use_mce_list(struct otx2_nic *pfvf)\n--\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c-1835-\t/* check if there are any trusted VFs associated with the PF netdev */\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c:1836:\tfor (vf = 0; vf \u003c pci_num_vf(pfvf-\u003epdev); vf++)\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c-1837-\t\tif (pfvf-\u003evf_configs[vf].trusted)\n--\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c=2742=static int otx2_set_vf_vlan(struct net_device *netdev, int vf, u16 vlan, u8 qos,\n--\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c-2750-\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c:2751:\tif (vf \u003e= pci_num_vf(pdev))\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c-2752-\t\treturn -EINVAL;\n--\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c=2767=static int otx2_get_vf_config(struct net_device *netdev, int vf,\n--\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c-2776-\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c:2777:\tif (vf \u003e= pci_num_vf(pdev))\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c-2778-\t\treturn -EINVAL;\n--\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c=2924=static int otx2_ndo_set_vf_trust(struct net_device *netdev, int vf,\n--\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c-2930-\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c:2931:\tif (vf \u003e= pci_num_vf(pdev))\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c-2932-\t\treturn -EINVAL;\n--\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c=3459=static int otx2_sriov_disable(struct pci_dev *pdev)\n--\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c-3462-\tstruct otx2_nic *pf = netdev_priv(netdev);\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c:3463:\tint numvfs = pci_num_vf(pdev);\ndrivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c-3464-\n--\ndrivers/net/ethernet/mellanox/mlx4/main.c=3380=static int mlx4_load_one(struct pci_dev *pdev, int pci_dev_data,\n--\ndrivers/net/ethernet/mellanox/mlx4/main.c-3449-\t\t\tdev-\u003eflags = MLX4_FLAG_MASTER;\ndrivers/net/ethernet/mellanox/mlx4/main.c:3450:\t\t\texisting_vfs = pci_num_vf(pdev);\ndrivers/net/ethernet/mellanox/mlx4/main.c-3451-\t\t\tif (existing_vfs)\n--\ndrivers/net/ethernet/mellanox/mlx5/core/devlink.c=189=static int mlx5_devlink_reload_down(struct devlink *devlink, bool netns_change,\n--\ndrivers/net/ethernet/mellanox/mlx5/core/devlink.c-220-\ndrivers/net/ethernet/mellanox/mlx5/core/devlink.c:221:\tif (mlx5_core_is_pf(dev) \u0026\u0026 pci_num_vf(pdev))\ndrivers/net/ethernet/mellanox/mlx5/core/devlink.c-222-\t\tNL_SET_ERR_MSG_MOD(extack, \"reload while VFs are present is unfavorable\");\n--\ndrivers/net/ethernet/mellanox/mlx5/core/eswitch.c=1153=mlx5_esw_host_pf_from_net_func_params(const u8 *entry, int num_entries)\n--\ndrivers/net/ethernet/mellanox/mlx5/core/eswitch.c-1170-\t\t\t.num_of_vfs = MLX5_GET(network_function_params,\ndrivers/net/ethernet/mellanox/mlx5/core/eswitch.c:1171:\t\t\t\t\t       entry, pci_num_vfs),\ndrivers/net/ethernet/mellanox/mlx5/core/eswitch.c-1172-\t\t\t.total_vfs = MLX5_GET(network_function_params,\n--\ndrivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h=407=static inline bool mlx5_sriov_is_enabled(struct mlx5_core_dev *dev)\ndrivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h-408-{\ndrivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h:409:\treturn pci_num_vf(dev-\u003epdev) ? true : false;\ndrivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h-410-}\n--\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c=203=void mlx5_sriov_disable(struct pci_dev *pdev, bool num_vf_change)\n--\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c-206-\tstruct devlink *devlink = priv_to_devlink(dev);\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c:207:\tint num_vfs = pci_num_vf(dev-\u003epdev);\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c-208-\n--\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c=233=int mlx5_core_sriov_set_msix_vec_count(struct pci_dev *vf, int msix_vec_count)\n--\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c-246-\t\tmsix_vec_count =\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c:247:\t\t\tmlx5_get_default_msix_vec_count(dev, pci_num_vf(pf));\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c-248-\n--\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c=257=int mlx5_sriov_attach(struct mlx5_core_dev *dev)\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c-258-{\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c:259:\tif (!mlx5_core_is_pf(dev) || !pci_num_vf(dev-\u003epdev))\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c-260-\t\treturn 0;\n--\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c-262-\t/* If sriov VFs exist in PCI level, enable them in device level */\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c:263:\treturn mlx5_device_enable_sriov(dev, pci_num_vf(dev-\u003epdev));\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c-264-}\n--\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c=266=void mlx5_sriov_detach(struct mlx5_core_dev *dev)\n--\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c-270-\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c:271:\tmlx5_device_disable_sriov(dev, pci_num_vf(dev-\u003epdev), false, false);\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c-272-}\n--\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c=298=int mlx5_sriov_init(struct mlx5_core_dev *dev)\n--\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c-308-\tsriov-\u003emax_vfs = mlx5_get_max_vfs(dev);\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c:309:\tsriov-\u003enum_vfs = pci_num_vf(pdev);\ndrivers/net/ethernet/mellanox/mlx5/core/sriov.c-310-\tsriov-\u003emax_ec_vfs = mlx5_core_ec_sriov_enabled(dev) ? pci_sriov_get_totalvfs(dev-\u003epdev) : 0;\n--\ndrivers/net/ethernet/netronome/nfp/nfp_main.c=757=static int nfp_pci_probe(struct pci_dev *pdev,\n--\ndrivers/net/ethernet/netronome/nfp/nfp_main.c-847-\ndrivers/net/ethernet/netronome/nfp/nfp_main.c:848:\tpf-\u003enum_vfs = pci_num_vf(pdev);\ndrivers/net/ethernet/netronome/nfp/nfp_main.c-849-\tif (pf-\u003enum_vfs \u003e pf-\u003elimit_vfs) {\n--\ndrivers/net/ethernet/pensando/ionic/ionic_bus_pci.c=308=static int ionic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)\n--\ndrivers/net/ethernet/pensando/ionic/ionic_bus_pci.c-360-\tinit_rwsem(\u0026ionic-\u003evf_op_lock);\ndrivers/net/ethernet/pensando/ionic/ionic_bus_pci.c:361:\tnum_vfs = pci_num_vf(pdev);\ndrivers/net/ethernet/pensando/ionic/ionic_bus_pci.c-362-\tif (num_vfs) {\n--\ndrivers/net/ethernet/pensando/ionic/ionic_lif.c=2348=static int ionic_get_vf_config(struct net_device *netdev,\n--\ndrivers/net/ethernet/pensando/ionic/ionic_lif.c-2359-\ndrivers/net/ethernet/pensando/ionic/ionic_lif.c:2360:\tif (vf \u003e= pci_num_vf(ionic-\u003epdev) || !ionic-\u003evfs) {\ndrivers/net/ethernet/pensando/ionic/ionic_lif.c-2361-\t\tret = -EINVAL;\n--\ndrivers/net/ethernet/pensando/ionic/ionic_lif.c=2379=static int ionic_get_vf_stats(struct net_device *netdev, int vf,\n--\ndrivers/net/ethernet/pensando/ionic/ionic_lif.c-2391-\ndrivers/net/ethernet/pensando/ionic/ionic_lif.c:2392:\tif (vf \u003e= pci_num_vf(ionic-\u003epdev) || !ionic-\u003evfs) {\ndrivers/net/ethernet/pensando/ionic/ionic_lif.c-2393-\t\tret = -EINVAL;\n--\ndrivers/net/ethernet/pensando/ionic/ionic_lif.c=2416=static int ionic_set_vf_mac(struct net_device *netdev, int vf, u8 *mac)\n--\ndrivers/net/ethernet/pensando/ionic/ionic_lif.c-2430-\ndrivers/net/ethernet/pensando/ionic/ionic_lif.c:2431:\tif (vf \u003e= pci_num_vf(ionic-\u003epdev) || !ionic-\u003evfs) {\n\n"
}

gemini-3.1-pro-preview

null

null

							input: 26375
							output: 34
							thoughts: 45
						

**Investigating the Definition of `pci_num_vf`**

Okay, so I'm trying to track down the definition of `pci_num_vf`. My initial thought is to check the standard include files, and since this sounds like a PCI-specific value, `include/linux/pci.h` is the logical place to start. Let's get to that file and see what it reveals about `pci_num_vf`. I'm expecting to find a macro, a structure member, or something that clarifies its meaning and usage in the kernel's PCI subsystem. Let's dive in.

{
  "Expression": "pci_num_vf",
  "PathPrefix": "include/linux/pci.h"
}

{
  "Output": "include/linux/pci.h=2569=void pci_iov_remove_virtfn(struct pci_dev *dev, int id);\ninclude/linux/pci.h:2570:int pci_num_vf(struct pci_dev *dev);\ninclude/linux/pci.h-2571-int pci_vfs_assigned(struct pci_dev *dev);\n--\ninclude/linux/pci.h=2620=static inline void pci_disable_sriov(struct pci_dev *dev) { }\ninclude/linux/pci.h:2621:static inline int pci_num_vf(struct pci_dev *dev) { return 0; }\ninclude/linux/pci.h-2622-static inline int pci_vfs_assigned(struct pci_dev *dev)\n"
}

gemini-3.1-pro-preview

null

null

							input: 26811
							output: 33
							thoughts: 245
						

**My Configuration Checklist**

Okay, so I'm diving into this `pci_num_vf` situation. I need to make sure I have the right kernel configuration to properly test this new code. It looks like `pci_num_vf` is present regardless, but it'll return zero if `PCI_IOV` isn't enabled. That's no good for me; I need to actually *run* the code, not just check if it's there. So, `PCI_IOV` *definitely* needs to be in my `EnableConfigs`.

Then there's `VFIO_PCI`. I know that I need the VFIO PCI driver for exposing PCI devices to VFIO, so I need to make sure that is included. Then I recalled that `VFIO_PCI` has a dependency on `VFIO_PCI_CORE`. Good thing I checked! But, does `VFIO_PCI` *alone* get me what I need?

Looks like that’s sufficient. `VFIO_PCI` selects `VFIO_PCI_CORE`, so that dependency is already handled. Are there any other required configs? I know I'll need `PCI`, but that's a base config and likely already enabled. I also need `PCI_IOV`, which is already on the list. But I *also* need `VFIO_PCI` for the virtual function driver.

Finally, I need to check `VFIO`. Seems like `VFIO_PCI` depends on `VFIO`. Let's confirm this by checking `drivers/vfio/Kconfig`.

{
  "File": "drivers/vfio/Kconfig",
  "FirstLine": 1,
  "LineCount": 20
}

{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0-only\n   2:\tmenuconfig VFIO\n   3:\t\ttristate \"VFIO Non-Privileged userspace driver framework\"\n   4:\t\tselect IOMMU_API\n   5:\t\tdepends on IOMMUFD || !IOMMUFD\n   6:\t\tselect INTERVAL_TREE\n   7:\t\tselect VFIO_GROUP if SPAPR_TCE_IOMMU || IOMMUFD=n\n   8:\t\tselect VFIO_DEVICE_CDEV if !VFIO_GROUP\n   9:\t\tselect VFIO_CONTAINER if IOMMUFD=n\n  10:\t\thelp\n  11:\t\t  VFIO provides a framework for secure userspace device drivers.\n  12:\t\t  See Documentation/driver-api/vfio.rst for more details.\n  13:\t\n  14:\t\t  If you don't know what to do here, say N.\n  15:\t\n  16:\tif VFIO\n  17:\tconfig VFIO_DEVICE_CDEV\n  18:\t\tbool \"Support for the VFIO cdev /dev/vfio/devices/vfioX\"\n  19:\t\tdepends on IOMMUFD \u0026\u0026 !SPAPR_TCE_IOMMU\n  20:\t\tdefault !VFIO_GROUP\n"
}

gemini-3.1-pro-preview

null

null

							input: 27759
							output: 34
							thoughts: 209
						

**VFIO Configuration Deep Dive**

Okay, so I'm looking at setting up `VFIO`, and it seems like the key configs to enable are `VFIO`, `VFIO_PCI`, and `PCI_IOV`. I need to ensure everything is in place for my setup. I wondered about `VFIO_PCI_CORE`, but after checking the Kconfig in `drivers/vfio/pci/Kconfig`, it's not directly visible. It's actually selected by `VFIO_PCI`, so I'll be enabling that instead.

Now, my mind shifts to function calls. I'm focusing on `vfio_pci_core_close_device` and `vfio_pci_core_sriov_configure` specifically. Hmm, `vfio_pci_core_sriov_configure` is being called with `nr_virtfn = 0`. This is interesting; I need to dig deeper here. Time to examine the implementation of `vfio_pci_core_sriov_configure` to see if it might be a fruitful area for fuzzing or further investigation. It seems like it could present an interesting attack surface.

{
  "Expression": "int vfio_pci_core_sriov_configure",
  "PathPrefix": ""
}

{
  "Output": "drivers/vfio/pci/vfio_pci_core.c=2356=EXPORT_SYMBOL_GPL(vfio_pci_core_aer_err_detected);\ndrivers/vfio/pci/vfio_pci_core.c-2357-\ndrivers/vfio/pci/vfio_pci_core.c:2358:int vfio_pci_core_sriov_configure(struct vfio_pci_core_device *vdev,\ndrivers/vfio/pci/vfio_pci_core.c-2359-\t\t\t\t  int nr_virtfn)\n--\ninclude/linux/vfio_pci_core.h=171=extern const struct pci_error_handlers vfio_pci_core_err_handlers;\ninclude/linux/vfio_pci_core.h:172:int vfio_pci_core_sriov_configure(struct vfio_pci_core_device *vdev,\ninclude/linux/vfio_pci_core.h-173-\t\t\t\t  int nr_virtfn);\n"
}

gemini-3.1-pro-preview

null

null

							input: 28540
							output: 46
							thoughts: 19
						

Okay, here's my attempt at summarizing the thought process, as if I were an expert:

**Delving into `vfio_pci_core_sriov_configure`**

Alright, let's dive into the guts of `vfio_pci_core_sriov_configure`. This is where the rubber meets the road for SR-IOV configuration, so it's critical to understand the control flow here. First, I need to see how it's called; what sets the stage for this function? Are we coming in through device probe, some user-space request, or some other part of the vfio/PCI initialization lifecycle? It's essential to grasp the context.

My immediate focus will be on the key decision points and conditional branches. I'll need to figure out how it handles the different aspects of configuring SR-IOV. Does it involve setting up the number of Virtual Functions (VFs)? Are there checks for hardware capabilities, resource allocation, and permissioning? I'll be looking for where it interacts with the PCI configuration space, especially the VF BARs (Base Address Registers), and how it interacts with the VF drivers.

A deeper understanding will involve how it handles any errors. I need to know the error codes it returns and their implications. Are there retries or fallback mechanisms? Does it clean up partially configured state if something goes wrong? Proper error handling is essential for reliable operation.

Finally, I'll need to think about potential race conditions and locking strategies. Given that we're dealing with concurrent access from the host and potentially the guest, the locking around configuration changes is crucial. I'll be looking for mutexes, spinlocks, or other synchronization primitives used to protect shared data structures and prevent conflicts. Are they fine-grained enough, or could they lead to contention?

The goal is to get a solid grasp of how this function configures SR-IOV, how it interacts with the underlying hardware and VF drivers, and what it does to ensure a stable and secure setup. Ultimately, this understanding should allow me to identify areas for potential optimization, bug fixes, or new features.

{
  "File": "drivers/vfio/pci/vfio_pci_core.c",
  "FirstLine": 2358,
  "LineCount": 50
}

{
  "Contents": "2358:\tint vfio_pci_core_sriov_configure(struct vfio_pci_core_device *vdev,\n2359:\t\t\t\t\t  int nr_virtfn)\n2360:\t{\n2361:\t\tstruct pci_dev *pdev = vdev-\u003epdev;\n2362:\t\tint ret = 0;\n2363:\t\n2364:\t\tdevice_lock_assert(\u0026pdev-\u003edev);\n2365:\t\n2366:\t\tif (nr_virtfn) {\n2367:\t\t\tmutex_lock(\u0026vfio_pci_sriov_pfs_mutex);\n2368:\t\t\t/*\n2369:\t\t\t * The thread that adds the vdev to the list is the only thread\n2370:\t\t\t * that gets to call pci_enable_sriov() and we will only allow\n2371:\t\t\t * it to be called once without going through\n2372:\t\t\t * pci_disable_sriov()\n2373:\t\t\t */\n2374:\t\t\tif (!list_empty(\u0026vdev-\u003esriov_pfs_item)) {\n2375:\t\t\t\tret = -EINVAL;\n2376:\t\t\t\tgoto out_unlock;\n2377:\t\t\t}\n2378:\t\t\tlist_add_tail(\u0026vdev-\u003esriov_pfs_item, \u0026vfio_pci_sriov_pfs);\n2379:\t\t\tmutex_unlock(\u0026vfio_pci_sriov_pfs_mutex);\n2380:\t\n2381:\t\t\t/*\n2382:\t\t\t * The PF power state should always be higher than the VF power\n2383:\t\t\t * state. The PF can be in low power state either with runtime\n2384:\t\t\t * power management (when there is no user) or PCI_PM_CTRL\n2385:\t\t\t * register write by the user. If PF is in the low power state,\n2386:\t\t\t * then change the power state to D0 first before enabling\n2387:\t\t\t * SR-IOV. Also, this function can be called at any time, and\n2388:\t\t\t * userspace PCI_PM_CTRL write can race against this code path,\n2389:\t\t\t * so protect the same with 'memory_lock'.\n2390:\t\t\t */\n2391:\t\t\tret = pm_runtime_resume_and_get(\u0026pdev-\u003edev);\n2392:\t\t\tif (ret)\n2393:\t\t\t\tgoto out_del;\n2394:\t\n2395:\t\t\tdown_write(\u0026vdev-\u003ememory_lock);\n2396:\t\t\tvfio_pci_set_power_state(vdev, PCI_D0);\n2397:\t\t\tvdev-\u003esriov_active = true;\n2398:\t\t\tup_write(\u0026vdev-\u003ememory_lock);\n2399:\t\t\tret = pci_enable_sriov(pdev, nr_virtfn);\n2400:\t\t\tif (ret) {\n2401:\t\t\t\tpm_runtime_put(\u0026pdev-\u003edev);\n2402:\t\t\t\tgoto out_del;\n2403:\t\t\t}\n2404:\t\t\treturn nr_virtfn;\n2405:\t\t}\n2406:\t\n2407:\t\tif (pci_num_vf(pdev)) {\n"
}

gemini-3.1-pro-preview

null

null

							input: 29907
							output: 46
							thoughts: 10
						

Okay, here's my attempt at summarizing the thought process, adopting the first-person perspective as requested, assuming the user is an expert.

**Analyzing Function Implementation**

Alright, I've got the general context locked in. Now, I need to zoom in and examine the implementation in detail. It's time to dive into the core logic and grasp how this function achieves its purpose. The big picture is set, so let's parse through the lines and trace the execution path. Let's see how the individual components fit together to produce the desired output, or in this case, continue our work.

{
  "File": "drivers/vfio/pci/vfio_pci_core.c",
  "FirstLine": 2407,
  "LineCount": 30
}

{
  "Contents": "2407:\t\tif (pci_num_vf(pdev)) {\n2408:\t\t\tpci_disable_sriov(pdev);\n2409:\t\t\tpm_runtime_put(\u0026pdev-\u003edev);\n2410:\t\t}\n2411:\t\n2412:\tout_del:\n2413:\t\t/*\n2414:\t\t * Avoid taking the memory_lock intentionally. A race with a power\n2415:\t\t * state transition would at most result in an -EBUSY, leaving the\n2416:\t\t * device in PCI_D0.\n2417:\t\t */\n2418:\t\tvdev-\u003esriov_active = false;\n2419:\t\n2420:\t\tmutex_lock(\u0026vfio_pci_sriov_pfs_mutex);\n2421:\t\tlist_del_init(\u0026vdev-\u003esriov_pfs_item);\n2422:\tout_unlock:\n2423:\t\tmutex_unlock(\u0026vfio_pci_sriov_pfs_mutex);\n2424:\t\treturn ret;\n2425:\t}\n2426:\tEXPORT_SYMBOL_GPL(vfio_pci_core_sriov_configure);\n2427:\t\n2428:\tconst struct pci_error_handlers vfio_pci_core_err_handlers = {\n2429:\t\t.error_detected = vfio_pci_core_aer_err_detected,\n2430:\t};\n2431:\tEXPORT_SYMBOL_GPL(vfio_pci_core_err_handlers);\n2432:\t\n2433:\tstatic bool vfio_dev_in_groups(struct vfio_device *vdev,\n2434:\t\t\t\t       struct vfio_pci_group_info *groups)\n2435:\t{\n2436:\t\tunsigned int i;\n"
}

gemini-3.1-pro-preview

null

null

							input: 30589
							output: 130
							thoughts: 456
						

**My Analysis of the VFIO PCI Device Closure Patch**

Okay, let's break this down. My initial thought is that `vfio_pci_core_sriov_configure` with `nr_virtfn = 0` effectively disables SRIOV, removing the device from the `vfio_pci_sriov_pfs` list. This seems correct and is definitely reachable if VFs are already enabled. The key part is, of course, the condition: `if (pci_num_vf(vdev->pdev))`. This checks if any VFs are present.  If so, the patch calls `vfio_pci_core_sriov_configure(vdev, 0)` within `vfio_pci_core_close_device`, ensuring VFs are disabled *before* the device is closed.  This is a critical functional change to prevent potential issues when devices are removed.

So, to summarize succinctly: This patch introduces a functional change in `vfio_pci_core_close_device` to explicitly disable SR-IOV VFs. This ensures VFs are disabled on device closure, which is essential to virtualized environments using vfio-pci. I'd assess `vfio_pci_core_close_device` and `vfio_pci_core_sriov_configure` as the symbols of focus. This is a good candidate for fuzzing.

Now, let's think about the configuration requirements. Initially, I suspected we might need more than just `VFIO`, and that `VFIO_VIRQFD` would be necessary.  However, `VFIO_PCI_CORE` selects `VFIO_VIRQFD` and `IRQ_BYPASS_MANAGER`, which indicates that `VFIO_PCI` is sufficient. But, we also need `PCI_IOV` since `pci_num_vf` is the trigger. It is a necessary prerequisite to obtain a non-zero value. Thus, `VFIO_PCI` and `PCI_IOV` are required, along with `VFIO` of course. I can't see any other necessary dependencies, so let's lock this down and generate the results.

{
  "EnableConfigs": [
    "VFIO",
    "VFIO_PCI",
    "PCI_IOV"
  ],
  "FocusSymbols": [
    "vfio_pci_core_close_device",
    "vfio_pci_core_sriov_configure"
  ],
  "Reasoning": "The patch adds a functional change to disable SR-IOV VFs when a VFIO PCI device is closed. This is reachable in virtualized environments by binding a virtual PCI device to vfio-pci, enabling VFs, and closing the device.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "VFIO",
    "VFIO_PCI",
    "PCI_IOV"
  ],
  "FocusSymbols": [
    "vfio_pci_core_close_device",
    "vfio_pci_core_sriov_configure"
  ],
  "Reasoning": "The patch adds a functional change to disable SR-IOV VFs when a VFIO PCI device is closed. This is reachable in virtualized environments by binding a virtual PCI device to vfio-pci, enabling VFs, and closing the device.",
  "WorthFuzzing": true
}