| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/08/07 23:16 | flow | patch-triage |
1mArgs:null Results: {
"EnableConfigs": null,
"FocusSymbols": [],
"KMSANReasoning": "",
"NeedsKMSAN": false,
"Reasoning": "The patch modifies a hot-unplug callback (`vfio_ap_mdev_cfg_remove`) in the s390 VFIO AP crypto driver, which is executed only when AP adapters or domains are removed from the host AP configuration. According to the instructions, teardown callbacks executed only during hot-unplug operations are not worth fuzzing.",
"WorthFuzzing": false
} |
| 1/1 | 2026/08/07 23:16 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit 7e36193224e6ba5e1e3fe350c3547f6361c7e108\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Fri Aug 7 23:16:57 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c\nindex 44b3a1dcc1b36..1bfdbe85023dd 100644\n--- a/drivers/s390/crypto/vfio_ap_ops.c\n+++ b/drivers/s390/crypto/vfio_ap_ops.c\n@@ -2615,9 +2615,9 @@ static void vfio_ap_mdev_cfg_remove(unsigned long *ap_remove,\n \t\tdo_remove |= bitmap_and(aqrem, aq_remove,\n \t\t\t\t\t matrix_mdev-\u003ematrix.aqm,\n \t\t\t\t\t AP_DOMAINS);\n-\t\tdo_remove |= bitmap_andnot(cdrem, cd_remove,\n-\t\t\t\t\t matrix_mdev-\u003ematrix.adm,\n-\t\t\t\t\t AP_DOMAINS);\n+\t\tdo_remove |= bitmap_and(cdrem, cd_remove,\n+\t\t\t\t\tmatrix_mdev-\u003ematrix.adm,\n+\t\t\t\t\tAP_DOMAINS);\n \n \t\tif (do_remove)\n \t\t\tvfio_ap_mdev_hot_unplug_cfg(matrix_mdev, aprem, aqrem,\n"
} |
| 2/1 | 2026/08/07 23:16 | agent | patch-evaluator |
1mModel:best-expensive Args: null Results: {
"EnableConfigs": null,
"FocusSymbols": [],
"Reasoning": "The patch modifies a hot-unplug callback (`vfio_ap_mdev_cfg_remove`) in the s390 VFIO AP crypto driver, which is executed only when AP adapters or domains are removed from the host AP configuration. According to the instructions, teardown callbacks executed only during hot-unplug operations are not worth fuzzing.",
"WorthFuzzing": false
}Instruction: 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. Prompt: For your convenience, here is the diff of the changes:
commit 7e36193224e6ba5e1e3fe350c3547f6361c7e108
Author: syz-cluster <triage@syzkaller.com>
Date: Fri Aug 7 23:16:57 2026 +0000
syz-cluster: applied patch under review
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 44b3a1dcc1b36..1bfdbe85023dd 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -2615,9 +2615,9 @@ static void vfio_ap_mdev_cfg_remove(unsigned long *ap_remove,
do_remove |= bitmap_and(aqrem, aq_remove,
matrix_mdev->matrix.aqm,
AP_DOMAINS);
- do_remove |= bitmap_andnot(cdrem, cd_remove,
- matrix_mdev->matrix.adm,
- AP_DOMAINS);
+ do_remove |= bitmap_and(cdrem, cd_remove,
+ matrix_mdev->matrix.adm,
+ AP_DOMAINS);
if (do_remove)
vfio_ap_mdev_hot_unplug_cfg(matrix_mdev, aprem, aqrem,
|
| 3/2 | 2026/08/07 23:16 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 2099 output: 48 thoughts: 269 Thoughts: **Analyzing a Crypto Driver Change** Okay, so this patch is in `drivers/s390/crypto/vfio_ap_ops.c`. Right away, that tells me it's s390-specific, so we're talking mainframe territory. It's a `bitmap_andnot` to `bitmap_and` change within the `vfio_ap_mdev_cfg_remove` function. The key question is whether this code path is even *reachable* in a virtualized environment like QEMU. We can emulate s390x in QEMU, but does it necessitate specific hardware configurations to hit this section of code? VFIO AP is specifically for Adjunct Processor crypto cards on s390, which is important to remember. Now, can this be fuzzed? The prompt states that unreachable code paths in virtualization, even with software-emulated hardware, shouldn't be considered. The prompt mentions `.remove`, `.shutdown`, and teardown callbacks as areas to be wary of, especially those executed during PCI hot-unplug or sysfs driver unbind operations. I need to focus on `vfio_ap_mdev_cfg_remove` to assess the potential impact of the patch. |
| 4/2 | 2026/08/07 23:17 | tool | grepper |
0mArgs:{
"Expression": "vfio_ap_mdev_cfg_remove",
"PathPrefix": "drivers/s390/crypto/vfio_ap_ops.c"
}Results: {
"Output": "drivers/s390/crypto/vfio_ap_ops.c=2557=static void vfio_ap_mdev_hot_unplug_cfg(struct ap_matrix_mdev *matrix_mdev,\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2585-/**\ndrivers/s390/crypto/vfio_ap_ops.c:2586: * vfio_ap_mdev_cfg_remove - determines which guests are using the adapters,\ndrivers/s390/crypto/vfio_ap_ops.c-2587- *\t\t\t domains and control domains that have been removed\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2597- */\ndrivers/s390/crypto/vfio_ap_ops.c:2598:static void vfio_ap_mdev_cfg_remove(unsigned long *ap_remove,\ndrivers/s390/crypto/vfio_ap_ops.c-2599-\t\t\t\t unsigned long *aq_remove,\n--\ndrivers/s390/crypto/vfio_ap_ops.c=2639=static void vfio_ap_mdev_on_cfg_remove(struct ap_config_info *cur_config_info,\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2660-\tif (do_remove)\ndrivers/s390/crypto/vfio_ap_ops.c:2661:\t\tvfio_ap_mdev_cfg_remove(aprem, aqrem, cdrem);\ndrivers/s390/crypto/vfio_ap_ops.c-2662-}\n"
} |
| 5/2 | 2026/08/07 23:17 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 3116 output: 50 thoughts: 19 Thoughts: Okay, here's my summary, taking on the persona you've requested, aimed at an expert audience: **Analyzing `vfio_ap_mdev_on_cfg_remove`** Alright, let's dive into `vfio_ap_mdev_on_cfg_remove`. My immediate thought is, "What's the context here?" This name screams something related to the advanced programming (AP) mode within VFIO, and specifically, the handling of mediated devices (mdevs). The "on_cfg_remove" part strongly suggests that this function is triggered when a configuration for an mdev is being removed, likely during device unbinding, driver detachment, or a similar teardown sequence. I’m already mentally mapping this to potential areas of interest: * **Resource Cleanup:** Is this function responsible for freeing allocated resources associated with the mdev's configuration? I suspect so. I need to be thinking about memory allocations, interrupt vectors, DMA mappings, and anything else the configuration might have set up. * **Synchronization:** Given the complexity of VFIO and the multi-threaded nature of the kernel, I'm going to have to make sure that any shared data structures are protected. Is there a spinlock, mutex, or other mechanism here? Are there any potential race conditions I need to identify? * **Error Handling:** What's the error-handling strategy? Does the function return error codes, or does it panic? What specific errors can occur during the removal process? I need to know how resilient this function is. * **Call Sites:** Where is this function called from? Knowing the callers will help me understand the overall sequence of events and the context in which `vfio_ap_mdev_on_cfg_remove` operates. `grep` and a good understanding of VFIO's device model should help me sort that out quickly. * **Side Effects:** Are there any side effects? Any changes to other VFIO or device state? I'll need to scrutinize any code that interacts with other data structures or calls out to other VFIO-related functions. My approach will be methodical. I will quickly scan the function body for key indicators: locking, resource deallocation, error checking, and interactions with VFIO core data structures. After that, I'll trace its callers to build a comprehensive picture of its role within the larger system. The devil is always in the details, so I need to pay close attention. I also need to make sure this function doesn't leak resources or leave any lingering state. Let's see what we've got. |
| 6/2 | 2026/08/07 23:17 | tool | grepper |
0mArgs:{
"Expression": "vfio_ap_mdev_on_cfg_remove",
"PathPrefix": "drivers/s390/crypto/vfio_ap_ops.c"
}Results: {
"Output": "drivers/s390/crypto/vfio_ap_ops.c=2598=static void vfio_ap_mdev_cfg_remove(unsigned long *ap_remove,\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2631-/**\ndrivers/s390/crypto/vfio_ap_ops.c:2632: * vfio_ap_mdev_on_cfg_remove - responds to the removal of adapters, domains and\ndrivers/s390/crypto/vfio_ap_ops.c-2633- *\t\t\t\tcontrol domains from the host AP configuration\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2638- */\ndrivers/s390/crypto/vfio_ap_ops.c:2639:static void vfio_ap_mdev_on_cfg_remove(struct ap_config_info *cur_config_info,\ndrivers/s390/crypto/vfio_ap_ops.c-2640-\t\t\t\t struct ap_config_info *prev_config_info)\n--\ndrivers/s390/crypto/vfio_ap_ops.c=2804=void vfio_ap_on_cfg_changed(struct ap_config_info *cur_cfg_info,\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2811-\ndrivers/s390/crypto/vfio_ap_ops.c:2812:\tvfio_ap_mdev_on_cfg_remove(cur_cfg_info, prev_cfg_info);\ndrivers/s390/crypto/vfio_ap_ops.c-2813-\tvfio_ap_mdev_on_cfg_add(cur_cfg_info, prev_cfg_info);\n"
} |
| 7/2 | 2026/08/07 23:17 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 4200 output: 39 thoughts: 16 Thoughts: Okay, here's my attempt at summarizing the thought process, as if it were my own, assuming I'm an expert in this field: **Tracing `vfio_ap_on_cfg_changed`** Alright, let's dive into this. The function name, `vfio_ap_on_cfg_changed`, immediately suggests this is a callback or handler within the VFIO (Virtual Function I/O) framework, specifically dealing with changes to the configuration of an I/O device. My initial thought is to understand *what* configuration is changing, and *why* this handler is the one being triggered. Is it a hotplug event? A device re-enumeration? A user-space command? Or, is it due to the internal operation of the VFIO system itself? My first step would be to figure out where this function is called from, by cross-referencing it with the call stack. A quick search should reveal the likely callers, allowing me to build a contextual understanding of how the configuration change is being initiated. I'll need to look for code that sets up or manages VFIO devices, probably involving things like PCI device structures, DMA mappings, and perhaps even device-specific registers. Next, I need to understand the arguments passed to this function. What kind of data is passed in? Is it the PCI configuration space itself, or a pointer to some VFIO-internal representation of the change? Are there device identifiers? Contextual information? Understanding the input parameters will be vital to deciphering the function’s logic. From there, I'll examine the function's internal workings. What's it doing? Is it manipulating device-specific registers? Is it updating VFIO data structures? Is it notifying user-space via an eventfd or ioctl? Does it involve acquiring any locks or critical sections to maintain data consistency? I'd expect it to be handling aspects related to device initialization, resource allocation, and permission management. Any interaction with the MMIO region or DMA settings will be of particular interest. I'll pay close attention to potential race conditions or memory corruption. Finally, I'll need to consider the larger picture. How does this fit into the overall VFIO device lifecycle? What are the potential consequences if this handler fails or has an unexpected side effect? Are there other related handlers? Are there potential security implications of allowing configuration changes on the IOMMU side? Are we working in a secure environment? And, I'll need to figure out what happens if something goes wrong; are there error paths or logging in place? This will inform my assessment of the function's correctness, robustness, and performance. |
| 8/2 | 2026/08/07 23:17 | tool | grepper |
0mArgs:{
"Expression": "vfio_ap_on_cfg_changed",
"PathPrefix": "drivers/s390/crypto/"
}Results: {
"Output": "drivers/s390/crypto/vfio_ap_drv.c=58=static struct ap_driver vfio_ap_drv = {\n--\ndrivers/s390/crypto/vfio_ap_drv.c-61-\t.in_use = vfio_ap_mdev_resource_in_use,\ndrivers/s390/crypto/vfio_ap_drv.c:62:\t.on_config_changed = vfio_ap_on_cfg_changed,\ndrivers/s390/crypto/vfio_ap_drv.c-63-\t.on_scan_complete = vfio_ap_on_scan_complete,\n--\ndrivers/s390/crypto/vfio_ap_ops.c=2772=static void vfio_ap_mdev_on_cfg_add(struct ap_config_info *cur_config_info,\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2797-/**\ndrivers/s390/crypto/vfio_ap_ops.c:2798: * vfio_ap_on_cfg_changed - handles notification of changes to the host AP\ndrivers/s390/crypto/vfio_ap_ops.c-2799- *\t\t\t configuration.\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2803- */\ndrivers/s390/crypto/vfio_ap_ops.c:2804:void vfio_ap_on_cfg_changed(struct ap_config_info *cur_cfg_info,\ndrivers/s390/crypto/vfio_ap_ops.c-2805-\t\t\t struct ap_config_info *prev_cfg_info)\n--\ndrivers/s390/crypto/vfio_ap_private.h=161=int vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm);\ndrivers/s390/crypto/vfio_ap_private.h-162-\ndrivers/s390/crypto/vfio_ap_private.h:163:void vfio_ap_on_cfg_changed(struct ap_config_info *new_config_info,\ndrivers/s390/crypto/vfio_ap_private.h-164-\t\t\t struct ap_config_info *old_config_info);\n"
} |
| 9/2 | 2026/08/07 23:17 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 5412 output: 34 thoughts: 157 Thoughts: **AP Configuration Changes in a Virtualized World** Okay, so I'm looking at this `on_config_changed` callback, specifically related to AP configurations. My immediate thought is, "Can this even *happen* in a virtualized environment?" It's s390 specific, which already narrows the scope, and it's tied to AP crypto cards. The crucial question is whether these AP cards are emulatable within QEMU. I know QEMU has some support for `vfio-ap`, but I seem to recall that's for *passing through* physical AP cards to guest VMs, which is not what I'm interested in here. Hold on, I seem to recall something - the documentation mentions code paths that are inherently unreachable in virtualized setups like GCE or QEMU, even when software-emulated hardware is involved. Are the AP crypto cards emulated in QEMU? I think I need to revisit the QEMU documentation. I need to figure out if there is any software emulation available for the AP bus itself. |
| 10/2 | 2026/08/07 23:17 | tool | grepper |
0mArgs:{
"Expression": "ap_config_info",
"PathPrefix": "drivers/s390/crypto/"
}Results: {
"Output": "drivers/s390/crypto/ap_bus.c=105=static DECLARE_COMPLETION(ap_apqn_bindings_complete);\ndrivers/s390/crypto/ap_bus.c-106-\ndrivers/s390/crypto/ap_bus.c:107:static struct ap_config_info qci[2];\ndrivers/s390/crypto/ap_bus.c:108:static struct ap_config_info *const ap_qci_info = \u0026qci[0];\ndrivers/s390/crypto/ap_bus.c:109:static struct ap_config_info *const ap_qci_info_old = \u0026qci[1];\ndrivers/s390/crypto/ap_bus.c-110-\n--\ndrivers/s390/crypto/ap_bus.c=2311=static bool ap_get_configuration(void)\n--\ndrivers/s390/crypto/ap_bus.c-2319-\treturn memcmp(ap_qci_info, ap_qci_info_old,\ndrivers/s390/crypto/ap_bus.c:2320:\t\t sizeof(struct ap_config_info)) != 0;\ndrivers/s390/crypto/ap_bus.c-2321-}\n--\ndrivers/s390/crypto/ap_bus.h=135=struct ap_driver {\n--\ndrivers/s390/crypto/ap_bus.h-148-\t */\ndrivers/s390/crypto/ap_bus.h:149:\tvoid (*on_config_changed)(struct ap_config_info *new_config_info,\ndrivers/s390/crypto/ap_bus.h:150:\t\t\t\t struct ap_config_info *old_config_info);\ndrivers/s390/crypto/ap_bus.h-151-\t/*\n--\ndrivers/s390/crypto/ap_bus.h-156-\t */\ndrivers/s390/crypto/ap_bus.h:157:\tvoid (*on_scan_complete)(struct ap_config_info *new_config_info,\ndrivers/s390/crypto/ap_bus.h:158:\t\t\t\t struct ap_config_info *old_config_info);\ndrivers/s390/crypto/ap_bus.h-159-};\n--\ndrivers/s390/crypto/vfio_ap_ops.c=581=static int handle_pqap(struct kvm_vcpu *vcpu)\n--\ndrivers/s390/crypto/vfio_ap_ops.c-644-\ndrivers/s390/crypto/vfio_ap_ops.c:645:static void vfio_ap_matrix_init(struct ap_config_info *info,\ndrivers/s390/crypto/vfio_ap_ops.c-646-\t\t\t\tstruct ap_matrix *matrix)\n--\ndrivers/s390/crypto/vfio_ap_ops.c=2598=static void vfio_ap_mdev_cfg_remove(unsigned long *ap_remove,\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2638- */\ndrivers/s390/crypto/vfio_ap_ops.c:2639:static void vfio_ap_mdev_on_cfg_remove(struct ap_config_info *cur_config_info,\ndrivers/s390/crypto/vfio_ap_ops.c:2640:\t\t\t\t struct ap_config_info *prev_config_info)\ndrivers/s390/crypto/vfio_ap_ops.c-2641-{\n--\ndrivers/s390/crypto/vfio_ap_ops.c=2741=static void vfio_ap_mdev_cfg_add(unsigned long *apm_add, unsigned long *aqm_add,\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2771- */\ndrivers/s390/crypto/vfio_ap_ops.c:2772:static void vfio_ap_mdev_on_cfg_add(struct ap_config_info *cur_config_info,\ndrivers/s390/crypto/vfio_ap_ops.c:2773:\t\t\t\t struct ap_config_info *prev_config_info)\ndrivers/s390/crypto/vfio_ap_ops.c-2774-{\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2803- */\ndrivers/s390/crypto/vfio_ap_ops.c:2804:void vfio_ap_on_cfg_changed(struct ap_config_info *cur_cfg_info,\ndrivers/s390/crypto/vfio_ap_ops.c:2805:\t\t\t struct ap_config_info *prev_cfg_info)\ndrivers/s390/crypto/vfio_ap_ops.c-2806-{\n--\ndrivers/s390/crypto/vfio_ap_ops.c=2819=static void vfio_ap_mdev_hot_plug_cfg(struct ap_matrix_mdev *matrix_mdev)\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2848-\ndrivers/s390/crypto/vfio_ap_ops.c:2849:void vfio_ap_on_scan_complete(struct ap_config_info *new_config_info,\ndrivers/s390/crypto/vfio_ap_ops.c:2850:\t\t\t struct ap_config_info *old_config_info)\ndrivers/s390/crypto/vfio_ap_ops.c-2851-{\n--\ndrivers/s390/crypto/vfio_ap_private.h=47=struct ap_matrix_dev {\ndrivers/s390/crypto/vfio_ap_private.h-48-\tstruct device device;\ndrivers/s390/crypto/vfio_ap_private.h:49:\tstruct ap_config_info info;\ndrivers/s390/crypto/vfio_ap_private.h-50-\tstruct list_head mdev_list;\n--\ndrivers/s390/crypto/vfio_ap_private.h=161=int vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm);\ndrivers/s390/crypto/vfio_ap_private.h-162-\ndrivers/s390/crypto/vfio_ap_private.h:163:void vfio_ap_on_cfg_changed(struct ap_config_info *new_config_info,\ndrivers/s390/crypto/vfio_ap_private.h:164:\t\t\t struct ap_config_info *old_config_info);\ndrivers/s390/crypto/vfio_ap_private.h:165:void vfio_ap_on_scan_complete(struct ap_config_info *new_config_info,\ndrivers/s390/crypto/vfio_ap_private.h:166:\t\t\t struct ap_config_info *old_config_info);\ndrivers/s390/crypto/vfio_ap_private.h-167-\n"
} |
| 11/2 | 2026/08/07 23:17 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 7692 output: 39 thoughts: 140 Thoughts: **Analyzing the VFIO-AP Configuration Removal** Okay, so I'm digging into this `vfio_ap_mdev_cfg_remove` function. I see it's buried in `drivers/s390/crypto/vfio_ap_ops.c`. Seems straightforward enough initially. Tracing the calls, I see `vfio_ap_mdev_cfg_remove` is invoked by `vfio_ap_mdev_on_cfg_remove`, which in turn, is called from `vfio_ap_on_cfg_changed`. Ah, that makes sense. `vfio_ap_on_cfg_changed` is the callback function, registered in `vfio_ap_drv` as `on_config_changed`. So this whole sequence is how the driver reacts to AP configuration changes. My immediate question is, can this entire sequence be triggered without actual physical AP hardware being involved? Is there a sysfs interface or some other mechanism that could fake or simulate these configuration changes? Or is this change exclusively hardware-driven? I need to figure out the possible attack vectors related to triggering this, to see if I can trigger this code path from userspace. |
| 12/2 | 2026/08/07 23:17 | tool | grepper |
0mArgs:{
"Expression": "vfio_ap_on_cfg_changed",
"PathPrefix": "drivers/s390/crypto/"
}Results: {
"Output": "drivers/s390/crypto/vfio_ap_drv.c=58=static struct ap_driver vfio_ap_drv = {\n--\ndrivers/s390/crypto/vfio_ap_drv.c-61-\t.in_use = vfio_ap_mdev_resource_in_use,\ndrivers/s390/crypto/vfio_ap_drv.c:62:\t.on_config_changed = vfio_ap_on_cfg_changed,\ndrivers/s390/crypto/vfio_ap_drv.c-63-\t.on_scan_complete = vfio_ap_on_scan_complete,\n--\ndrivers/s390/crypto/vfio_ap_ops.c=2772=static void vfio_ap_mdev_on_cfg_add(struct ap_config_info *cur_config_info,\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2797-/**\ndrivers/s390/crypto/vfio_ap_ops.c:2798: * vfio_ap_on_cfg_changed - handles notification of changes to the host AP\ndrivers/s390/crypto/vfio_ap_ops.c-2799- *\t\t\t configuration.\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2803- */\ndrivers/s390/crypto/vfio_ap_ops.c:2804:void vfio_ap_on_cfg_changed(struct ap_config_info *cur_cfg_info,\ndrivers/s390/crypto/vfio_ap_ops.c-2805-\t\t\t struct ap_config_info *prev_cfg_info)\n--\ndrivers/s390/crypto/vfio_ap_private.h=161=int vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm);\ndrivers/s390/crypto/vfio_ap_private.h-162-\ndrivers/s390/crypto/vfio_ap_private.h:163:void vfio_ap_on_cfg_changed(struct ap_config_info *new_config_info,\ndrivers/s390/crypto/vfio_ap_private.h-164-\t\t\t struct ap_config_info *old_config_info);\n"
} |
| 13/2 | 2026/08/07 23:17 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 8728 output: 39 thoughts: 25 Thoughts: Okay, here's my interpretation of that thought process, tailored for an expert audience, and written in the first person: **Digging into the Configuration Change Mechanism** Right, so we're dealing with a configuration change. Where does the system actually *react* to these changes? My gut tells me that `on_config_changed` is the key function. Let's see if we can find its call sites, and in what context the configuration updates are being performed. I need to understand the control flow, so I'm going to start by diving into the `ap_bus.c` file. This should give me a good handle on what other modules are responsible for handling config updates, and how they relate to this one. I'm hoping to get a clearer picture of the propagation of the configuration data. |
| 14/2 | 2026/08/07 23:17 | tool | grepper |
0mArgs:{
"Expression": "on_config_changed",
"PathPrefix": "drivers/s390/crypto/ap_bus.c"
}Results: {
"Output": "drivers/s390/crypto/ap_bus.c=1923=static int __drv_notify_config_changed(struct device_driver *drv, void *data)\n--\ndrivers/s390/crypto/ap_bus.c-1927-\tif (try_module_get(drv-\u003eowner)) {\ndrivers/s390/crypto/ap_bus.c:1928:\t\tif (ap_drv-\u003eon_config_changed)\ndrivers/s390/crypto/ap_bus.c:1929:\t\t\tap_drv-\u003eon_config_changed(ap_qci_info, ap_qci_info_old);\ndrivers/s390/crypto/ap_bus.c-1930-\t\tmodule_put(drv-\u003eowner);\n"
} |
| 15/2 | 2026/08/07 23:17 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 9168 output: 42 thoughts: 18 Thoughts: Okay, here's my summary, taking the perspective of someone knowledgeable in the field, and following your instructions: **Tracing the Origins of a Configuration Change Notification** Alright, let's dive into this. The objective is to figure out the upstream callers of `__drv_notify_config_changed`. I need to understand what's triggering this notification. Knowing where this function is called will give me a critical understanding of the system's dynamic configuration management. It is important to know which parts of the system are responsible for initiating these changes. |
| 16/2 | 2026/08/07 23:17 | tool | grepper |
0mArgs:{
"Expression": "__drv_notify_config_changed",
"PathPrefix": "drivers/s390/crypto/ap_bus.c"
}Results: {
"Output": "drivers/s390/crypto/ap_bus.c=1916=static int __match_queue_device_with_queue_id(struct device *dev, const void *data)\n--\ndrivers/s390/crypto/ap_bus.c-1922-/* Helper function for notify_config_changed */\ndrivers/s390/crypto/ap_bus.c:1923:static int __drv_notify_config_changed(struct device_driver *drv, void *data)\ndrivers/s390/crypto/ap_bus.c-1924-{\n--\ndrivers/s390/crypto/ap_bus.c=1937=static inline void notify_config_changed(void)\n--\ndrivers/s390/crypto/ap_bus.c-1939-\tbus_for_each_drv(\u0026ap_bus_type, NULL, NULL,\ndrivers/s390/crypto/ap_bus.c:1940:\t\t\t __drv_notify_config_changed);\ndrivers/s390/crypto/ap_bus.c-1941-}\n"
} |
| 17/2 | 2026/08/07 23:17 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 9625 output: 39 thoughts: 15 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: **Tracing the Configuration Change Notification** Okay, so I need to understand the impact of this `notify_config_changed` function. My first step is to trace its invocations. I want to see *where* this notification is being triggered. Knowing the call sites will immediately give me context: What modules are listening? What events are causing a configuration change notification? This is the starting point for understanding its behavior and potential ramifications throughout the system. I'll need to use my usual methods, likely a combination of grep, IDE search, and potentially even some static analysis tools depending on the project. The goal is to build a mental map of its reach. |
| 18/2 | 2026/08/07 23:17 | tool | grepper |
0mArgs:{
"Expression": "notify_config_changed",
"PathPrefix": "drivers/s390/crypto/ap_bus.c"
}Results: {
"Output": "drivers/s390/crypto/ap_bus.c=1916=static int __match_queue_device_with_queue_id(struct device *dev, const void *data)\n--\ndrivers/s390/crypto/ap_bus.c-1921-\ndrivers/s390/crypto/ap_bus.c:1922:/* Helper function for notify_config_changed */\ndrivers/s390/crypto/ap_bus.c:1923:static int __drv_notify_config_changed(struct device_driver *drv, void *data)\ndrivers/s390/crypto/ap_bus.c-1924-{\n--\ndrivers/s390/crypto/ap_bus.c-1936-/* Notify all drivers about an qci config change */\ndrivers/s390/crypto/ap_bus.c:1937:static inline void notify_config_changed(void)\ndrivers/s390/crypto/ap_bus.c-1938-{\ndrivers/s390/crypto/ap_bus.c-1939-\tbus_for_each_drv(\u0026ap_bus_type, NULL, NULL,\ndrivers/s390/crypto/ap_bus.c:1940:\t\t\t __drv_notify_config_changed);\ndrivers/s390/crypto/ap_bus.c-1941-}\n--\ndrivers/s390/crypto/ap_bus.c=2373=static bool ap_scan_bus(void)\n--\ndrivers/s390/crypto/ap_bus.c-2392-\t\t/* post a config change notify */\ndrivers/s390/crypto/ap_bus.c:2393:\t\tnotify_config_changed();\ndrivers/s390/crypto/ap_bus.c-2394-\t}\n"
} |
| 19/2 | 2026/08/07 23:17 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 10302 output: 39 thoughts: 31 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: **Analyzing the Configuration Change Notification Path** Alright, so `ap_scan_bus` is triggering `notify_config_changed`. That's interesting, and it immediately prompts a deeper dive. My initial thought is, "Okay, why is the access point scanning bus generating a configuration change event? What exactly is changing?" I'm assuming there's some interaction there. I need to understand the relationship between the scanning process and the configuration state. The immediate question then becomes: "Where *else* does this function get called?" Identifying the callers of `ap_scan_bus` is key. Understanding the context around these calls will provide essential information, to determine: the system's reaction to the event; the origin of the event's trigger and it's consequence to the configuration. I want to build a complete picture of this interaction. So, my next step is clear – I'm going to trace the call graph and see who the parent functions are, and the overall chain. |
| 20/2 | 2026/08/07 23:17 | tool | grepper |
0mArgs:{
"Expression": "ap_scan_bus",
"PathPrefix": "drivers/s390/crypto/ap_bus.c"
}Results: {
"Output": "drivers/s390/crypto/ap_bus.c=135=MODULE_PARM_DESC(msgpool_min_items, \"AP message pool minimal items\");\n--\ndrivers/s390/crypto/ap_bus.c-139- */\ndrivers/s390/crypto/ap_bus.c:140:static bool ap_scan_bus(void);\ndrivers/s390/crypto/ap_bus.c:141:static bool ap_scan_bus_result; /* result of last ap_scan_bus() */\ndrivers/s390/crypto/ap_bus.c:142:static DEFINE_MUTEX(ap_scan_bus_mutex); /* mutex ap_scan_bus() invocations */\ndrivers/s390/crypto/ap_bus.c:143:static struct task_struct *ap_scan_bus_task; /* thread holding the scan mutex */\ndrivers/s390/crypto/ap_bus.c:144:static atomic64_t ap_scan_bus_count; /* counter ap_scan_bus() invocations */\ndrivers/s390/crypto/ap_bus.c:145:static int ap_scan_bus_time = AP_CONFIG_TIME;\ndrivers/s390/crypto/ap_bus.c:146:static struct timer_list ap_scan_bus_timer;\ndrivers/s390/crypto/ap_bus.c:147:static void ap_scan_bus_wq_callback(struct work_struct *);\ndrivers/s390/crypto/ap_bus.c:148:static DECLARE_WORK(ap_scan_bus_work, ap_scan_bus_wq_callback);\ndrivers/s390/crypto/ap_bus.c-149-\n--\ndrivers/s390/crypto/ap_bus.c=802=static void ap_check_bindings_complete(void)\n--\ndrivers/s390/crypto/ap_bus.c-805-\ndrivers/s390/crypto/ap_bus.c:806:\tif (atomic64_read(\u0026ap_scan_bus_count) \u003e= 1) {\ndrivers/s390/crypto/ap_bus.c-807-\t\tap_calc_bound_apqns(\u0026apqns, \u0026bound);\n--\ndrivers/s390/crypto/ap_bus.c=1119=bool ap_bus_force_rescan(void)\ndrivers/s390/crypto/ap_bus.c-1120-{\ndrivers/s390/crypto/ap_bus.c:1121:\tunsigned long scan_counter = atomic64_read(\u0026ap_scan_bus_count);\ndrivers/s390/crypto/ap_bus.c-1122-\tbool rc = false;\n--\ndrivers/s390/crypto/ap_bus.c-1136-\t */\ndrivers/s390/crypto/ap_bus.c:1137:\tif (mutex_is_locked(\u0026ap_scan_bus_mutex)) {\ndrivers/s390/crypto/ap_bus.c:1138:\t\tif (ap_scan_bus_task == current)\ndrivers/s390/crypto/ap_bus.c-1139-\t\t\tgoto out;\n--\ndrivers/s390/crypto/ap_bus.c-1142-\t/* Try to acquire the AP scan bus mutex */\ndrivers/s390/crypto/ap_bus.c:1143:\tif (mutex_trylock(\u0026ap_scan_bus_mutex)) {\ndrivers/s390/crypto/ap_bus.c-1144-\t\t/* mutex acquired, run the AP bus scan */\ndrivers/s390/crypto/ap_bus.c:1145:\t\tap_scan_bus_task = current;\ndrivers/s390/crypto/ap_bus.c:1146:\t\tap_scan_bus_result = ap_scan_bus();\ndrivers/s390/crypto/ap_bus.c:1147:\t\trc = ap_scan_bus_result;\ndrivers/s390/crypto/ap_bus.c:1148:\t\tap_scan_bus_task = NULL;\ndrivers/s390/crypto/ap_bus.c:1149:\t\tmutex_unlock(\u0026ap_scan_bus_mutex);\ndrivers/s390/crypto/ap_bus.c-1150-\t\tgoto out;\n--\ndrivers/s390/crypto/ap_bus.c-1156-\t * for the lock which means the other task has finished and\ndrivers/s390/crypto/ap_bus.c:1157:\t * stored the result in ap_scan_bus_result.\ndrivers/s390/crypto/ap_bus.c-1158-\t */\ndrivers/s390/crypto/ap_bus.c:1159:\tif (mutex_lock_interruptible(\u0026ap_scan_bus_mutex)) {\ndrivers/s390/crypto/ap_bus.c-1160-\t\t/* some error occurred, ignore and go out */\n--\ndrivers/s390/crypto/ap_bus.c-1162-\t}\ndrivers/s390/crypto/ap_bus.c:1163:\trc = ap_scan_bus_result;\ndrivers/s390/crypto/ap_bus.c:1164:\tmutex_unlock(\u0026ap_scan_bus_mutex);\ndrivers/s390/crypto/ap_bus.c-1165-\n--\ndrivers/s390/crypto/ap_bus.c=1398=static ssize_t config_time_show(const struct bus_type *bus, char *buf)\ndrivers/s390/crypto/ap_bus.c-1399-{\ndrivers/s390/crypto/ap_bus.c:1400:\treturn sysfs_emit(buf, \"%d\\n\", ap_scan_bus_time);\ndrivers/s390/crypto/ap_bus.c-1401-}\n--\ndrivers/s390/crypto/ap_bus.c=1403=static ssize_t config_time_store(const struct bus_type *bus,\n--\ndrivers/s390/crypto/ap_bus.c-1409-\t\treturn -EINVAL;\ndrivers/s390/crypto/ap_bus.c:1410:\tap_scan_bus_time = time;\ndrivers/s390/crypto/ap_bus.c:1411:\tmod_timer(\u0026ap_scan_bus_timer, jiffies + ap_scan_bus_time * HZ);\ndrivers/s390/crypto/ap_bus.c-1412-\treturn count;\n--\ndrivers/s390/crypto/ap_bus.c=1705=static ssize_t scans_show(const struct bus_type *bus, char *buf)\ndrivers/s390/crypto/ap_bus.c-1706-{\ndrivers/s390/crypto/ap_bus.c:1707:\treturn sysfs_emit(buf, \"%llu\\n\", atomic64_read(\u0026ap_scan_bus_count));\ndrivers/s390/crypto/ap_bus.c-1708-}\n--\ndrivers/s390/crypto/ap_bus.c=1722=static ssize_t bindings_show(const struct bus_type *bus, char *buf)\n--\ndrivers/s390/crypto/ap_bus.c-1727-\tap_calc_bound_apqns(\u0026apqns, \u0026n);\ndrivers/s390/crypto/ap_bus.c:1728:\tif (atomic64_read(\u0026ap_scan_bus_count) \u003e= 1 \u0026\u0026 n == apqns)\ndrivers/s390/crypto/ap_bus.c-1729-\t\trc = sysfs_emit(buf, \"%u/%u (complete)\\n\", n, apqns);\n--\ndrivers/s390/crypto/ap_bus.c=1959=static inline void notify_scan_complete(void)\n--\ndrivers/s390/crypto/ap_bus.c-1965-/*\ndrivers/s390/crypto/ap_bus.c:1966: * Helper function for ap_scan_bus().\ndrivers/s390/crypto/ap_bus.c-1967- * Remove card device and associated queue devices.\n--\ndrivers/s390/crypto/ap_bus.c=1969=static inline void ap_scan_rm_card_dev_and_queue_devs(struct ap_card *ac)\n--\ndrivers/s390/crypto/ap_bus.c-1977-/*\ndrivers/s390/crypto/ap_bus.c:1978: * Helper function for ap_scan_bus().\ndrivers/s390/crypto/ap_bus.c-1979- * Does the scan bus job for all the domains within\n--\ndrivers/s390/crypto/ap_bus.c=1982=static inline void ap_scan_domains(struct ap_card *ac)\n--\ndrivers/s390/crypto/ap_bus.c-2135-/*\ndrivers/s390/crypto/ap_bus.c:2136: * Helper function for ap_scan_bus().\ndrivers/s390/crypto/ap_bus.c-2137- * Does the scan bus job for the given adapter id.\n--\ndrivers/s390/crypto/ap_bus.c=2351=static bool ap_config_has_new_doms(void)\n--\ndrivers/s390/crypto/ap_bus.c-2366-/**\ndrivers/s390/crypto/ap_bus.c:2367: * ap_scan_bus(): Scan the AP bus for new devices\ndrivers/s390/crypto/ap_bus.c:2368: * Always run under mutex ap_scan_bus_mutex protection\ndrivers/s390/crypto/ap_bus.c-2369- * which needs to get locked/unlocked by the caller!\n--\ndrivers/s390/crypto/ap_bus.c-2372- */\ndrivers/s390/crypto/ap_bus.c:2373:static bool ap_scan_bus(void)\ndrivers/s390/crypto/ap_bus.c-2374-{\n--\ndrivers/s390/crypto/ap_bus.c-2417-\ndrivers/s390/crypto/ap_bus.c:2418:\tif (atomic64_inc_return(\u0026ap_scan_bus_count) == 1) {\ndrivers/s390/crypto/ap_bus.c-2419-\t\tpr_debug(\"init scan complete\\n\");\n--\ndrivers/s390/crypto/ap_bus.c-2424-\ndrivers/s390/crypto/ap_bus.c:2425:\tmod_timer(\u0026ap_scan_bus_timer, jiffies + ap_scan_bus_time * HZ);\ndrivers/s390/crypto/ap_bus.c-2426-\n--\ndrivers/s390/crypto/ap_bus.c-2432-/*\ndrivers/s390/crypto/ap_bus.c:2433: * Callback for the ap_scan_bus_timer\ndrivers/s390/crypto/ap_bus.c:2434: * Runs periodically, workqueue timer (ap_scan_bus_time)\ndrivers/s390/crypto/ap_bus.c-2435- */\ndrivers/s390/crypto/ap_bus.c:2436:static void ap_scan_bus_timer_callback(struct timer_list *unused)\ndrivers/s390/crypto/ap_bus.c-2437-{\n--\ndrivers/s390/crypto/ap_bus.c-2441-\t */\ndrivers/s390/crypto/ap_bus.c:2442:\tqueue_work(system_long_wq, \u0026ap_scan_bus_work);\ndrivers/s390/crypto/ap_bus.c-2443-}\n--\ndrivers/s390/crypto/ap_bus.c-2445-/*\ndrivers/s390/crypto/ap_bus.c:2446: * Callback for the ap_scan_bus_work\ndrivers/s390/crypto/ap_bus.c-2447- */\ndrivers/s390/crypto/ap_bus.c:2448:static void ap_scan_bus_wq_callback(struct work_struct *unused)\ndrivers/s390/crypto/ap_bus.c-2449-{\ndrivers/s390/crypto/ap_bus.c-2450-\t/*\ndrivers/s390/crypto/ap_bus.c:2451:\t * Try to invoke an ap_scan_bus(). If the mutex acquisition\ndrivers/s390/crypto/ap_bus.c-2452-\t * fails there is currently another task already running the\n--\ndrivers/s390/crypto/ap_bus.c-2455-\t * the AP scan bus timer is re-armed which triggers then the\ndrivers/s390/crypto/ap_bus.c:2456:\t * ap_scan_bus_timer_callback which enqueues a work into the\ndrivers/s390/crypto/ap_bus.c-2457-\t * system_long_wq which invokes this function here again.\ndrivers/s390/crypto/ap_bus.c-2458-\t */\ndrivers/s390/crypto/ap_bus.c:2459:\tif (mutex_trylock(\u0026ap_scan_bus_mutex)) {\ndrivers/s390/crypto/ap_bus.c:2460:\t\tap_scan_bus_task = current;\ndrivers/s390/crypto/ap_bus.c:2461:\t\tap_scan_bus_result = ap_scan_bus();\ndrivers/s390/crypto/ap_bus.c:2462:\t\tap_scan_bus_task = NULL;\ndrivers/s390/crypto/ap_bus.c:2463:\t\tmutex_unlock(\u0026ap_scan_bus_mutex);\ndrivers/s390/crypto/ap_bus.c-2464-\t}\n--\ndrivers/s390/crypto/ap_bus.c=2467=static inline void __exit ap_async_exit(void)\n--\ndrivers/s390/crypto/ap_bus.c-2471-\tchsc_notifier_unregister(\u0026ap_bus_nb);\ndrivers/s390/crypto/ap_bus.c:2472:\tcancel_work(\u0026ap_scan_bus_work);\ndrivers/s390/crypto/ap_bus.c-2473-\thrtimer_cancel(\u0026ap_poll_timer);\ndrivers/s390/crypto/ap_bus.c:2474:\ttimer_delete(\u0026ap_scan_bus_timer);\ndrivers/s390/crypto/ap_bus.c-2475-}\n--\ndrivers/s390/crypto/ap_bus.c=2477=static inline int __init ap_async_init(void)\n--\ndrivers/s390/crypto/ap_bus.c-2481-\t/* Setup the AP bus rescan timer. */\ndrivers/s390/crypto/ap_bus.c:2482:\ttimer_setup(\u0026ap_scan_bus_timer, ap_scan_bus_timer_callback, 0);\ndrivers/s390/crypto/ap_bus.c-2483-\n--\ndrivers/s390/crypto/ap_bus.c-2491-\ndrivers/s390/crypto/ap_bus.c:2492:\tqueue_work(system_long_wq, \u0026ap_scan_bus_work);\ndrivers/s390/crypto/ap_bus.c-2493-\n--\ndrivers/s390/crypto/ap_bus.c-2510-out:\ndrivers/s390/crypto/ap_bus.c:2511:\tcancel_work(\u0026ap_scan_bus_work);\ndrivers/s390/crypto/ap_bus.c-2512-\thrtimer_cancel(\u0026ap_poll_timer);\ndrivers/s390/crypto/ap_bus.c:2513:\ttimer_delete(\u0026ap_scan_bus_timer);\ndrivers/s390/crypto/ap_bus.c-2514-\treturn rc;\n"
} |
| 21/2 | 2026/08/07 23:17 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 14833 output: 39 thoughts: 106 Thoughts: **Analyzing the Configuration Update Process** Okay, so I'm diving into this `ap_scan_bus` function. It seems to be the central point for detecting configuration changes. I see that it's triggered either periodically by a timer or, more directly, by a forced rescan through `ap_bus_force_rescan`. That makes sense; a regular check and an immediate update when needed. The critical piece here is that `ap_scan_bus` calls `notify_config_changed` *only* if `ap_get_configuration` returns true. That "true" value clearly indicates a configuration change has been detected. Now, I need to figure out how `ap_get_configuration` actually *determines* if the configuration is different. I'm seeing it uses `ap_qci_info` and `ap_qci_info_old` – presumably, these are representations of the current and previous configurations, respectively. So, the core logic must be some kind of comparison between these two structures. I'll need to understand exactly how `ap_get_configuration` leverages `ap_qci_info` and `ap_qci_info_old` to make that determination. Let's see how it gets the configuration data. |
| 22/2 | 2026/08/07 23:17 | tool | grepper |
0mArgs:{
"Expression": "ap_get_configuration",
"PathPrefix": "drivers/s390/crypto/ap_bus.c"
}Results: {
"Output": "drivers/s390/crypto/ap_bus.c=2139=static inline void ap_scan_adapter(int ap)\n--\ndrivers/s390/crypto/ap_bus.c-2301-/**\ndrivers/s390/crypto/ap_bus.c:2302: * ap_get_configuration - get the host AP configuration\ndrivers/s390/crypto/ap_bus.c-2303- *\n--\ndrivers/s390/crypto/ap_bus.c-2310- */\ndrivers/s390/crypto/ap_bus.c:2311:static bool ap_get_configuration(void)\ndrivers/s390/crypto/ap_bus.c-2312-{\n--\ndrivers/s390/crypto/ap_bus.c=2373=static bool ap_scan_bus(void)\n--\ndrivers/s390/crypto/ap_bus.c-2380-\t/* (re-)fetch configuration via QCI */\ndrivers/s390/crypto/ap_bus.c:2381:\tconfig_changed = ap_get_configuration();\ndrivers/s390/crypto/ap_bus.c-2382-\tif (config_changed) {\n"
} |
| 23/2 | 2026/08/07 23:17 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 15575 output: 43 thoughts: 14 Thoughts: Okay, let's dive into this. Here's my take on understanding the inner workings, as if these are my own thoughts: **Dissecting `ap_get_configuration`** Alright, so I'm focusing in on the implementation of this `ap_get_configuration` function. I need to understand exactly how this thing works. What are the key elements it needs to deal with? I'm thinking about the data structures involved, and how it navigates whatever configuration sources are in play. Is it pulling from a file? A database? Environment variables? I need to figure out what takes priority if there are overlaps. I'm probably going to need to look at how it handles error conditions and how it decides what information is relevant to return, depending on the context. If it's returning config that affects specific modules, I need to understand how the module context is being provided. I'll be looking for any hints about efficiency. Does it cache results? Does it use lazy loading? I want to know about potential performance bottlenecks. Most importantly, how robust is it? Can it handle unexpected inputs gracefully? I need to ensure it's not a single point of failure. I’m particularly curious about the security implications. Can it be tricked into exposing sensitive information? Does it properly sanitize inputs? This is crucial for any configuration function. It's time to dig in and see what’s going on under the hood. |
| 24/2 | 2026/08/07 23:17 | tool | read-file |
0mArgs:{
"File": "drivers/s390/crypto/ap_bus.c",
"FirstLine": 2300,
"LineCount": 30
}Results: {
"Contents": "2300:\t\n2301:\t/**\n2302:\t * ap_get_configuration - get the host AP configuration\n2303:\t *\n2304:\t * Stores the host AP configuration information returned from the previous call\n2305:\t * to Query Configuration Information (QCI), then retrieves and stores the\n2306:\t * current AP configuration returned from QCI.\n2307:\t *\n2308:\t * Return: true if the host AP configuration changed between calls to QCI;\n2309:\t * otherwise, return false.\n2310:\t */\n2311:\tstatic bool ap_get_configuration(void)\n2312:\t{\n2313:\t\tif (!ap_qci_info-\u003eflags)\t/* QCI not supported */\n2314:\t\t\treturn false;\n2315:\t\n2316:\t\tmemcpy(ap_qci_info_old, ap_qci_info, sizeof(*ap_qci_info));\n2317:\t\tap_qci(ap_qci_info);\n2318:\t\n2319:\t\treturn memcmp(ap_qci_info, ap_qci_info_old,\n2320:\t\t\t sizeof(struct ap_config_info)) != 0;\n2321:\t}\n2322:\t\n2323:\t/*\n2324:\t * ap_config_has_new_aps - Check current against old qci info if\n2325:\t * new adapters have appeared. Returns true if at least one new\n2326:\t * adapter in the apm mask is showing up. Existing adapters or\n2327:\t * receding adapters are not counted.\n2328:\t */\n2329:\tstatic bool ap_config_has_new_aps(void)\n"
} |
| 25/2 | 2026/08/07 23:17 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 16405 output: 33 thoughts: 22 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: **Analyzing the `ap_qci` Function** Okay, so the program's calling `ap_qci`. Right, let's dive into that function and see what's happening. My immediate focus is on its intended purpose and the context in which it's being invoked. Is it related to active probing, quality of connection indication, or something else entirely? The name itself suggests a potential link to Active Probe Quality of Connection Indicator (AP-QCI), which would likely point to active measurement of network quality metrics. But, of course, the name can be misleading! I'll be looking for clues in the function's implementation: the input parameters, any conditional logic, whether it interacts with hardware registers, performs data packet manipulation, or leverages any existing configuration parameters. Any clues within the surrounding code or any associated comments. I need to understand its role in this specific system. Is this a critical path function that might be performance-sensitive? Or is it more of a diagnostic or reporting function? The answer to that question will influence how deep I need to dig into the details. |
| 26/2 | 2026/08/07 23:17 | tool | grepper |
0mArgs:{
"Expression": "ap_qci",
"PathPrefix": "drivers/s390/crypto/"
}Results: {
"Output": "drivers/s390/crypto/ap_bus.c=107=static struct ap_config_info qci[2];\ndrivers/s390/crypto/ap_bus.c:108:static struct ap_config_info *const ap_qci_info = \u0026qci[0];\ndrivers/s390/crypto/ap_bus.c:109:static struct ap_config_info *const ap_qci_info_old = \u0026qci[1];\ndrivers/s390/crypto/ap_bus.c-110-\n--\ndrivers/s390/crypto/ap_bus.c=209=static int ap_interrupts_available(void)\n--\ndrivers/s390/crypto/ap_bus.c-214-/**\ndrivers/s390/crypto/ap_bus.c:215: * ap_qci_available(): Test if AP configuration\ndrivers/s390/crypto/ap_bus.c-216- * information can be queried via QCI subfunction.\n--\ndrivers/s390/crypto/ap_bus.c-219- */\ndrivers/s390/crypto/ap_bus.c:220:static int ap_qci_available(void)\ndrivers/s390/crypto/ap_bus.c-221-{\n--\ndrivers/s390/crypto/ap_bus.c=241=static inline int ap_qact_available(void)\ndrivers/s390/crypto/ap_bus.c-242-{\ndrivers/s390/crypto/ap_bus.c:243:\treturn ap_qci_info-\u003eqact;\ndrivers/s390/crypto/ap_bus.c-244-}\n--\ndrivers/s390/crypto/ap_bus.c=251=int ap_sb_available(void)\ndrivers/s390/crypto/ap_bus.c-252-{\ndrivers/s390/crypto/ap_bus.c:253:\treturn ap_qci_info-\u003eapsb;\ndrivers/s390/crypto/ap_bus.c-254-}\n--\ndrivers/s390/crypto/ap_bus.c=270=static void __init ap_init_qci_info(void)\ndrivers/s390/crypto/ap_bus.c-271-{\ndrivers/s390/crypto/ap_bus.c:272:\tif (!ap_qci_available() ||\ndrivers/s390/crypto/ap_bus.c:273:\t ap_qci(ap_qci_info)) {\ndrivers/s390/crypto/ap_bus.c-274-\t\tAP_DBF_INFO(\"%s QCI not supported\\n\", __func__);\n--\ndrivers/s390/crypto/ap_bus.c-276-\t}\ndrivers/s390/crypto/ap_bus.c:277:\tmemcpy(ap_qci_info_old, ap_qci_info, sizeof(*ap_qci_info));\ndrivers/s390/crypto/ap_bus.c-278-\tAP_DBF_INFO(\"%s successful fetched initial qci info\\n\", __func__);\ndrivers/s390/crypto/ap_bus.c-279-\ndrivers/s390/crypto/ap_bus.c:280:\tif (ap_qci_info-\u003eapxa) {\ndrivers/s390/crypto/ap_bus.c:281:\t\tif (ap_qci_info-\u003ena) {\ndrivers/s390/crypto/ap_bus.c:282:\t\t\tap_max_adapter_id = ap_qci_info-\u003ena;\ndrivers/s390/crypto/ap_bus.c-283-\t\t\tAP_DBF_INFO(\"%s new ap_max_adapter_id is %d\\n\",\n--\ndrivers/s390/crypto/ap_bus.c-285-\t\t}\ndrivers/s390/crypto/ap_bus.c:286:\t\tif (ap_qci_info-\u003end) {\ndrivers/s390/crypto/ap_bus.c:287:\t\t\tap_max_domain_id = ap_qci_info-\u003end;\ndrivers/s390/crypto/ap_bus.c-288-\t\t\tAP_DBF_INFO(\"%s new ap_max_domain_id is %d\\n\",\n--\ndrivers/s390/crypto/ap_bus.c=310=static inline int ap_test_config_card_id(unsigned int id)\n--\ndrivers/s390/crypto/ap_bus.c-313-\t\treturn 0;\ndrivers/s390/crypto/ap_bus.c:314:\tif (ap_qci_info-\u003eflags)\ndrivers/s390/crypto/ap_bus.c:315:\t\treturn ap_test_config(ap_qci_info-\u003eapm, id);\ndrivers/s390/crypto/ap_bus.c-316-\treturn 1;\n--\ndrivers/s390/crypto/ap_bus.c=327=int ap_test_config_usage_domain(unsigned int domain)\n--\ndrivers/s390/crypto/ap_bus.c-330-\t\treturn 0;\ndrivers/s390/crypto/ap_bus.c:331:\tif (ap_qci_info-\u003eflags)\ndrivers/s390/crypto/ap_bus.c:332:\t\treturn ap_test_config(ap_qci_info-\u003eaqm, domain);\ndrivers/s390/crypto/ap_bus.c-333-\treturn 1;\n--\ndrivers/s390/crypto/ap_bus.c=345=int ap_test_config_ctrl_domain(unsigned int domain)\ndrivers/s390/crypto/ap_bus.c-346-{\ndrivers/s390/crypto/ap_bus.c:347:\tif (!ap_qci_info || domain \u003e ap_max_domain_id)\ndrivers/s390/crypto/ap_bus.c-348-\t\treturn 0;\ndrivers/s390/crypto/ap_bus.c:349:\treturn ap_test_config(ap_qci_info-\u003eadm, domain);\ndrivers/s390/crypto/ap_bus.c-350-}\n--\ndrivers/s390/crypto/ap_bus.c=1349=static ssize_t ap_control_domain_mask_show(const struct bus_type *bus, char *buf)\ndrivers/s390/crypto/ap_bus.c-1350-{\ndrivers/s390/crypto/ap_bus.c:1351:\tif (!ap_qci_info-\u003eflags)\t/* QCI not supported */\ndrivers/s390/crypto/ap_bus.c-1352-\t\treturn sysfs_emit(buf, \"not supported\\n\");\n--\ndrivers/s390/crypto/ap_bus.c-1354-\treturn sysfs_emit(buf, \"0x%08x%08x%08x%08x%08x%08x%08x%08x\\n\",\ndrivers/s390/crypto/ap_bus.c:1355:\t\t\t ap_qci_info-\u003eadm[0], ap_qci_info-\u003eadm[1],\ndrivers/s390/crypto/ap_bus.c:1356:\t\t\t ap_qci_info-\u003eadm[2], ap_qci_info-\u003eadm[3],\ndrivers/s390/crypto/ap_bus.c:1357:\t\t\t ap_qci_info-\u003eadm[4], ap_qci_info-\u003eadm[5],\ndrivers/s390/crypto/ap_bus.c:1358:\t\t\t ap_qci_info-\u003eadm[6], ap_qci_info-\u003eadm[7]);\ndrivers/s390/crypto/ap_bus.c-1359-}\n--\ndrivers/s390/crypto/ap_bus.c=1363=static ssize_t ap_usage_domain_mask_show(const struct bus_type *bus, char *buf)\ndrivers/s390/crypto/ap_bus.c-1364-{\ndrivers/s390/crypto/ap_bus.c:1365:\tif (!ap_qci_info-\u003eflags)\t/* QCI not supported */\ndrivers/s390/crypto/ap_bus.c-1366-\t\treturn sysfs_emit(buf, \"not supported\\n\");\n--\ndrivers/s390/crypto/ap_bus.c-1368-\treturn sysfs_emit(buf, \"0x%08x%08x%08x%08x%08x%08x%08x%08x\\n\",\ndrivers/s390/crypto/ap_bus.c:1369:\t\t\t ap_qci_info-\u003eaqm[0], ap_qci_info-\u003eaqm[1],\ndrivers/s390/crypto/ap_bus.c:1370:\t\t\t ap_qci_info-\u003eaqm[2], ap_qci_info-\u003eaqm[3],\ndrivers/s390/crypto/ap_bus.c:1371:\t\t\t ap_qci_info-\u003eaqm[4], ap_qci_info-\u003eaqm[5],\ndrivers/s390/crypto/ap_bus.c:1372:\t\t\t ap_qci_info-\u003eaqm[6], ap_qci_info-\u003eaqm[7]);\ndrivers/s390/crypto/ap_bus.c-1373-}\n--\ndrivers/s390/crypto/ap_bus.c=1377=static ssize_t ap_adapter_mask_show(const struct bus_type *bus, char *buf)\ndrivers/s390/crypto/ap_bus.c-1378-{\ndrivers/s390/crypto/ap_bus.c:1379:\tif (!ap_qci_info-\u003eflags)\t/* QCI not supported */\ndrivers/s390/crypto/ap_bus.c-1380-\t\treturn sysfs_emit(buf, \"not supported\\n\");\n--\ndrivers/s390/crypto/ap_bus.c-1382-\treturn sysfs_emit(buf, \"0x%08x%08x%08x%08x%08x%08x%08x%08x\\n\",\ndrivers/s390/crypto/ap_bus.c:1383:\t\t\t ap_qci_info-\u003eapm[0], ap_qci_info-\u003eapm[1],\ndrivers/s390/crypto/ap_bus.c:1384:\t\t\t ap_qci_info-\u003eapm[2], ap_qci_info-\u003eapm[3],\ndrivers/s390/crypto/ap_bus.c:1385:\t\t\t ap_qci_info-\u003eapm[4], ap_qci_info-\u003eapm[5],\ndrivers/s390/crypto/ap_bus.c:1386:\t\t\t ap_qci_info-\u003eapm[6], ap_qci_info-\u003eapm[7]);\ndrivers/s390/crypto/ap_bus.c-1387-}\n--\ndrivers/s390/crypto/ap_bus.c=1747=static ssize_t features_show(const struct bus_type *bus, char *buf)\n--\ndrivers/s390/crypto/ap_bus.c-1750-\ndrivers/s390/crypto/ap_bus.c:1751:\tif (!ap_qci_info-\u003eflags)\t/* QCI not supported */\ndrivers/s390/crypto/ap_bus.c-1752-\t\treturn sysfs_emit(buf, \"-\\n\");\ndrivers/s390/crypto/ap_bus.c-1753-\ndrivers/s390/crypto/ap_bus.c:1754:\tif (ap_qci_info-\u003eapsc)\ndrivers/s390/crypto/ap_bus.c-1755-\t\tn += sysfs_emit_at(buf, n, \"APSC \");\ndrivers/s390/crypto/ap_bus.c:1756:\tif (ap_qci_info-\u003eapxa)\ndrivers/s390/crypto/ap_bus.c-1757-\t\tn += sysfs_emit_at(buf, n, \"APXA \");\ndrivers/s390/crypto/ap_bus.c:1758:\tif (ap_qci_info-\u003eqact)\ndrivers/s390/crypto/ap_bus.c-1759-\t\tn += sysfs_emit_at(buf, n, \"QACT \");\ndrivers/s390/crypto/ap_bus.c:1760:\tif (ap_qci_info-\u003erc8a)\ndrivers/s390/crypto/ap_bus.c-1761-\t\tn += sysfs_emit_at(buf, n, \"RC8A \");\ndrivers/s390/crypto/ap_bus.c:1762:\tif (ap_qci_info-\u003eapsb)\ndrivers/s390/crypto/ap_bus.c-1763-\t\tn += sysfs_emit_at(buf, n, \"APSB \");\n--\ndrivers/s390/crypto/ap_bus.c=1923=static int __drv_notify_config_changed(struct device_driver *drv, void *data)\n--\ndrivers/s390/crypto/ap_bus.c-1928-\t\tif (ap_drv-\u003eon_config_changed)\ndrivers/s390/crypto/ap_bus.c:1929:\t\t\tap_drv-\u003eon_config_changed(ap_qci_info, ap_qci_info_old);\ndrivers/s390/crypto/ap_bus.c-1930-\t\tmodule_put(drv-\u003eowner);\n--\ndrivers/s390/crypto/ap_bus.c=1944=static int __drv_notify_scan_complete(struct device_driver *drv, void *data)\n--\ndrivers/s390/crypto/ap_bus.c-1949-\t\tif (ap_drv-\u003eon_scan_complete)\ndrivers/s390/crypto/ap_bus.c:1950:\t\t\tap_drv-\u003eon_scan_complete(ap_qci_info,\ndrivers/s390/crypto/ap_bus.c:1951:\t\t\t\t\t\t ap_qci_info_old);\ndrivers/s390/crypto/ap_bus.c-1952-\t\tmodule_put(drv-\u003eowner);\n--\ndrivers/s390/crypto/ap_bus.c=2311=static bool ap_get_configuration(void)\ndrivers/s390/crypto/ap_bus.c-2312-{\ndrivers/s390/crypto/ap_bus.c:2313:\tif (!ap_qci_info-\u003eflags)\t/* QCI not supported */\ndrivers/s390/crypto/ap_bus.c-2314-\t\treturn false;\ndrivers/s390/crypto/ap_bus.c-2315-\ndrivers/s390/crypto/ap_bus.c:2316:\tmemcpy(ap_qci_info_old, ap_qci_info, sizeof(*ap_qci_info));\ndrivers/s390/crypto/ap_bus.c:2317:\tap_qci(ap_qci_info);\ndrivers/s390/crypto/ap_bus.c-2318-\ndrivers/s390/crypto/ap_bus.c:2319:\treturn memcmp(ap_qci_info, ap_qci_info_old,\ndrivers/s390/crypto/ap_bus.c-2320-\t\t sizeof(struct ap_config_info)) != 0;\n--\ndrivers/s390/crypto/ap_bus.c=2329=static bool ap_config_has_new_aps(void)\n--\ndrivers/s390/crypto/ap_bus.c-2333-\ndrivers/s390/crypto/ap_bus.c:2334:\tif (!ap_qci_info-\u003eflags)\ndrivers/s390/crypto/ap_bus.c-2335-\t\treturn false;\ndrivers/s390/crypto/ap_bus.c-2336-\ndrivers/s390/crypto/ap_bus.c:2337:\tbitmap_andnot(m, (unsigned long *)ap_qci_info-\u003eapm,\ndrivers/s390/crypto/ap_bus.c:2338:\t\t (unsigned long *)ap_qci_info_old-\u003eapm, AP_DEVICES);\ndrivers/s390/crypto/ap_bus.c-2339-\tif (!bitmap_empty(m, AP_DEVICES))\n--\ndrivers/s390/crypto/ap_bus.c=2351=static bool ap_config_has_new_doms(void)\n--\ndrivers/s390/crypto/ap_bus.c-2354-\ndrivers/s390/crypto/ap_bus.c:2355:\tif (!ap_qci_info-\u003eflags)\ndrivers/s390/crypto/ap_bus.c-2356-\t\treturn false;\ndrivers/s390/crypto/ap_bus.c-2357-\ndrivers/s390/crypto/ap_bus.c:2358:\tbitmap_andnot(m, (unsigned long *)ap_qci_info-\u003eaqm,\ndrivers/s390/crypto/ap_bus.c:2359:\t\t (unsigned long *)ap_qci_info_old-\u003eaqm, AP_DOMAINS);\ndrivers/s390/crypto/ap_bus.c-2360-\tif (!bitmap_empty(m, AP_DOMAINS))\n--\ndrivers/s390/crypto/vfio_ap_drv.c=86=static int vfio_ap_matrix_dev_create(void)\n--\ndrivers/s390/crypto/vfio_ap_drv.c-106-\tif (test_facility(12)) {\ndrivers/s390/crypto/vfio_ap_drv.c:107:\t\tret = ap_qci(\u0026matrix_dev-\u003einfo);\ndrivers/s390/crypto/vfio_ap_drv.c-108-\t\tif (ret)\n"
} |
| 27/2 | 2026/08/07 23:17 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 21452 output: 34 thoughts: 14 Thoughts: Okay, here's my interpretation of that thought process, tailored for an expert audience, and presented as if it were my own internal monologue: **My Immediate Assessment of `ap_qci`** Right, `ap_qci`. Okay, so it looks like I'm dealing with a function named `ap_qci`. My initial assumption, given the naming convention, is that this likely involves querying or retrieving configuration information. The "ap" part probably stands for "access point" or something related to it, given that is a standard abbreviation when related to wireless networks. The "qci" is probably the name of the function, and indicates that the function performs queries, or requests information regarding configurations. So, the focus here is on the process of *obtaining* configuration data, rather than any manipulation or alteration of it. Is it a generic configuration lookup, or is it specific to a particular aspect of the access point's configuration? What kind of configuration is it responsible for querying? And, most importantly, what interface does it expose to get the configuration? What is the structure of the data it returns? The input parameters are the key to understanding its scope. |
| 28/2 | 2026/08/07 23:17 | tool | grepper |
0mArgs:{
"Expression": "ap_qci\\(",
"PathPrefix": "drivers/s390/crypto/"
}Results: {
"Output": "drivers/s390/crypto/ap_bus.c=270=static void __init ap_init_qci_info(void)\n--\ndrivers/s390/crypto/ap_bus.c-272-\tif (!ap_qci_available() ||\ndrivers/s390/crypto/ap_bus.c:273:\t ap_qci(ap_qci_info)) {\ndrivers/s390/crypto/ap_bus.c-274-\t\tAP_DBF_INFO(\"%s QCI not supported\\n\", __func__);\n--\ndrivers/s390/crypto/ap_bus.c=2311=static bool ap_get_configuration(void)\n--\ndrivers/s390/crypto/ap_bus.c-2316-\tmemcpy(ap_qci_info_old, ap_qci_info, sizeof(*ap_qci_info));\ndrivers/s390/crypto/ap_bus.c:2317:\tap_qci(ap_qci_info);\ndrivers/s390/crypto/ap_bus.c-2318-\n--\ndrivers/s390/crypto/vfio_ap_drv.c=86=static int vfio_ap_matrix_dev_create(void)\n--\ndrivers/s390/crypto/vfio_ap_drv.c-106-\tif (test_facility(12)) {\ndrivers/s390/crypto/vfio_ap_drv.c:107:\t\tret = ap_qci(\u0026matrix_dev-\u003einfo);\ndrivers/s390/crypto/vfio_ap_drv.c-108-\t\tif (ret)\n"
} |
| 29/2 | 2026/08/07 23:17 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 22178 output: 33 thoughts: 13 Thoughts: Okay, here's my attempt at summarizing that thought process, tailored for an expert audience: **Defining the Enigma: Unpacking `ap_qci`** Alright, so the task at hand is to understand this `ap_qci` thing. First things first, I need to nail down a precise definition. No assumptions, no shortcuts – gotta get the foundation right. I need a concrete, unambiguous explanation. Is it an acronym? Some kind of novel metric? A specific piece of technology? This definition will act as my compass, guiding my further investigation and preventing me from going down any rabbit holes prematurely. The specific definition will provide a framework for all future considerations. |
| 30/2 | 2026/08/07 23:17 | tool | grepper |
0mArgs:{
"Expression": "int ap_qci\\(",
"PathPrefix": "arch/s390/"
}Results: {
"Output": "arch/s390/include/asm/ap.h=239=struct ap_config_info {\n--\narch/s390/include/asm/ap.h-265- */\narch/s390/include/asm/ap.h:266:static inline int ap_qci(struct ap_config_info *config)\narch/s390/include/asm/ap.h-267-{\n"
} |
| 31/2 | 2026/08/07 23:17 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 22484 output: 42 thoughts: 12 Thoughts: Okay, here's my attempt at summarizing that thought process, keeping in mind I'm speaking to a fellow expert: **Delving into the `ap_qci` Definition** Alright, let's get down to brass tacks. I need to refresh my memory on the specifics of this `ap_qci` definition. I've likely encountered this before, but it's crucial to solidify the understanding, especially if I'm building on it or troubleshooting something related to it. My initial thought process is to find the exact definition and documentation so that I can have a common frame of reference. This will allow for a more efficient and accurate discussion when considering its implications. So, let's get into it. |
| 32/2 | 2026/08/07 23:17 | tool | read-file |
0mArgs:{
"File": "arch/s390/include/asm/ap.h",
"FirstLine": 260,
"LineCount": 20
}Results: {
"Contents": " 260:\t\n 261:\t/**\n 262:\t * ap_qci(): Get AP configuration data\n 263:\t *\n 264:\t * Returns 0 on success, or -EOPNOTSUPP.\n 265:\t */\n 266:\tstatic inline int ap_qci(struct ap_config_info *config)\n 267:\t{\n 268:\t\tunsigned long reg0 = 4UL \u003c\u003c 24; /* fc 4UL is QCI */\n 269:\t\tunsigned long reg1 = -EOPNOTSUPP;\n 270:\t\tstruct ap_config_info *reg2 = config;\n 271:\t\n 272:\t\tasm volatile(\n 273:\t\t\t\"\tlgr\t0,%[reg0]\\n\"\t\t/* QCI fc into gr0 */\n 274:\t\t\t\"\tlgr\t2,%[reg2]\\n\"\t\t/* ptr to config into gr2 */\n 275:\t\t\t\"\t.insn\trre,0xb2af0000,0,0\\n\"\t/* PQAP(QCI) */\n 276:\t\t\t\"0:\tla\t%[reg1],0\\n\"\t\t/* good case, QCI fc available */\n 277:\t\t\t\"1:\\n\"\n 278:\t\t\tEX_TABLE(0b, 1b)\n 279:\t\t\t: [reg1] \"+\u0026d\" (reg1)\n"
} |
| 33/2 | 2026/08/07 23:17 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 23070 output: 40 thoughts: 203 Thoughts: **My Assessment of PQAP(QCI) Fuzzing Possibilities** Okay, so `ap_qci` is calling `PQAP(QCI)`. That instruction gets intercepted by the hypervisor – KVM/QEMU, specifically. First thing's first: does QEMU even *support* this `PQAP` interception? Thankfully, yes, QEMU's got that covered. But here's the crucial question: does QEMU's response configuration, as a result of intercepting that instruction, enable the subsequent `ap_get_configuration` to return true? That's the key to triggering what we are interested in. Now, if we are fuzzing via syzkaller, can we trigger that configuration with syzkaller? Ah, tricky. Syzkaller can't *directly* inject `PQAP(QCI)` responses, because it runs inside the guest VM. It would need to be running at the hypervisor level to do that. But wait...Syzkaller is fuzzing the kernel *from user space*. That’s a key distinction. Okay, so, if we cannot use syzkaller to inject PQAP responses, is there *any* user-space interface that might trigger that `vfio_ap_mdev_cfg_remove` that this all relates to? Is there an existing API or a more general way to call `vfio_ap_mdev_cfg_remove`? I’d better go check where that is called from! Let's see if it's called anywhere else that we might be able to exploit from user space. |
| 34/2 | 2026/08/07 23:18 | tool | grepper |
0mArgs:{
"Expression": "vfio_ap_mdev_cfg_remove",
"PathPrefix": "drivers/s390/crypto/"
}Results: {
"Output": "drivers/s390/crypto/vfio_ap_ops.c=2557=static void vfio_ap_mdev_hot_unplug_cfg(struct ap_matrix_mdev *matrix_mdev,\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2585-/**\ndrivers/s390/crypto/vfio_ap_ops.c:2586: * vfio_ap_mdev_cfg_remove - determines which guests are using the adapters,\ndrivers/s390/crypto/vfio_ap_ops.c-2587- *\t\t\t domains and control domains that have been removed\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2597- */\ndrivers/s390/crypto/vfio_ap_ops.c:2598:static void vfio_ap_mdev_cfg_remove(unsigned long *ap_remove,\ndrivers/s390/crypto/vfio_ap_ops.c-2599-\t\t\t\t unsigned long *aq_remove,\n--\ndrivers/s390/crypto/vfio_ap_ops.c=2639=static void vfio_ap_mdev_on_cfg_remove(struct ap_config_info *cur_config_info,\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2660-\tif (do_remove)\ndrivers/s390/crypto/vfio_ap_ops.c:2661:\t\tvfio_ap_mdev_cfg_remove(aprem, aqrem, cdrem);\ndrivers/s390/crypto/vfio_ap_ops.c-2662-}\n"
} |
| 35/2 | 2026/08/07 23:18 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 24095 output: 42 thoughts: 43 Thoughts: Okay, here's my take on those thoughts, framed as an expert's internal monologue: **Investigating the Caller of `vfio_ap_mdev_off_cfg_remove`** Alright, let's see, the code notes that this `vfio_ap_mdev_on_cfg_remove` function is only directly called from `vfio_ap_mdev_on_cfg_remove`. That's a bit unusual, and it makes me wonder. Is that truly the *only* place this is being invoked from? I need to double-check that. I need to make *absolutely* sure there aren't any other call paths, maybe indirectly, that are leading to this function being executed. I'll need to go beyond the immediate call stack to be certain. I'll need to use my tools to thoroughly examine the calling context and verify the assumptions this piece of code is based on. A second set of eyes on this is always beneficial. |
| 36/2 | 2026/08/07 23:18 | tool | grepper |
0mArgs:{
"Expression": "vfio_ap_mdev_on_cfg_remove",
"PathPrefix": "drivers/s390/crypto/"
}Results: {
"Output": "drivers/s390/crypto/vfio_ap_ops.c=2598=static void vfio_ap_mdev_cfg_remove(unsigned long *ap_remove,\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2631-/**\ndrivers/s390/crypto/vfio_ap_ops.c:2632: * vfio_ap_mdev_on_cfg_remove - responds to the removal of adapters, domains and\ndrivers/s390/crypto/vfio_ap_ops.c-2633- *\t\t\t\tcontrol domains from the host AP configuration\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2638- */\ndrivers/s390/crypto/vfio_ap_ops.c:2639:static void vfio_ap_mdev_on_cfg_remove(struct ap_config_info *cur_config_info,\ndrivers/s390/crypto/vfio_ap_ops.c-2640-\t\t\t\t struct ap_config_info *prev_config_info)\n--\ndrivers/s390/crypto/vfio_ap_ops.c=2804=void vfio_ap_on_cfg_changed(struct ap_config_info *cur_cfg_info,\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2811-\ndrivers/s390/crypto/vfio_ap_ops.c:2812:\tvfio_ap_mdev_on_cfg_remove(cur_cfg_info, prev_cfg_info);\ndrivers/s390/crypto/vfio_ap_ops.c-2813-\tvfio_ap_mdev_on_cfg_add(cur_cfg_info, prev_cfg_info);\n"
} |
| 37/2 | 2026/08/07 23:18 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 24852 output: 39 thoughts: 37 Thoughts: Here's my summary, as the thought process you described: **Analyzing `vfio_ap_on_cfg_changed` Callers** Okay, so I'm looking at this function, it's called `vfio_ap_on_cfg_changed`. The code says it's only called from one place: `vfio_ap_on_cfg_changed`. That's interesting, but I need to make sure I'm not missing something. I know the code pretty well, but memory isn't perfect, and there might be a subtle indirect path. So my immediate question is: Is this the *only* callsite for this particular function? I need to double-check that `vfio_ap_on_cfg_changed` is *not* called from anywhere else within the code base. Are there any other paths, even ones that seem indirect, that end up triggering this function call? This is a critical point that needs confirmation before I continue my analysis. |
| 38/2 | 2026/08/07 23:18 | tool | grepper |
0mArgs:{
"Expression": "vfio_ap_on_cfg_changed",
"PathPrefix": "drivers/s390/crypto/"
}Results: {
"Output": "drivers/s390/crypto/vfio_ap_drv.c=58=static struct ap_driver vfio_ap_drv = {\n--\ndrivers/s390/crypto/vfio_ap_drv.c-61-\t.in_use = vfio_ap_mdev_resource_in_use,\ndrivers/s390/crypto/vfio_ap_drv.c:62:\t.on_config_changed = vfio_ap_on_cfg_changed,\ndrivers/s390/crypto/vfio_ap_drv.c-63-\t.on_scan_complete = vfio_ap_on_scan_complete,\n--\ndrivers/s390/crypto/vfio_ap_ops.c=2772=static void vfio_ap_mdev_on_cfg_add(struct ap_config_info *cur_config_info,\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2797-/**\ndrivers/s390/crypto/vfio_ap_ops.c:2798: * vfio_ap_on_cfg_changed - handles notification of changes to the host AP\ndrivers/s390/crypto/vfio_ap_ops.c-2799- *\t\t\t configuration.\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2803- */\ndrivers/s390/crypto/vfio_ap_ops.c:2804:void vfio_ap_on_cfg_changed(struct ap_config_info *cur_cfg_info,\ndrivers/s390/crypto/vfio_ap_ops.c-2805-\t\t\t struct ap_config_info *prev_cfg_info)\n--\ndrivers/s390/crypto/vfio_ap_private.h=161=int vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm);\ndrivers/s390/crypto/vfio_ap_private.h-162-\ndrivers/s390/crypto/vfio_ap_private.h:163:void vfio_ap_on_cfg_changed(struct ap_config_info *new_config_info,\ndrivers/s390/crypto/vfio_ap_private.h-164-\t\t\t struct ap_config_info *old_config_info);\n"
} |
| 39/2 | 2026/08/07 23:18 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 25742 output: 37 thoughts: 105 Thoughts: **My Analysis of the VFIO-AP Driver Configuration Change Mechanism** Okay, so I'm digging into how the configuration change events are handled within the `vfio_ap_drv` driver. My initial observation is that the core mechanism seems to be rooted in the `.on_config_changed` callback. That's the key entry point, the thing that gets triggered when something *actually* changes. And then I'm tracing that callback – it's called by `__drv_notify_config_changed`. That function, in turn, is invoked by `notify_config_changed`, which is then called by the `ap_scan_bus` function. So, we have this nested chain, from the low-level change detection, all the way up to where the bus is scanned. Now, `ap_scan_bus` can be triggered either by a timer firing or by `ap_bus_force_rescan`. That last piece is what has me thinking: is there a sysfs attribute, a way to manually force the driver to rescan the bus? If so, that's incredibly useful for debugging and control. It's the equivalent of a software reset and could shed light on some other issues. I need to look for that and see if it is available. |
| 40/2 | 2026/08/07 23:18 | tool | grepper |
0mArgs:{
"Expression": "ap_bus_force_rescan",
"PathPrefix": "drivers/s390/crypto/"
}Results: {
"Output": "drivers/s390/crypto/ap_bus.c=1112=EXPORT_SYMBOL(ap_driver_unregister);\n--\ndrivers/s390/crypto/ap_bus.c-1118- */\ndrivers/s390/crypto/ap_bus.c:1119:bool ap_bus_force_rescan(void)\ndrivers/s390/crypto/ap_bus.c-1120-{\n--\ndrivers/s390/crypto/ap_bus.c-1133-\t * all cards are offline so a rescan is triggered which causes\ndrivers/s390/crypto/ap_bus.c:1134:\t * a recursive call of ap_bus_force_rescan(). A simple return if\ndrivers/s390/crypto/ap_bus.c-1135-\t * the mutex is already locked by this thread solves this.\n--\ndrivers/s390/crypto/ap_bus.c-1169-}\ndrivers/s390/crypto/ap_bus.c:1170:EXPORT_SYMBOL(ap_bus_force_rescan);\ndrivers/s390/crypto/ap_bus.c-1171-\n--\ndrivers/s390/crypto/ap_bus.c=1175=static int ap_bus_cfg_chg(struct notifier_block *nb,\n--\ndrivers/s390/crypto/ap_bus.c-1182-\ndrivers/s390/crypto/ap_bus.c:1183:\tap_bus_force_rescan();\ndrivers/s390/crypto/ap_bus.c-1184-\n--\ndrivers/s390/crypto/ap_bus.c=1710=static ssize_t scans_store(const struct bus_type *bus, const char *buf,\n--\ndrivers/s390/crypto/ap_bus.c-1714-\ndrivers/s390/crypto/ap_bus.c:1715:\tap_bus_force_rescan();\ndrivers/s390/crypto/ap_bus.c-1716-\n--\ndrivers/s390/crypto/ap_bus.h=256=void ap_request_timeout(struct timer_list *t);\ndrivers/s390/crypto/ap_bus.h:257:bool ap_bus_force_rescan(void);\ndrivers/s390/crypto/ap_bus.h-258-\n--\ndrivers/s390/crypto/zcrypt_api.c=80=static inline bool zcrypt_process_rescan(void)\ndrivers/s390/crypto/zcrypt_api.c-81-{\ndrivers/s390/crypto/zcrypt_api.c:82:\treturn ap_bus_force_rescan();\ndrivers/s390/crypto/zcrypt_api.c-83-}\n"
} |
| 41/2 | 2026/08/07 23:18 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 26895 output: 33 thoughts: 341 Thoughts: **My Analysis of the AP Bus Rescan Logic** Okay, so here's how this all works. `scans_store` ultimately calls `ap_bus_force_rescan`. A user can trigger this via the `/sys/bus/ap/scans` interface. That's straightforward. However, `ap_scan_bus` then *only* calls `notify_config_changed` if `ap_get_configuration` returns true. That's the crux of it. And `ap_get_configuration` only returns true if `ap_qci_info` has changed since the last call. `ap_qci_info` is, in turn, populated by `ap_qci`, which executes the `PQAP(QCI)` instruction. So, here's what it comes down to: unless `PQAP(QCI)` results in a changed `ap_qci_info`, `notify_config_changed` *won't* be triggered, no matter how many times we write to `/sys/bus/ap/scans`. This seems to suggest the hypervisor (QEMU, in this case) has to change the underlying configuration. If QEMU doesn't change anything, this whole code path appears to be inert. The question then becomes: can a user-space process *within the guest* actually modify this AP configuration in a way that would trigger this? Realistically, no. The AP configuration is provided by the hypervisor. Unless someone has found some crazy hack, or there's a specific mechanism I'm missing to mock or inject changes from *within* the guest, this seems to be triggered only by hypervisor-level changes, like hotplugging. But wait, what about the case where the guest is running on QEMU, but QEMU doesn't support AP cards at all, or has none configured? In that scenario, `ap_qci_info->flags` will likely be zero, indicating QCI isn't supported, and `ap_get_configuration` will consistently return false. This makes sense. Alright, is there any kind of software emulation of AP cards within the kernel that could potentially intervene here? I need to check if any test or mock drivers exist for the AP bus. I need to make sure I haven't missed a side path that's emulating AP changes without hypervisor input. |
| 42/2 | 2026/08/07 23:18 | tool | grepper |
0mArgs:{
"Expression": "ap_qci",
"PathPrefix": "drivers/s390/crypto/"
}Results: {
"Output": "drivers/s390/crypto/ap_bus.c=107=static struct ap_config_info qci[2];\ndrivers/s390/crypto/ap_bus.c:108:static struct ap_config_info *const ap_qci_info = \u0026qci[0];\ndrivers/s390/crypto/ap_bus.c:109:static struct ap_config_info *const ap_qci_info_old = \u0026qci[1];\ndrivers/s390/crypto/ap_bus.c-110-\n--\ndrivers/s390/crypto/ap_bus.c=209=static int ap_interrupts_available(void)\n--\ndrivers/s390/crypto/ap_bus.c-214-/**\ndrivers/s390/crypto/ap_bus.c:215: * ap_qci_available(): Test if AP configuration\ndrivers/s390/crypto/ap_bus.c-216- * information can be queried via QCI subfunction.\n--\ndrivers/s390/crypto/ap_bus.c-219- */\ndrivers/s390/crypto/ap_bus.c:220:static int ap_qci_available(void)\ndrivers/s390/crypto/ap_bus.c-221-{\n--\ndrivers/s390/crypto/ap_bus.c=241=static inline int ap_qact_available(void)\ndrivers/s390/crypto/ap_bus.c-242-{\ndrivers/s390/crypto/ap_bus.c:243:\treturn ap_qci_info-\u003eqact;\ndrivers/s390/crypto/ap_bus.c-244-}\n--\ndrivers/s390/crypto/ap_bus.c=251=int ap_sb_available(void)\ndrivers/s390/crypto/ap_bus.c-252-{\ndrivers/s390/crypto/ap_bus.c:253:\treturn ap_qci_info-\u003eapsb;\ndrivers/s390/crypto/ap_bus.c-254-}\n--\ndrivers/s390/crypto/ap_bus.c=270=static void __init ap_init_qci_info(void)\ndrivers/s390/crypto/ap_bus.c-271-{\ndrivers/s390/crypto/ap_bus.c:272:\tif (!ap_qci_available() ||\ndrivers/s390/crypto/ap_bus.c:273:\t ap_qci(ap_qci_info)) {\ndrivers/s390/crypto/ap_bus.c-274-\t\tAP_DBF_INFO(\"%s QCI not supported\\n\", __func__);\n--\ndrivers/s390/crypto/ap_bus.c-276-\t}\ndrivers/s390/crypto/ap_bus.c:277:\tmemcpy(ap_qci_info_old, ap_qci_info, sizeof(*ap_qci_info));\ndrivers/s390/crypto/ap_bus.c-278-\tAP_DBF_INFO(\"%s successful fetched initial qci info\\n\", __func__);\ndrivers/s390/crypto/ap_bus.c-279-\ndrivers/s390/crypto/ap_bus.c:280:\tif (ap_qci_info-\u003eapxa) {\ndrivers/s390/crypto/ap_bus.c:281:\t\tif (ap_qci_info-\u003ena) {\ndrivers/s390/crypto/ap_bus.c:282:\t\t\tap_max_adapter_id = ap_qci_info-\u003ena;\ndrivers/s390/crypto/ap_bus.c-283-\t\t\tAP_DBF_INFO(\"%s new ap_max_adapter_id is %d\\n\",\n--\ndrivers/s390/crypto/ap_bus.c-285-\t\t}\ndrivers/s390/crypto/ap_bus.c:286:\t\tif (ap_qci_info-\u003end) {\ndrivers/s390/crypto/ap_bus.c:287:\t\t\tap_max_domain_id = ap_qci_info-\u003end;\ndrivers/s390/crypto/ap_bus.c-288-\t\t\tAP_DBF_INFO(\"%s new ap_max_domain_id is %d\\n\",\n--\ndrivers/s390/crypto/ap_bus.c=310=static inline int ap_test_config_card_id(unsigned int id)\n--\ndrivers/s390/crypto/ap_bus.c-313-\t\treturn 0;\ndrivers/s390/crypto/ap_bus.c:314:\tif (ap_qci_info-\u003eflags)\ndrivers/s390/crypto/ap_bus.c:315:\t\treturn ap_test_config(ap_qci_info-\u003eapm, id);\ndrivers/s390/crypto/ap_bus.c-316-\treturn 1;\n--\ndrivers/s390/crypto/ap_bus.c=327=int ap_test_config_usage_domain(unsigned int domain)\n--\ndrivers/s390/crypto/ap_bus.c-330-\t\treturn 0;\ndrivers/s390/crypto/ap_bus.c:331:\tif (ap_qci_info-\u003eflags)\ndrivers/s390/crypto/ap_bus.c:332:\t\treturn ap_test_config(ap_qci_info-\u003eaqm, domain);\ndrivers/s390/crypto/ap_bus.c-333-\treturn 1;\n--\ndrivers/s390/crypto/ap_bus.c=345=int ap_test_config_ctrl_domain(unsigned int domain)\ndrivers/s390/crypto/ap_bus.c-346-{\ndrivers/s390/crypto/ap_bus.c:347:\tif (!ap_qci_info || domain \u003e ap_max_domain_id)\ndrivers/s390/crypto/ap_bus.c-348-\t\treturn 0;\ndrivers/s390/crypto/ap_bus.c:349:\treturn ap_test_config(ap_qci_info-\u003eadm, domain);\ndrivers/s390/crypto/ap_bus.c-350-}\n--\ndrivers/s390/crypto/ap_bus.c=1349=static ssize_t ap_control_domain_mask_show(const struct bus_type *bus, char *buf)\ndrivers/s390/crypto/ap_bus.c-1350-{\ndrivers/s390/crypto/ap_bus.c:1351:\tif (!ap_qci_info-\u003eflags)\t/* QCI not supported */\ndrivers/s390/crypto/ap_bus.c-1352-\t\treturn sysfs_emit(buf, \"not supported\\n\");\n--\ndrivers/s390/crypto/ap_bus.c-1354-\treturn sysfs_emit(buf, \"0x%08x%08x%08x%08x%08x%08x%08x%08x\\n\",\ndrivers/s390/crypto/ap_bus.c:1355:\t\t\t ap_qci_info-\u003eadm[0], ap_qci_info-\u003eadm[1],\ndrivers/s390/crypto/ap_bus.c:1356:\t\t\t ap_qci_info-\u003eadm[2], ap_qci_info-\u003eadm[3],\ndrivers/s390/crypto/ap_bus.c:1357:\t\t\t ap_qci_info-\u003eadm[4], ap_qci_info-\u003eadm[5],\ndrivers/s390/crypto/ap_bus.c:1358:\t\t\t ap_qci_info-\u003eadm[6], ap_qci_info-\u003eadm[7]);\ndrivers/s390/crypto/ap_bus.c-1359-}\n--\ndrivers/s390/crypto/ap_bus.c=1363=static ssize_t ap_usage_domain_mask_show(const struct bus_type *bus, char *buf)\ndrivers/s390/crypto/ap_bus.c-1364-{\ndrivers/s390/crypto/ap_bus.c:1365:\tif (!ap_qci_info-\u003eflags)\t/* QCI not supported */\ndrivers/s390/crypto/ap_bus.c-1366-\t\treturn sysfs_emit(buf, \"not supported\\n\");\n--\ndrivers/s390/crypto/ap_bus.c-1368-\treturn sysfs_emit(buf, \"0x%08x%08x%08x%08x%08x%08x%08x%08x\\n\",\ndrivers/s390/crypto/ap_bus.c:1369:\t\t\t ap_qci_info-\u003eaqm[0], ap_qci_info-\u003eaqm[1],\ndrivers/s390/crypto/ap_bus.c:1370:\t\t\t ap_qci_info-\u003eaqm[2], ap_qci_info-\u003eaqm[3],\ndrivers/s390/crypto/ap_bus.c:1371:\t\t\t ap_qci_info-\u003eaqm[4], ap_qci_info-\u003eaqm[5],\ndrivers/s390/crypto/ap_bus.c:1372:\t\t\t ap_qci_info-\u003eaqm[6], ap_qci_info-\u003eaqm[7]);\ndrivers/s390/crypto/ap_bus.c-1373-}\n--\ndrivers/s390/crypto/ap_bus.c=1377=static ssize_t ap_adapter_mask_show(const struct bus_type *bus, char *buf)\ndrivers/s390/crypto/ap_bus.c-1378-{\ndrivers/s390/crypto/ap_bus.c:1379:\tif (!ap_qci_info-\u003eflags)\t/* QCI not supported */\ndrivers/s390/crypto/ap_bus.c-1380-\t\treturn sysfs_emit(buf, \"not supported\\n\");\n--\ndrivers/s390/crypto/ap_bus.c-1382-\treturn sysfs_emit(buf, \"0x%08x%08x%08x%08x%08x%08x%08x%08x\\n\",\ndrivers/s390/crypto/ap_bus.c:1383:\t\t\t ap_qci_info-\u003eapm[0], ap_qci_info-\u003eapm[1],\ndrivers/s390/crypto/ap_bus.c:1384:\t\t\t ap_qci_info-\u003eapm[2], ap_qci_info-\u003eapm[3],\ndrivers/s390/crypto/ap_bus.c:1385:\t\t\t ap_qci_info-\u003eapm[4], ap_qci_info-\u003eapm[5],\ndrivers/s390/crypto/ap_bus.c:1386:\t\t\t ap_qci_info-\u003eapm[6], ap_qci_info-\u003eapm[7]);\ndrivers/s390/crypto/ap_bus.c-1387-}\n--\ndrivers/s390/crypto/ap_bus.c=1747=static ssize_t features_show(const struct bus_type *bus, char *buf)\n--\ndrivers/s390/crypto/ap_bus.c-1750-\ndrivers/s390/crypto/ap_bus.c:1751:\tif (!ap_qci_info-\u003eflags)\t/* QCI not supported */\ndrivers/s390/crypto/ap_bus.c-1752-\t\treturn sysfs_emit(buf, \"-\\n\");\ndrivers/s390/crypto/ap_bus.c-1753-\ndrivers/s390/crypto/ap_bus.c:1754:\tif (ap_qci_info-\u003eapsc)\ndrivers/s390/crypto/ap_bus.c-1755-\t\tn += sysfs_emit_at(buf, n, \"APSC \");\ndrivers/s390/crypto/ap_bus.c:1756:\tif (ap_qci_info-\u003eapxa)\ndrivers/s390/crypto/ap_bus.c-1757-\t\tn += sysfs_emit_at(buf, n, \"APXA \");\ndrivers/s390/crypto/ap_bus.c:1758:\tif (ap_qci_info-\u003eqact)\ndrivers/s390/crypto/ap_bus.c-1759-\t\tn += sysfs_emit_at(buf, n, \"QACT \");\ndrivers/s390/crypto/ap_bus.c:1760:\tif (ap_qci_info-\u003erc8a)\ndrivers/s390/crypto/ap_bus.c-1761-\t\tn += sysfs_emit_at(buf, n, \"RC8A \");\ndrivers/s390/crypto/ap_bus.c:1762:\tif (ap_qci_info-\u003eapsb)\ndrivers/s390/crypto/ap_bus.c-1763-\t\tn += sysfs_emit_at(buf, n, \"APSB \");\n--\ndrivers/s390/crypto/ap_bus.c=1923=static int __drv_notify_config_changed(struct device_driver *drv, void *data)\n--\ndrivers/s390/crypto/ap_bus.c-1928-\t\tif (ap_drv-\u003eon_config_changed)\ndrivers/s390/crypto/ap_bus.c:1929:\t\t\tap_drv-\u003eon_config_changed(ap_qci_info, ap_qci_info_old);\ndrivers/s390/crypto/ap_bus.c-1930-\t\tmodule_put(drv-\u003eowner);\n--\ndrivers/s390/crypto/ap_bus.c=1944=static int __drv_notify_scan_complete(struct device_driver *drv, void *data)\n--\ndrivers/s390/crypto/ap_bus.c-1949-\t\tif (ap_drv-\u003eon_scan_complete)\ndrivers/s390/crypto/ap_bus.c:1950:\t\t\tap_drv-\u003eon_scan_complete(ap_qci_info,\ndrivers/s390/crypto/ap_bus.c:1951:\t\t\t\t\t\t ap_qci_info_old);\ndrivers/s390/crypto/ap_bus.c-1952-\t\tmodule_put(drv-\u003eowner);\n--\ndrivers/s390/crypto/ap_bus.c=2311=static bool ap_get_configuration(void)\ndrivers/s390/crypto/ap_bus.c-2312-{\ndrivers/s390/crypto/ap_bus.c:2313:\tif (!ap_qci_info-\u003eflags)\t/* QCI not supported */\ndrivers/s390/crypto/ap_bus.c-2314-\t\treturn false;\ndrivers/s390/crypto/ap_bus.c-2315-\ndrivers/s390/crypto/ap_bus.c:2316:\tmemcpy(ap_qci_info_old, ap_qci_info, sizeof(*ap_qci_info));\ndrivers/s390/crypto/ap_bus.c:2317:\tap_qci(ap_qci_info);\ndrivers/s390/crypto/ap_bus.c-2318-\ndrivers/s390/crypto/ap_bus.c:2319:\treturn memcmp(ap_qci_info, ap_qci_info_old,\ndrivers/s390/crypto/ap_bus.c-2320-\t\t sizeof(struct ap_config_info)) != 0;\n--\ndrivers/s390/crypto/ap_bus.c=2329=static bool ap_config_has_new_aps(void)\n--\ndrivers/s390/crypto/ap_bus.c-2333-\ndrivers/s390/crypto/ap_bus.c:2334:\tif (!ap_qci_info-\u003eflags)\ndrivers/s390/crypto/ap_bus.c-2335-\t\treturn false;\ndrivers/s390/crypto/ap_bus.c-2336-\ndrivers/s390/crypto/ap_bus.c:2337:\tbitmap_andnot(m, (unsigned long *)ap_qci_info-\u003eapm,\ndrivers/s390/crypto/ap_bus.c:2338:\t\t (unsigned long *)ap_qci_info_old-\u003eapm, AP_DEVICES);\ndrivers/s390/crypto/ap_bus.c-2339-\tif (!bitmap_empty(m, AP_DEVICES))\n--\ndrivers/s390/crypto/ap_bus.c=2351=static bool ap_config_has_new_doms(void)\n--\ndrivers/s390/crypto/ap_bus.c-2354-\ndrivers/s390/crypto/ap_bus.c:2355:\tif (!ap_qci_info-\u003eflags)\ndrivers/s390/crypto/ap_bus.c-2356-\t\treturn false;\ndrivers/s390/crypto/ap_bus.c-2357-\ndrivers/s390/crypto/ap_bus.c:2358:\tbitmap_andnot(m, (unsigned long *)ap_qci_info-\u003eaqm,\ndrivers/s390/crypto/ap_bus.c:2359:\t\t (unsigned long *)ap_qci_info_old-\u003eaqm, AP_DOMAINS);\ndrivers/s390/crypto/ap_bus.c-2360-\tif (!bitmap_empty(m, AP_DOMAINS))\n--\ndrivers/s390/crypto/vfio_ap_drv.c=86=static int vfio_ap_matrix_dev_create(void)\n--\ndrivers/s390/crypto/vfio_ap_drv.c-106-\tif (test_facility(12)) {\ndrivers/s390/crypto/vfio_ap_drv.c:107:\t\tret = ap_qci(\u0026matrix_dev-\u003einfo);\ndrivers/s390/crypto/vfio_ap_drv.c-108-\t\tif (ret)\n"
} |
| 43/2 | 2026/08/07 23:18 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 32531 output: 46 thoughts: 302 Thoughts: **Analyzing the `vfio_ap_mdev_cfg_remove` Callback** Okay, so there's no "mock driver" involved here, the `ap_qci` instruction is executed directly. My initial thought is that if the hypervisor doesn't support it or if the configuration remains unchanged, the related code path won't be triggered. The critical question becomes, can syzkaller even run on an s390x VM with AP cards properly configured? I know syzkaller has s390x support, but what about AP cards specifically? Let's re-examine the original prompt... it mentions unreachable code paths in virtualized environments like GCE or QEMU, even with emulated hardware. It also specifically highlights ".remove, .shutdown, or pci_unregister_driver teardown callbacks". This is a clue. Ah, `vfio_ap_mdev_cfg_remove`. This is triggered during hot-unplug events – particularly when AP configuration changes, say, when adapters or domains are removed. Thinking it through... `vfio_ap_mdev_cfg_remove` is called from `vfio_ap_mdev_on_cfg_remove`, which is called when the AP configuration changes. Does this callback count as a teardown function? Yes, it's explicitly for hot-unplug scenarios, which confirms the relevance to the stated context. Now, let's just make sure, a quick check of the comment for `vfio_ap_mdev_cfg_remove` is in order to be completely certain. |
| 44/2 | 2026/08/07 23:18 | tool | read-file |
0mArgs:{
"File": "drivers/s390/crypto/vfio_ap_ops.c",
"FirstLine": 2585,
"LineCount": 20
}Results: {
"Contents": "2585:\t/**\n2586:\t * vfio_ap_mdev_cfg_remove - determines which guests are using the adapters,\n2587:\t *\t\t\t domains and control domains that have been removed\n2588:\t *\t\t\t from the host AP configuration and unplugs them\n2589:\t *\t\t\t from those guests.\n2590:\t *\n2591:\t * @ap_remove:\tbitmap specifying which adapters have been removed from the host\n2592:\t *\t\tconfig.\n2593:\t * @aq_remove:\tbitmap specifying which domains have been removed from the host\n2594:\t *\t\tconfig.\n2595:\t * @cd_remove:\tbitmap specifying which control domains have been removed from\n2596:\t *\t\tthe host config.\n2597:\t */\n2598:\tstatic void vfio_ap_mdev_cfg_remove(unsigned long *ap_remove,\n2599:\t\t\t\t\t unsigned long *aq_remove,\n2600:\t\t\t\t\t unsigned long *cd_remove)\n2601:\t{\n2602:\t\tstruct ap_matrix_mdev *matrix_mdev;\n2603:\t\tDECLARE_BITMAP(aprem, AP_DEVICES);\n2604:\t\tDECLARE_BITMAP(aqrem, AP_DOMAINS);\n"
} |
| 45/2 | 2026/08/07 23:18 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 33564 output: 104 thoughts: 649 Thoughts: **WorthFuzzing Decision: No** Okay, here's the breakdown of my thinking. The code in question clearly targets hot-unplug scenarios, specifically regarding AP configuration changes. The prompt specifically instructs me to set `WorthFuzzing=false` if the patch involves driver teardown callbacks like `.remove` or `.shutdown` that are *only* executed during PCI hot-unplug or sysfs driver unbind operations. This patch falls squarely into that category, dealing with the removal of guests using certain adapters, domains, and control domains after the host AP configuration is changed. Just to be thorough, I traced the call chain. `vfio_ap_mdev_cfg_remove` is triggered through `vfio_ap_mdev_on_cfg_remove`, which in turn is called by `vfio_ap_on_cfg_changed`. This function is initiated by `__drv_notify_config_changed`, which is directly linked to AP bus configuration changes, i.e., hotplug/hotunplug events. There's no way around it; this is a pure hot-unplug event handler. My reading of the instructions is clear, so this is not worth fuzzing. I quickly reviewed the patch itself, and it modifies the function `vfio_ap_mdev_cfg_remove`, specifically changing a `bitmap_andnot` operation to `bitmap_and`. That's a bug fix within this hot-unplug path. The fact that it relates to s390 AP crypto, and that it requires hypervisor configuration changes to even be triggered, further reinforces the "hot-unplug" exception. Therefore, I'm confident in setting `WorthFuzzing=false`. |
| 46/2 | 2026/08/07 23:18 | tool | set-results |
0mArgs:{
"EnableConfigs": [],
"FocusSymbols": [],
"Reasoning": "The patch modifies a hot-unplug callback (`vfio_ap_mdev_cfg_remove`) in the s390 VFIO AP crypto driver, which is executed only when AP adapters or domains are removed from the host AP configuration. According to the instructions, teardown callbacks executed only during hot-unplug operations are not worth fuzzing.",
"WorthFuzzing": false
}Results: {
"EnableConfigs": null,
"FocusSymbols": [],
"Reasoning": "The patch modifies a hot-unplug callback (`vfio_ap_mdev_cfg_remove`) in the s390 VFIO AP crypto driver, which is executed only when AP adapters or domains are removed from the host AP configuration. According to the instructions, teardown callbacks executed only during hot-unplug operations are not worth fuzzing.",
"WorthFuzzing": false
} |
| 47/1 | 2026/08/07 23:18 | action | If |
0mArgs:{
"WorthFuzzing": false
}Results: null |
| Total Calls | Total Tokens | Avg Tokens | Total Duration (Seconds) | Avg Duration (Seconds) |
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| Total Calls | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|