Create one vGPU and then unbind IGD device from i915 driver. The following
oops will happen. This patch will free vgpu resource first and then gvt
resource to remove these oops.
BUG: unable to handle kernel NULL pointer dereference at
00000000000000a8
PGD
80000003c9d2c067 P4D
80000003c9d2c067 PUD
3c817c067 P MD 0
Oops: 0002 [#1] SMP PTI
RIP: 0010:down_write+0x1b/0x40
Call Trace:
debugfs_remove_recursive+0x46/0x1a0
intel_gvt_debugfs_remove_vgpu+0x15/0x30 [i915]
intel_gvt_destroy_vgpu+0x2d/0xf0 [i915]
intel_vgpu_remove+0x2c/0x30 [kvmgt]
mdev_device_remove_ops+0x23/0x50 [mdev]
mdev_device_remove+0xdb/0x190 [mdev]
mdev_device_remove+0x190/0x190 [mdev]
device_for_each_child+0x47/0x90
mdev_unregister_device+0xd5/0x120 [mdev]
intel_gvt_clean_device+0x91/0x120 [i915]
i915_driver_unload+0x9d/0x120 [i915]
i915_pci_remove+0x15/0x20 [i915]
pci_device_remove+0x3b/0xc0
device_release_driver_internal+0x157/0x230
unbind_store+0xfc/0x150
kernfs_fop_write+0x10f/0x180
__vfs_write+0x36/0x180
? common_file_perm+0x41/0x130
? _cond_resched+0x16/0x40
vfs_write+0xb3/0x1a0
ksys_write+0x52/0xc0
do_syscall_64+0x55/0x100
entry_SYSCALL_64_after_hwframe+0x44/0xa9
BUG: unable to handle kernel NULL pointer dereference at 0
000000000000038
PGD
8000000405bce067 P4D
8000000405bce067 PUD
405bcd067 PM D 0
Oops: 0000 [#1] SMP PTI
RIP: 0010:hrtimer_active+0x5/0x40
Call Trace:
hrtimer_try_to_cancel+0x25/0x120
? tbs_sched_clean_vgpu+0x1f/0x50 [i915]
hrtimer_cancel+0x15/0x20
intel_gvt_destroy_vgpu+0x4c/0xf0 [i915]
intel_vgpu_remove+0x2c/0x30 [kvmgt]
mdev_device_remove_ops+0x23/0x50 [mdev]
mdev_device_remove+0xdb/0x190 [mdev]
? mdev_device_remove+0x190/0x190 [mdev]
device_for_each_child+0x47/0x90
mdev_unregister_device+0xd5/0x120 [mdev]
intel_gvt_clean_device+0x89/0x120 [i915]
i915_driver_unload+0x9d/0x120 [i915]
i915_pci_remove+0x15/0x20 [i915]
pci_device_remove+0x3b/0xc0
device_release_driver_internal+0x157/0x230
unbind_store+0xfc/0x150
kernfs_fop_write+0x10f/0x180
__vfs_write+0x36/0x180
? common_file_perm+0x41/0x130
? _cond_resched+0x16/0x40
vfs_write+0xb3/0x1a0
ksys_write+0x52/0xc0
do_syscall_64+0x55/0x100
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Fixes: bc7b0be316ae("drm/i915/gvt: Add basic debugfs infrastructure")
Fixes: afe04fbe6c52("drm/i915/gvt: create an idle vGPU")
Signed-off-by: Hang Yuan <hang.yuan@linux.intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
if (WARN_ON(!gvt))
return;
+ intel_gvt_destroy_idle_vgpu(gvt->idle_vgpu);
+ intel_gvt_hypervisor_host_exit(&dev_priv->drm.pdev->dev, gvt);
+ intel_gvt_cleanup_vgpu_type_groups(gvt);
+ intel_gvt_clean_vgpu_types(gvt);
+
intel_gvt_debugfs_clean(gvt);
clean_service_thread(gvt);
intel_gvt_clean_cmd_parser(gvt);
intel_gvt_clean_workload_scheduler(gvt);
intel_gvt_clean_gtt(gvt);
intel_gvt_clean_irq(gvt);
- intel_gvt_clean_mmio_info(gvt);
intel_gvt_free_firmware(gvt);
-
- intel_gvt_hypervisor_host_exit(&dev_priv->drm.pdev->dev, gvt);
- intel_gvt_cleanup_vgpu_type_groups(gvt);
- intel_gvt_clean_vgpu_types(gvt);
-
+ intel_gvt_clean_mmio_info(gvt);
idr_destroy(&gvt->vgpu_idr);
- intel_gvt_destroy_idle_vgpu(gvt->idle_vgpu);
-
kfree(dev_priv->gvt);
dev_priv->gvt = NULL;
}