drm/virtio: Reset device before deleting virtqueues on freeze

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virtgpu_freeze() waits for the control and cursor queues to drain and
then deletes the virtqueues, but nothing tells the device to stop first.
del_vqs() frees the vring backing, but does not provide a generic device
quiesce operation. In particular, modern virtio-pci keeps enabled queues
active until the device is reset, so the device is left DRIVER_OK with
its queues pointing at memory that has been freed and may be reused while
the guest is suspended. virtio_device_restore() only resets the device
later, on resume.

Reset the device before deleting the virtqueues, the way
virtio_gpu_deinit() already does on removal.

Fixes: cad6a879a7 ("drm/virtio: Freeze and restore hooks to support suspend and resume")
Cc: stable@vger.kernel.org
Signed-off-by: Yuho Choi <oss.patchbox@gmail.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Link: https://patch.msgid.link/20260926202040.1313385-1-oss.patchbox@gmail.com

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Yuho Choi 2026-09-26 16:20:27 -04:00 • committed by Dmitry Osipenko

parent 5e0ed11085

commit 8907eb42c0

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drivers/gpu/drm/virtio/virtgpu_drv.c

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