Jiaqing Zhao 626e2f1d17 hv: vpci: clear vdev structure on device deassign ...

In devicemodel, a passthrough device is deassigned and then assigned to
guest on guest reboot. Each time hypervisor allocates a new pci_vdev
structure to keep its info. As it was stored in a statically-allocated
array, it will eventually use up all slots, resulting both resource
leak and out-of-bounds access.

Fix it by clearing the corresponding vdev structure on device deassign,
thus a bitmap is introduced to track the usage, replacing the existing
array count.

Tracked-On: #8590
Signed-off-by: Jiaqing Zhao <jiaqing.zhao@linux.intel.com>
Reviewed-by: Junjie Mao <junjie.mao@intel.com>

2024-06-04 09:38:34 +08:00

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