KVM: arm64: vgic-v4: Restore pending state on host userspace write

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When the VMM writes to ISPENDR0 to set the state pending state of
an SGI, we fail to convey this to the HW if this SGI is already
backed by a GICv4.1 vSGI.

This is a bit of a corner case, as this would only occur if the
vgic state is changed on an already running VM, but this can
apparently happen across a guest reset driven by the VMM.

Fix this by always writing out the pending_latch value to the
HW, and reseting it to false.

Reported-by: Kunkun Jiang <jiangkunkun@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Cc: stable@vger.kernel.org # 5.10+
Link: https://lore.kernel.org/r/7e7f2c0c-448b-10a9-8929-4b8f4f6e2a32@huawei.com

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This commit is contained in:

Marc Zyngier 2023-12-17 11:15:09 +00:00

parent 2cc14f52ae

commit 7b95382f96

1 changed files with 17 additions and 10 deletions

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arch/arm64/kvm/vgic/vgic-mmio-v3.c

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