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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
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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27
arch/arm64/kvm/vgic/vgic-mmio-v3.c
View File

@ -365,19 +365,26 @@ static int vgic_v3_uaccess_write_pending(struct kvm_vcpu *vcpu,
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
raw_spin_lock_irqsave(&irq->irq_lock, flags);
if (test_bit(i, &val)) {
/*
* pending_latch is set irrespective of irq type
* (level or edge) to avoid dependency that VM should
* restore irq config before pending info.
*/
irq->pending_latch = true;
vgic_queue_irq_unlock(vcpu->kvm, irq, flags);
} else {
/*
* pending_latch is set irrespective of irq type
* (level or edge) to avoid dependency that VM should
* restore irq config before pending info.
*/
irq->pending_latch = test_bit(i, &val);
if (irq->hw && vgic_irq_is_sgi(irq->intid)) {
irq_set_irqchip_state(irq->host_irq,
IRQCHIP_STATE_PENDING,
irq->pending_latch);
irq->pending_latch = false;
raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
}
if (irq->pending_latch)
vgic_queue_irq_unlock(vcpu->kvm, irq, flags);
else
raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
vgic_put_irq(vcpu->kvm, irq);
}