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KVM: arm64: GICv2: Preserve EOIcount on exit

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EOIcount is how the virtual CPU interface signals that the guest
is deactivating interrupts outside of the LRs when EOImode==0.

We therefore need to preserve that information so that we can find
out what actually needs deactivating, just like we already do on
GICv3.

Tested-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Tested-by: Mark Brown <broonie@kernel.org>
Link: https://msgid.link/20251120172540.2267180-16-maz@kernel.org
Signed-off-by: Oliver Upton <oupton@kernel.org>
This commit is contained in:
Marc Zyngier 2025-11-20 17:25:05 +00:00 committed by Oliver Upton
parent 1ae0448ca7
commit 5ceb3dac80
1 changed files with 6 additions and 0 deletions
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6
arch/arm64/kvm/vgic/vgic-v2.c
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@ -437,6 +437,12 @@ void vgic_v2_save_state(struct kvm_vcpu *vcpu)
return;
if (used_lrs) {
if (vcpu->arch.vgic_cpu.vgic_v2.vgic_hcr & GICH_HCR_LRENPIE) {
u32 val = readl_relaxed(base + GICH_HCR);
vcpu->arch.vgic_cpu.vgic_v2.vgic_hcr &= ~GICH_HCR_EOICOUNT;
vcpu->arch.vgic_cpu.vgic_v2.vgic_hcr |= val & GICH_HCR_EOICOUNT;
}
save_lrs(vcpu, base);
writel_relaxed(0, base + GICH_HCR);
}