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KVM: arm64: GICv3: 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.

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/20251120172540.2267180-12-maz@kernel.org
Signed-off-by: Oliver Upton <oupton@kernel.org>
This commit is contained in:
Marc Zyngier
2025-11-20 17:25:01 +00:00
committed by Oliver Upton
parent 73c9726975
commit f4ded7b084
1 changed files with 6 additions and 0 deletions
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6
arch/arm64/kvm/hyp/vgic-v3-sr.c
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@@ -225,6 +225,12 @@ void __vgic_v3_save_state(struct vgic_v3_cpu_if *cpu_if)
elrsr = read_gicreg(ICH_ELRSR_EL2);
if (cpu_if->vgic_hcr & ICH_HCR_EL2_LRENPIE) {
u64 val = read_gicreg(ICH_HCR_EL2);
cpu_if->vgic_hcr &= ~ICH_HCR_EL2_EOIcount;
cpu_if->vgic_hcr |= val & ICH_HCR_EL2_EOIcount;
}
write_gicreg(0, ICH_HCR_EL2);
for (i = 0; i < used_lrs; i++) {