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KVM: arm64: GICv2: Handle LR overflow when EOImode==0

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Similarly to the GICv3 version, handle the EOIcount-driven deactivation
by walking the overflow list.

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/20251120172540.2267180-38-maz@kernel.org
Signed-off-by: Oliver Upton <oupton@kernel.org>
This commit is contained in:
Marc Zyngier
2025-11-20 17:25:27 +00:00
committed by Oliver Upton
parent 78ffc28456
commit 281c6c06e2
1 changed files with 27 additions and 0 deletions
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27
arch/arm64/kvm/vgic/vgic-v2.c
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@@ -100,6 +100,8 @@ static void vgic_v2_fold_lr(struct kvm_vcpu *vcpu, u32 val)
vgic_put_irq(vcpu->kvm, irq);
}
static u32 vgic_v2_compute_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq);
/*
* transfer the content of the LRs back into the corresponding ap_list:
* - active bit is transferred as is
@@ -111,12 +113,37 @@ void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
struct vgic_v2_cpu_if *cpuif = &vgic_cpu->vgic_v2;
u32 eoicount = FIELD_GET(GICH_HCR_EOICOUNT, cpuif->vgic_hcr);
struct vgic_irq *irq;
DEBUG_SPINLOCK_BUG_ON(!irqs_disabled());
for (int lr = 0; lr < vgic_cpu->vgic_v2.used_lrs; lr++)
vgic_v2_fold_lr(vcpu, cpuif->vgic_lr[lr]);
/* See the GICv3 equivalent for the EOIcount handling rationale */
list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
u32 lr;
if (!eoicount) {
break;
} else {
guard(raw_spinlock)(&irq->irq_lock);
if (!(likely(vgic_target_oracle(irq) == vcpu) &&
irq->active))
continue;
lr = vgic_v2_compute_lr(vcpu, irq) & ~GICH_LR_ACTIVE_BIT;
}
if (lr & GICH_LR_HW)
writel_relaxed(FIELD_GET(GICH_LR_PHYSID_CPUID, lr),
kvm_vgic_global_state.gicc_base + GIC_CPU_DEACTIVATE);
vgic_v2_fold_lr(vcpu, lr);
eoicount--;
}
cpuif->used_lrs = 0;
}