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KVM: arm/arm64: vgic: Only set underflow when actually out of LRs 

We currently assume that all the interrupts in our AP list will be
queued to LRs, but that's not necessarily the case, because some of them
could have been migrated away to different VCPUs and only the VCPU
thread itself can remove interrupts from its AP list.

Therefore, slightly change the logic to only setting the underflow
interrupt when we actually run out of LRs.

As it turns out, this allows us to further simplify the handling in
vgic_sync_hwstate in later patches.

Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
This commit is contained in:
Christoffer Dall 2017-03-21 21:16:12 +01:00
parent 00dafa0fcf
commit 90cac1f52a
1 changed files with 6 additions and 4 deletions
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10
virt/kvm/arm/vgic/vgic.c
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@ -601,10 +601,8 @@ static void vgic_flush_lr_state(struct kvm_vcpu *vcpu)
DEBUG_SPINLOCK_BUG_ON(!spin_is_locked(&vgic_cpu->ap_list_lock));
if (compute_ap_list_depth(vcpu) > kvm_vgic_global_state.nr_lr) {
vgic_set_underflow(vcpu);
if (compute_ap_list_depth(vcpu) > kvm_vgic_global_state.nr_lr)
vgic_sort_ap_list(vcpu);
}
list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
spin_lock(&irq->irq_lock);
@ -623,8 +621,12 @@ static void vgic_flush_lr_state(struct kvm_vcpu *vcpu)
next:
spin_unlock(&irq->irq_lock);
if (count == kvm_vgic_global_state.nr_lr)
if (count == kvm_vgic_global_state.nr_lr) {
if (!list_is_last(&irq->ap_list,
&vgic_cpu->ap_list_head))
vgic_set_underflow(vcpu);
break;
}
}
vcpu->arch.vgic_cpu.used_lrs = count;