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KVM: arm/arm64: vgic: Trust the LR state for HW IRQs

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We were probing the physial distributor state for the active state of a
HW virtual IRQ, because we had seen evidence that the LR state was not
cleared when the guest deactivated a virtual interrupted.

However, this issue turned out to be a software bug in the GIC, which
was solved by: 84aab5e68c2a5e1e18d81ae8308c3ce25d501b29
(KVM: arm/arm64: arch_timer: Preserve physical dist. active
state on LR.active, 2015-11-24)

Therefore, get rid of the complexities and just look at the LR.

Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Christoffer Dall 2015-11-24 16:34:31 +01:00
parent 0e3dfda91d
commit 9f958c11b7
1 changed files with 2 additions and 14 deletions
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16
virt/kvm/arm/vgic.c
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@ -1417,25 +1417,13 @@ static bool vgic_process_maintenance(struct kvm_vcpu *vcpu)
static bool vgic_sync_hwirq(struct kvm_vcpu *vcpu, int lr, struct vgic_lr vlr)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
struct irq_phys_map *map;
bool phys_active;
bool level_pending;
int ret;
if (!(vlr.state & LR_HW))
return false;
map = vgic_irq_map_search(vcpu, vlr.irq);
BUG_ON(!map);
ret = irq_get_irqchip_state(map->irq,
IRQCHIP_STATE_ACTIVE,
&phys_active);
WARN_ON(ret);
if (phys_active)
return 0;
if (vlr.state & LR_STATE_ACTIVE)
return false;
spin_lock(&dist->lock);
level_pending = process_queued_irq(vcpu, lr, vlr);