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KVM: arm/arm64: remove coarse grain dist locking at kvm_vgic_sync_hwstate

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To prepare for irqfd addition, coarse grain locking is removed at
kvm_vgic_sync_hwstate level and finer grain locking is introduced in
vgic_process_maintenance only.

Signed-off-by: Eric Auger <eric.auger@linaro.org>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Eric Auger 2015-03-04 11:14:35 +01:00 committed by Christoffer Dall
parent c1426e4c5a
commit 649cf73994
1 changed files with 5 additions and 8 deletions
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13
virt/kvm/arm/vgic.c
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@ -1081,6 +1081,7 @@ static void __kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu)
static bool vgic_process_maintenance(struct kvm_vcpu *vcpu)
{
u32 status = vgic_get_interrupt_status(vcpu);
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
bool level_pending = false;
kvm_debug("STATUS = %08x\n", status);
@ -1098,6 +1099,7 @@ static bool vgic_process_maintenance(struct kvm_vcpu *vcpu)
struct vgic_lr vlr = vgic_get_lr(vcpu, lr);
WARN_ON(vgic_irq_is_edge(vcpu, vlr.irq));
spin_lock(&dist->lock);
vgic_irq_clear_queued(vcpu, vlr.irq);
WARN_ON(vlr.state & LR_STATE_MASK);
vlr.state = 0;
@ -1125,6 +1127,8 @@ static bool vgic_process_maintenance(struct kvm_vcpu *vcpu)
vgic_cpu_irq_clear(vcpu, vlr.irq);
}
spin_unlock(&dist->lock);
/*
* Despite being EOIed, the LR may not have
* been marked as empty.
@ -1139,10 +1143,7 @@ static bool vgic_process_maintenance(struct kvm_vcpu *vcpu)
return level_pending;
}
/*
* Sync back the VGIC state after a guest run. The distributor lock is
* needed so we don't get preempted in the middle of the state processing.
*/
/* Sync back the VGIC state after a guest run */
static void __kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
@ -1189,14 +1190,10 @@ void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu)
void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
if (!irqchip_in_kernel(vcpu->kvm))
return;
spin_lock(&dist->lock);
__kvm_vgic_sync_hwstate(vcpu);
spin_unlock(&dist->lock);
}
int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu)