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authorEric Auger <eric.auger@linaro.org>2015-03-04 11:14:35 +0100
committerChristoffer Dall <christoffer.dall@linaro.org>2015-03-12 15:15:33 +0100
commit649cf73994e8ac69dfe3e7a35fba9acf051e7fe6 (patch)
treeb77d15b99f731e35ac0a5a8682cadf9e07db8a61 /virt
parentc1426e4c5add09042840013dfa5565e6be6d412e (diff)
downloadlinux-linaro-stable-649cf73994e8ac69dfe3e7a35fba9acf051e7fe6.tar.gz
KVM: arm/arm64: remove coarse grain dist locking at kvm_vgic_sync_hwstate
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>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/arm/vgic.c13
1 files changed, 5 insertions, 8 deletions
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 86cec7924611..897c849305db 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1081,6 +1081,7 @@ epilog:
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)