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| author | Christoffer Dall <cdall@linaro.org> | 2016-10-16 22:19:11 +0200 |
|---|---|---|
| committer | Christoffer Dall <christoffer.dall@linaro.org> | 2017-11-06 16:23:10 +0100 |
| commit | 006df0f34930e18d0aa52f05705bdfe1fc565943 (patch) | |
| tree | 97d97e06b56113a033ed63ce7ad16096779804f5 /virt/kvm/arm/vgic/vgic-v2.c | |
| parent | f39d16cbabf9f939745a3850a33760910d22ef35 (diff) | |
| download | blackbird-op-linux-006df0f34930e18d0aa52f05705bdfe1fc565943.tar.gz blackbird-op-linux-006df0f34930e18d0aa52f05705bdfe1fc565943.zip | |
KVM: arm/arm64: Support calling vgic_update_irq_pending from irq context
We are about to optimize our timer handling logic which involves
injecting irqs to the vgic directly from the irq handler.
Unfortunately, the injection path can take any AP list lock and irq lock
and we must therefore make sure to use spin_lock_irqsave where ever
interrupts are enabled and we are taking any of those locks, to avoid
deadlocking between process context and the ISR.
This changes a lot of the VGIC code, but the good news are that the
changes are mostly mechanical.
Acked-by: Marc Zyngier <marc,zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
Diffstat (limited to 'virt/kvm/arm/vgic/vgic-v2.c')
| -rw-r--r-- | virt/kvm/arm/vgic/vgic-v2.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/virt/kvm/arm/vgic/vgic-v2.c b/virt/kvm/arm/vgic/vgic-v2.c index e4187e52bb26..80897102da26 100644 --- a/virt/kvm/arm/vgic/vgic-v2.c +++ b/virt/kvm/arm/vgic/vgic-v2.c @@ -62,6 +62,7 @@ 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; int lr; + unsigned long flags; cpuif->vgic_hcr &= ~GICH_HCR_UIE; @@ -77,7 +78,7 @@ void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu) irq = vgic_get_irq(vcpu->kvm, vcpu, intid); - spin_lock(&irq->irq_lock); + spin_lock_irqsave(&irq->irq_lock, flags); /* Always preserve the active bit */ irq->active = !!(val & GICH_LR_ACTIVE_BIT); @@ -104,7 +105,7 @@ void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu) irq->pending_latch = false; } - spin_unlock(&irq->irq_lock); + spin_unlock_irqrestore(&irq->irq_lock, flags); vgic_put_irq(vcpu->kvm, irq); } |
