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| author | Pavel Fedin <p.fedin@samsung.com> | 2015-09-25 17:00:29 +0300 |
|---|---|---|
| committer | Christoffer Dall <christoffer.dall@linaro.org> | 2015-10-20 19:04:43 +0300 |
| commit | 437f9963bc4fd75889c1fe9289a92dea9124a439 (patch) | |
| tree | b91113c13849796b8cee1b57094f2d0f99eb3857 /virt | |
| parent | 920552b213e3dc832a874b4e7ba29ecddbab31bc (diff) | |
| download | linux-437f9963bc4fd75889c1fe9289a92dea9124a439.tar.xz | |
KVM: arm/arm64: Do not inject spurious interrupts
When lowering a level-triggered line from userspace, we forgot to lower
the pending bit on the emulated CPU interface and we also did not
re-compute the pending_on_cpu bitmap for the CPU affected by the change.
Update vgic_update_irq_pending() to fix the two issues above and also
raise a warning in vgic_quue_irq_to_lr if we encounter an interrupt
pending on a CPU which is neither marked active nor pending.
[ Commit text reworked completely - Christoffer ]
Signed-off-by: Pavel Fedin <p.fedin@samsung.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/arm/vgic.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c index 6bd1c9bf7ae7..596455a394af 100644 --- a/virt/kvm/arm/vgic.c +++ b/virt/kvm/arm/vgic.c @@ -1132,7 +1132,8 @@ static void vgic_queue_irq_to_lr(struct kvm_vcpu *vcpu, int irq, kvm_debug("Set active, clear distributor: 0x%x\n", vlr.state); vgic_irq_clear_active(vcpu, irq); vgic_update_state(vcpu->kvm); - } else if (vgic_dist_irq_is_pending(vcpu, irq)) { + } else { + WARN_ON(!vgic_dist_irq_is_pending(vcpu, irq)); vlr.state |= LR_STATE_PENDING; kvm_debug("Set pending: 0x%x\n", vlr.state); } @@ -1607,8 +1608,12 @@ static int vgic_update_irq_pending(struct kvm *kvm, int cpuid, } else { if (level_triggered) { vgic_dist_irq_clear_level(vcpu, irq_num); - if (!vgic_dist_irq_soft_pend(vcpu, irq_num)) + if (!vgic_dist_irq_soft_pend(vcpu, irq_num)) { vgic_dist_irq_clear_pending(vcpu, irq_num); + vgic_cpu_irq_clear(vcpu, irq_num); + if (!compute_pending_for_cpu(vcpu)) + clear_bit(cpuid, dist->irq_pending_on_cpu); + } } ret = false; |