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| author | Andrew Jones <drjones@redhat.com> | 2017-06-04 14:44:00 +0200 |
|---|---|---|
| committer | Christoffer Dall <cdall@linaro.org> | 2017-06-04 16:53:56 +0200 |
| commit | b7484931e4a8b06fe734ac2b5134f09204bad11a (patch) | |
| tree | 0606976263fb79133196e43387cc26bd40542fb8 /virt/kvm/arm | |
| parent | 325f9c649c8a4e447e4d3babacc7a60b75012d5d (diff) | |
| download | linux-b7484931e4a8b06fe734ac2b5134f09204bad11a.tar.bz2 | |
KVM: arm/arm64: PMU: remove request-less vcpu kick
Refactor PMU overflow handling in order to remove the request-less
vcpu kick. Now, since kvm_vgic_inject_irq() uses vcpu requests,
there should be no chance that a kick sent at just the wrong time
(between the VCPU's call to kvm_pmu_flush_hwstate() and before it
enters guest mode) results in a failure for the guest to see updated
GIC state until its next exit some time later for some other reason.
Signed-off-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
Diffstat (limited to 'virt/kvm/arm')
| -rw-r--r-- | virt/kvm/arm/pmu.c | 40 |
1 files changed, 19 insertions, 21 deletions
diff --git a/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c index 4b43e7f3b158..2451607dc25e 100644 --- a/virt/kvm/arm/pmu.c +++ b/virt/kvm/arm/pmu.c @@ -203,6 +203,23 @@ static u64 kvm_pmu_overflow_status(struct kvm_vcpu *vcpu) return reg; } +static void kvm_pmu_check_overflow(struct kvm_vcpu *vcpu) +{ + struct kvm_pmu *pmu = &vcpu->arch.pmu; + bool overflow = !!kvm_pmu_overflow_status(vcpu); + + if (pmu->irq_level == overflow) + return; + + pmu->irq_level = overflow; + + if (likely(irqchip_in_kernel(vcpu->kvm))) { + int ret = kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id, + pmu->irq_num, overflow); + WARN_ON(ret); + } +} + /** * kvm_pmu_overflow_set - set PMU overflow interrupt * @vcpu: The vcpu pointer @@ -210,37 +227,18 @@ static u64 kvm_pmu_overflow_status(struct kvm_vcpu *vcpu) */ void kvm_pmu_overflow_set(struct kvm_vcpu *vcpu, u64 val) { - u64 reg; - if (val == 0) return; vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= val; - reg = kvm_pmu_overflow_status(vcpu); - if (reg != 0) - kvm_vcpu_kick(vcpu); + kvm_pmu_check_overflow(vcpu); } static void kvm_pmu_update_state(struct kvm_vcpu *vcpu) { - struct kvm_pmu *pmu = &vcpu->arch.pmu; - bool overflow; - if (!kvm_arm_pmu_v3_ready(vcpu)) return; - - overflow = !!kvm_pmu_overflow_status(vcpu); - if (pmu->irq_level == overflow) - return; - - pmu->irq_level = overflow; - - if (likely(irqchip_in_kernel(vcpu->kvm))) { - int ret; - ret = kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id, - pmu->irq_num, overflow); - WARN_ON(ret); - } + kvm_pmu_check_overflow(vcpu); } bool kvm_pmu_should_notify_user(struct kvm_vcpu *vcpu) |