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KVM: arm/arm64: Fix preemptible timer active state crazyness

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We were setting the physical active state on the GIC distributor in a
preemptible section, which could cause us to set the active state on
different physical CPU from the one we were actually going to run on,
hacoc ensues.

Since we are no longer descheduling/scheduling soft timers in the
flush/sync timer functions, simply moving the timer flush into a
non-preemptible section.

Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Christoffer Dall
2015-11-24 10:31:07 +01:00
parent 498cd5c32b
commit 7e16aa81f9
1 changed files with 1 additions and 6 deletions
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arch/arm/kvm/arm.c
+1 -6
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@@ -563,18 +563,13 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
if (vcpu->arch.power_off || vcpu->arch.pause)
vcpu_sleep(vcpu);
/*
* Disarming the background timer must be done in a
* preemptible context, as this call may sleep.
*/
kvm_timer_flush_hwstate(vcpu);
/*
* Preparing the interrupts to be injected also
* involves poking the GIC, which must be done in a
* non-preemptible context.
*/
preempt_disable();
kvm_timer_flush_hwstate(vcpu);
kvm_vgic_flush_hwstate(vcpu);
local_irq_disable();