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KVM: arm/arm64: check power_off in critical section before VCPU run

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In case a vcpu off PSCI call is called just after we executed the
vcpu_sleep check, we can enter the guest although power_off
is set. Let's check the power_off state in the critical section,
just before entering the guest.

Signed-off-by: Eric Auger <[email protected]>
Reported-by: Christoffer Dall <[email protected]>
Reviewed-by: Christoffer Dall <[email protected]>
Signed-off-by: Christoffer Dall <[email protected]>
This commit is contained in:
Eric Auger 2015-09-25 23:41:16 +02:00 • committed by Christoffer Dall
commit 101d3da09c
1 changed files with 2 additions and 1 deletions
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3
arch/arm/kvm/arm.c
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@ -560,7 +560,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
run->exit_reason = KVM_EXIT_INTR;
}
if (ret <= 0 || need_new_vmid_gen(vcpu->kvm)) {
if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) ||
vcpu->arch.power_off) {
local_irq_enable();
kvm_timer_sync_hwstate(vcpu);
kvm_vgic_sync_hwstate(vcpu);