| Message ID | 1438963713-10460-4-git-send-email-eric.auger@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, Aug 07, 2015 at 06:08:32PM +0200, Eric Auger wrote: > In case KVM_SET_MP_STATE ioctl is called just after we executed the > vcpu_sleep check, we can enter the guest although KVM_MP_STATE_STOPPED > is set. Let's check the power_off state in the critical section, > just before entering the guest. I don't think this can happen from the KVM_SET_MP_STATE, because that is a vcpu ioctl and would therefore require userspace sets this before even entering the run loop in the kernel, but it could happen at the PSCI system event preparation. > > Signed-off-by: Eric Auger <eric.auger@linaro.org> > Reported-by: Christoffer Dall <christoffer.dall@linaro.org> > --- > arch/arm/kvm/arm.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c > index 4f50be3..cc404a8 100644 > --- a/arch/arm/kvm/arm.c > +++ b/arch/arm/kvm/arm.c > @@ -555,7 +555,8 @@ 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_vgic_sync_hwstate(vcpu); > preempt_enable(); > -- > 1.9.1 >
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index 4f50be3..cc404a8 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -555,7 +555,8 @@ 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_vgic_sync_hwstate(vcpu); preempt_enable();
In case KVM_SET_MP_STATE ioctl is called just after we executed the vcpu_sleep check, we can enter the guest although KVM_MP_STATE_STOPPED is set. Let's check the power_off state in the critical section, just before entering the guest. Signed-off-by: Eric Auger <eric.auger@linaro.org> Reported-by: Christoffer Dall <christoffer.dall@linaro.org> --- arch/arm/kvm/arm.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)