Merge tag 'iwlwifi-next-for-kalle-2014-12-30' of https://git.kernel.org/pub/scm/linux...

[cascardo/linux.git] / arch / arm / kvm / psci.c

diff --git a/arch/arm/kvm/psci.c b/arch/arm/kvm/psci.c
index 09cf377..58cb324 100644 (file)
--- a/arch/arm/kvm/psci.c
+++ b/arch/arm/kvm/psci.c
@@ -15,6 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <linux/preempt.h>
 #include <linux/kvm_host.h>
 #include <linux/wait.h>
 
@@ -166,6 +167,23 @@ static unsigned long kvm_psci_vcpu_affinity_info(struct kvm_vcpu *vcpu)
 
 static void kvm_prepare_system_event(struct kvm_vcpu *vcpu, u32 type)
 {
+       int i;
+       struct kvm_vcpu *tmp;
+
+       /*
+        * The KVM ABI specifies that a system event exit may call KVM_RUN
+        * again and may perform shutdown/reboot at a later time that when the
+        * actual request is made.  Since we are implementing PSCI and a
+        * caller of PSCI reboot and shutdown expects that the system shuts
+        * down or reboots immediately, let's make sure that VCPUs are not run
+        * after this call is handled and before the VCPUs have been
+        * re-initialized.
+        */
+       kvm_for_each_vcpu(i, tmp, vcpu->kvm) {
+               tmp->arch.pause = true;
+               kvm_vcpu_kick(tmp);
+       }
+
        memset(&vcpu->run->system_event, 0, sizeof(vcpu->run->system_event));
        vcpu->run->system_event.type = type;
        vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;