Merge remote-tracking branches 'spi/fix/bcm2835', 'spi/fix/bcm63xx', 'spi/fix/mpc512x...

[firefly-linux-kernel-4.4.55.git] / arch / arm / kvm / handle_exit.c

diff --git a/arch/arm/kvm/handle_exit.c b/arch/arm/kvm/handle_exit.c
index df4c82d47ad7101cf2f87028d39471cd6d63d7df..a92079011a836974a9188ab8db1fa75f2bc5403a 100644 (file)
--- a/arch/arm/kvm/handle_exit.c
+++ b/arch/arm/kvm/handle_exit.c
@@ -73,23 +73,29 @@ static int handle_dabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
 }
 
 /**
- * kvm_handle_wfi - handle a wait-for-interrupts instruction executed by a guest
+ * kvm_handle_wfx - handle a WFI or WFE instructions trapped in guests
  * @vcpu:      the vcpu pointer
  * @run:       the kvm_run structure pointer
  *
- * Simply sets the wait_for_interrupts flag on the vcpu structure, which will
- * halt execution of world-switches and schedule other host processes until
- * there is an incoming IRQ or FIQ to the VM.
+ * WFE: Yield the CPU and come back to this vcpu when the scheduler
+ * decides to.
+ * WFI: Simply call kvm_vcpu_block(), which will halt execution of
+ * world-switches and schedule other host processes until there is an
+ * incoming IRQ or FIQ to the VM.
  */
-static int kvm_handle_wfi(struct kvm_vcpu *vcpu, struct kvm_run *run)
+static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run)
 {
        trace_kvm_wfi(*vcpu_pc(vcpu));
-       kvm_vcpu_block(vcpu);
+       if (kvm_vcpu_get_hsr(vcpu) & HSR_WFI_IS_WFE)
+               kvm_vcpu_on_spin(vcpu);
+       else
+               kvm_vcpu_block(vcpu);
+
        return 1;
 }
 
 static exit_handle_fn arm_exit_handlers[] = {
-       [HSR_EC_WFI]            = kvm_handle_wfi,
+       [HSR_EC_WFI]            = kvm_handle_wfx,
        [HSR_EC_CP15_32]        = kvm_handle_cp15_32,
        [HSR_EC_CP15_64]        = kvm_handle_cp15_64,
        [HSR_EC_CP14_MR]        = kvm_handle_cp14_access,