[kvm-ppc-devel] [PATCH 2 of 3] Add PowerPC KVM guest wait handling support

[Jerone Y. <jy...@us...>]

2 files changed, 7 insertions(+), 3 deletions(-)
arch/powerpc/kvm/emulate.c |    5 +++++
arch/powerpc/kvm/powerpc.c |    5 ++---


This patch handles a guest that is in a wait state. This ensures that the guest is not allways eating up 100% cpu when it is idle.

Signed-off-by: Jerone Young <jy...@us...>

diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -265,6 +265,11 @@ int kvmppc_emulate_instruction(struct kv
 		case 146:                                       /* mtmsr */
 			rs = get_rs(inst);
 			kvmppc_set_msr(vcpu, vcpu->arch.gpr[rs]);
+			
+			/* handle guest vcpu that is in wait state */
+			if (vcpu->arch.msr & MSR_WE) {
+				kvm_vcpu_block(vcpu);
+			}
 			break;
 
 		case 163:                                       /* wrteei */
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -36,13 +36,12 @@ gfn_t unalias_gfn(struct kvm *kvm, gfn_t
 
 int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
 {
-	/* XXX implement me */
-	return 0;
+	return !!(v->arch.pending_exceptions);
 }
 
 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
 {
-	return 1;
+	return !(v->arch.msr & MSR_WE);
 }