From: Alexander Graf Date: Mon, 20 Feb 2012 11:33:22 +0000 (+0100) Subject: KVM: PPC: booke: add GS documentation for program interrupt X-Git-Url: http://git.mmlx.us/?a=commitdiff_plain;h=0268597c811ccf55e0bda20907c1a9e6001365cf;p=linux-edison.git KVM: PPC: booke: add GS documentation for program interrupt The comment for program interrupts triggered when using bookehv was misleading. Update it to mention why MSR_GS indicates that we have to inject an interrupt into the guest again, not emulate it. Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index af02d9dbd95..7df3f3ae71d 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -685,8 +685,14 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu, case BOOKE_INTERRUPT_PROGRAM: if (vcpu->arch.shared->msr & (MSR_PR | MSR_GS)) { - /* Program traps generated by user-level software must be handled - * by the guest kernel. */ + /* + * Program traps generated by user-level software must + * be handled by the guest kernel. + * + * In GS mode, hypervisor privileged instructions trap + * on BOOKE_INTERRUPT_HV_PRIV, not here, so these are + * actual program interrupts, handled by the guest. + */ kvmppc_core_queue_program(vcpu, vcpu->arch.fault_esr); r = RESUME_GUEST; kvmppc_account_exit(vcpu, USR_PR_INST);