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KVM: PPC: booke: add GS documentation for program interrupt

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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 <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Alexander Graf 2012-02-20 12:33:22 +01:00 committed by Avi Kivity
parent c35c9d84cf
commit 0268597c81
1 changed files with 8 additions and 2 deletions
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10
arch/powerpc/kvm/booke.c
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@ -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);