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KVM: PPC: booke: Check for MSR[WE] in prepare_to_enter 

This prevents us from inappropriately blocking in a KVM_SET_REGS
ioctl -- the MSR[WE] will take effect when the guest is next entered.

It also causes SRR1[WE] to be set when we enter the guest's interrupt
handler, which is what e500 hardware is documented to do.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Scott Wood 2011-11-08 18:23:25 -06:00 committed by Avi Kivity
parent 25051b5a5a
commit c59a6a3e4e
1 changed files with 18 additions and 10 deletions
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28
arch/powerpc/kvm/booke.c
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@ -124,12 +124,6 @@ void kvmppc_set_msr(struct kvm_vcpu *vcpu, u32 new_msr)
vcpu->arch.shared->msr = new_msr;
kvmppc_mmu_msr_notify(vcpu, old_msr);
if (vcpu->arch.shared->msr & MSR_WE) {
kvm_vcpu_block(vcpu);
kvmppc_set_exit_type(vcpu, EMULATED_MTMSRWE_EXITS);
};
kvmppc_vcpu_sync_spe(vcpu);
}
@ -288,15 +282,12 @@ static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu,
return allowed;
}
/* Check pending exceptions and deliver one, if possible. */
void kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu)
static void kvmppc_core_check_exceptions(struct kvm_vcpu *vcpu)
{
unsigned long *pending = &vcpu->arch.pending_exceptions;
unsigned long old_pending = vcpu->arch.pending_exceptions;
unsigned int priority;
WARN_ON_ONCE(!irqs_disabled());
priority = __ffs(*pending);
while (priority <= BOOKE_IRQPRIO_MAX) {
if (kvmppc_booke_irqprio_deliver(vcpu, priority))
@ -314,6 +305,23 @@ void kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu)
vcpu->arch.shared->int_pending = 0;
}
/* Check pending exceptions and deliver one, if possible. */
void kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu)
{
WARN_ON_ONCE(!irqs_disabled());
kvmppc_core_check_exceptions(vcpu);
if (vcpu->arch.shared->msr & MSR_WE) {
local_irq_enable();
kvm_vcpu_block(vcpu);
local_irq_disable();
kvmppc_set_exit_type(vcpu, EMULATED_MTMSRWE_EXITS);
kvmppc_core_check_exceptions(vcpu);
};
}
int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
{
int ret;