[PATCH 14/52] KVM: PPC: booke: Check for MSR[WE] in prepare_to_enter

Alexander Graf
2012-01-13T14:58:37Z

From: Scott Wood <scottwood@freescale.com>

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>
---
arch/powerpc/kvm/booke.c | 28 ++++++++++++++++++----------
1 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index feaefc4..557f028 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -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;
--
1.6.0.2