On 11/09/2011 01:23 AM, Scott Wood wrote:
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<[email protected]>
---
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();
Hrm. This specific irq enable/disable part isn't pretty but I can't
think of a cleaner way either. Unless you move it out of the prepare
function, since I don't see a way it could race with an interrupt.
+
+ kvmppc_set_exit_type(vcpu, EMULATED_MTMSRWE_EXITS);
+ kvmppc_core_check_exceptions(vcpu);
Shouldn't
if (msr & MSR_WE) {
...
}
core_check_exceptions(vcpu);
work just as well?
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