diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 4e05f8c..f8659aa 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -64,12 +64,14 @@ int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu) { int r = 1; - WARN_ON_ONCE(!irqs_disabled()); + WARN_ON(irqs_disabled()); + hard_irq_disable();Here we hard disable in kvmppc_prepare_to_enter(), so my comment in other patch about interrupt loss is no more valid. So here MSR.EE = 0 local_paca->soft_enabled = 0 local_paca->irq_happened |= PACA_IRQ_HARD_DIS;+ while (true) { if (need_resched()) { local_irq_enable();This will make the state: MSR.EE = 1 local_paca->soft_enabled = 1 local_paca->irq_happened = PACA_IRQ_HARD_DIS; //same as before
Why is this same the above state? local_irq_enable() can call __check_irq_replay() to clear PACA_IRQ_HARD_DIS.
Is that a valid state where interrupts are fully enabled and irq_happend in not 0?cond_resched(); - local_irq_disable(); + hard_irq_disable(); continue; } @@ -95,7 +97,7 @@ int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu) local_irq_enable(); trace_kvm_check_requests(vcpu); r = kvmppc_core_check_requests(vcpu); - local_irq_disable(); + hard_irq_disable(); if (r > 0) continue; break; @@ -108,21 +110,14 @@ int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu) } #ifdef CONFIG_PPC64 - /* lazy EE magic */ - hard_irq_disable(); - if (lazy_irq_pending()) { - /* Got an interrupt in between, try again */ - local_irq_enable(); - local_irq_disable(); - kvm_guest_exit(); - continue; - } + WARN_ON(lazy_irq_pending()); #endif kvm_guest_enter(); - break; + return r; } + local_irq_enable(); return r; }int kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu) { int r = 0; WARN_ON_ONCE(!irqs_disabled()); kvmppc_core_check_exceptions(vcpu); if (vcpu->requests) { /* Exception delivery raised request; start over */ return 1; } if (vcpu->arch.shared->msr & MSR_WE) { local_irq_enable(); kvm_vcpu_block(vcpu); clear_bit(KVM_REQ_UNHALT, &vcpu->requests); local_irq_disable(); ^^^ We do not require hard_irq_disable() here?
Between kvmppc_core_prepare_to_enter() and kvmppc_prepare_to_enter(), as I recall Scott had some discussions with Ben earlier.
Tiejun
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