From 37b96e988053c4dd21811b0408a12f8f60b4d0c8 Mon Sep 17 00:00:00 2001 From: Gleb Natapov Date: Mon, 30 Mar 2009 16:03:13 +0300 Subject: [PATCH] KVM: VMX: Rewrite vmx_complete_interrupt()'s twisted maze of if() statements ...with a more straightforward switch(). Also fix a bug when NMI could be dropped on exit. Although this should never happen in practice, since NMIs can only be injected, never triggered internally by the guest like exceptions. Signed-off-by: Gleb Natapov Signed-off-by: Avi Kivity --- arch/x86/kvm/vmx.c | 43 +++++++++++++++++++++++++------------------ 1 file changed, 25 insertions(+), 18 deletions(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 631f9b720971..577aa9551a97 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -3277,7 +3277,6 @@ static void vmx_complete_interrupts(struct vcpu_vmx *vmx) u8 vector; int type; bool idtv_info_valid; - u32 error; idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK; exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO); @@ -3302,34 +3301,42 @@ static void vmx_complete_interrupts(struct vcpu_vmx *vmx) vmx->vnmi_blocked_time += ktime_to_ns(ktime_sub(ktime_get(), vmx->entry_time)); + vmx->vcpu.arch.nmi_injected = false; + kvm_clear_exception_queue(&vmx->vcpu); + kvm_clear_interrupt_queue(&vmx->vcpu); + + if (!idtv_info_valid) + return; + vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK; type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK; - if (vmx->vcpu.arch.nmi_injected) { + + switch(type) { + case INTR_TYPE_NMI_INTR: + vmx->vcpu.arch.nmi_injected = true; /* * SDM 3: 27.7.1.2 (September 2008) - * Clear bit "block by NMI" before VM entry if a NMI delivery - * faulted. + * Clear bit "block by NMI" before VM entry if a NMI + * delivery faulted. */ - if (idtv_info_valid && type == INTR_TYPE_NMI_INTR) - vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO, - GUEST_INTR_STATE_NMI); - else - vmx->vcpu.arch.nmi_injected = false; - } - kvm_clear_exception_queue(&vmx->vcpu); - if (idtv_info_valid && (type == INTR_TYPE_HARD_EXCEPTION || - type == INTR_TYPE_SOFT_EXCEPTION)) { + vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO, + GUEST_INTR_STATE_NMI); + break; + case INTR_TYPE_HARD_EXCEPTION: + case INTR_TYPE_SOFT_EXCEPTION: if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) { - error = vmcs_read32(IDT_VECTORING_ERROR_CODE); - kvm_queue_exception_e(&vmx->vcpu, vector, error); + u32 err = vmcs_read32(IDT_VECTORING_ERROR_CODE); + kvm_queue_exception_e(&vmx->vcpu, vector, err); } else kvm_queue_exception(&vmx->vcpu, vector); vmx->idt_vectoring_info = 0; - } - kvm_clear_interrupt_queue(&vmx->vcpu); - if (idtv_info_valid && type == INTR_TYPE_EXT_INTR) { + break; + case INTR_TYPE_EXT_INTR: kvm_queue_interrupt(&vmx->vcpu, vector); vmx->idt_vectoring_info = 0; + break; + default: + break; } }