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Subject[PATCH 07/40] KVM: Move NMI IRET fault processing to new vmx_complete_interrupts()
Date
From: Avi Kivity <avi@qumranet.com>

Currently most interrupt exit processing is handled on the entry path,
which is confusing. Move the NMI IRET fault processing to a new function,
vmx_complete_interrupts(), which is called on the vmexit path.

Signed-off-by: Avi Kivity <avi@qumranet.com>
---
arch/x86/kvm/vmx.c | 36 ++++++++++++++++++++++++------------
1 files changed, 24 insertions(+), 12 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 5a3a032..2adfacb 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2817,6 +2817,27 @@ static void enable_intr_window(struct kvm_vcpu *vcpu)
enable_irq_window(vcpu);
}

+static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
+{
+ u32 exit_intr_info;
+ bool unblock_nmi;
+ u8 vector;
+
+ exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
+ if (cpu_has_virtual_nmis()) {
+ unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0;
+ vector = exit_intr_info & INTR_INFO_VECTOR_MASK;
+ /*
+ * SDM 3: 25.7.1.2
+ * Re-set bit "block by NMI" before VM entry if vmexit caused by
+ * a guest IRET fault.
+ */
+ if (unblock_nmi && vector != DF_VECTOR)
+ vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
+ GUEST_INTR_STATE_NMI);
+ }
+}
+
static void vmx_intr_assist(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
@@ -2873,23 +2894,12 @@ static void vmx_intr_assist(struct kvm_vcpu *vcpu)
return;
}
if (cpu_has_virtual_nmis()) {
- /*
- * SDM 3: 25.7.1.2
- * Re-set bit "block by NMI" before VM entry if vmexit caused by
- * a guest IRET fault.
- */
- if ((exit_intr_info_field & INTR_INFO_UNBLOCK_NMI) &&
- (exit_intr_info_field & INTR_INFO_VECTOR_MASK) != 8)
- vmcs_write32(GUEST_INTERRUPTIBILITY_INFO,
- vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) |
- GUEST_INTR_STATE_NMI);
- else if (vcpu->arch.nmi_pending) {
+ if (vcpu->arch.nmi_pending) {
if (vmx_nmi_enabled(vcpu))
vmx_inject_nmi(vcpu);
enable_intr_window(vcpu);
return;
}
-
}
if (!kvm_cpu_has_interrupt(vcpu))
return;
@@ -3076,6 +3086,8 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
KVMTRACE_0D(NMI, vcpu, handler);
asm("int $2");
}
+
+ vmx_complete_interrupts(vmx);
}

static void vmx_free_vmcs(struct kvm_vcpu *vcpu)
--
1.6.0.1


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