This patch adds the required bits to the VMX side for user space
injected NMIs. As with the preexisting in-kernel irqchip support, the
CPU must provide the "virtual NMI" feature for proper tracking of the
NMI blocking state.
Based on the original patch by Sheng Yang.
Signed-off-by: Jan Kiszka <[EMAIL PROTECTED]>
---
arch/x86/kvm/vmx.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
Index: b/arch/x86/kvm/vmx.c
===================================================================
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2356,6 +2356,7 @@ static void vmx_inject_nmi(struct kvm_vc
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
+ ++vcpu->stat.nmi_injections;
if (vcpu->arch.rmode.active) {
vmx->rmode.irq.pending = true;
vmx->rmode.irq.vector = NMI_VECTOR;
@@ -2424,6 +2425,26 @@ static void do_interrupt_requests(struct
{
vmx_update_window_states(vcpu);
+ if (cpu_has_virtual_nmis()) {
+ if (vcpu->arch.nmi_pending && !vcpu->arch.nmi_injected) {
+ if (vcpu->arch.nmi_window_open) {
+ vcpu->arch.nmi_pending = false;
+ vcpu->arch.nmi_injected = true;
+ } else {
+ enable_nmi_window(vcpu);
+ return;
+ }
+ }
+ if (vcpu->arch.nmi_injected) {
+ vmx_inject_nmi(vcpu);
+ if (vcpu->arch.nmi_pending)
+ enable_nmi_window(vcpu);
+ else if (vcpu->arch.irq_summary)
+ enable_irq_window(vcpu);
+ return;
+ }
+ }
+
if (vcpu->arch.interrupt_window_open) {
if (vcpu->arch.irq_summary && !vcpu->arch.interrupt.pending)
kvm_do_inject_irq(vcpu);
@@ -2936,6 +2957,14 @@ static int handle_nmi_window(struct kvm_
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
++vcpu->stat.nmi_window_exits;
+ /*
+ * If the user space waits to inject a NNI, exit as soon as possible
+ */
+ if (kvm_run->request_nmi_window && !vcpu->arch.nmi_pending) {
+ kvm_run->exit_reason = KVM_EXIT_NMI_WINDOW_OPEN;
+ return 0;
+ }
+
return 1;
}
--
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