KVM: x86: Support for user space injected NMIs

Introduces the KVM_NMI IOCTL to the generic x86 part of KVM for
injecting NMIs from user space and also extends the statistic report
accordingly.

Based on the original patch by Sheng Yang.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Sheng Yang <sheng.yang@intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 44 insertions, 2 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1fa9a6db633..07971451b94 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -86,6 +86,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
         { "hypercalls", VCPU_STAT(hypercalls) },
         { "request_irq", VCPU_STAT(request_irq_exits) },
+        { "request_nmi", VCPU_STAT(request_nmi_exits) },
         { "irq_exits", VCPU_STAT(irq_exits) },
         { "host_state_reload", VCPU_STAT(host_state_reload) },
         { "efer_reload", VCPU_STAT(efer_reload) },
@@ -93,6 +94,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
         { "insn_emulation", VCPU_STAT(insn_emulation) },
         { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
         { "irq_injections", VCPU_STAT(irq_injections) },
+        { "nmi_injections", VCPU_STAT(nmi_injections) },
         { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
         { "mmu_pte_write", VM_STAT(mmu_pte_write) },
         { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
@@ -1318,6 +1320,15 @@ static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
         return 0;
 }
 
+static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
+{
+        vcpu_load(vcpu);
+        kvm_inject_nmi(vcpu);
+        vcpu_put(vcpu);
+
+        return 0;
+}
+
 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
                                            struct kvm_tpr_access_ctl *tac)
 {
@@ -1377,6 +1388,13 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
                 r = 0;
                 break;
         }
+        case KVM_NMI: {
+                r = kvm_vcpu_ioctl_nmi(vcpu);
+                if (r)
+                        goto out;
+                r = 0;
+                break;
+        }
         case KVM_SET_CPUID: {
                 struct kvm_cpuid __user *cpuid_arg = argp;
                 struct kvm_cpuid cpuid;
@@ -2812,18 +2830,37 @@ static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu,
                 (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF));
 }
 
+/*
+ * Check if userspace requested a NMI window, and that the NMI window
+ * is open.
+ *
+ * No need to exit to userspace if we already have a NMI queued.
+ */
+static int dm_request_for_nmi_injection(struct kvm_vcpu *vcpu,
+                                        struct kvm_run *kvm_run)
+{
+        return (!vcpu->arch.nmi_pending &&
+                kvm_run->request_nmi_window &&
+                vcpu->arch.nmi_window_open);
+}
+
 static void post_kvm_run_save(struct kvm_vcpu *vcpu,
                               struct kvm_run *kvm_run)
 {
         kvm_run->if_flag = (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
         kvm_run->cr8 = kvm_get_cr8(vcpu);
         kvm_run->apic_base = kvm_get_apic_base(vcpu);
-        if (irqchip_in_kernel(vcpu->kvm))
+        if (irqchip_in_kernel(vcpu->kvm)) {
                 kvm_run->ready_for_interrupt_injection = 1;
-        else
+                kvm_run->ready_for_nmi_injection = 1;
+        } else {
                 kvm_run->ready_for_interrupt_injection =
                                         (vcpu->arch.interrupt_window_open &&
                                          vcpu->arch.irq_summary == 0);
+                kvm_run->ready_for_nmi_injection =
+                                        (vcpu->arch.nmi_window_open &&
+                                         vcpu->arch.nmi_pending == 0);
+        }
 }
 
 static void vapic_enter(struct kvm_vcpu *vcpu)
@@ -2999,6 +3036,11 @@ static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
                 }
 
                 if (r > 0) {
+                        if (dm_request_for_nmi_injection(vcpu, kvm_run)) {
+                                r = -EINTR;
+                                kvm_run->exit_reason = KVM_EXIT_NMI;
+                                ++vcpu->stat.request_nmi_exits;
+                        }
                         if (dm_request_for_irq_injection(vcpu, kvm_run)) {
                                 r = -EINTR;
                                 kvm_run->exit_reason = KVM_EXIT_INTR;