kvm: x86: Add user space part for in-kernel APIC

This introduces the alternative APIC device which makes use of KVM's
in-kernel device model. External NMI injection via LINT1 is emulated by
checking the current state of the in-kernel APIC, only injecting a NMI
into the VCPU if LINT1 is unmasked and configured to DM_NMI.

MSI is not yet supported, so we disable this when the in-kernel model is
in use.

CC: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index f6f4189..e41de39 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -1337,6 +1337,36 @@ static int kvm_get_mp_state(CPUState *env)
     return 0;
 }
 
+static int kvm_get_apic(CPUState *env)
+{
+    DeviceState *apic = env->apic_state;
+    struct kvm_lapic_state kapic;
+    int ret;
+
+    if (apic && kvm_enabled() && kvm_irqchip_in_kernel()) {
+        ret = kvm_vcpu_ioctl(env, KVM_GET_LAPIC, &kapic);
+        if (ret < 0) {
+            return ret;
+        }
+
+        kvm_get_apic_state(apic, &kapic);
+    }
+    return 0;
+}
+
+static int kvm_put_apic(CPUState *env)
+{
+    DeviceState *apic = env->apic_state;
+    struct kvm_lapic_state kapic;
+
+    if (apic && kvm_enabled() && kvm_irqchip_in_kernel()) {
+        kvm_put_apic_state(apic, &kapic);
+
+        return kvm_vcpu_ioctl(env, KVM_SET_LAPIC, &kapic);
+    }
+    return 0;
+}
+
 static int kvm_put_vcpu_events(CPUState *env, int level)
 {
     struct kvm_vcpu_events events;
@@ -1510,6 +1540,10 @@ int kvm_arch_put_registers(CPUState *env, int level)
         if (ret < 0) {
             return ret;
         }
+        ret = kvm_put_apic(env);
+        if (ret < 0) {
+            return ret;
+        }
     }
     ret = kvm_put_vcpu_events(env, level);
     if (ret < 0) {
@@ -1557,6 +1591,10 @@ int kvm_arch_get_registers(CPUState *env)
     if (ret < 0) {
         return ret;
     }
+    ret = kvm_get_apic(env);
+    if (ret < 0) {
+        return ret;
+    }
     ret = kvm_get_vcpu_events(env);
     if (ret < 0) {
         return ret;