pc: kvm_apic: Pass APIC ID depending on xAPIC/x2APIC mode

Signed-off-by: Igor Mammedov <imammedo@redhat.com> Reviewed-by: Radim Krčmář <rkrcmar@redhat.com> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
qemu · Oct 24, 2016 · e391c00 · e391c00
1 parent facb07c
commit e391c00
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Showing 3 changed files with 21 additions and 5 deletions.
diff --git a/hw/i386/kvm/apic.c b/hw/i386/kvm/apic.c
@@ -34,7 +34,11 @@ static void kvm_put_apic_state(APICCommonState *s, struct kvm_lapic_state *kapic
     int i;
 
     memset(kapic, 0, sizeof(*kapic));
-    kvm_apic_set_reg(kapic, 0x2, s->id << 24);
+    if (kvm_has_x2apic_api() && s->apicbase & MSR_IA32_APICBASE_EXTD) {
+        kvm_apic_set_reg(kapic, 0x2, s->initial_apic_id);
+    } else {
+        kvm_apic_set_reg(kapic, 0x2, s->id << 24);
+    }
     kvm_apic_set_reg(kapic, 0x8, s->tpr);
     kvm_apic_set_reg(kapic, 0xd, s->log_dest << 24);
     kvm_apic_set_reg(kapic, 0xe, s->dest_mode << 28 | 0x0fffffff);
@@ -59,7 +63,11 @@ void kvm_get_apic_state(DeviceState *dev, struct kvm_lapic_state *kapic)
     APICCommonState *s = APIC_COMMON(dev);
     int i, v;
 
-    s->id = kvm_apic_get_reg(kapic, 0x2) >> 24;
+    if (kvm_has_x2apic_api() && s->apicbase & MSR_IA32_APICBASE_EXTD) {
+        assert(kvm_apic_get_reg(kapic, 0x2) == s->initial_apic_id);
+    } else {
+        s->id = kvm_apic_get_reg(kapic, 0x2) >> 24;
+    }
     s->tpr = kvm_apic_get_reg(kapic, 0x8);
     s->arb_id = kvm_apic_get_reg(kapic, 0x9);
     s->log_dest = kvm_apic_get_reg(kapic, 0xd) >> 24;

diff --git a/target-i386/kvm.c b/target-i386/kvm.c
@@ -129,9 +129,8 @@ static bool kvm_x2apic_api_set_flags(uint64_t flags)
     return !kvm_vm_enable_cap(s, KVM_CAP_X2APIC_API, 0, flags);
 }
 
-#define MEMORIZE(fn) \
+#define MEMORIZE(fn, _result) \
     ({ \
-        static typeof(fn) _result; \
         static bool _memorized; \
         \
         if (_memorized) { \
@@ -141,11 +140,19 @@ static bool kvm_x2apic_api_set_flags(uint64_t flags)
         _result = fn; \
     })
 
+static bool has_x2apic_api;
+
+bool kvm_has_x2apic_api(void)
+{
+    return has_x2apic_api;
+}
+
 bool kvm_enable_x2apic(void)
 {
     return MEMORIZE(
              kvm_x2apic_api_set_flags(KVM_X2APIC_API_USE_32BIT_IDS |
-                                      KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK));
+                                      KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK),
+             has_x2apic_api);
 }
 
 static int kvm_get_tsc(CPUState *cs)

diff --git a/target-i386/kvm_i386.h b/target-i386/kvm_i386.h
@@ -44,4 +44,5 @@ int kvm_device_msix_deassign(KVMState *s, uint32_t dev_id);
 void kvm_put_apicbase(X86CPU *cpu, uint64_t value);
 
 bool kvm_enable_x2apic(void);
+bool kvm_has_x2apic_api(void);
 #endif