[PATCH 4/4] make sure kvm_vpu_init is the last thing called in cpu initialization

[Glauber Costa <glommer@redhat.com>]

KVM access some state that is only present late in cpu initialization.
This happens in kvm_vcpu_init(). APIC is an example of that.

So we have to make sure that kvm_vcpu_init is the last thing called
in the initialization process.

We also have to explicitly call qemu_kvm_load_apic(), since the
first call will find the vcpu non initialized.

Signed-off-by: Glauber Costa <glommer@redhat.com>
---
 hw/pc.c              |    5 +++++
 qemu-kvm-x86.c       |    2 ++
 target-i386/helper.c |    2 --
 3 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/hw/pc.c b/hw/pc.c
index 9e99b7c..45de6d9 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -844,6 +844,11 @@ CPUState *pc_new_cpu(int cpu, const char *cpu_model, int pci_enabled)
         if (pci_enabled) {
             apic_init(env);
         }
+
+    /* kvm needs this to run after the apic is initialized. Otherwise,
+     * it can access invalid state and crash.
+     */
+    qemu_init_vcpu(env);
 	return env;
 }
 
diff --git a/qemu-kvm-x86.c b/qemu-kvm-x86.c
index fcb594c..98aa530 100644
--- a/qemu-kvm-x86.c
+++ b/qemu-kvm-x86.c
@@ -527,6 +527,8 @@ int kvm_arch_qemu_init_env(CPUState *cenv)
     CPUState copy;
     uint32_t i, j, limit;
 
+    qemu_kvm_load_lapic(cenv);
+
     copy = *cenv;
 
 #ifdef KVM_CPUID_SIGNATURE
diff --git a/target-i386/helper.c b/target-i386/helper.c
index 848d05b..6dc0111 100644
--- a/target-i386/helper.c
+++ b/target-i386/helper.c
@@ -1699,7 +1699,5 @@ CPUX86State *cpu_x86_init(const char *cpu_model)
     kqemu_init(env);
 #endif
 
-    qemu_init_vcpu(env);
-
     return env;
 }
-- 
1.5.6.6