KVM: VMX: Define new functions to wrapper direct call of asm code

Define vmcs_load() and kvm_cpu_vmxon() to avoid direct call of asm
code. Also move VMXE bit operation out of kvm_cpu_vmxoff().
Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

arch/x86/kvm/vmx.c

@@ -453,6 +453,19 @@ static void vmcs_clear(struct vmcs *vmcs)
 		       vmcs, phys_addr);
 }
 
+static void vmcs_load(struct vmcs *vmcs)
+{
+	u64 phys_addr = __pa(vmcs);
+	u8 error;
+
+	asm volatile (__ex(ASM_VMX_VMPTRLD_RAX) "; setna %0"
+			: "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
+			: "cc", "memory");
+	if (error)
+		printk(KERN_ERR "kvm: vmptrld %p/%llx fail\n",
+		       vmcs, phys_addr);
+}
+
 static void __vcpu_clear(void *arg)
 {
 	struct vcpu_vmx *vmx = arg;
@@ -830,7 +843,6 @@ static void vmx_load_host_state(struct vcpu_vmx *vmx)
 static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 {
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
-	u64 phys_addr = __pa(vmx->vmcs);
 	u64 tsc_this, delta, new_offset;
 
 	if (vcpu->cpu != cpu) {
@@ -844,15 +856,8 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 	}
 
 	if (per_cpu(current_vmcs, cpu) != vmx->vmcs) {
-		u8 error;
-
 		per_cpu(current_vmcs, cpu) = vmx->vmcs;
-		asm volatile (__ex(ASM_VMX_VMPTRLD_RAX) "; setna %0"
-			      : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
-			      : "cc");
-		if (error)
-			printk(KERN_ERR "kvm: vmptrld %p/%llx fail\n",
-			       vmx->vmcs, phys_addr);
+		vmcs_load(vmx->vmcs);
 	}
 
 	if (vcpu->cpu != cpu) {
@@ -1288,6 +1293,13 @@ static __init int vmx_disabled_by_bios(void)
 	/* locked but not enabled */
 }
 
+static void kvm_cpu_vmxon(u64 addr)
+{
+	asm volatile (ASM_VMX_VMXON_RAX
+			: : "a"(&addr), "m"(addr)
+			: "memory", "cc");
+}
+
 static int hardware_enable(void *garbage)
 {
 	int cpu = raw_smp_processor_id();
@@ -1310,9 +1322,7 @@ static int hardware_enable(void *garbage)
 		wrmsrl(MSR_IA32_FEATURE_CONTROL, old | test_bits);
 	}
 	write_cr4(read_cr4() | X86_CR4_VMXE); /* FIXME: not cpu hotplug safe */
-	asm volatile (ASM_VMX_VMXON_RAX
-		      : : "a"(&phys_addr), "m"(phys_addr)
-		      : "memory", "cc");
+	kvm_cpu_vmxon(phys_addr);
 
 	ept_sync_global();
 
@@ -1336,13 +1346,13 @@ static void vmclear_local_vcpus(void)
 static void kvm_cpu_vmxoff(void)
 {
 	asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc");
-	write_cr4(read_cr4() & ~X86_CR4_VMXE);
 }
 
 static void hardware_disable(void *garbage)
 {
 	vmclear_local_vcpus();
 	kvm_cpu_vmxoff();
+	write_cr4(read_cr4() & ~X86_CR4_VMXE);
 }
 
 static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,