[PATCH 3.16 053/410] KVM: VMX: introduce alloc_loaded_vmcs

[Ben Hutchings]

3.16.57-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Paolo Bonzini <pbonzini@xxxxxxxxxx>

commit f21f165ef922c2146cc5bdc620f542953c41714b upstream.

Group together the calls to alloc_vmcs and loaded_vmcs_init.  Soon we'll also
allocate an MSR bitmap there.

Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
[bwh: Backported to 3.16:
 - No loaded_vmcs::shadow_vmcs field to initialise
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2999,11 +2999,6 @@ static struct vmcs *alloc_vmcs_cpu(int c
 	return vmcs;
 }
 
-static struct vmcs *alloc_vmcs(void)
-{
-	return alloc_vmcs_cpu(raw_smp_processor_id());
-}
-
 static void free_vmcs(struct vmcs *vmcs)
 {
 	free_pages((unsigned long)vmcs, vmcs_config.order);
@@ -3021,6 +3016,21 @@ static void free_loaded_vmcs(struct load
 	loaded_vmcs->vmcs = NULL;
 }
 
+static struct vmcs *alloc_vmcs(void)
+{
+	return alloc_vmcs_cpu(raw_smp_processor_id());
+}
+
+static int alloc_loaded_vmcs(struct loaded_vmcs *loaded_vmcs)
+{
+	loaded_vmcs->vmcs = alloc_vmcs();
+	if (!loaded_vmcs->vmcs)
+		return -ENOMEM;
+
+	loaded_vmcs_init(loaded_vmcs);
+	return 0;
+}
+
 static void free_kvm_area(void)
 {
 	int cpu;
@@ -5965,6 +5975,7 @@ static int handle_vmon(struct kvm_vcpu *
 	struct vmcs *shadow_vmcs;
 	const u64 VMXON_NEEDED_FEATURES = FEATURE_CONTROL_LOCKED
 		| FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX;
+	int r;
 
 	/* The Intel VMX Instruction Reference lists a bunch of bits that
 	 * are prerequisite to running VMXON, most notably cr4.VMXE must be
@@ -6004,10 +6015,9 @@ static int handle_vmon(struct kvm_vcpu *
 		return 1;
 	}
 
-	vmx->nested.vmcs02.vmcs = alloc_vmcs();
-	if (!vmx->nested.vmcs02.vmcs)
+	r = alloc_loaded_vmcs(&vmx->nested.vmcs02);
+	if (r < 0)
 		return -ENOMEM;
-	loaded_vmcs_init(&vmx->nested.vmcs02);
 
 	if (enable_shadow_vmcs) {
 		shadow_vmcs = alloc_vmcs();
@@ -7612,16 +7622,15 @@ static struct kvm_vcpu *vmx_create_vcpu(
 		goto uninit_vcpu;
 	}
 
-	vmx->loaded_vmcs = &vmx->vmcs01;
-	vmx->loaded_vmcs->vmcs = alloc_vmcs();
-	if (!vmx->loaded_vmcs->vmcs)
-		goto free_msrs;
 	if (!vmm_exclusive)
 		kvm_cpu_vmxon(__pa(per_cpu(vmxarea, raw_smp_processor_id())));
-	loaded_vmcs_init(vmx->loaded_vmcs);
+	err = alloc_loaded_vmcs(&vmx->vmcs01);
 	if (!vmm_exclusive)
 		kvm_cpu_vmxoff();
+	if (err < 0)
+		goto free_msrs;
 
+	vmx->loaded_vmcs = &vmx->vmcs01;
 	cpu = get_cpu();
 	vmx_vcpu_load(&vmx->vcpu, cpu);
 	vmx->vcpu.cpu = cpu;