KVM: SVM: Use direct vcpu pointer during vCPU create/free

Capture the vcpu pointer in a local varaible and replace '&svm->vcpu'
references with a direct reference to the pointer in anticipation of
moving bits of the code to common x86 and passing the vcpu pointer into
svm_create_vcpu(), i.e. eliminate unnecessary noise from future patches.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/svm.c

@@ -2189,6 +2189,7 @@ static int avic_init_vcpu(struct vcpu_svm *svm)
 
 static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 {
+	struct kvm_vcpu *vcpu;
 	struct vcpu_svm *svm;
 	struct page *page;
 	struct page *msrpm_pages;
@@ -2204,24 +2205,25 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 		err = -ENOMEM;
 		goto out;
 	}
+	vcpu = &svm->vcpu;
 
-	svm->vcpu.arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache,
-						     GFP_KERNEL_ACCOUNT);
-	if (!svm->vcpu.arch.user_fpu) {
+	vcpu->arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache,
+						GFP_KERNEL_ACCOUNT);
+	if (!vcpu->arch.user_fpu) {
 		printk(KERN_ERR "kvm: failed to allocate kvm userspace's fpu\n");
 		err = -ENOMEM;
 		goto free_partial_svm;
 	}
 
-	svm->vcpu.arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache,
-						     GFP_KERNEL_ACCOUNT);
-	if (!svm->vcpu.arch.guest_fpu) {
+	vcpu->arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache,
+						 GFP_KERNEL_ACCOUNT);
+	if (!vcpu->arch.guest_fpu) {
 		printk(KERN_ERR "kvm: failed to allocate vcpu's fpu\n");
 		err = -ENOMEM;
 		goto free_user_fpu;
 	}
 
-	err = kvm_vcpu_init(&svm->vcpu, kvm, id);
+	err = kvm_vcpu_init(vcpu, kvm, id);
 	if (err)
 		goto free_svm;
 
@@ -2265,9 +2267,9 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 	svm->asid_generation = 0;
 	init_vmcb(svm);
 
-	svm_init_osvw(&svm->vcpu);
+	svm_init_osvw(vcpu);
 
-	return &svm->vcpu;
+	return vcpu;
 
 free_page4:
 	__free_page(hsave_page);
@@ -2278,11 +2280,11 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 free_page1:
 	__free_page(page);
 uninit:
-	kvm_vcpu_uninit(&svm->vcpu);
+	kvm_vcpu_uninit(vcpu);
 free_svm:
-	kmem_cache_free(x86_fpu_cache, svm->vcpu.arch.guest_fpu);
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
 free_user_fpu:
-	kmem_cache_free(x86_fpu_cache, svm->vcpu.arch.user_fpu);
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
 free_partial_svm:
 	kmem_cache_free(kvm_vcpu_cache, svm);
 out:
@@ -2313,8 +2315,8 @@ static void svm_free_vcpu(struct kvm_vcpu *vcpu)
 	__free_page(virt_to_page(svm->nested.hsave));
 	__free_pages(virt_to_page(svm->nested.msrpm), MSRPM_ALLOC_ORDER);
 	kvm_vcpu_uninit(vcpu);
-	kmem_cache_free(x86_fpu_cache, svm->vcpu.arch.user_fpu);
-	kmem_cache_free(x86_fpu_cache, svm->vcpu.arch.guest_fpu);
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
 	kmem_cache_free(kvm_vcpu_cache, svm);
 }