[PATCH] KVM: X86: Make fpu allocation a common function

[Xiaoyao Li]

They are duplicated codes to create vcpu.arch.{user,guest}_fpu in VMX
and SVM. Make them common functions.

No functional change intended.

Signed-off-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
---
 arch/x86/kvm/svm.c     | 20 +++-----------------
 arch/x86/kvm/vmx/vmx.c | 20 +++-----------------
 arch/x86/kvm/x86.h     | 26 ++++++++++++++++++++++++++
 3 files changed, 32 insertions(+), 34 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index e479ea9bc9da..0116a3c37a07 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2156,21 +2156,9 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 		goto out;
 	}
 
-	svm->vcpu.arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache,
-						     GFP_KERNEL_ACCOUNT);
-	if (!svm->vcpu.arch.user_fpu) {
-		printk(KERN_ERR "kvm: failed to allocate kvm userspace's fpu\n");
-		err = -ENOMEM;
+	err = kvm_vcpu_create_fpu(&svm->vcpu);
+	if (err)
 		goto free_partial_svm;
-	}
-
-	svm->vcpu.arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache,
-						     GFP_KERNEL_ACCOUNT);
-	if (!svm->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);
 	if (err)
@@ -2231,9 +2219,7 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 uninit:
 	kvm_vcpu_uninit(&svm->vcpu);
 free_svm:
-	kmem_cache_free(x86_fpu_cache, svm->vcpu.arch.guest_fpu);
-free_user_fpu:
-	kmem_cache_free(x86_fpu_cache, svm->vcpu.arch.user_fpu);
+	kvm_vcpu_free_fpu(&svm->vcpu);
 free_partial_svm:
 	kmem_cache_free(kvm_vcpu_cache, svm);
 out:
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index e660e28e9ae0..53d9298ff648 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6710,21 +6710,9 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
 	if (!vmx)
 		return ERR_PTR(-ENOMEM);
 
-	vmx->vcpu.arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache,
-			GFP_KERNEL_ACCOUNT);
-	if (!vmx->vcpu.arch.user_fpu) {
-		printk(KERN_ERR "kvm: failed to allocate kvm userspace's fpu\n");
-		err = -ENOMEM;
+	err = kvm_vcpu_create_fpu(&vmx->vcpu);
+	if (err)
 		goto free_partial_vcpu;
-	}
-
-	vmx->vcpu.arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache,
-			GFP_KERNEL_ACCOUNT);
-	if (!vmx->vcpu.arch.guest_fpu) {
-		printk(KERN_ERR "kvm: failed to allocate vcpu's fpu\n");
-		err = -ENOMEM;
-		goto free_user_fpu;
-	}
 
 	vmx->vpid = allocate_vpid();
 
@@ -6825,9 +6813,7 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
 	kvm_vcpu_uninit(&vmx->vcpu);
 free_vcpu:
 	free_vpid(vmx->vpid);
-	kmem_cache_free(x86_fpu_cache, vmx->vcpu.arch.guest_fpu);
-free_user_fpu:
-	kmem_cache_free(x86_fpu_cache, vmx->vcpu.arch.user_fpu);
+	kvm_vcpu_free_fpu(&vmx->vcpu);
 free_partial_vcpu:
 	kmem_cache_free(kvm_vcpu_cache, vmx);
 	return ERR_PTR(err);
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 45d82b8277e5..c27e7ac91337 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -367,4 +367,30 @@ static inline bool kvm_pat_valid(u64 data)
 void kvm_load_guest_xcr0(struct kvm_vcpu *vcpu);
 void kvm_put_guest_xcr0(struct kvm_vcpu *vcpu);
 
+static inline int kvm_vcpu_create_fpu(struct kvm_vcpu *vcpu)
+{
+	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");
+		return -ENOMEM;
+	}
+
+	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");
+		kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static inline void kvm_vcpu_free_fpu(struct kvm_vcpu *vcpu)
+{
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
+}
+
 #endif
-- 
2.19.1