KVM: x86: Move kvm_vcpu_init() invocation to common code

Move the kvm_cpu_{un}init() calls to common x86 code as an intermediate
step to removing kvm_cpu_{un}init() altogether.

Note, VMX'x alloc_apic_access_page() and init_rmode_identity_map() are
per-VM allocations and are intentionally kept if vCPU creation fails.
They are freed by kvm_arch_destroy_vm().

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/include/asm/kvm_host.h

@@ -1050,7 +1050,7 @@ struct kvm_x86_ops {
 	void (*vm_destroy)(struct kvm *kvm);
 
 	/* Create, but do not attach this VCPU */
-	int (*vcpu_create)(struct kvm *kvm, struct kvm_vcpu *vcpu, unsigned id);
+	int (*vcpu_create)(struct kvm_vcpu *vcpu);
 	void (*vcpu_free)(struct kvm_vcpu *vcpu);
 	void (*vcpu_reset)(struct kvm_vcpu *vcpu, bool init_event);
 

arch/x86/kvm/svm.c

@@ -2187,8 +2187,7 @@ static int avic_init_vcpu(struct vcpu_svm *svm)
 	return ret;
 }
 
-static int svm_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
-			   unsigned int id)
+static int svm_create_vcpu(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_svm *svm;
 	struct page *page;
@@ -2200,14 +2199,10 @@ static int svm_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	BUILD_BUG_ON(offsetof(struct vcpu_svm, vcpu) != 0);
 	svm = to_svm(vcpu);
 
-	err = kvm_vcpu_init(vcpu, kvm, id);
-	if (err)
-		return err;
-
 	err = -ENOMEM;
 	page = alloc_page(GFP_KERNEL_ACCOUNT);
 	if (!page)
-		goto uninit;
+		goto out;
 
 	msrpm_pages = alloc_pages(GFP_KERNEL_ACCOUNT, MSRPM_ALLOC_ORDER);
 	if (!msrpm_pages)
@@ -2256,8 +2251,7 @@ static int svm_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	__free_pages(msrpm_pages, MSRPM_ALLOC_ORDER);
 free_page1:
 	__free_page(page);
-uninit:
-	kvm_vcpu_uninit(vcpu);
+out:
 	return err;
 }
 
@@ -2284,7 +2278,6 @@ static void svm_free_vcpu(struct kvm_vcpu *vcpu)
 	__free_pages(virt_to_page(svm->msrpm), MSRPM_ALLOC_ORDER);
 	__free_page(virt_to_page(svm->nested.hsave));
 	__free_pages(virt_to_page(svm->nested.msrpm), MSRPM_ALLOC_ORDER);
-	kvm_vcpu_uninit(vcpu);
 }
 
 static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)

arch/x86/kvm/vmx/vmx.c

@@ -6681,11 +6681,9 @@ static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
 	free_vpid(vmx->vpid);
 	nested_vmx_free_vcpu(vcpu);
 	free_loaded_vmcs(vmx->loaded_vmcs);
-	kvm_vcpu_uninit(vcpu);
 }
 
-static int vmx_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
-			   unsigned int id)
+static int vmx_create_vcpu(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_vmx *vmx;
 	unsigned long *msr_bitmap;
@@ -6694,10 +6692,6 @@ static int vmx_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	BUILD_BUG_ON(offsetof(struct vcpu_vmx, vcpu) != 0);
 	vmx = to_vmx(vcpu);
 
-	err = kvm_vcpu_init(vcpu, kvm, id);
-	if (err)
-		return err;
-
 	err = -ENOMEM;
 
 	vmx->vpid = allocate_vpid();
@@ -6711,7 +6705,7 @@ static int vmx_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	if (enable_pml) {
 		vmx->pml_pg = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
 		if (!vmx->pml_pg)
-			goto uninit_vcpu;
+			goto free_vpid;
 	}
 
 	BUILD_BUG_ON(ARRAY_SIZE(vmx_msr_index) != NR_SHARED_MSRS);
@@ -6756,7 +6750,7 @@ static int vmx_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_SYSENTER_CS, MSR_TYPE_RW);
 	vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_SYSENTER_ESP, MSR_TYPE_RW);
 	vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_SYSENTER_EIP, MSR_TYPE_RW);
-	if (kvm_cstate_in_guest(kvm)) {
+	if (kvm_cstate_in_guest(vcpu->kvm)) {
 		vmx_disable_intercept_for_msr(msr_bitmap, MSR_CORE_C1_RES, MSR_TYPE_R);
 		vmx_disable_intercept_for_msr(msr_bitmap, MSR_CORE_C3_RESIDENCY, MSR_TYPE_R);
 		vmx_disable_intercept_for_msr(msr_bitmap, MSR_CORE_C6_RESIDENCY, MSR_TYPE_R);
@@ -6772,13 +6766,13 @@ static int vmx_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	vmx_vcpu_put(vcpu);
 	put_cpu();
 	if (cpu_need_virtualize_apic_accesses(vcpu)) {
-		err = alloc_apic_access_page(kvm);
+		err = alloc_apic_access_page(vcpu->kvm);
 		if (err)
 			goto free_vmcs;
 	}
 
 	if (enable_ept && !enable_unrestricted_guest) {
-		err = init_rmode_identity_map(kvm);
+		err = init_rmode_identity_map(vcpu->kvm);
 		if (err)
 			goto free_vmcs;
 	}
@@ -6810,8 +6804,7 @@ static int vmx_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	free_loaded_vmcs(vmx->loaded_vmcs);
 free_pml:
 	vmx_destroy_pml_buffer(vmx);
-uninit_vcpu:
-	kvm_vcpu_uninit(vcpu);
+free_vpid:
 	free_vpid(vmx->vpid);
 	return err;
 }

arch/x86/kvm/x86.c

@@ -9176,6 +9176,8 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 
 	kvm_x86_ops->vcpu_free(vcpu);
 
+	kvm_vcpu_uninit(vcpu);
+
 	free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
 	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
 	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
@@ -9197,12 +9199,20 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
 	if (!vcpu)
 		return ERR_PTR(-ENOMEM);
 
-	r = kvm_x86_ops->vcpu_create(kvm, vcpu, id);
-	if (r) {
-		kmem_cache_free(kvm_vcpu_cache, vcpu);
-		return ERR_PTR(r);
-	}
+	r = kvm_vcpu_init(vcpu, kvm, id);
+	if (r)
+		goto free_vcpu;
+
+	r = kvm_x86_ops->vcpu_create(vcpu);
+	if (r)
+		goto uninit_vcpu;
 	return vcpu;
+
+uninit_vcpu:
+	kvm_vcpu_uninit(vcpu);
+free_vcpu:
+	kmem_cache_free(kvm_vcpu_cache, vcpu);
+	return ERR_PTR(r);
 }
 
 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)