[PATCH 10/45] KVM: x86: Move kvm_vcpu_init() invocation to common code

From: Sean Christopherson <hidden>
Date: 2019-10-22 01:59:42
Also in: kvm, kvmarm, linux-mips, lkml
Subsystem: kernel virtual machine for x86 (kvm/x86), the rest, x86 architecture (32-bit and 64-bit) · Maintainers: Sean Christopherson, Paolo Bonzini, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen

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 <redacted>
---
 arch/x86/include/asm/kvm_host.h |  2 +-
 arch/x86/kvm/svm.c              | 13 +++----------
 arch/x86/kvm/vmx/vmx.c          | 19 ++++++-------------
 arch/x86/kvm/x86.c              | 20 +++++++++++++++-----
 4 files changed, 25 insertions(+), 29 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 77581eeb02e3..89d3ff1d6e4d 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h

@@ -1014,7 +1014,7 @@ 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);

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index dc4e835f7d46..5d31016d69ee 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c

@@ -2138,8 +2138,7 @@ 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;

@@ -2151,14 +2150,10 @@ 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)

@@ -2207,8 +2202,7 @@ 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;
 }

@@ -2235,7 +2229,6 @@ 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)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 1973029c5c77..eea03e6fbfa3 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c

@@ -6690,11 +6690,9 @@ static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
 	nested_vmx_free_vcpu(vcpu);
 	free_loaded_vmcs(vmx->loaded_vmcs);
 	kfree(vmx->guest_msrs);
-	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;

@@ -6703,10 +6701,6 @@ 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();

@@ -6720,7 +6714,7 @@ 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;
 	}
 
 	vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL_ACCOUNT);

@@ -6742,7 +6736,7 @@ 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);

@@ -6758,13 +6752,13 @@ 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;
 	}

@@ -6798,8 +6792,7 @@ static int vmx_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	kfree(vmx->guest_msrs);
 free_pml:
 	vmx_destroy_pml_buffer(vmx);
-uninit_vcpu:
-	kvm_vcpu_uninit(vcpu);
+free_vpid:
 	free_vpid(vmx->vpid);
 	return err;
 }

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index b33ca472ff4f..3a6d8c4a9758 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c

@@ -9016,6 +9016,8 @@ 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);

@@ -9037,12 +9039,20 @@ 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)

-- 
2.22.0


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