KVM: Use kmem_cache_free for kmem_cache_zalloc'ed objects

We use kfree in svm.c and vmx.c, and this works, but it could break at
any time.  kfree() is supposed to match up with kmalloc().
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Avi Kivity <avi@qumranet.com>

drivers/kvm/svm.c

@@ -610,7 +610,7 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 uninit:
 	kvm_vcpu_uninit(&svm->vcpu);
 free_svm:
-	kfree(svm);
+	kmem_cache_free(kvm_vcpu_cache, svm);
 out:
 	return ERR_PTR(err);
 }
@@ -621,7 +621,7 @@ static void svm_free_vcpu(struct kvm_vcpu *vcpu)
 
 	__free_page(pfn_to_page(svm->vmcb_pa >> PAGE_SHIFT));
 	kvm_vcpu_uninit(vcpu);
-	kfree(svm);
+	kmem_cache_free(kvm_vcpu_cache, svm);
 }
 
 static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)

drivers/kvm/vmx.c

@@ -2359,7 +2359,7 @@ static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
 	kfree(vmx->host_msrs);
 	kfree(vmx->guest_msrs);
 	kvm_vcpu_uninit(vcpu);
-	kfree(vmx);
+	kmem_cache_free(kvm_vcpu_cache, vmx);
 }
 
 static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
@@ -2410,7 +2410,7 @@ free_guest_msrs:
 uninit_vcpu:
 	kvm_vcpu_uninit(&vmx->vcpu);
 free_vcpu:
-	kfree(vmx);
+	kmem_cache_free(kvm_vcpu_cache, vmx);
 	return ERR_PTR(err);
 }