KVM: PPC: Allocate vcpu struct in common PPC code

Move allocation of all flavors of PPC vCPUs to common PPC code.  All
variants either allocate 'struct kvm_vcpu' directly, or require that
the embedded 'struct kvm_vcpu' member be located at offset 0, i.e.
guarantee that the allocation can be directly interpreted as a 'struct
kvm_vcpu' object.

Remove the message from the build-time assertion regarding placement of
the struct, as compatibility with the arch usercopy region is no longer
the sole dependent on 'struct kvm_vcpu' being at offset zero.

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

1 files changed, 6 insertions, 18 deletions

diff --git a/arch/powerpc/kvm/e500mc.c b/arch/powerpc/kvm/e500mc.c
index c51f4bb086fd..7c0d392f667a 100644
--- a/arch/powerpc/kvm/e500mc.c
+++ b/arch/powerpc/kvm/e500mc.c
@@ -301,28 +301,21 @@ static int kvmppc_set_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
 	return r;
 }
 
-static struct kvm_vcpu *kvmppc_core_vcpu_create_e500mc(struct kvm *kvm,
-						       unsigned int id)
+static int kvmppc_core_vcpu_create_e500mc(struct kvm *kvm, struct kvm_vcpu *vcpu,
+					  unsigned int id)
 {
 	struct kvmppc_vcpu_e500 *vcpu_e500;
-	struct kvm_vcpu *vcpu;
 	int err;
 
 	BUILD_BUG_ON(offsetof(struct kvmppc_vcpu_e500, vcpu) != 0);
-
-	vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
-	if (!vcpu_e500) {
-		err = -ENOMEM;
-		goto out;
-	}
-	vcpu = &vcpu_e500->vcpu;
+	vcpu_e500 = to_e500(vcpu);
 
 	/* Invalid PIR value -- this LPID dosn't have valid state on any cpu */
 	vcpu->arch.oldpir = 0xffffffff;
 
 	err = kvm_vcpu_init(vcpu, kvm, id);
 	if (err)
-		goto free_vcpu;
+		return err;
 
 	err = kvmppc_e500_tlb_init(vcpu_e500);
 	if (err)
@@ -334,17 +327,13 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_e500mc(struct kvm *kvm,
 		goto uninit_tlb;
 	}
 
-	return vcpu;
+	return 0;
 
 uninit_tlb:
 	kvmppc_e500_tlb_uninit(vcpu_e500);
 uninit_vcpu:
 	kvm_vcpu_uninit(vcpu);
-
-free_vcpu:
-	kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
-out:
-	return ERR_PTR(err);
+	return err;
 }
 
 static void kvmppc_core_vcpu_free_e500mc(struct kvm_vcpu *vcpu)
@@ -354,7 +343,6 @@ static void kvmppc_core_vcpu_free_e500mc(struct kvm_vcpu *vcpu)
 	free_page((unsigned long)vcpu->arch.shared);
 	kvmppc_e500_tlb_uninit(vcpu_e500);
 	kvm_vcpu_uninit(vcpu);
-	kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
 }
 
 static int kvmppc_core_init_vm_e500mc(struct kvm *kvm)