KVM: x86: Consolidate VM allocation and free for VMX and SVM

Move the VM allocation and free code to common x86 as the logic is
more or less identical across SVM and VMX.

Note, although hyperv.hv_pa_pg is part of the common kvm->arch, it's
(currently) only allocated by VMX VMs.  But, since kfree() plays nice
when passed a NULL pointer, the superfluous call for SVM is harmless
and avoids future churn if SVM gains support for HyperV's direct TLB
flush.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
[Make vm_size a field instead of a function. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4b47497..ddd1d29 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9622,6 +9622,13 @@ void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu)
 	kvm_x86_ops->sched_in(vcpu, cpu);
 }
 
+void kvm_arch_free_vm(struct kvm *kvm)
+{
+	kfree(kvm->arch.hyperv.hv_pa_pg);
+	vfree(kvm);
+}
+
+
 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 {
 	if (type)