KVM: x86: Move call to update_exception_bitmap() into VMX code

Now that vcpu_after_set_cpuid() and update_exception_bitmap() are called
back-to-back, subsume the exception bitmap update into the common CPUID
update.  Drop the SVM invocation entirely as SVM's exception bitmap
doesn't vary with respect to guest CPUID.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200930041659.28181-4-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/cpuid.c

@@ -171,7 +171,6 @@ static void kvm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
 
 	/* Invoke the vendor callback only after the above state is updated. */
 	kvm_x86_ops.vcpu_after_set_cpuid(vcpu);
-	kvm_x86_ops.update_exception_bitmap(vcpu);
 }
 
 static int is_efer_nx(void)

arch/x86/kvm/vmx/vmx.c

@@ -7248,6 +7248,9 @@ static void vmx_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
 			vmx_set_guest_uret_msr(vmx, msr, enabled ? 0 : TSX_CTRL_RTM_DISABLE);
 		}
 	}
+
+	/* Refresh #PF interception to account for MAXPHYADDR changes. */
+	update_exception_bitmap(vcpu);
 }
 
 static __init void vmx_set_cpu_caps(void)