KVM: MIPS: Update exit handler for VZ

The general guest exit handler needs a few tweaks for VZ compared to
trap & emulate, which for now are made directly depending on
CONFIG_KVM_MIPS_VZ:

- There is no need to re-enable the hardware page table walker (HTW), as
  it can be left enabled during guest mode operation with VZ.

- There is no need to perform a privilege check, as any guest privilege
  violations should have already been detected by the hardware and
  triggered the appropriate guest exception.
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org

arch/mips/kvm/mips.c

@@ -1230,6 +1230,7 @@ int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
 	vcpu->mode = OUTSIDE_GUEST_MODE;
 
 	/* re-enable HTW before enabling interrupts */
+	if (!IS_ENABLED(CONFIG_KVM_MIPS_VZ))
 		htw_start();
 
 	/* Set a default exit reason */
@@ -1248,9 +1249,11 @@ int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
 			cause, opc, run, vcpu);
 	trace_kvm_exit(vcpu, exccode);
 
+	if (!IS_ENABLED(CONFIG_KVM_MIPS_VZ)) {
 		/*
-	 * Do a privilege check, if in UM most of these exit conditions end up
-	 * causing an exception to be delivered to the Guest Kernel
+		 * Do a privilege check, if in UM most of these exit conditions
+		 * end up causing an exception to be delivered to the Guest
+		 * Kernel
 		 */
 		er = kvm_mips_check_privilege(cause, opc, run, vcpu);
 		if (er == EMULATE_PRIV_FAIL) {
@@ -1260,6 +1263,7 @@ int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
 			ret = RESUME_HOST;
 			goto skip_emul;
 		}
+	}
 
 	switch (exccode) {
 	case EXCCODE_INT:
@@ -1418,6 +1422,7 @@ int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
 	}
 
 	/* Disable HTW before returning to guest or host */
+	if (!IS_ENABLED(CONFIG_KVM_MIPS_VZ))
 		htw_stop();
 
 	return ret;