diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index d04f0a0383f3..fa2eb4fdc4b4 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8115,8 +8115,6 @@ struct read_write_emulator_ops {
 				  void *val, int bytes);
 	int (*read_write_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa,
 			       int bytes, void *val);
-	int (*read_write_exit_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa,
-				    void *val, int bytes);
 	bool write;
 };
 
@@ -8138,31 +8136,14 @@ static int write_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes, void *val)
 	return vcpu_mmio_write(vcpu, gpa, bytes, val);
 }
 
-static int read_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa,
-			  void *val, int bytes)
-{
-	return X86EMUL_IO_NEEDED;
-}
-
-static int write_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa,
-			   void *val, int bytes)
-{
-	struct kvm_mmio_fragment *frag = &vcpu->mmio_fragments[0];
-
-	memcpy(vcpu->run->mmio.data, frag->data, min(8u, frag->len));
-	return X86EMUL_CONTINUE;
-}
-
 static const struct read_write_emulator_ops read_emultor = {
 	.read_write_emulate = read_emulate,
 	.read_write_mmio = vcpu_mmio_read,
-	.read_write_exit_mmio = read_exit_mmio,
 };
 
 static const struct read_write_emulator_ops write_emultor = {
 	.read_write_emulate = write_emulate,
 	.read_write_mmio = write_mmio,
-	.read_write_exit_mmio = write_exit_mmio,
 	.write = true,
 };
 
@@ -8295,7 +8276,19 @@ static int emulator_read_write(struct x86_emulate_ctxt *ctxt,
 	vcpu->run->exit_reason = KVM_EXIT_MMIO;
 	vcpu->run->mmio.phys_addr = frag->gpa;
 
-	return ops->read_write_exit_mmio(vcpu, frag->gpa, val, bytes);
+	/*
+	 * For MMIO reads, stop emulating and immediately exit to userspace, as
+	 * KVM needs the value to correctly emulate the instruction.  For MMIO
+	 * writes, continue emulating as the write to MMIO is a side effect for
+	 * all intents and purposes.  KVM will still exit to userspace, but
+	 * after completing emulation (see the check on vcpu->mmio_needed in
+	 * x86_emulate_instruction()).
+	 */
+	if (!ops->write)
+		return X86EMUL_IO_NEEDED;
+
+	memcpy(vcpu->run->mmio.data, frag->data, min(8u, frag->len));
+	return X86EMUL_CONTINUE;
 }
 
 static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt,