From dece4f2d875a3964e1d6438dafa108dda8a7a1d0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Corvin=20K=C3=B6hne?= <corvink@FreeBSD.org>
Date: Mon, 15 May 2023 13:24:14 +0200
Subject: [PATCH] bhyve: register TPM device as ACPI device

The TPM device is an ACPI device with some custom ACPI tables.

Reviewed by:		markj
MFC after:		1 week
Sponsored by:		Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D40453
---
 usr.sbin/bhyve/tpm_device.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/usr.sbin/bhyve/tpm_device.c b/usr.sbin/bhyve/tpm_device.c
index 77fd1ccf6a52..56df6ab0e30c 100644
--- a/usr.sbin/bhyve/tpm_device.c
+++ b/usr.sbin/bhyve/tpm_device.c
@@ -13,11 +13,21 @@
 #include <string.h>
 #include <vmmapi.h>
 
+#include "acpi_device.h"
 #include "config.h"
 #include "tpm_device.h"
 
+#define TPM_ACPI_DEVICE_NAME "TPM"
+#define TPM_ACPI_HARDWARE_ID "MSFT0101"
+
 struct tpm_device {
 	struct vmctx *vm_ctx;
+	struct acpi_device *acpi_dev;
+};
+
+static const struct acpi_device_emul tpm_acpi_device_emul = {
+	.name = TPM_ACPI_DEVICE_NAME,
+	.hid = TPM_ACPI_HARDWARE_ID,
 };
 
 void
@@ -26,6 +36,7 @@ tpm_device_destroy(struct tpm_device *const dev)
 	if (dev == NULL)
 		return;
 
+	acpi_device_destroy(dev->acpi_dev);
 	free(dev);
 }
 
@@ -57,6 +68,11 @@ tpm_device_create(struct tpm_device **const new_dev, struct vmctx *const vm_ctx,
 
 	dev->vm_ctx = vm_ctx;
 
+	error = acpi_device_create(&dev->acpi_dev, dev, dev->vm_ctx,
+	    &tpm_acpi_device_emul);
+	if (error)
+		goto err_out;
+
 	*new_dev = dev;
 
 	return (0);