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bhyve: add basic TPM emulation struct

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This struct will be used to implement various TPM emulations like a TPM
passthrough or a virtual TPM.

Reviewed by:		markj
MFC after:		1 week
Sponsored by:		Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D40454
This commit is contained in:
Corvin Köhne 2023-05-15 13:49:42 +02:00
parent b3564c2337
commit e097785758
No known key found for this signature in database
GPG Key ID: D854DA56315E026A
2 changed files with 51 additions and 0 deletions
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29
usr.sbin/bhyve/tpm_device.c
View File

@ -17,13 +17,18 @@
#include "acpi_device.h"
#include "config.h"
#include "tpm_device.h"
#include "tpm_emul.h"
#define TPM_ACPI_DEVICE_NAME "TPM"
#define TPM_ACPI_HARDWARE_ID "MSFT0101"
SET_DECLARE(tpm_emul_set, struct tpm_emul);
struct tpm_device {
struct vmctx *vm_ctx;
struct acpi_device *acpi_dev;
struct tpm_emul *emul;
void *emul_sc;
};
static const struct acpi_device_emul tpm_acpi_device_emul = {
@ -37,6 +42,9 @@ tpm_device_destroy(struct tpm_device *const dev)
if (dev == NULL)
return;
if (dev->emul != NULL && dev->emul->deinit != NULL)
dev->emul->deinit(dev->emul_sc);
acpi_device_destroy(dev->acpi_dev);
free(dev);
}
@ -46,6 +54,7 @@ tpm_device_create(struct tpm_device **const new_dev, struct vmctx *const vm_ctx,
nvlist_t *const nvl)
{
struct tpm_device *dev = NULL;
struct tpm_emul **ppemul;
const char *value;
int error;
@ -75,6 +84,26 @@ tpm_device_create(struct tpm_device **const new_dev, struct vmctx *const vm_ctx,
if (error)
goto err_out;
value = get_config_value_node(nvl, "type");
assert(value != NULL);
SET_FOREACH(ppemul, tpm_emul_set) {
if (strcmp(value, (*ppemul)->name))
continue;
dev->emul = *ppemul;
break;
}
if (dev->emul == NULL) {
warnx("TPM emulation \"%s\" not found", value);
error = EINVAL;
goto err_out;
}
if (dev->emul->init) {
error = dev->emul->init(&dev->emul_sc, nvl);
if (error)
goto err_out;
}
*new_dev = dev;
return (0);

22
usr.sbin/bhyve/tpm_emul.h Normal file
View File

@ -0,0 +1,22 @@
/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2023 Beckhoff Automation GmbH & Co. KG
* Author: Corvin Köhne <corvink@FreeBSD.org>
*/
#pragma once
#include <sys/linker_set.h>
#include "config.h"
struct tpm_device;
struct tpm_emul {
const char *name;
int (*init)(void **sc, nvlist_t *nvl);
void (*deinit)(void *sc);
};
#define TPM_EMUL_SET(x) DATA_SET(tpm_emul_set, x)