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diff --git a/usr.sbin/bhyve/Makefile b/usr.sbin/bhyve/Makefile
--- a/usr.sbin/bhyve/Makefile
+++ b/usr.sbin/bhyve/Makefile
@@ -76,6 +76,7 @@
spinup_ap.c \
task_switch.c \
tpm_device.c \
+ tpm_emul_passthru.c \
uart_emul.c \
usb_emul.c \
usb_mouse.c \
diff --git a/usr.sbin/bhyve/tpm_emul_passthru.c b/usr.sbin/bhyve/tpm_emul_passthru.c
new file mode 100644
--- /dev/null
+++ b/usr.sbin/bhyve/tpm_emul_passthru.c
@@ -0,0 +1,69 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2023 Beckhoff Automation GmbH & Co. KG
+ * Author: Corvin Köhne <corvink@FreeBSD.org>
+ */
+
+#include <sys/types.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <malloc_np.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "config.h"
+#include "tpm_device.h"
+#include "tpm_emul.h"
+
+struct tpm_passthru {
+ int fd;
+};
+
+static int
+tpm_passthru_init(void **sc, nvlist_t *nvl)
+{
+ struct tpm_passthru *tpm;
+ const char *path;
+
+ tpm = calloc(1, sizeof(struct tpm_passthru));
+ if (tpm == NULL) {
+ warnx("%s: failed to allocate tpm passthru", __func__);
+ return (ENOMEM);
+ }
+
+ path = get_config_value_node(nvl, "path");
+ tpm->fd = open(path, O_RDWR);
+ if (tpm->fd < 0) {
+ warnx("%s: unable to open tpm device \"%s\"", __func__, path);
+ return (ENOENT);
+ }
+
+ *sc = tpm;
+
+ return (0);
+}
+
+static void
+tpm_passthru_deinit(void *sc)
+{
+ struct tpm_passthru *tpm;
+
+ tpm = sc;
+ if (tpm == NULL)
+ return;
+
+ if (tpm->fd >= 0)
+ close(tpm->fd);
+
+ free(tpm);
+}
+
+static const struct tpm_emul tpm_emul_passthru = {
+ .name = "passthru",
+ .init = tpm_passthru_init,
+ .deinit = tpm_passthru_deinit,
+};
+TPM_EMUL_SET(tpm_emul_passthru);

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