D40460.diff
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	diff --git a/usr.sbin/bhyve/tpm_emul_passthru.c b/usr.sbin/bhyve/tpm_emul_passthru.c
	--- a/usr.sbin/bhyve/tpm_emul_passthru.c
	+++ b/usr.sbin/bhyve/tpm_emul_passthru.c
	@@ -22,6 +22,12 @@
	int fd;
	};

	+struct tpm_resp_hdr {
	+ uint16_t tag;
	+ uint32_t len;
	+ uint32_t errcode;
	+} __packed;
	+
	static int
	tpm_passthru_init(void *sc, nvlist_t nvl)
	{
	@@ -46,6 +52,37 @@
	return (0);
	}

	+static int
	+tpm_passthru_execute_cmd(void sc, void cmd, uint32_t cmd_size, void *rsp,
	+ uint32_t rsp_size)
	+{
	+ struct tpm_passthru *tpm;
	+ ssize_t len;
	+
	+ if (rsp_size < (ssize_t)sizeof(struct tpm_resp_hdr)) {
	+ warn("%s: rsp_size of %u is too small", __func__, rsp_size);
	+ return (EINVAL);
	+ }
	+
	+ tpm = sc;
	+
	+ len = write(tpm->fd, cmd, cmd_size);
	+ if (len != cmd_size) {
	+ warn("%s: cmd write failed (bytes written: %zd / %d)", __func__,
	+ len, cmd_size);
	+ return (EFAULT);
	+ }
	+
	+ len = read(tpm->fd, rsp, rsp_size);
	+ if (len < (ssize_t)sizeof(struct tpm_resp_hdr)) {
	+ warn("%s: rsp read failed (bytes read: %zd / %d)", __func__,
	+ len, rsp_size);
	+ return (EFAULT);
	+ }
	+
	+ return (0);
	+}
	+
	static void
	tpm_passthru_deinit(void *sc)
	{
	@@ -65,5 +102,6 @@
	.name = "passthru",
	.init = tpm_passthru_init,
	.deinit = tpm_passthru_deinit,
	+ .execute_cmd = tpm_passthru_execute_cmd,
	};
	TPM_EMUL_SET(tpm_emul_passthru);