DM: Add support for virtual TPM enabling

Support TPM enable option when launch UOS.

New option: "--vtpm sock_path=$PATH_OF_SWTPM_SOCKET".
If valid option parsed, then init virtual tpm device.

Tracked-On: #1924
Signed-off-by: Qi Yadong <yadong.qi@intel.com>
Reviewed-by: Zhu Bing <bing.zhu@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>
Acked-by: Yin Fengwei <fengwei.yin@intel.com>

devicemodel/hw/platform/tpm/tpm.c

@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2018 Intel Corporation
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdlib.h>
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdbool.h>
+
+#include "vmmapi.h"
+#include "tpm.h"
+#include "tpm_internal.h"
+
+static int tpm_debug;
+#define LOG_TAG "tpm: "
+#define DPRINTF(fmt, args...) \
+	do { if (tpm_debug) printf(LOG_TAG "%s:" fmt, __func__, ##args); } while (0)
+#define WPRINTF(fmt, args...) \
+	do { printf(LOG_TAG "%s:" fmt, __func__, ##args); } while (0)
+
+#define STR_MAX_LEN 1024U
+static char *sock_path = NULL;
+
+enum {
+	SOCK_PATH_OPT = 0
+};
+
+char *const token[] = {
+	[SOCK_PATH_OPT] = "sock_path",
+	NULL
+};
+
+int acrn_parse_vtpm2(char *arg)
+{
+	char *value;
+	size_t len = strlen(arg);
+
+	if (len > STR_MAX_LEN)
+		return -1;
+
+	if (SOCK_PATH_OPT == getsubopt(&arg, token, &value)) {
+		if (value == NULL) {
+			DPRINTF("Invalid vtpm socket path\n");
+			return -1;
+		}
+		sock_path = calloc(len + 1, 1);
+		if (!sock_path)
+			return -1;
+		strcpy(sock_path, value);
+	}
+
+	return 0;
+}
+
+void init_vtpm2(struct vmctx *ctx)
+{
+	if (!sock_path) {
+		WPRINTF("Invalid socket path!\n");
+		return;
+	}
+
+	if (init_tpm_emulator(sock_path) < 0) {
+		WPRINTF("Failed init tpm emulator!\n");
+		return;
+	}
+
+	if (init_tpm_crb(ctx) < 0) {
+		WPRINTF("Failed init tpm emulator!\n");
+	}
+}
+
+void deinit_vtpm2(struct vmctx *ctx)
+{
+	if (ctx->tpm_dev) {
+		deinit_tpm_crb(ctx);
+
+		deinit_tpm_emulator();
+	}
+}