From 8d0819346db8943b519ea7685569382c56776d15 Mon Sep 17 00:00:00 2001
From: NIIBE Yutaka <gniibe@fsij.org>
Date: Thu, 28 Sep 2023 13:26:52 +0900
Subject: [PATCH] tpm2d: Check SWTPM environment variable for swtpm support.

* tpm2d/intel-tss.h (TSS_Create): Check SWTPM.

--

Cherry-picked from master commit of:
	1da40db03eba4aa056f7cdf8ef90292272a4147d

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
---
 tpm2d/intel-tss.h | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/tpm2d/intel-tss.h b/tpm2d/intel-tss.h
index 615f81e2f..53da5cee2 100644
--- a/tpm2d/intel-tss.h
+++ b/tpm2d/intel-tss.h
@@ -285,9 +285,15 @@ TSS_Create(TSS_CONTEXT **tssContext)
    */
   if (intType)
     {
-      if (strcmp("socsim", intType) == 0) {
-	tctildr = "mssim";
-      }
+      if (strcmp("socsim", intType) == 0)
+	{
+	  char *swtpm = getenv("SWTPM");
+
+	  if (!swtpm || strlen(swtpm) == 0)
+	    tctildr = "mssim";
+	  else
+	    tctildr = "swtpm";
+	}
       else if (strcmp("dev", intType) == 0)
 	{
 	  tctildr = "device";