From c4d618ea0dc507084d9c1e2b61e58691a73c2cf4 Mon Sep 17 00:00:00 2001
From: Susanooo <zhangchujun_yewu@cmss.chinamobile.com>
Date: Thu, 24 Oct 2024 10:10:34 +0800
Subject: [PATCH] tests: Wait for migration completion on destination QEMU to
 avoid failures
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Rather than waiting for the completion of migration on the source side,
wait for it on the destination QEMU side to avoid accessing the TPM TIS
memory mapped registers before QEMU could restore their state. This
error condition could be triggered on busy systems where the destination
QEMU did not have enough time to restore the TIS state while the test case
was already reading its registers. The test case was for example reading
the STS register and received an unexpected value (0xffffffff), whic
lead to a segmentation fault later on due to trying to read 0xffff bytes
from the TIS into a buffer.

Cc:  <qemu-stable@nongnu.org>
Reported-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: zhangchujun <zhangchujun_yewu@cmss.chinamobile.com>
---
 tests/qtest/tpm-tests.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/qtest/tpm-tests.c b/tests/qtest/tpm-tests.c
index fb94496bbd..197714f8d9 100644
--- a/tests/qtest/tpm-tests.c
+++ b/tests/qtest/tpm-tests.c
@@ -114,7 +114,7 @@ void tpm_test_swtpm_migration_test(const char *src_tpm_path,
                      sizeof(tpm_pcrread_resp));
 
     tpm_util_migrate(src_qemu, uri);
-    tpm_util_wait_for_migration_complete(src_qemu);
+    tpm_util_wait_for_migration_complete(dst_qemu);
 
     tpm_util_pcrread(dst_qemu, tx, tpm_pcrread_resp,
                      sizeof(tpm_pcrread_resp));
-- 
2.41.0.windows.1