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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), which
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>
This commit is contained in:
Stefan Berger 2024-10-16 11:21:59 -04:00
parent d2bcaacc17
commit d9280ea317
1 changed files with 1 additions and 1 deletions
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2
tests/qtest/tpm-tests.c
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@ -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));