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tpm_emulator: Avoid double initialization during migration 

When resuming after a migration, the backend sends CMD_INIT to the
emulator from the startup callback, then it sends the migration state
from the vmstate to the emulator, then it sends CMD_INIT again. Skip the
first CMD_INIT during a migration to avoid initializing the TPM twice.

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Tested-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
This commit is contained in:
Ross Lagerwall 2022-08-01 15:25:25 +01:00 committed by Stefan Berger
parent 79dfa177ae
commit a0bcec0376
1 changed files with 10 additions and 0 deletions
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10
backends/tpm/tpm_emulator.c
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@ -32,6 +32,7 @@
#include "qemu/sockets.h"
#include "qemu/lockable.h"
#include "io/channel-socket.h"
#include "sysemu/runstate.h"
#include "sysemu/tpm_backend.h"
#include "sysemu/tpm_util.h"
#include "tpm_int.h"
@ -383,6 +384,15 @@ err_exit:
static int tpm_emulator_startup_tpm(TPMBackend *tb, size_t buffersize)
{
/* TPM startup will be done from post_load hook */
if (runstate_check(RUN_STATE_INMIGRATE)) {
if (buffersize != 0) {
return tpm_emulator_set_buffer_size(tb, buffersize, NULL);
}
return 0;
}
return tpm_emulator_startup_tpm_resume(tb, buffersize, false);
}