This set of patches implements support for migrating the state of the external 'swtpm' TPM emulator as well as that of the emulated device interfaces. I have primarily tested this with TPM 1.2 so far, but it also seems to work with TPM 2 and the CRB interface.
This series applies on top of Marc-Andre's patch set with all 42 patches applied (21 of them have been applied). One of the challenges that is addressed by this set of patches is the fact that the TPM emulator may be processing a command while the state serialization of the devices is supposed to happen. A necessary first step has been implemented here that ensures that a response has been received from the exernal emulator and the bottom half function, which delivers the response and adjusts device registers (TIS or CRB), has been executed, before the device's state is serialized. A subsequent extension may need to address the live migration loop and delay the serialization of devices until the response from the external TPM has been received. Though the likelihood that someone executes a long-lasting TPM command while this is occurring is certainly rare. Stefan Stefan Berger (7): tpm: Introduce condition to notify waiters of completed command tpm: Introduce condition in TPM backend for notification tpm: implement tpm_backend_wait_cmd_completed tpm: Implement tpm_sized_buffer_reset tpm: extend TPM emulator with state migration support tpm: extend TPM TIS with state migration support tpm: extend TPM CRB with state migration support backends/tpm.c | 29 ++++ hw/tpm/tpm_crb.c | 73 +++++++++- hw/tpm/tpm_emulator.c | 309 +++++++++++++++++++++++++++++++++++++++++-- hw/tpm/tpm_tis.c | 151 +++++++++++++++++++-- hw/tpm/tpm_util.c | 7 + hw/tpm/tpm_util.h | 7 + include/sysemu/tpm_backend.h | 22 +++ 7 files changed, 572 insertions(+), 26 deletions(-) -- 2.5.5
