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 the TIS and TPM 1.2 so far, but it also seems to work with TPM 2.
The TIS is simplified first by reducing the number of buffers and read and write offsets into these buffers. Following the state machine of the TIS, a single buffer and r/w offset is enough for all localities since only one locality can ever be active. This series applies on top of my tpm-next branch. 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 (13): tpm_tis: convert uint32_t to size_t tpm_tis: limit size of buffer from backend tpm_tis: remove TPMSizeBuffer usage tpm_tis: move buffers from localities into common location tpm_tis: merge read and write buffer into single buffer tpm_tis: move r/w_offsets to TPMState tpm_tis: merge r/w_offset into rw_offset tpm: Implement tpm_sized_buffer_reset 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: extend TPM emulator with state migration support tpm_tis: extend TPM TIS with state migration support backends/tpm.c | 29 +++++ hw/tpm/tpm_emulator.c | 303 +++++++++++++++++++++++++++++++++++++++++-- hw/tpm/tpm_tis.c | 216 +++++++++++++++++------------- hw/tpm/tpm_util.c | 7 + hw/tpm/tpm_util.h | 7 + include/sysemu/tpm_backend.h | 22 ++++ 6 files changed, 483 insertions(+), 101 deletions(-) -- 2.5.5
