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tpm: extend TPM TIS with state migration support

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Extend the TPM TIS interface with state migration support.

We need to synchronize with the backend thread to make sure that a command
being processed by the external TPM emulator has completed and its
response been received.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
This commit is contained in:
Stefan Berger 2017-10-11 10:36:53 -04:00
parent 38ab74e7ca
commit 9ec08c485e
2 changed files with 51 additions and 2 deletions
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52
hw/tpm/tpm_tis.c
View File

@ -894,9 +894,57 @@ static void tpm_tis_reset(DeviceState *dev)
tpm_backend_startup_tpm(s->be_driver, s->be_buffer_size);
}
/* persistent state handling */
static int tpm_tis_pre_save(void *opaque)
{
TPMState *s = opaque;
uint8_t locty = s->active_locty;
trace_tpm_tis_pre_save(locty, s->rw_offset);
if (DEBUG_TIS) {
tpm_tis_dump_state(opaque, 0);
}
/*
* Synchronize with backend completion.
*/
tpm_backend_finish_sync(s->be_driver);
return 0;
}
static const VMStateDescription vmstate_locty = {
.name = "tpm-tis/locty",
.version_id = 0,
.fields = (VMStateField[]) {
VMSTATE_UINT32(state, TPMLocality),
VMSTATE_UINT32(inte, TPMLocality),
VMSTATE_UINT32(ints, TPMLocality),
VMSTATE_UINT8(access, TPMLocality),
VMSTATE_UINT32(sts, TPMLocality),
VMSTATE_UINT32(iface_id, TPMLocality),
VMSTATE_END_OF_LIST(),
}
};
static const VMStateDescription vmstate_tpm_tis = {
.name = "tpm",
.unmigratable = 1,
.name = "tpm-tis",
.version_id = 0,
.pre_save = tpm_tis_pre_save,
.fields = (VMStateField[]) {
VMSTATE_BUFFER(buffer, TPMState),
VMSTATE_UINT16(rw_offset, TPMState),
VMSTATE_UINT8(active_locty, TPMState),
VMSTATE_UINT8(aborting_locty, TPMState),
VMSTATE_UINT8(next_locty, TPMState),
VMSTATE_STRUCT_ARRAY(loc, TPMState, TPM_TIS_NUM_LOCALITIES, 0,
vmstate_locty, TPMLocality),
VMSTATE_END_OF_LIST()
}
};
static Property tpm_tis_properties[] = {

1
hw/tpm/trace-events
View File

@ -50,3 +50,4 @@ tpm_tis_mmio_write_locty_seized(uint8_t locty, uint8_t active) "Locality %d seiz
tpm_tis_mmio_write_init_abort(void) "Initiating abort"
tpm_tis_mmio_write_lowering_irq(void) "Lowering IRQ"
tpm_tis_mmio_write_data2send(uint32_t value, unsigned size) "Data to send to TPM: 0x%08x (size=%d)"
tpm_tis_pre_save(uint8_t locty, uint32_t rw_offset) "locty: %d, rw_offset = %u"