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tpm_spapr: Support suspend and resume

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Extend the tpm_spapr frontend with VM suspend and resume support.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Message-Id: <20200121152935.649898-5-stefanb@linux.ibm.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Stefan Berger 2020-01-21 10:29:33 -05:00 committed by David Gibson
parent 3676bc69b3
commit ee9a8129d3
2 changed files with 53 additions and 1 deletions
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52
hw/tpm/tpm_spapr.c
View File

@ -76,6 +76,8 @@ typedef struct {
unsigned char *buffer;
uint32_t numbytes; /* number of bytes to deliver on resume */
TPMBackendCmd cmd;
TPMBackend *be_driver;
@ -240,6 +242,14 @@ static void tpm_spapr_request_completed(TPMIf *ti, int ret)
/* a max. of be_buffer_size bytes can be transported */
len = MIN(tpm_cmd_get_size(s->buffer), s->be_buffer_size);
if (runstate_check(RUN_STATE_FINISH_MIGRATE)) {
trace_tpm_spapr_caught_response(len);
/* defer delivery of response until .post_load */
s->numbytes = len;
return;
}
rc = spapr_vio_dma_write(&s->vdev, be32_to_cpu(crq->data),
s->buffer, len);
@ -288,6 +298,7 @@ static void tpm_spapr_reset(SpaprVioDevice *dev)
SpaprTpmState *s = VIO_SPAPR_VTPM(dev);
s->state = SPAPR_VTPM_STATE_NONE;
s->numbytes = 0;
s->be_tpm_version = tpm_backend_get_tpm_version(s->be_driver);
@ -309,9 +320,48 @@ static enum TPMVersion tpm_spapr_get_version(TPMIf *ti)
return tpm_backend_get_tpm_version(s->be_driver);
}
/* persistent state handling */
static int tpm_spapr_pre_save(void *opaque)
{
SpaprTpmState *s = opaque;
tpm_backend_finish_sync(s->be_driver);
/*
* we cannot deliver the results to the VM since DMA would touch VM memory
*/
return 0;
}
static int tpm_spapr_post_load(void *opaque, int version_id)
{
SpaprTpmState *s = opaque;
if (s->numbytes) {
trace_tpm_spapr_post_load();
/* deliver the results to the VM via DMA */
tpm_spapr_request_completed(TPM_IF(s), 0);
s->numbytes = 0;
}
return 0;
}
static const VMStateDescription vmstate_spapr_vtpm = {
.name = "tpm-spapr",
.unmigratable = 1,
.pre_save = tpm_spapr_pre_save,
.post_load = tpm_spapr_post_load,
.fields = (VMStateField[]) {
VMSTATE_SPAPR_VIO(vdev, SpaprTpmState),
VMSTATE_UINT8(state, SpaprTpmState),
VMSTATE_UINT32(numbytes, SpaprTpmState),
VMSTATE_VBUFFER_UINT32(buffer, SpaprTpmState, 0, NULL, numbytes),
/* remember DMA address */
VMSTATE_UINT32(crq.data, SpaprTpmState),
VMSTATE_END_OF_LIST(),
}
};
static Property tpm_spapr_properties[] = {

2
hw/tpm/trace-events
View File

@ -67,3 +67,5 @@ tpm_spapr_do_crq_get_version(uint32_t version) "response: version %u"
tpm_spapr_do_crq_prepare_to_suspend(void) "response: preparing to suspend"
tpm_spapr_do_crq_unknown_msg_type(uint8_t type) "Unknown message type 0x%02x"
tpm_spapr_do_crq_unknown_crq(uint8_t raw1, uint8_t raw2) "unknown CRQ 0x%02x 0x%02x ..."
tpm_spapr_post_load(void) "Delivering TPM response after resume"
tpm_spapr_caught_response(uint32_t v) "Caught response to deliver after resume: %u bytes"