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Thu, 12 Dec 2019 18:08:27 +0000 (GMT) Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 05400B2067; Thu, 12 Dec 2019 18:08:27 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b01ledav003.gho.pok.ibm.com (Postfix) with ESMTP; Thu, 12 Dec 2019 18:08:26 +0000 (GMT) From: Stefan Berger To: qemu-ppc@nongnu.org Subject: [PATCH v4 6/8] tpm_spapr: Support suspend and resume Date: Thu, 12 Dec 2019 13:07:42 -0500 Message-Id: <20191212180744.1070446-7-stefanb@linux.vnet.ibm.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20191212180744.1070446-1-stefanb@linux.vnet.ibm.com> References: <20191212180744.1070446-1-stefanb@linux.vnet.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,18.0.572 definitions=2019-12-12_05:2019-12-12,2019-12-12 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 mlxlogscore=999 lowpriorityscore=0 priorityscore=1501 impostorscore=0 malwarescore=0 phishscore=0 bulkscore=0 clxscore=1015 adultscore=0 spamscore=0 suspectscore=1 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-1912120140 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.156.1 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: marcandre.lureau@redhat.com, Stefan Berger , qemu-devel@nongnu.org, david@gibson.dropbear.id.au Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" Extend the tpm_spapr frontend with VM suspend and resume support. Signed-off-by: Stefan Berger diff --git a/hw/tpm/tpm_spapr.c b/hw/tpm/tpm_spapr.c index c4a67e2403..52e0405ab4 100644 --- a/hw/tpm/tpm_spapr.c +++ b/hw/tpm/tpm_spapr.c @@ -87,6 +87,8 @@ typedef struct { TPMVersion be_tpm_version; size_t be_buffer_size; + + bool deliver_response; /* whether to deliver response after VM resume */ } SPAPRvTPMState; static void tpm_spapr_show_buffer(const unsigned char *buffer, @@ -255,6 +257,14 @@ static void tpm_spapr_request_completed(TPMIf *ti, int ret) TPMSpaprCRQ *crq = &s->crq; uint32_t len; int rc; + bool be_suspended; + + be_suspended = tpm_backend_is_suspended(s->be_driver); + if (be_suspended) { + /* defer delivery of response until .post_load */ + s->deliver_response |= true; + return; + } s->state = SPAPR_VTPM_STATE_COMPLETION; @@ -316,6 +326,7 @@ static void tpm_spapr_reset(SpaprVioDevice *dev) SPAPRvTPMState *s = VIO_SPAPR_VTPM(dev); s->state = SPAPR_VTPM_STATE_NONE; + s->deliver_response = false; s->be_tpm_version = tpm_backend_get_tpm_version(s->be_driver); tpm_spapr_update_deviceclass(dev); @@ -339,9 +350,53 @@ 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) +{ + SPAPRvTPMState *s = opaque; + + s->deliver_response |= tpm_backend_finish_sync(s->be_driver); + + trace_tpm_spapr_pre_save(s->deliver_response); + /* + * 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) +{ + SPAPRvTPMState *s = opaque; + + if (s->deliver_response) { + trace_tpm_spapr_post_load(); + /* deliver the results to the VM via DMA */ + tpm_spapr_request_completed(TPM_IF(s), 0); + s->deliver_response = false; + } + + return 0; +} + static const VMStateDescription vmstate_spapr_vtpm = { .name = "tpm-spapr", - .unmigratable = 1, + .version_id = 1, + .minimum_version_id = 0, + .minimum_version_id_old = 0, + .pre_save = tpm_spapr_pre_save, + .post_load = tpm_spapr_post_load, + .fields = (VMStateField[]) { + VMSTATE_SPAPR_VIO(vdev, SPAPRvTPMState), + + VMSTATE_UINT8(state, SPAPRvTPMState), + VMSTATE_BUFFER(buffer, SPAPRvTPMState), + /* remember DMA address */ + VMSTATE_UINT32(crq.s.data, SPAPRvTPMState), + VMSTATE_BOOL(deliver_response, SPAPRvTPMState), + VMSTATE_END_OF_LIST(), + } }; static Property tpm_spapr_properties[] = { diff --git a/hw/tpm/trace-events b/hw/tpm/trace-events index 6278a39618..d109661b96 100644 --- a/hw/tpm/trace-events +++ b/hw/tpm/trace-events @@ -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_pre_save(bool v) "TPM response to deliver after resume: %d" +tpm_spapr_post_load(void) "Delivering TPM response after resume"