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GET /api/patches/2226176/?format=api
{ "id": 2226176, "url": "http://patchwork.ozlabs.org/api/patches/2226176/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260422103018.123608-10-armenon@redhat.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260422103018.123608-10-armenon@redhat.com>", "list_archive_url": null, "date": "2026-04-22T10:30:17", "name": "[v5,09/10] tpm: Extend TPM TIS buffer size to 8192 bytes", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "d30b3241f1703569bcf26a30b38bb794e6d43c8f", "submitter": { "id": 91136, "url": "http://patchwork.ozlabs.org/api/people/91136/?format=api", "name": "Arun Menon", "email": "armenon@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260422103018.123608-10-armenon@redhat.com/mbox/", "series": [ { "id": 500964, "url": "http://patchwork.ozlabs.org/api/series/500964/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=500964", "date": "2026-04-22T10:30:14", "name": "hw/tpm: CRB chunking capability to handle PQC", "version": 5, "mbox": "http://patchwork.ozlabs.org/series/500964/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2226176/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2226176/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=b99NzYGU;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=google header.b=DNLN0uCW;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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Tsirkin\" <mst@redhat.com>, Yanan Wang <wangyanan55@huawei.com>,\n Ani Sinha <anisinha@redhat.com>, Arun Menon <armenon@redhat.com>,\n Stefan Berger <stefanb@linux.ibm.com>", "Subject": "[PATCH v5 09/10] tpm: Extend TPM TIS buffer size to 8192 bytes", "Date": "Wed, 22 Apr 2026 16:00:17 +0530", "Message-ID": "<20260422103018.123608-10-armenon@redhat.com>", "X-Mailer": "git-send-email 2.53.0", "In-Reply-To": "<20260422103018.123608-1-armenon@redhat.com>", "References": "<20260422103018.123608-1-armenon@redhat.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Received-SPF": "pass client-ip=170.10.133.124; envelope-from=armenon@redhat.com;\n helo=us-smtp-delivery-124.mimecast.com", "X-Spam_score_int": "-20", "X-Spam_score": "-2.1", "X-Spam_bar": "--", "X-Spam_report": "(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_PASS=-0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "From: Stefan Berger <stefanb@linux.ibm.com>\n\nExtend the TIS buffer size to 8192 bytes and store the first 4096 bytes\nusing VMSTATE_PARTIAL_BUFFER and the rest using VMSTATE_BUFFER_START_MIDDLE\nwhen necessary. It is necessary to store the buffer beyond original 4096\nbytes when:\n\n - the user has written more than 4096 bytes to the buffer\n - the TPM 2 response is larger than 4096 bytes\n\nUse the .needed function of the VMStateDescription interface to check\nwhether the bytes in the buffer beyond 4096 bytes needed to be saved.\nThe .pre_save function is called before the .needed function so that we\ncan be sure to have received any response packet from the TPM.\n\nSigned-off-by: Stefan Berger <stefanb@linux.ibm.com>\n[ Arun Menon - Removed WIP tag and TODO for submission ]\nSigned-off-by: Arun Menon <armenon@redhat.com>\n---\n hw/tpm/tpm_tis.h | 2 ++\n hw/tpm/tpm_tis_common.c | 23 +++++++++++++++++++++++\n hw/tpm/tpm_tis_i2c.c | 24 +++++++++++++++++++++++-\n hw/tpm/tpm_tis_isa.c | 24 +++++++++++++++++++++++-\n hw/tpm/tpm_tis_sysbus.c | 24 +++++++++++++++++++++++-\n 5 files changed, 94 insertions(+), 3 deletions(-)", "diff": "diff --git a/hw/tpm/tpm_tis.h b/hw/tpm/tpm_tis.h\nindex 184632ff66..d35c332287 100644\n--- a/hw/tpm/tpm_tis.h\n+++ b/hw/tpm/tpm_tis.h\n@@ -90,4 +90,6 @@ uint32_t tpm_tis_read_data(TPMState *s, hwaddr addr, unsigned size);\n void tpm_tis_write_data(TPMState *s, hwaddr addr, uint64_t val, uint32_t size);\n uint16_t tpm_tis_get_checksum(TPMState *s);\n \n+bool tpm_tis_ext_buffer_migration_needed(struct TPMState *s);\n+\n #endif /* TPM_TPM_TIS_H */\ndiff --git a/hw/tpm/tpm_tis_common.c b/hw/tpm/tpm_tis_common.c\nindex f594b15b8a..dffb0a411e 100644\n--- a/hw/tpm/tpm_tis_common.c\n+++ b/hw/tpm/tpm_tis_common.c\n@@ -890,3 +890,26 @@ const VMStateDescription vmstate_locty = {\n }\n };\n \n+bool tpm_tis_ext_buffer_migration_needed(struct TPMState *s)\n+{\n+ if (!TPM_TIS_IS_VALID_LOCTY(s->active_locty)) {\n+ return false;\n+ }\n+\n+ switch (s->loc[s->active_locty].state) {\n+ case TPM_TIS_STATE_IDLE:\n+ case TPM_TIS_STATE_READY:\n+ return false;\n+ case TPM_TIS_STATE_RECEPTION:\n+ return s->rw_offset >= 4096;\n+ case TPM_TIS_STATE_EXECUTION:\n+ /*\n+ * TPM is executing: we cannot know the size of TPM response.\n+ * .pre_save must have been called before (should never get here).\n+ */\n+ return false;\n+ case TPM_TIS_STATE_COMPLETION:\n+ return (tpm_cmd_get_size(&s->buffer) >= 4096);\n+ }\n+ return false;\n+}\ndiff --git a/hw/tpm/tpm_tis_i2c.c b/hw/tpm/tpm_tis_i2c.c\nindex 9f13e0ec12..a01df7e5a0 100644\n--- a/hw/tpm/tpm_tis_i2c.c\n+++ b/hw/tpm/tpm_tis_i2c.c\n@@ -110,13 +110,31 @@ static int tpm_tis_i2c_post_load(void *opaque, int version_id)\n return 0;\n }\n \n+static bool tpm_tis_ext_buffer_migration_needed_i2c(void *opaque)\n+{\n+ TPMStateI2C *i2cst = opaque;\n+\n+ return tpm_tis_ext_buffer_migration_needed(&i2cst->state);\n+}\n+\n+static const VMStateDescription vmstate_tpm_tis_ext_buffer_i2c = {\n+ .name = \"tpm-tis/ext_buffer\",\n+ .version_id = 0,\n+ .needed = tpm_tis_ext_buffer_migration_needed_i2c,\n+ .pre_save = tpm_tis_i2c_pre_save,\n+ .fields = (const VMStateField[]) {\n+ VMSTATE_BUFFER_START_MIDDLE(state.buffer, TPMStateI2C, 4096),\n+ VMSTATE_END_OF_LIST()\n+ }\n+};\n+\n static const VMStateDescription vmstate_tpm_tis_i2c = {\n .name = \"tpm-tis-i2c\",\n .version_id = 0,\n .pre_save = tpm_tis_i2c_pre_save,\n .post_load = tpm_tis_i2c_post_load,\n .fields = (const VMStateField[]) {\n- VMSTATE_BUFFER(state.buffer, TPMStateI2C),\n+ VMSTATE_PARTIAL_BUFFER(state.buffer, TPMStateI2C, 4096),\n VMSTATE_UINT16(state.rw_offset, TPMStateI2C),\n VMSTATE_UINT8(state.active_locty, TPMStateI2C),\n VMSTATE_UINT8(state.aborting_locty, TPMStateI2C),\n@@ -133,6 +151,10 @@ static const VMStateDescription vmstate_tpm_tis_i2c = {\n VMSTATE_UINT8(csum_enable, TPMStateI2C),\n \n VMSTATE_END_OF_LIST()\n+ },\n+ .subsections = (const VMStateDescription *const[]) {\n+ &vmstate_tpm_tis_ext_buffer_i2c,\n+ NULL,\n }\n };\n \ndiff --git a/hw/tpm/tpm_tis_isa.c b/hw/tpm/tpm_tis_isa.c\nindex 61e95434f5..73038f1a10 100644\n--- a/hw/tpm/tpm_tis_isa.c\n+++ b/hw/tpm/tpm_tis_isa.c\n@@ -49,12 +49,30 @@ static int tpm_tis_pre_save_isa(void *opaque)\n return tpm_tis_pre_save(&isadev->state);\n }\n \n+static bool tpm_tis_ext_buffer_migration_needed_isa(void *opaque)\n+{\n+ TPMStateISA *isadev = opaque;\n+\n+ return tpm_tis_ext_buffer_migration_needed(&isadev->state);\n+}\n+\n+static const VMStateDescription vmstate_tpm_tis_ext_buffer_isa = {\n+ .name = \"tpm-tis/ext_buffer\",\n+ .version_id = 0,\n+ .needed = tpm_tis_ext_buffer_migration_needed_isa,\n+ .pre_save = tpm_tis_pre_save_isa,\n+ .fields = (const VMStateField[]) {\n+ VMSTATE_BUFFER_START_MIDDLE(state.buffer, TPMStateISA, 4096),\n+ VMSTATE_END_OF_LIST()\n+ }\n+};\n+\n static const VMStateDescription vmstate_tpm_tis_isa = {\n .name = \"tpm-tis\",\n .version_id = 0,\n .pre_save = tpm_tis_pre_save_isa,\n .fields = (const VMStateField[]) {\n- VMSTATE_BUFFER(state.buffer, TPMStateISA),\n+ VMSTATE_PARTIAL_BUFFER(state.buffer, TPMStateISA, 4096),\n VMSTATE_UINT16(state.rw_offset, TPMStateISA),\n VMSTATE_UINT8(state.active_locty, TPMStateISA),\n VMSTATE_UINT8(state.aborting_locty, TPMStateISA),\n@@ -64,6 +82,10 @@ static const VMStateDescription vmstate_tpm_tis_isa = {\n vmstate_locty, TPMLocality),\n \n VMSTATE_END_OF_LIST()\n+ },\n+ .subsections = (const VMStateDescription *const[]) {\n+ &vmstate_tpm_tis_ext_buffer_isa,\n+ NULL,\n }\n };\n \ndiff --git a/hw/tpm/tpm_tis_sysbus.c b/hw/tpm/tpm_tis_sysbus.c\nindex e9372e7316..86fc5a592c 100644\n--- a/hw/tpm/tpm_tis_sysbus.c\n+++ b/hw/tpm/tpm_tis_sysbus.c\n@@ -48,12 +48,30 @@ static int tpm_tis_pre_save_sysbus(void *opaque)\n return tpm_tis_pre_save(&sbdev->state);\n }\n \n+static bool tpm_tis_ext_buffer_migration_needed_sysbus(void *opaque)\n+{\n+ TPMStateSysBus *sbdev = opaque;\n+\n+ return tpm_tis_ext_buffer_migration_needed(&sbdev->state);\n+}\n+\n+static const VMStateDescription vmstate_tpm_tis_ext_buffer_sysbus = {\n+ .name = \"tpm-tis/ext_buffer\",\n+ .version_id = 0,\n+ .needed = tpm_tis_ext_buffer_migration_needed_sysbus,\n+ .pre_save = tpm_tis_pre_save_sysbus,\n+ .fields = (const VMStateField[]) {\n+ VMSTATE_BUFFER_START_MIDDLE(state.buffer, TPMStateSysBus, 4096),\n+ VMSTATE_END_OF_LIST()\n+ }\n+};\n+\n static const VMStateDescription vmstate_tpm_tis_sysbus = {\n .name = \"tpm-tis\",\n .version_id = 0,\n .pre_save = tpm_tis_pre_save_sysbus,\n .fields = (const VMStateField[]) {\n- VMSTATE_BUFFER(state.buffer, TPMStateSysBus),\n+ VMSTATE_PARTIAL_BUFFER(state.buffer, TPMStateSysBus, 4096),\n VMSTATE_UINT16(state.rw_offset, TPMStateSysBus),\n VMSTATE_UINT8(state.active_locty, TPMStateSysBus),\n VMSTATE_UINT8(state.aborting_locty, TPMStateSysBus),\n@@ -63,6 +81,10 @@ static const VMStateDescription vmstate_tpm_tis_sysbus = {\n 0, vmstate_locty, TPMLocality),\n \n VMSTATE_END_OF_LIST()\n+ },\n+ .subsections = (const VMStateDescription *const[]) {\n+ &vmstate_tpm_tis_ext_buffer_sysbus,\n+ NULL,\n }\n };\n \n", "prefixes": [ "v5", "09/10" ] }