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GET /api/1.1/patches/2220146/?format=api
{ "id": 2220146, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2220146/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260406141735.25844-7-armenon@redhat.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.1/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": "" }, "msgid": "<20260406141735.25844-7-armenon@redhat.com>", "date": "2026-04-06T14:17:31", "name": "[v3,06/10] hw/tpm: Add support for VM migration with TPM CRB chunking", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "2aae75cea9cae9a06d0d943ca36b0bda5dc7f5f3", "submitter": { "id": 91136, "url": "http://patchwork.ozlabs.org/api/1.1/people/91136/?format=api", "name": "Arun Menon", "email": "armenon@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260406141735.25844-7-armenon@redhat.com/mbox/", "series": [ { "id": 498860, "url": "http://patchwork.ozlabs.org/api/1.1/series/498860/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=498860", "date": "2026-04-06T14:17:28", "name": "hw/tpm: CRB chunking capability to handle PQC", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/498860/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2220146/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2220146/checks/", "tags": {}, "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=hzUIvVjw;\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=gqTwhPRK;\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>,\n Yanan Wang <wangyanan55@huawei.com>, Igor Mammedov <imammedo@redhat.com>,\n\t=?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= <philmd@linaro.org>,\n Arun Menon <armenon@redhat.com>", "Subject": "[PATCH v3 06/10] hw/tpm: Add support for VM migration with TPM CRB\n chunking", "Date": "Mon, 6 Apr 2026 19:47:31 +0530", "Message-ID": "<20260406141735.25844-7-armenon@redhat.com>", "X-Mailer": "git-send-email 2.53.0", "In-Reply-To": "<20260406141735.25844-1-armenon@redhat.com>", "References": "<20260406141735.25844-1-armenon@redhat.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Received-SPF": "pass client-ip=170.10.129.124; envelope-from=armenon@redhat.com;\n helo=us-smtp-delivery-124.mimecast.com", "X-Spam_score_int": "-25", "X-Spam_score": "-2.6", "X-Spam_bar": "--", "X-Spam_report": "(-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.54,\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, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n SPF_HELO_PASS=-0.001, 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: Arun Menon <armenon@redhat.com>\n\n- Add subsection in VMState for TPM CRB with the newly introduced\n command and response buffers, along with a needed callback, so that\n newer QEMU only sends the buffers if it is necessary.\n- Add hw_compat blocker because the feature is only supported for\n machine type 11.1 and higher.\n- If the VM has no pending chunked TPM commands in the internal buffers\n during a VM migration, or if the machine type does not support newly\n introduced buffers, then the needed callback will return false, as it\n checks the hw_compat blocker and thus the subsection will not be sent\n to the destination host.\n\nSigned-off-by: Arun Menon <armenon@redhat.com>\n---\n hw/core/machine.c | 4 +++-\n hw/tpm/tpm_crb.c | 31 +++++++++++++++++++++++++++++++\n 2 files changed, 34 insertions(+), 1 deletion(-)", "diff": "diff --git a/hw/core/machine.c b/hw/core/machine.c\nindex 1abc8ae737..fb290c6c53 100644\n--- a/hw/core/machine.c\n+++ b/hw/core/machine.c\n@@ -38,7 +38,9 @@\n #include \"hw/acpi/generic_event_device.h\"\n #include \"qemu/audio.h\"\n \n-GlobalProperty hw_compat_11_0[] = {};\n+GlobalProperty hw_compat_11_0[] = {\n+ { \"tpm-crb\", \"migrate-buffers\", \"off\"},\n+};\n const size_t hw_compat_11_0_len = G_N_ELEMENTS(hw_compat_11_0);\n \n GlobalProperty hw_compat_10_2[] = {\ndiff --git a/hw/tpm/tpm_crb.c b/hw/tpm/tpm_crb.c\nindex b9f295db7a..81471dd9f8 100644\n--- a/hw/tpm/tpm_crb.c\n+++ b/hw/tpm/tpm_crb.c\n@@ -49,6 +49,8 @@ struct CRBState {\n \n bool ppi_enabled;\n TPMPPI ppi;\n+\n+ bool migrate_buffers;\n };\n typedef struct CRBState CRBState;\n \n@@ -345,18 +347,47 @@ static int tpm_crb_pre_save(void *opaque)\n return 0;\n }\n \n+static bool tpm_crb_chunk_needed(void *opaque)\n+{\n+ CRBState *s = opaque;\n+\n+ if (!s->migrate_buffers) {\n+ return false;\n+ }\n+\n+ return ((s->command_buffer && s->command_buffer->len > 0) ||\n+ (s->response_buffer && s->response_buffer->len > 0));\n+}\n+\n+static const VMStateDescription vmstate_tpm_crb_chunk = {\n+ .name = \"tpm-crb/chunk\",\n+ .version_id = 0,\n+ .needed = tpm_crb_chunk_needed,\n+ .fields = (const VMStateField[]) {\n+ VMSTATE_GBYTEARRAY(command_buffer, CRBState, 0),\n+ VMSTATE_GBYTEARRAY(response_buffer, CRBState, 0),\n+ VMSTATE_UINT32(response_offset, CRBState),\n+ VMSTATE_END_OF_LIST()\n+ }\n+};\n+\n static const VMStateDescription vmstate_tpm_crb = {\n .name = \"tpm-crb\",\n .pre_save = tpm_crb_pre_save,\n .fields = (const VMStateField[]) {\n VMSTATE_UINT32_ARRAY(regs, CRBState, TPM_CRB_R_MAX),\n VMSTATE_END_OF_LIST(),\n+ },\n+ .subsections = (const VMStateDescription * const []) {\n+ &vmstate_tpm_crb_chunk,\n+ NULL,\n }\n };\n \n static const Property tpm_crb_properties[] = {\n DEFINE_PROP_TPMBE(\"tpmdev\", CRBState, tpmbe),\n DEFINE_PROP_BOOL(\"ppi\", CRBState, ppi_enabled, true),\n+ DEFINE_PROP_BOOL(\"migrate-buffers\", CRBState, migrate_buffers, true),\n };\n \n static void tpm_crb_reset(void *dev)\n", "prefixes": [ "v3", "06/10" ] }