{"id":2227460,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2227460/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260423191958.1440-27-farosas@suse.de/","project":{"id":14,"url":"http://patchwork.ozlabs.org/api/1.2/projects/14/?format=json","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":"<20260423191958.1440-27-farosas@suse.de>","list_archive_url":null,"date":"2026-04-23T19:19:40","name":"[PULL,26/43] vmstate: Do not set size for VMS_ARRAY_OF_POINTER","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"bbb59265a06afbfe2a33fe1216006a977dcf2daa","submitter":{"id":85343,"url":"http://patchwork.ozlabs.org/api/1.2/people/85343/?format=json","name":"Fabiano Rosas","email":"farosas@suse.de"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260423191958.1440-27-farosas@suse.de/mbox/","series":[{"id":501236,"url":"http://patchwork.ozlabs.org/api/1.2/series/501236/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/list/?series=501236","date":"2026-04-23T19:19:14","name":"[PULL,01/43] checkpatch: Allow spaces after all coroutine annotations","version":1,"mbox":"http://patchwork.ozlabs.org/series/501236/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2227460/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2227460/checks/","tags":{},"related":[],"headers":{"Return-Path":"","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=suse.de header.i=@suse.de header.a=rsa-sha256\n header.s=susede2_rsa header.b=d0ewgjhf;\n\tdkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=x3pVkF6e;\n\tdkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de\n header.a=rsa-sha256 header.s=susede2_rsa header.b=d0ewgjhf;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=x3pVkF6e;\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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envelope-from=farosas@suse.de;\n helo=smtp-out1.suse.de","X-Spam_score_int":"-43","X-Spam_score":"-4.4","X-Spam_bar":"----","X-Spam_report":"(-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=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 ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"},"content":"From: Peter Xu \n\nWhen VMS_ARRAY_OF_POINTER is specified, it means the vmstate field is an\narray of pointers.\n\nThe size of the element is not relevant to whatever it is stored inside: it\nis always the host pointer size.\n\nLet's reserve the \"size\" field in this case for future use, update\nvmstate_size() so as to make it still work for array of pointers properly.\n\nWhen at this, provide rich documentation on how size / size_offset works in\nvmstate.\n\nReviewed-by: Alexander Mikhalitsyn \nReviewed-by: Fabiano Rosas \nReviewed-by: Philippe Mathieu-Daudé \nSigned-off-by: Peter Xu \nReviewed-by: Juraj Marcin \nLink: https://lore.kernel.org/qemu-devel/20260401202844.673494-4-peterx@redhat.com\nSigned-off-by: Fabiano Rosas \n---\n include/migration/vmstate.h | 20 ++++++++++++++++----\n migration/savevm.c | 3 +++\n migration/vmstate.c | 10 +++++++++-\n 3 files changed, 28 insertions(+), 5 deletions(-)","diff":"diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h\nindex 32bb8e8ebc..350e62a55a 100644\n--- a/include/migration/vmstate.h\n+++ b/include/migration/vmstate.h\n@@ -183,11 +183,26 @@ typedef enum {\n struct VMStateField {\n const char *name;\n size_t offset;\n+\n+ /*\n+ * @size or @size_offset specifies the size of the element embeded in\n+ * the field. Only one of them should be present never both. When\n+ * @size_offset is used together with VMS_VBUFFER, it means the size is\n+ * dynamic calculated instead of a constant.\n+ *\n+ * When the field is an array of any type, this stores the size of one\n+ * element of the array.\n+ *\n+ * NOTE: even if VMS_POINTER or VMS_ARRAY_OF_POINTER may be specified,\n+ * this parameter always reflects the real size of the objects that a\n+ * pointer point to.\n+ */\n size_t size;\n+ size_t size_offset;\n+\n size_t start;\n int num;\n size_t num_offset;\n- size_t size_offset;\n const VMStateInfo *info;\n enum VMStateFlags flags;\n const VMStateDescription *vmsd;\n@@ -547,7 +562,6 @@ extern const VMStateInfo vmstate_info_qlist;\n .version_id = (_version), \\\n .num = (_num), \\\n .info = &(_info), \\\n- .size = sizeof(_type *), \\\n .flags = VMS_ARRAY|VMS_ARRAY_OF_POINTER, \\\n .offset = vmstate_offset_array(_state, _field, _type *, _num), \\\n }\n@@ -557,7 +571,6 @@ extern const VMStateInfo vmstate_info_qlist;\n .version_id = (_v), \\\n .num = (_n), \\\n .vmsd = &(_vmsd), \\\n- .size = sizeof(_type *), \\\n .flags = VMS_ARRAY|VMS_STRUCT|VMS_ARRAY_OF_POINTER, \\\n .offset = vmstate_offset_array(_s, _f, _type*, _n), \\\n }\n@@ -567,7 +580,6 @@ extern const VMStateInfo vmstate_info_qlist;\n .version_id = (_version), \\\n .num_offset = vmstate_offset_value(_state, _field_num, uint32_t), \\\n .info = &(_info), \\\n- .size = sizeof(_type *), \\\n .flags = VMS_VARRAY_UINT32 | VMS_ARRAY_OF_POINTER | VMS_POINTER, \\\n .offset = vmstate_offset_pointer(_state, _field, _type *), \\\n }\ndiff --git a/migration/savevm.c b/migration/savevm.c\nindex 8115203b51..f5a6fd0c66 100644\n--- a/migration/savevm.c\n+++ b/migration/savevm.c\n@@ -868,6 +868,9 @@ static void vmstate_check(const VMStateDescription *vmsd)\n \n if (field) {\n while (field->name) {\n+ if (field->flags & VMS_ARRAY_OF_POINTER) {\n+ assert(field->size == 0);\n+ }\n if (field->flags & (VMS_STRUCT | VMS_VSTRUCT)) {\n /* Recurse to sub structures */\n vmstate_check(field->vmsd);\ndiff --git a/migration/vmstate.c b/migration/vmstate.c\nindex e98b5f5346..e29a8c3f49 100644\n--- a/migration/vmstate.c\n+++ b/migration/vmstate.c\n@@ -110,13 +110,21 @@ static int vmstate_n_elems(void *opaque, const VMStateField *field)\n \n static int vmstate_size(void *opaque, const VMStateField *field)\n {\n- int size = field->size;\n+ int size;\n \n if (field->flags & VMS_VBUFFER) {\n size = *(int32_t *)(opaque + field->size_offset);\n if (field->flags & VMS_MULTIPLY) {\n size *= field->size;\n }\n+ } else if (field->flags & VMS_ARRAY_OF_POINTER) {\n+ /*\n+ * For an array of pointer, the each element is always size of a\n+ * host pointer.\n+ */\n+ size = sizeof(void *);\n+ } else {\n+ size = field->size;\n }\n \n return size;\n","prefixes":["PULL","26/43"]}