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GET /api/patches/2215597/?format=api
{ "id": 2215597, "url": "http://patchwork.ozlabs.org/api/patches/2215597/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260324194333.30004-12-farosas@suse.de/", "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": "<20260324194333.30004-12-farosas@suse.de>", "list_archive_url": null, "date": "2026-03-24T19:43:26", "name": "[RFC,v1,11/17] vmstate: Introduce vmstate_first", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "985c1e9800becaa95ddb3fed02a89f9aa90d7661", "submitter": { "id": 85343, "url": "http://patchwork.ozlabs.org/api/people/85343/?format=api", "name": "Fabiano Rosas", "email": "farosas@suse.de" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260324194333.30004-12-farosas@suse.de/mbox/", "series": [ { "id": 497339, "url": "http://patchwork.ozlabs.org/api/series/497339/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=497339", "date": "2026-03-24T19:43:16", "name": "migration: vmstate_save|load changes for peterx", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/497339/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2215597/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2215597/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=suse.de header.i=@suse.de header.a=rsa-sha256\n header.s=susede2_rsa header.b=KK/Wsw8n;\n\tdkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=jK1wwOn9;\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=KK/Wsw8n;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=jK1wwOn9;\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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a=ed25519-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_ed25519; t=1774381433;\n h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n mime-version:mime-version:\n content-transfer-encoding:content-transfer-encoding:\n in-reply-to:in-reply-to:references:references;\n bh=ijgwsSEpVbXrAjpHcIRFYxo7WBxDWTudU7OG4QHJ3AQ=;\n b=jK1wwOn9VzlTE8+Yutb/mw+hg0HecGqRmukR9r38aPbSQhprMMU9NvlF8XWLCc8jEkYRdN\n P1+pXKwJRkf/9RCg==", "v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_rsa;\n t=1774381433;\n h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n mime-version:mime-version:\n content-transfer-encoding:content-transfer-encoding:\n in-reply-to:in-reply-to:references:references;\n bh=ijgwsSEpVbXrAjpHcIRFYxo7WBxDWTudU7OG4QHJ3AQ=;\n b=KK/Wsw8nbioLcQYApLSm9S3lANG8PgNU4dJ6s8M9CSGbCk1uuXt1QiBNlNGSHZq1XM6FV+\n IE3R+pT+x7PnV3U/4a6p1gYKZQY5y6bVjnJm3UMO5ezxrjOg+f8QPJFhoLlUqQHI/R7ch+\n u1irXW4j6TBcVcwQPw4FPLOv8h+WBzE=", "v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_ed25519; t=1774381433;\n h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n mime-version:mime-version:\n content-transfer-encoding:content-transfer-encoding:\n in-reply-to:in-reply-to:references:references;\n bh=ijgwsSEpVbXrAjpHcIRFYxo7WBxDWTudU7OG4QHJ3AQ=;\n b=jK1wwOn9VzlTE8+Yutb/mw+hg0HecGqRmukR9r38aPbSQhprMMU9NvlF8XWLCc8jEkYRdN\n P1+pXKwJRkf/9RCg==" ], "From": "Fabiano Rosas <farosas@suse.de>", "To": "qemu-devel@nongnu.org", "Cc": "Peter Xu <peterx@redhat.com>,\n Alexander Mikhalitsyn <alexander@mihalicyn.com>,\n Juraj Marcin <jmarcin@redhat.com>", "Subject": "[RFC PATCH v1 11/17] vmstate: Introduce vmstate_first", "Date": "Tue, 24 Mar 2026 16:43:26 -0300", "Message-ID": "<20260324194333.30004-12-farosas@suse.de>", "X-Mailer": "git-send-email 2.51.0", "In-Reply-To": "<20260324194333.30004-1-farosas@suse.de>", "References": "<20260324194333.30004-1-farosas@suse.de>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Spam-Score": "-2.80", "X-Spamd-Result": "default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%];\n NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[];\n R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-1.000];\n MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[];\n FROM_HAS_DN(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+];\n TO_DN_SOME(0.00)[];\n DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:mid,suse.de:email];\n RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_EQ_ENVFROM(0.00)[];\n RCVD_COUNT_TWO(0.00)[2]; FUZZY_RATELIMITED(0.00)[rspamd.com];\n DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519];\n RCPT_COUNT_THREE(0.00)[4]; RCVD_TLS_ALL(0.00)[]", "Received-SPF": "pass client-ip=195.135.223.130; 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, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, 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 <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": "The vmstate_save|load_vmsd[_v] functions do a bit of juggling of\npointers to allocate/dereference arrays. Introduce a getter for the\nfirst field. Take field->flags into consideration and also allocate\nmemory when necessary.\n\nSigned-off-by: Fabiano Rosas <farosas@suse.de>\n---\nmaybe we can soon have an iterator\n---\n migration/vmstate.c | 67 +++++++++++++++++++++++++--------------------\n 1 file changed, 38 insertions(+), 29 deletions(-)", "diff": "diff --git a/migration/vmstate.c b/migration/vmstate.c\nindex 85e63305f6..ab7c6fa4ab 100644\n--- a/migration/vmstate.c\n+++ b/migration/vmstate.c\n@@ -100,23 +100,31 @@ static int vmstate_size(void *opaque, const VMStateField *field)\n return size;\n }\n \n-static void *vmstate_handle_alloc(void *ptr, const VMStateField *field,\n- int size, int n_elems)\n+static void *vmstate_handle_alloc(void **ptr, int size, int n_elems)\n {\n- void *new = ptr;\n+ size *= n_elems;\n+ if (size) {\n+ *ptr = g_malloc(size);\n+ }\n+\n+ return *ptr;\n+}\n+\n+static void *vmstate_first(void *opaque, const VMStateField *field,\n+ int size, int n, bool alloc)\n+{\n+ void **first = opaque + field->offset;\n+\n+ if (alloc) {\n+ return vmstate_handle_alloc(first, size, n);\n+ }\n \n if (field->flags & VMS_POINTER) {\n- if (field->flags & VMS_ALLOC) {\n- size *= n_elems;\n- if (size) {\n- new = g_malloc(size);\n- *(void **)ptr = new;\n- }\n- }\n- assert(new || !n_elems || !size);\n- return *(void **)ptr;\n+ assert(first || !n || !size);\n+ return *first;\n }\n- return new;\n+\n+ return first;\n }\n \n static bool vmstate_ptr_marker_load(QEMUFile *f, bool *load_field,\n@@ -251,11 +259,12 @@ bool vmstate_load_vmsd(QEMUFile *f, const VMStateDescription *vmsd,\n trace_vmstate_load_state_field(vmsd->name, field->name, exists);\n \n if (exists) {\n- void *first_elem = opaque + field->offset;\n+ void *head;\n int i, n_elems = vmstate_n_elems(opaque, field);\n int size = vmstate_size(opaque, field);\n \n- first_elem = vmstate_handle_alloc(first_elem, field, size, n_elems);\n+ head = vmstate_first(opaque, field, size, n_elems,\n+ field->flags & VMS_ALLOC);\n \n for (i = 0; i < n_elems; i++) {\n /* If we will process the load of field? */\n@@ -264,7 +273,7 @@ bool vmstate_load_vmsd(QEMUFile *f, const VMStateDescription *vmsd,\n void *curr_elem;\n \n if (field->flags & VMS_ARRAY_OF_POINTER) {\n- void **array_elem = (void **)first_elem + i;\n+ void **array_elem = (void **)head + i;\n bool use_dynamic_array =\n field->flags & VMS_ARRAY_OF_POINTER_AUTO_ALLOC;\n bool use_marker_field;\n@@ -290,13 +299,13 @@ bool vmstate_load_vmsd(QEMUFile *f, const VMStateDescription *vmsd,\n * need the object size, not entry size of the\n * array.\n */\n- curr_elem = g_malloc0(field->size);\n- /* Remember to update the root pointer! */\n- *(void **)array_elem = curr_elem;\n+ assert(!curr_elem);\n+ curr_elem = vmstate_handle_alloc(array_elem,\n+ field->size, 1);\n }\n }\n } else {\n- curr_elem = first_elem + size * i;\n+ curr_elem = head + size * i;\n }\n \n if (load_field) {\n@@ -627,28 +636,26 @@ static bool vmstate_save_vmsd_v(QEMUFile *f, const VMStateDescription *vmsd,\n \n while (field->name) {\n if (vmstate_field_exists(vmsd, field, opaque, version_id)) {\n- void *first_elem = opaque + field->offset;\n+ void *head;\n int i, n_elems = vmstate_n_elems(opaque, field);\n int size = vmstate_size(opaque, field);\n bool is_null_prev = false;\n bool use_vmdesc = true;\n \n trace_vmstate_save_state_loop(vmsd->name, field->name, n_elems);\n- if (field->flags & VMS_POINTER) {\n- first_elem = *(void **)first_elem;\n- assert(first_elem || !n_elems || !size);\n- }\n+ head = vmstate_first(opaque, field, size, n_elems, false);\n \n for (i = 0; i < n_elems; i++) {\n bool save_field = true;\n- void *curr_elem = first_elem + size * i;\n+ void *curr_elem;\n int max_elems = n_elems - i;\n \n if (field->flags & VMS_ARRAY_OF_POINTER) {\n bool use_marker_field, is_null, use_dynamic_array;\n+ void **array_elem = (void **)head + i;\n \n- assert(curr_elem);\n- curr_elem = *(void **)curr_elem;\n+ assert(array_elem);\n+ curr_elem = *array_elem;\n \n is_null = !curr_elem;\n \n@@ -681,7 +688,7 @@ static bool vmstate_save_vmsd_v(QEMUFile *f, const VMStateDescription *vmsd,\n use_vmdesc = true;\n \n for (int j = i + 1; j < n_elems; j++) {\n- void *elem = *(void **)(first_elem + size * j);\n+ void *elem = *(void **)(head + size * j);\n bool elem_is_null = !elem;\n \n if (is_null != elem_is_null) {\n@@ -706,6 +713,8 @@ static bool vmstate_save_vmsd_v(QEMUFile *f, const VMStateDescription *vmsd,\n \n save_field = !!curr_elem;\n }\n+ } else {\n+ curr_elem = head + size * i;\n }\n \n if (save_field) {\n", "prefixes": [ "RFC", "v1", "11/17" ] }