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GET /api/patches/2215596/?format=api
{ "id": 2215596, "url": "http://patchwork.ozlabs.org/api/patches/2215596/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260324194333.30004-13-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": "<20260324194333.30004-13-farosas@suse.de>", "list_archive_url": null, "date": "2026-03-24T19:43:27", "name": "[RFC,v1,12/17] vmstate: Introduce vmstate_next", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "836693530976f3e8c456947c0b9855ebc935f8d5", "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/20260324194333.30004-13-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/2215596/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2215596/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=JNwstzZx;\n\tdkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=xRppBspi;\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=JNwstzZx;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=xRppBspi;\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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Tue, 24 Mar 2026 15:44:20 -0400", "from imap1.dmz-prg2.suse.org (unknown [10.150.64.97])\n (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest\n SHA256)\n (No client certificate requested)\n by smtp-out2.suse.de (Postfix) with ESMTPS id 6C6915BD6E;\n Tue, 24 Mar 2026 19:43:55 +0000 (UTC)", "from imap1.dmz-prg2.suse.org (localhost [127.0.0.1])\n (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest\n SHA256)\n (No client certificate requested)\n by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 45B5343FE4;\n Tue, 24 Mar 2026 19:43:54 +0000 (UTC)", "from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167])\n by imap1.dmz-prg2.suse.org with ESMTPSA id 0KqsBXrpwmlkMQAAD6G6ig\n (envelope-from <farosas@suse.de>); Tue, 24 Mar 2026 19:43:54 +0000" ], "DKIM-Signature": [ "v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_rsa;\n t=1774381435;\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=x+ZyLFL7XlyGoLVRwdhBcneEFYHFSurRSuZsKKjaQzM=;\n b=JNwstzZxCnYm0p6VIp9LTV+kXazLqhgRrBkPt6oldb1H1eS2DlSkFOWYNZdU7Sdc+ARfqG\n OdlV1ocq3poz6wc4CG0q8/1eYTPwQ7BfYKxyc7hmGu2teZrpXAIyd7GS+/rlivkAuCRN2x\n mmOi7pco85kRacR2sZ0R54BRgRmmFKE=", "v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_ed25519; t=1774381435;\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=x+ZyLFL7XlyGoLVRwdhBcneEFYHFSurRSuZsKKjaQzM=;\n b=xRppBspih78ISK0tY7lDs70KoAoLvDGQbpRljEV+M6ts0WTYtqD84tZur+bSd0uCzIBWIy\n NyQj+rWNm0GHzwBw==", "v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_rsa;\n t=1774381435;\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=x+ZyLFL7XlyGoLVRwdhBcneEFYHFSurRSuZsKKjaQzM=;\n b=JNwstzZxCnYm0p6VIp9LTV+kXazLqhgRrBkPt6oldb1H1eS2DlSkFOWYNZdU7Sdc+ARfqG\n OdlV1ocq3poz6wc4CG0q8/1eYTPwQ7BfYKxyc7hmGu2teZrpXAIyd7GS+/rlivkAuCRN2x\n mmOi7pco85kRacR2sZ0R54BRgRmmFKE=", "v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_ed25519; t=1774381435;\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=x+ZyLFL7XlyGoLVRwdhBcneEFYHFSurRSuZsKKjaQzM=;\n b=xRppBspih78ISK0tY7lDs70KoAoLvDGQbpRljEV+M6ts0WTYtqD84tZur+bSd0uCzIBWIy\n NyQj+rWNm0GHzwBw==" ], "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 12/17] vmstate: Introduce vmstate_next", "Date": "Tue, 24 Mar 2026 16:43:27 -0300", "Message-ID": "<20260324194333.30004-13-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-Spamd-Result": "default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%];\n MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000];\n R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-1.000];\n MIME_GOOD(-0.10)[text/plain]; RCVD_VIA_SMTP_AUTH(0.00)[];\n MIME_TRACE(0.00)[0:+]; FUZZY_RATELIMITED(0.00)[rspamd.com];\n TO_DN_SOME(0.00)[]; ARC_NA(0.00)[];\n DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519];\n URIBL_BLOCKED(0.00)[imap1.dmz-prg2.suse.org:helo,suse.de:mid,suse.de:email];\n FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[];\n RCPT_COUNT_THREE(0.00)[4]; RCVD_COUNT_TWO(0.00)[2];\n TO_MATCH_ENVRCPT_ALL(0.00)[];\n DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:mid,suse.de:email];\n RCVD_TLS_ALL(0.00)[]", "X-Spam-Score": "-2.80", "Received-SPF": "pass client-ip=195.135.223.131; envelope-from=farosas@suse.de;\n helo=smtp-out2.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": "Similarly to vmstate_first(), introduce a vmstate_next(), which does\nthe necessary dereferencing of pointers to get to the leaf element. On\nthe load side, allow the caller to pass a flag indicating whether\nallocation is expected and call the allocation function if so.\n\nSigned-off-by: Fabiano Rosas <farosas@suse.de>\n---\n migration/vmstate.c | 84 +++++++++++++++++++++------------------------\n 1 file changed, 39 insertions(+), 45 deletions(-)", "diff": "diff --git a/migration/vmstate.c b/migration/vmstate.c\nindex ab7c6fa4ab..c1ad0ef9a5 100644\n--- a/migration/vmstate.c\n+++ b/migration/vmstate.c\n@@ -127,24 +127,51 @@ static void *vmstate_first(void *opaque, const VMStateField *field,\n return first;\n }\n \n-static bool vmstate_ptr_marker_load(QEMUFile *f, bool *load_field,\n- Error **errp)\n+static void *vmstate_next(void **first, const VMStateField *field,\n+ int size, int i, bool alloc)\n {\n- int byte = qemu_get_byte(f);\n+ void **array_elem;\n+ void *next;\n+\n+ if (!(field->flags & VMS_ARRAY_OF_POINTER)) {\n+ next = (void *)first + size * i;\n+ return next;\n+ }\n+\n+ array_elem = first + i;\n+ next = *array_elem;\n+\n+ if (alloc) {\n+ if (!next || field->flags & VMS_ARRAY_OF_POINTER_AUTO_ALLOC) {\n+ /*\n+ * NOTE: do not use vmstate_size() here, because we\n+ * need the object size, not entry size of the\n+ * array.\n+ */\n+ next = vmstate_handle_alloc(array_elem, field->size, 1);\n+ }\n+ }\n+ return next;\n+}\n+\n+static bool vmstate_ptr_marker_load(QEMUFile *f, bool *load_field)\n+{\n+ int byte = qemu_peek_byte(f, 0);\n \n if (byte == VMS_MARKER_PTR_NULL) {\n /* When it's a null ptr marker, do not continue the load */\n *load_field = false;\n+ qemu_file_skip(f, 1);\n return true;\n }\n \n if (byte == VMS_MARKER_PTR_VALID) {\n /* We need to load this field right after the marker */\n *load_field = true;\n+ qemu_file_skip(f, 1);\n return true;\n }\n \n- error_setg(errp, \"Unexpected ptr marker: %d\", byte);\n return false;\n }\n \n@@ -273,41 +300,13 @@ 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 **)head + i;\n- bool use_dynamic_array =\n- field->flags & VMS_ARRAY_OF_POINTER_AUTO_ALLOC;\n- bool use_marker_field;\n-\n- curr_elem = *array_elem;\n- use_marker_field = use_dynamic_array || !curr_elem;\n-\n- if (use_marker_field) {\n- /* Read the marker instead of VMSD first */\n- if (!vmstate_ptr_marker_load(f, &load_field, errp)) {\n- trace_vmstate_load_field_error(field->name,\n- -EINVAL);\n- return false;\n- }\n-\n- if (load_field) {\n- /*\n- * When reaching here, it means we received a\n- * non-NULL ptr marker, so we need to populate the\n- * field before loading it.\n- *\n- * NOTE: do not use vmstate_size() here, because we\n- * need the object size, not entry size of the\n- * array.\n- */\n- assert(!curr_elem);\n- curr_elem = vmstate_handle_alloc(array_elem,\n- field->size, 1);\n- }\n- }\n- } else {\n- curr_elem = head + size * i;\n+ /* Peek a possible pointer marker instead of VMSD first */\n+ ok = vmstate_ptr_marker_load(f, &load_field);\n }\n \n+ curr_elem = vmstate_next(head, field, size, i,\n+ load_field && ok);\n+\n if (load_field) {\n ok = vmstate_load_field(f, curr_elem, size, field, errp);\n }\n@@ -647,15 +646,11 @@ static bool vmstate_save_vmsd_v(QEMUFile *f, const VMStateDescription *vmsd,\n \n for (i = 0; i < n_elems; i++) {\n bool save_field = true;\n- void *curr_elem;\n+ void *curr_elem = vmstate_next(head, field, size, i, false);\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(array_elem);\n- curr_elem = *array_elem;\n \n is_null = !curr_elem;\n \n@@ -688,7 +683,8 @@ 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 **)(head + size * j);\n+ void *elem = vmstate_next(head, field, size, j,\n+ false);\n bool elem_is_null = !elem;\n \n if (is_null != elem_is_null) {\n@@ -713,8 +709,6 @@ 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", "12/17" ] }