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GET /api/patches/2215591/?format=api
{ "id": 2215591, "url": "http://patchwork.ozlabs.org/api/patches/2215591/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260324194333.30004-14-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": "<20260324194333.30004-14-farosas@suse.de>", "list_archive_url": null, "date": "2026-03-24T19:43:28", "name": "[RFC,v1,13/17] vmstate: Drop VMS_ARRAY_OF_POINTER_AUTO_ALLOC", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "7142292033fc0801e45b438ac14c2f40e272794a", "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/20260324194333.30004-14-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/2215591/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2215591/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=SG+MIn1u;\n\tdkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=nlPayM8p;\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=SG+MIn1u;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=nlPayM8p;\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=1774381437;\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=CKGmz+lKmXdFvQ91j7EaHfHSLwUO7DpcItY8Bz2/bO0=;\n b=nlPayM8pI51QIJeluhDW03aZYIxWpK6p0GtV0CF6hwYSy9kIH0c6jARU7CoUE05AumlHdh\n hssoq/kQ/yxYoIBw==", "v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_rsa;\n t=1774381437;\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=CKGmz+lKmXdFvQ91j7EaHfHSLwUO7DpcItY8Bz2/bO0=;\n b=SG+MIn1ujA8J03/2tK3CgElz6d4fQBTORqaGA5QX0uHCzFWL/6zLwCvF08hCJXZCPfu5of\n tK+asjnku9MLSeT48qjXVDfUpVpqpe3PB1EYag3lu4A1CotxXv2NOawxRO1fPkBUQrkVJL\n CdHtd+FRD1ouumsBQMA5qwnfCbuftmg=", "v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_ed25519; t=1774381437;\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=CKGmz+lKmXdFvQ91j7EaHfHSLwUO7DpcItY8Bz2/bO0=;\n b=nlPayM8pI51QIJeluhDW03aZYIxWpK6p0GtV0CF6hwYSy9kIH0c6jARU7CoUE05AumlHdh\n hssoq/kQ/yxYoIBw==" ], "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 13/17] vmstate: Drop VMS_ARRAY_OF_POINTER_AUTO_ALLOC", "Date": "Tue, 24 Mar 2026 16:43:28 -0300", "Message-ID": "<20260324194333.30004-14-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=2a07:de40:b251:101:10:150:64:1;\n envelope-from=farosas@suse.de; helo=smtp-out1.suse.de", "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, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, 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 semantics of the VMS_ARRAY_OF_POINTER_AUTO_ALLOC of allocating\nmemory dynamically for an array of pointers could be thought to be the\nsame as the currently non-existent combination of VMS_ARRAY_OF_POINTER\n| VMS_ALLOC. The code is now able to handle such invalid combination,\nso drop the new flag and enable the VMS_ARRAY_OF_POINTER | VMS_ALLOC\ncombo.\n\nNote: I don't quite understand why we cannot allocate the first\nelement of the array with VMS_ARRAY_OF_POINTER_AUTO_ALLOC, so I\navoided that case when using the other flags as well.\n\nSigned-off-by: Fabiano Rosas <farosas@suse.de>\n---\n include/migration/vmstate.h | 21 +++++----------------\n migration/savevm.c | 28 ++++++++++++----------------\n migration/vmstate.c | 12 +++++++-----\n 3 files changed, 24 insertions(+), 37 deletions(-)", "diff": "diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h\nindex 70bebc60ed..bf12df66e2 100644\n--- a/include/migration/vmstate.h\n+++ b/include/migration/vmstate.h\n@@ -146,8 +146,8 @@ enum VMStateFlags {\n /* When loading serialised VM state, allocate memory for the\n * (entire) field. Only valid in combination with\n * VMS_POINTER. Note: Not all combinations with other flags are\n- * currently supported, e.g. VMS_ALLOC|VMS_ARRAY_OF_POINTER won't\n- * cause the individual entries to be allocated. */\n+ * currently supported.\n+ */\n VMS_ALLOC = 0x2000,\n \n /* Multiply the number of entries given by the integer at opaque +\n@@ -161,19 +161,8 @@ enum VMStateFlags {\n * structure we are referencing to use. */\n VMS_VSTRUCT = 0x8000,\n \n- /*\n- * This is a sub-flag for VMS_ARRAY_OF_POINTER, so VMS_ARRAY_OF_POINTER\n- * must be set altogether. When set, it means array elements can\n- * contain either valid or NULL pointers, vmstate core will sync it\n- * between the two QEMU instances via the stream protocol. When it's a\n- * valid pointer, the vmstate core will be responsible to do the proper\n- * memory allocations. It also means user of this flag must prepare\n- * the array to be all NULLs otherwise memory may leak.\n- */\n- VMS_ARRAY_OF_POINTER_AUTO_ALLOC = 0x10000,\n-\n /* Marker for end of list */\n- VMS_END = 0x20000,\n+ VMS_END = 0x10000,\n };\n \n typedef enum {\n@@ -610,7 +599,7 @@ extern const VMStateInfo vmstate_info_qlist;\n .size = sizeof(_type), \\\n .flags = VMS_POINTER | VMS_VARRAY_UINT8 | \\\n VMS_ARRAY_OF_POINTER | VMS_STRUCT | \\\n- VMS_ARRAY_OF_POINTER_AUTO_ALLOC, \\\n+ VMS_ALLOC, \\\n .offset = vmstate_offset_pointer(_state, _field, _type *), \\\n }\n \n@@ -623,7 +612,7 @@ extern const VMStateInfo vmstate_info_qlist;\n .size = sizeof(_type), \\\n .flags = VMS_POINTER | VMS_VARRAY_UINT32 | \\\n VMS_ARRAY_OF_POINTER | VMS_STRUCT | \\\n- VMS_ARRAY_OF_POINTER_AUTO_ALLOC, \\\n+ VMS_ALLOC, \\\n .offset = vmstate_offset_pointer(_state, _field, _type *), \\\n }\n \ndiff --git a/migration/savevm.c b/migration/savevm.c\nindex db0721996c..5170928d87 100644\n--- a/migration/savevm.c\n+++ b/migration/savevm.c\n@@ -869,7 +869,8 @@ static void vmstate_check(const VMStateDescription *vmsd)\n if (field) {\n while (field->name) {\n if (field->flags & VMS_ARRAY_OF_POINTER) {\n- if (field->flags & VMS_ARRAY_OF_POINTER_AUTO_ALLOC) {\n+ if (field->flags & VMS_ARRAY_OF_POINTER &&\n+ field->flags & VMS_ALLOC) {\n /*\n * Size must be provided because dest QEMU needs that\n * info to know what to allocate\n@@ -882,22 +883,17 @@ static void vmstate_check(const VMStateDescription *vmsd)\n * setup of sizes in this case.\n */\n assert(field->size == 0 && field->size_offset == 0);\n+\n+ /*\n+ * Without VMS_ALLOC, VMS_ARRAY_OF_POINTER must be\n+ * used only together with one of VMS_(V)ARRAY*\n+ * flags.\n+ */\n+ assert(field->flags & (VMS_ARRAY | VMS_VARRAY_INT32 |\n+ VMS_VARRAY_UINT16 |\n+ VMS_VARRAY_UINT8 |\n+ VMS_VARRAY_UINT32));\n }\n- /*\n- * VMS_ARRAY_OF_POINTER must be used only together with one\n- * of VMS_(V)ARRAY* flags.\n- */\n- assert(field->flags & (VMS_ARRAY | VMS_VARRAY_INT32 |\n- VMS_VARRAY_UINT16 | VMS_VARRAY_UINT8 |\n- VMS_VARRAY_UINT32));\n- }\n-\n- /*\n- * When VMS_ARRAY_OF_POINTER_ALLOW_NULL is used, we must have\n- * VMS_ARRAY_OF_POINTER set too.\n- */\n- if (field->flags & VMS_ARRAY_OF_POINTER_AUTO_ALLOC) {\n- assert(field->flags & VMS_ARRAY_OF_POINTER);\n }\n \n if (field->flags & (VMS_STRUCT | VMS_VSTRUCT)) {\ndiff --git a/migration/vmstate.c b/migration/vmstate.c\nindex c1ad0ef9a5..8f0f9383e2 100644\n--- a/migration/vmstate.c\n+++ b/migration/vmstate.c\n@@ -115,7 +115,7 @@ static void *vmstate_first(void *opaque, const VMStateField *field,\n {\n void **first = opaque + field->offset;\n \n- if (alloc) {\n+ if (alloc && field->flags & VMS_ALLOC) {\n return vmstate_handle_alloc(first, size, n);\n }\n \n@@ -142,7 +142,7 @@ static void *vmstate_next(void **first, const VMStateField *field,\n next = *array_elem;\n \n if (alloc) {\n- if (!next || field->flags & VMS_ARRAY_OF_POINTER_AUTO_ALLOC) {\n+ if (!next || field->flags & VMS_ALLOC) {\n /*\n * NOTE: do not use vmstate_size() here, because we\n * need the object size, not entry size of the\n@@ -291,7 +291,7 @@ bool vmstate_load_vmsd(QEMUFile *f, const VMStateDescription *vmsd,\n int size = vmstate_size(opaque, field);\n \n head = vmstate_first(opaque, field, size, n_elems,\n- field->flags & VMS_ALLOC);\n+ !(field->flags & VMS_ARRAY_OF_POINTER));\n \n for (i = 0; i < n_elems; i++) {\n /* If we will process the load of field? */\n@@ -408,7 +408,8 @@ static bool vmsd_can_compress(const VMStateField *field)\n return false;\n }\n \n- if (field->flags & VMS_ARRAY_OF_POINTER_AUTO_ALLOC) {\n+ if (field->flags & VMS_ARRAY_OF_POINTER &&\n+ field->flags & VMS_ALLOC) {\n /*\n * This may involve two VMSD fields to be dumped, one for the\n * marker to show if the pointer is NULL, followed by the real\n@@ -659,7 +660,8 @@ static bool vmstate_save_vmsd_v(QEMUFile *f, const VMStateDescription *vmsd,\n * marker first for each element saying if it's populated.\n */\n use_dynamic_array =\n- field->flags & VMS_ARRAY_OF_POINTER_AUTO_ALLOC;\n+ field->flags & VMS_ARRAY_OF_POINTER &&\n+ field->flags & VMS_ALLOC;\n \n use_marker_field = use_dynamic_array || is_null;\n \n", "prefixes": [ "RFC", "v1", "13/17" ] }