From nobody Thu Apr 3 11:37:41 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=suse.de ARC-Seal: i=1; a=rsa-sha256; t=1743086437; cv=none; d=zohomail.com; s=zohoarc; b=T73T/sOZZAFz2BSa4cHdvhidJl6iHvW/7MZsPBPdzjSUQplYfLYX0aCHGglEuImVi0poWmINz1+fwD8rRh7KhnlMabB2/KX/m5GeKVevIg6VTjWs5GSPdHUnEVYOnZ1vHSTJaPkL/4Lfl6hmuMoPXKKc65KDWUUNPtb3NJemxgo= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1743086437; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=9JoqtdTugN+FwCPJW4PNptDGkquwWXj5Pm61EHfGRf4=; b=iGgcGh+q6A55K4A7PbFGpZmSQZnrfGpa0dxNeEAKSMuIjjfBJRBKTgYaZ4GQB/PdV3bWQMOoCKtzjQSRrR0GE1kkXoM6xrKWMHvFja+cccDlsX0OePOdF7ShzeUSzuK7zjlrrTena9feAhr1llQIIVd4Hk453qwKspq8RbIbE2I= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1743086437026339.1346836301059; Thu, 27 Mar 2025 07:40:37 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1txoOl-0006Vr-An; Thu, 27 Mar 2025 10:39:59 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1txoOa-0006UR-FC for qemu-devel@nongnu.org; Thu, 27 Mar 2025 10:39:49 -0400 Received: from smtp-out2.suse.de ([195.135.223.131]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1txoOY-0005ZI-M3 for qemu-devel@nongnu.org; Thu, 27 Mar 2025 10:39:48 -0400 Received: from imap1.dmz-prg2.suse.org (unknown [10.150.64.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 962331F79D; Thu, 27 Mar 2025 14:39:41 +0000 (UTC) Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 8BC6D139D4; Thu, 27 Mar 2025 14:39:39 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id iJseEytj5WcVZgAAD6G6ig (envelope-from ); Thu, 27 Mar 2025 14:39:39 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1743086381; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=9JoqtdTugN+FwCPJW4PNptDGkquwWXj5Pm61EHfGRf4=; b=y92ZJafVtCMkACwY+SY7DVXPm+KcUyPlcD+aG1ftZZPVtHShKcxUPu1Lus8vizWWEG8uHb uYGC5MHB/QM2bkNLp1cOmffxJLhZrwk9Gch5fCK8yGeyNsygrSNMiSRnFFQbLE7vSXHKGk LDPReZme76weGNzCmnK71DqrXsKCtYM= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1743086381; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=9JoqtdTugN+FwCPJW4PNptDGkquwWXj5Pm61EHfGRf4=; b=GTzm0oQafmhBu6heaOXi6vSdU8aglkWCp5Zm1MpRixe/fBmenaugQPDlcgmjtk/DZIPHgo OWcQFi45fqAbQHDQ== Authentication-Results: smtp-out2.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1743086381; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=9JoqtdTugN+FwCPJW4PNptDGkquwWXj5Pm61EHfGRf4=; b=y92ZJafVtCMkACwY+SY7DVXPm+KcUyPlcD+aG1ftZZPVtHShKcxUPu1Lus8vizWWEG8uHb uYGC5MHB/QM2bkNLp1cOmffxJLhZrwk9Gch5fCK8yGeyNsygrSNMiSRnFFQbLE7vSXHKGk LDPReZme76weGNzCmnK71DqrXsKCtYM= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1743086381; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=9JoqtdTugN+FwCPJW4PNptDGkquwWXj5Pm61EHfGRf4=; b=GTzm0oQafmhBu6heaOXi6vSdU8aglkWCp5Zm1MpRixe/fBmenaugQPDlcgmjtk/DZIPHgo OWcQFi45fqAbQHDQ== From: Fabiano Rosas To: qemu-devel@nongnu.org Cc: Peter Xu , Prasad Pandit , Juraj Marcin , berrange@redhat.com, Marco Cavenati Subject: [PATCH 1/4] migration/savevm: Add a compatibility check for capabilities Date: Thu, 27 Mar 2025 11:39:31 -0300 Message-Id: <20250327143934.7935-2-farosas@suse.de> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20250327143934.7935-1-farosas@suse.de> References: <20250327143934.7935-1-farosas@suse.de> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spam-Score: -2.80 X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[99.99%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_FIVE(0.00)[6]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.de:mid,suse.de:email]; RCVD_TLS_ALL(0.00)[] Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=195.135.223.131; envelope-from=farosas@suse.de; 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, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @suse.de) X-ZM-MESSAGEID: 1743086439047019100 Content-Type: text/plain; charset="utf-8" It has always been possible to enable arbitrary migration capabilities and attempt to take a snapshot of the VM with the savevm/loadvm commands as well as their QMP counterparts snapshot-save/snapshot-load. Most migration capabilities are not meant to be used with snapshots and there's a risk of crashing QEMU or producing incorrect behavior. Ideally, every migration capability would either be implemented for savevm or explicitly rejected. Add a compatibility check routine and reject the snapshot command if an incompatible capability is enabled. For now only act on the the two that actually cause a crash: multifd and mapped-ram. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2881 Signed-off-by: Fabiano Rosas --- migration/options.c | 26 ++++++++++++++++++++++++++ migration/options.h | 1 + migration/savevm.c | 8 ++++++++ 3 files changed, 35 insertions(+) diff --git a/migration/options.c b/migration/options.c index b0ac2ea408..8772b98dca 100644 --- a/migration/options.c +++ b/migration/options.c @@ -443,11 +443,37 @@ INITIALIZE_MIGRATE_CAPS_SET(check_caps_background_sna= pshot, MIGRATION_CAPABILITY_VALIDATE_UUID, MIGRATION_CAPABILITY_ZERO_COPY_SEND); =20 +/* Snapshot compatibility check list */ +static const +INITIALIZE_MIGRATE_CAPS_SET(check_caps_savevm, + MIGRATION_CAPABILITY_MULTIFD, + MIGRATION_CAPABILITY_MAPPED_RAM, +); + static bool migrate_incoming_started(void) { return !!migration_incoming_get_current()->transport_data; } =20 +bool migrate_can_snapshot(Error **errp) +{ + MigrationState *s =3D migrate_get_current(); + int i; + + for (i =3D 0; i < check_caps_savevm.size; i++) { + int incomp_cap =3D check_caps_savevm.caps[i]; + + if (s->capabilities[incomp_cap]) { + error_setg(errp, + "Snapshots are not compatible with %s", + MigrationCapability_str(incomp_cap)); + return false; + } + } + + return true; +} + /** * @migration_caps_check - check capability compatibility * diff --git a/migration/options.h b/migration/options.h index 762be4e641..20b71b6f2a 100644 --- a/migration/options.h +++ b/migration/options.h @@ -58,6 +58,7 @@ bool migrate_tls(void); /* capabilities helpers */ =20 bool migrate_caps_check(bool *old_caps, bool *new_caps, Error **errp); +bool migrate_can_snapshot(Error **errp); =20 /* parameters */ =20 diff --git a/migration/savevm.c b/migration/savevm.c index ce158c3512..3be13bcfe8 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -3229,6 +3229,10 @@ bool save_snapshot(const char *name, bool overwrite,= const char *vmstate, =20 GLOBAL_STATE_CODE(); =20 + if (!migrate_can_snapshot(errp)) { + return false; + } + if (migration_is_blocked(errp)) { return false; } @@ -3413,6 +3417,10 @@ bool load_snapshot(const char *name, const char *vms= tate, int ret; MigrationIncomingState *mis =3D migration_incoming_get_current(); =20 + if (!migrate_can_snapshot(errp)) { + return false; + } + if (!bdrv_all_can_snapshot(has_devices, devices, errp)) { return false; } --=20 2.35.3