From nobody Thu Apr 3 11:02:52 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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 Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1741126563036809.758907709477; Tue, 4 Mar 2025 14:16:03 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tpaOE-0008Lg-0V; Tue, 04 Mar 2025 17:05:26 -0500 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 1tpaOC-0008Kq-Ls for qemu-devel@nongnu.org; Tue, 04 Mar 2025 17:05:24 -0500 Received: from vps-ovh.mhejs.net ([145.239.82.108]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tpaOA-0000ie-1l for qemu-devel@nongnu.org; Tue, 04 Mar 2025 17:05:23 -0500 Received: from MUA by vps-ovh.mhejs.net with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.98) (envelope-from ) id 1tpaO6-00000000LXG-0LsK; Tue, 04 Mar 2025 23:05:18 +0100 From: "Maciej S. Szmigiero" To: Peter Xu , Fabiano Rosas Cc: Alex Williamson , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , Eric Blake , Markus Armbruster , =?UTF-8?q?Daniel=20P=20=2E=20Berrang=C3=A9?= , Avihai Horon , Joao Martins , qemu-devel@nongnu.org Subject: [PATCH v6 06/36] migration: Add qemu_loadvm_load_state_buffer() and its handler Date: Tue, 4 Mar 2025 23:03:33 +0100 Message-ID: <71ca753286b87831ced4afd422e2e2bed071af25.1741124640.git.maciej.szmigiero@oracle.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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=145.239.82.108; envelope-from=mhej@vps-ovh.mhejs.net; helo=vps-ovh.mhejs.net X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_PASS=-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-ZM-MESSAGEID: 1741126564408019000 Content-Type: text/plain; charset="utf-8" From: "Maciej S. Szmigiero" qemu_loadvm_load_state_buffer() and its load_state_buffer SaveVMHandler allow providing device state buffer to explicitly specified device via its idstr and instance id. Reviewed-by: Fabiano Rosas Reviewed-by: Peter Xu Signed-off-by: Maciej S. Szmigiero --- include/migration/register.h | 15 +++++++++++++++ migration/savevm.c | 23 +++++++++++++++++++++++ migration/savevm.h | 3 +++ 3 files changed, 41 insertions(+) diff --git a/include/migration/register.h b/include/migration/register.h index ff0faf5f68c8..58891aa54b76 100644 --- a/include/migration/register.h +++ b/include/migration/register.h @@ -229,6 +229,21 @@ typedef struct SaveVMHandlers { */ int (*load_state)(QEMUFile *f, void *opaque, int version_id); =20 + /** + * @load_state_buffer (invoked outside the BQL) + * + * Load device state buffer provided to qemu_loadvm_load_state_buffer(= ). + * + * @opaque: data pointer passed to register_savevm_live() + * @buf: the data buffer to load + * @len: the data length in buffer + * @errp: pointer to Error*, to store an error if it happens. + * + * Returns true to indicate success and false for errors. + */ + bool (*load_state_buffer)(void *opaque, char *buf, size_t len, + Error **errp); + /** * @load_setup * diff --git a/migration/savevm.c b/migration/savevm.c index faebf47ef51f..7c1aa8ad7b9d 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -3060,6 +3060,29 @@ int qemu_loadvm_approve_switchover(void) return migrate_send_rp_switchover_ack(mis); } =20 +bool qemu_loadvm_load_state_buffer(const char *idstr, uint32_t instance_id, + char *buf, size_t len, Error **errp) +{ + SaveStateEntry *se; + + se =3D find_se(idstr, instance_id); + if (!se) { + error_setg(errp, + "Unknown idstr %s or instance id %u for load state buff= er", + idstr, instance_id); + return false; + } + + if (!se->ops || !se->ops->load_state_buffer) { + error_setg(errp, + "idstr %s / instance %u has no load state buffer operat= ion", + idstr, instance_id); + return false; + } + + return se->ops->load_state_buffer(se->opaque, buf, len, errp); +} + bool save_snapshot(const char *name, bool overwrite, const char *vmstate, bool has_devices, strList *devices, Error **errp) { diff --git a/migration/savevm.h b/migration/savevm.h index 58f871a7ed9c..cb58434a9437 100644 --- a/migration/savevm.h +++ b/migration/savevm.h @@ -71,4 +71,7 @@ int qemu_loadvm_approve_switchover(void); int qemu_savevm_state_complete_precopy_non_iterable(QEMUFile *f, bool in_postcopy); =20 +bool qemu_loadvm_load_state_buffer(const char *idstr, uint32_t instance_id, + char *buf, size_t len, Error **errp); + #endif