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a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1741371359; 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=1i7apSn15jQatTnXZMO4odm/liOMWciUMfs5vbKW9dY=; b=ePiWN5bnkK/Uguev+iO2d/FL9AWXx00iTSk8ydLhmSWKwoW1L3G73JRTM9oAkh/uYmi6qi DB270YjOaKjHhYBjs2kH0/EyVw6jXlwQ9xdkt8x6vV+mGOn0ZA5hcy+6OYg6PzLNA1yybq QxcanPUk6TgQ1i01b9t5sshhJOMyteM= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1741371359; 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=1i7apSn15jQatTnXZMO4odm/liOMWciUMfs5vbKW9dY=; b=BiFB5SZGuBt+aEjkbZVpx2q0tt3sh5WsdkB9Y2I/jQIT+Jxzy7tW8woQ0DYS47IW1HXVyH 8yixcjQMT02uRPAQ== From: Fabiano Rosas To: qemu-devel@nongnu.org Cc: Peter Xu , Steve Sistare , David Hildenbrand Subject: [PULL 2/8] migration: ram block cpr blockers Date: Fri, 7 Mar 2025 15:15:45 -0300 Message-Id: <20250307181551.19887-3-farosas@suse.de> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20250307181551.19887-1-farosas@suse.de> References: <20250307181551.19887-1-farosas@suse.de> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: D7A9A21190 X-Spam-Score: -3.01 X-Rspamd-Action: no action X-Spamd-Result: default: False [-3.01 / 50.00]; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a07:de40:b251:101:10:150:64:1; 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, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, 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) (identity @suse.de) X-ZM-MESSAGEID: 1741371504977019000 Content-Type: text/plain; charset="utf-8" From: Steve Sistare Unlike cpr-reboot mode, cpr-transfer mode cannot save volatile ram blocks in the migration stream file and recreate them later, because the physical memory for the blocks is pinned and registered for vfio. Add a blocker for volatile ram blocks. Also add a blocker for RAM_GUEST_MEMFD. Preserving guest_memfd may be sufficient for CPR, but it has not been tested yet. Signed-off-by: Steve Sistare Reviewed-by: Fabiano Rosas Reviewed-by: Peter Xu Reviewed-by: David Hildenbrand Message-ID: <1740667681-257312-1-git-send-email-steven.sistare@oracle.com> Signed-off-by: Fabiano Rosas --- include/exec/memory.h | 3 ++ include/exec/ramblock.h | 1 + migration/savevm.c | 2 ++ system/physmem.c | 66 +++++++++++++++++++++++++++++++++++++++++ 4 files changed, 72 insertions(+) diff --git a/include/exec/memory.h b/include/exec/memory.h index 78c4e0aec8..d09af58c97 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -3203,6 +3203,9 @@ bool ram_block_discard_is_disabled(void); */ bool ram_block_discard_is_required(void); =20 +void ram_block_add_cpr_blocker(RAMBlock *rb, Error **errp); +void ram_block_del_cpr_blocker(RAMBlock *rb); + #endif =20 #endif diff --git a/include/exec/ramblock.h b/include/exec/ramblock.h index 0babd105c0..64484cd821 100644 --- a/include/exec/ramblock.h +++ b/include/exec/ramblock.h @@ -39,6 +39,7 @@ struct RAMBlock { /* RCU-enabled, writes protected by the ramlist lock */ QLIST_ENTRY(RAMBlock) next; QLIST_HEAD(, RAMBlockNotifier) ramblock_notifiers; + Error *cpr_blocker; int fd; uint64_t fd_offset; int guest_memfd; diff --git a/migration/savevm.c b/migration/savevm.c index 5c4fdfd95e..ce158c3512 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -3514,12 +3514,14 @@ void vmstate_register_ram(MemoryRegion *mr, DeviceS= tate *dev) qemu_ram_set_idstr(mr->ram_block, memory_region_name(mr), dev); qemu_ram_set_migratable(mr->ram_block); + ram_block_add_cpr_blocker(mr->ram_block, &error_fatal); } =20 void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev) { qemu_ram_unset_idstr(mr->ram_block); qemu_ram_unset_migratable(mr->ram_block); + ram_block_del_cpr_blocker(mr->ram_block); } =20 void vmstate_register_ram_global(MemoryRegion *mr) diff --git a/system/physmem.c b/system/physmem.c index 8c1736f84e..445981a1b4 100644 --- a/system/physmem.c +++ b/system/physmem.c @@ -70,7 +70,10 @@ =20 #include "qemu/pmem.h" =20 +#include "qapi/qapi-types-migration.h" +#include "migration/blocker.h" #include "migration/cpr.h" +#include "migration/options.h" #include "migration/vmstate.h" =20 #include "qemu/range.h" @@ -1903,6 +1906,14 @@ static void ram_block_add(RAMBlock *new_block, Error= **errp) qemu_mutex_unlock_ramlist(); goto out_free; } + + error_setg(&new_block->cpr_blocker, + "Memory region %s uses guest_memfd, " + "which is not supported with CPR.", + memory_region_name(new_block->mr)); + migrate_add_blocker_modes(&new_block->cpr_blocker, errp, + MIG_MODE_CPR_TRANSFER, + -1); } =20 ram_size =3D (new_block->offset + new_block->max_length) >> TARGET_PAG= E_BITS; @@ -4094,3 +4105,58 @@ bool ram_block_discard_is_required(void) return qatomic_read(&ram_block_discard_required_cnt) || qatomic_read(&ram_block_coordinated_discard_required_cnt); } + +/* + * Return true if ram is compatible with CPR. Do not exclude rom, + * because the rom file could change in new QEMU. + */ +static bool ram_is_cpr_compatible(RAMBlock *rb) +{ + MemoryRegion *mr =3D rb->mr; + + if (!mr || !memory_region_is_ram(mr)) { + return true; + } + + /* Ram device is remapped in new QEMU */ + if (memory_region_is_ram_device(mr)) { + return true; + } + + /* + * A file descriptor is passed to new QEMU and remapped, or its backing + * file is reopened and mapped. It must be shared to avoid COW. + */ + if (rb->fd >=3D 0 && qemu_ram_is_shared(rb)) { + return true; + } + + return false; +} + +/* + * Add a blocker for each volatile ram block. This function should only be + * called after we know that the block is migratable. Non-migratable bloc= ks + * are either re-created in new QEMU, or are handled specially, or are cov= ered + * by a device-level CPR blocker. + */ +void ram_block_add_cpr_blocker(RAMBlock *rb, Error **errp) +{ + assert(qemu_ram_is_migratable(rb)); + + if (ram_is_cpr_compatible(rb)) { + return; + } + + error_setg(&rb->cpr_blocker, + "Memory region %s is not compatible with CPR. share=3Don is= " + "required for memory-backend objects, and aux-ram-share=3Do= n is " + "required.", memory_region_name(rb->mr)); + migrate_add_blocker_modes(&rb->cpr_blocker, errp, MIG_MODE_CPR_TRANSFE= R, + -1); +} + +void ram_block_del_cpr_blocker(RAMBlock *rb) +{ + migrate_del_blocker(&rb->cpr_blocker); +} --=20 2.35.3