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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1732883061; h=from:from:reply-to:subject:subject: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=duTihQd91kkUFnaLWXfg5yhv8RtbDxFtZoWEohSy9gg=; b=ReOcFTducxepOgQSzs83w9DFXmIlzouDtWwYTXE2bK7MM7vHbl0xfRq1gZDWDbZAY4zHd+ K7+sPw3LHAetS4BGUDhhJwdJ9W2wEHVEXGYDquPQD8ytf06CoGMKFdxHkASdPXa/m3Ssfn QUzTGdaUmyeXqWCJPoHIU9A0ufv2JYY= X-MC-Unique: abTvYUEiPxK-LWOtfVqREQ-1 X-Mimecast-MFC-AGG-ID: abTvYUEiPxK-LWOtfVqREQ From: Prasad Pandit To: qemu-devel@nongnu.org Cc: peterx@redhat.com, farosas@suse.de, berrange@redhat.com, Prasad Pandit Subject: [PATCH v2 1/3] migration/multifd: move macros to multifd header Date: Fri, 29 Nov 2024 17:52:54 +0530 Message-ID: <20241129122256.96778-2-ppandit@redhat.com> In-Reply-To: <20241129122256.96778-1-ppandit@redhat.com> References: <20241129122256.96778-1-ppandit@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" From: Prasad Pandit Move MULTIFD_ macros to the header file so that they are accessible from other source files. Signed-off-by: Prasad Pandit Reviewed-by: Fabiano Rosas --- migration/multifd.c | 5 ----- migration/multifd.h | 5 +++++ 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/migration/multifd.c b/migration/multifd.c index 498e71fd10..f8914276c4 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -33,11 +33,6 @@ #include "io/channel-socket.h" #include "yank_functions.h" =20 -/* Multiple fd's */ - -#define MULTIFD_MAGIC 0x11223344U -#define MULTIFD_VERSION 1 - typedef struct { uint32_t magic; uint32_t version; diff --git a/migration/multifd.h b/migration/multifd.h index 50d58c0c9c..519dffeb9e 100644 --- a/migration/multifd.h +++ b/migration/multifd.h @@ -33,6 +33,11 @@ bool multifd_queue_page(RAMBlock *block, ram_addr_t offs= et); bool multifd_recv(void); MultiFDRecvData *multifd_get_recv_data(void); =20 +/* Multiple fd's */ + +#define MULTIFD_MAGIC 0x11223344U +#define MULTIFD_VERSION 1 + /* Multifd Compression flags */ #define MULTIFD_FLAG_SYNC (1 << 0) =20 --=20 2.47.1 From nobody Thu Dec 26 14:30:06 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1732882999; h=from:from:reply-to:subject:subject: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=loxp1y5XflVEKQBsEdu2yzpHVb5tV44nt7hAhklzyos=; b=Dv0oDdBsd5e/WuZRCta/+UD+k800mTaE5Me/hXl/L9ffrGHnKFFfMtEZTHm2mxlOmEtZY9 +pR45/WvNNtjyx1U1yg5jxGiHzEDJf37NpXbEFMu3PK52+2JKToHA1pVybJFCb8Xf3Sbfq IVmha2fUOmowgCcX3zZzbQEOjNerQZU= X-MC-Unique: pZiAtIFROu2FJjgsflLVOA-1 X-Mimecast-MFC-AGG-ID: pZiAtIFROu2FJjgsflLVOA From: Prasad Pandit To: qemu-devel@nongnu.org Cc: peterx@redhat.com, farosas@suse.de, berrange@redhat.com, Prasad Pandit Subject: [PATCH v2 2/3] migration: refactor ram_save_target_page functions Date: Fri, 29 Nov 2024 17:52:55 +0530 Message-ID: <20241129122256.96778-3-ppandit@redhat.com> In-Reply-To: <20241129122256.96778-1-ppandit@redhat.com> References: <20241129122256.96778-1-ppandit@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" From: Prasad Pandit Refactor ram_save_target_page legacy and multifd functions into one. Other than simplifying it, it frees 'migration_ops' object from usage, so it is expunged. Signed-off-by: Prasad Pandit --- migration/ram.c | 67 +++++++++++++------------------------------------ 1 file changed, 17 insertions(+), 50 deletions(-) v2: Make refactoring change independent of the multifd & postcopy change. v1: Further refactor ram_save_target_page() function to conflate save_zero_page() calls. - https://lore.kernel.org/qemu-devel/20241126115748.118683-1-ppandit@redha= t.com/T/#u v0: - https://lore.kernel.org/qemu-devel/20241029150908.1136894-1-ppandit@redh= at.com/T/#u diff --git a/migration/ram.c b/migration/ram.c index 05ff9eb328..5f97dda5f1 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -467,13 +467,6 @@ void ram_transferred_add(uint64_t bytes) } } =20 -struct MigrationOps { - int (*ram_save_target_page)(RAMState *rs, PageSearchStatus *pss); -}; -typedef struct MigrationOps MigrationOps; - -MigrationOps *migration_ops; - static int ram_save_host_page_urgent(PageSearchStatus *pss); =20 /* NOTE: page is the PFN not real ram_addr_t. */ @@ -1986,55 +1979,36 @@ int ram_save_queue_pages(const char *rbname, ram_ad= dr_t start, ram_addr_t len, } =20 /** - * ram_save_target_page_legacy: save one target page - * - * Returns the number of pages written + * ram_save_target_page: save one target page to the precopy thread + * OR to multifd workers. * * @rs: current RAM state * @pss: data about the page we want to send */ -static int ram_save_target_page_legacy(RAMState *rs, PageSearchStatus *pss) +static int ram_save_target_page(RAMState *rs, PageSearchStatus *pss) { ram_addr_t offset =3D ((ram_addr_t)pss->page) << TARGET_PAGE_BITS; int res; =20 + if (!migrate_multifd() + || migrate_zero_page_detection() =3D=3D ZERO_PAGE_DETECTION_LEGACY= ) { + if (save_zero_page(rs, pss, offset)) { + return 1; + } + } + + if (migrate_multifd()) { + RAMBlock *block =3D pss->block; + return ram_save_multifd_page(block, offset); + } + if (control_save_page(pss, offset, &res)) { return res; } =20 - if (save_zero_page(rs, pss, offset)) { - return 1; - } - return ram_save_page(rs, pss); } =20 -/** - * ram_save_target_page_multifd: send one target page to multifd workers - * - * Returns 1 if the page was queued, -1 otherwise. - * - * @rs: current RAM state - * @pss: data about the page we want to send - */ -static int ram_save_target_page_multifd(RAMState *rs, PageSearchStatus *ps= s) -{ - RAMBlock *block =3D pss->block; - ram_addr_t offset =3D ((ram_addr_t)pss->page) << TARGET_PAGE_BITS; - - /* - * While using multifd live migration, we still need to handle zero - * page checking on the migration main thread. - */ - if (migrate_zero_page_detection() =3D=3D ZERO_PAGE_DETECTION_LEGACY) { - if (save_zero_page(rs, pss, offset)) { - return 1; - } - } - - return ram_save_multifd_page(block, offset); -} - /* Should be called before sending a host page */ static void pss_host_page_prepare(PageSearchStatus *pss) { @@ -2121,7 +2095,7 @@ static int ram_save_host_page_urgent(PageSearchStatus= *pss) =20 if (page_dirty) { /* Be strict to return code; it must be 1, or what else? */ - if (migration_ops->ram_save_target_page(rs, pss) !=3D 1) { + if (ram_save_target_page(rs, pss) !=3D 1) { error_report_once("%s: ram_save_target_page failed", __fun= c__); ret =3D -1; goto out; @@ -2190,7 +2164,7 @@ static int ram_save_host_page(RAMState *rs, PageSearc= hStatus *pss) if (preempt_active) { qemu_mutex_unlock(&rs->bitmap_mutex); } - tmppages =3D migration_ops->ram_save_target_page(rs, pss); + tmppages =3D ram_save_target_page(rs, pss); if (tmppages >=3D 0) { pages +=3D tmppages; /* @@ -2388,8 +2362,6 @@ static void ram_save_cleanup(void *opaque) xbzrle_cleanup(); multifd_ram_save_cleanup(); ram_state_cleanup(rsp); - g_free(migration_ops); - migration_ops =3D NULL; } =20 static void ram_state_reset(RAMState *rs) @@ -3055,13 +3027,8 @@ static int ram_save_setup(QEMUFile *f, void *opaque,= Error **errp) return ret; } =20 - migration_ops =3D g_malloc0(sizeof(MigrationOps)); - if (migrate_multifd()) { multifd_ram_save_setup(); - migration_ops->ram_save_target_page =3D ram_save_target_page_multi= fd; - } else { - migration_ops->ram_save_target_page =3D ram_save_target_page_legac= y; } =20 bql_unlock(); --=20 2.47.1 From nobody Thu Dec 26 14:30:06 2024 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=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1732883071; cv=none; d=zohomail.com; s=zohoarc; b=SGUoXoNIprQXcmvMS2TM2fja0j4UJXnkLH8qvXzKtAcWtgQDNsnVemIXlhtFDo1Z4bz1wX5M/jMXnOigJAGflHGGbBxERy2URUwPjXD5/knUl/iyCfnb+wW3vGYjEZ5HJDXX1+DE925i21/rceUyp3hD/wr+xw1ahTKeCe4wDXk= ARC-Message-Signature: i=1; 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charset="utf-8" From: Prasad Pandit Enable Multifd and Postcopy migration together. The migration_ioc_process_incoming() routine checks magic value sent on each channel and helps to properly setup multifd and postcopy channels. The Precopy and Multifd threads work during the initial guest RAM transfer. When migration moves to the Postcopy phase, the multifd threads are restrained and Postcopy threads on the destination request/pull data from the source side. Signed-off-by: Prasad Pandit --- migration/migration.c | 90 +++++++++++++++++++++++--------------- migration/multifd-nocomp.c | 3 +- migration/options.c | 5 --- migration/ram.c | 8 ++-- 4 files changed, 61 insertions(+), 45 deletions(-) v2: Merge earlier options.c patch into this one. Also make !migration_in_postcopy() check in this patch, to separate refactoring change from this one. v1: Avoid using 4-bytes magic value for the Postcopy channel. Flush and synchronise Multifd thread before postcopy_start(). - https://lore.kernel.org/qemu-devel/20241126115748.118683-1-ppandit@redha= t.com/T/#u v0: - https://lore.kernel.org/qemu-devel/20241029150908.1136894-1-ppandit@redh= at.com/T/#u diff --git a/migration/migration.c b/migration/migration.c index 8c5bd0a75c..fa0a6d3b7d 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -92,6 +92,9 @@ enum mig_rp_message_type { MIG_RP_MSG_MAX }; =20 +/* Migration channel types */ +enum { CH_DEFAULT, CH_MULTIFD, CH_POSTCOPY }; + /* When we add fault tolerance, we could have several migrations at once. For now we don't need to add dynamic creation of migration */ @@ -921,26 +924,32 @@ void migration_fd_process_incoming(QEMUFile *f) /* * Returns true when we want to start a new incoming migration process, * false otherwise. + * + * All the required channels must be in place before a new incoming + * migration process starts. + * - Multifd enabled: + * The main channel and the multifd channels are required. + * - Multifd/Postcopy disabled: + * The main channel is required. + * - Postcopy enabled: + * We don't want to start a new incoming migration when + * the postcopy channel is created. Because it is created + * towards the end of the precopy migration. */ -static bool migration_should_start_incoming(bool main_channel) +static bool migration_should_start_incoming(uint8_t channel) { - /* Multifd doesn't start unless all channels are established */ - if (migrate_multifd()) { - return migration_has_all_channels(); - } + bool ret =3D false; + + if (channel !=3D CH_POSTCOPY) { + MigrationIncomingState *mis =3D migration_incoming_get_current(); + ret =3D mis->from_src_file ? true : false; =20 - /* Preempt channel only starts when the main channel is created */ - if (migrate_postcopy_preempt()) { - return main_channel; + if (ret && migrate_multifd()) { + ret =3D multifd_recv_all_channels_created(); + } } =20 - /* - * For all the rest types of migration, we should only reach here when - * it's the main channel that's being created, and we should always - * proceed with this channel. - */ - assert(main_channel); - return true; + return ret; } =20 void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp) @@ -948,13 +957,12 @@ void migration_ioc_process_incoming(QIOChannel *ioc, = Error **errp) MigrationIncomingState *mis =3D migration_incoming_get_current(); Error *local_err =3D NULL; QEMUFile *f; - bool default_channel =3D true; uint32_t channel_magic =3D 0; + uint8_t channel =3D CH_DEFAULT; int ret =3D 0; =20 - if (migrate_multifd() && !migrate_mapped_ram() && - !migrate_postcopy_ram() && - qio_channel_has_feature(ioc, QIO_CHANNEL_FEATURE_READ_MSG_PEEK)) { + if (!migration_should_start_incoming(channel) + && qio_channel_has_feature(ioc, QIO_CHANNEL_FEATURE_READ_MSG_PEEK)= ) { /* * With multiple channels, it is possible that we receive channels * out of order on destination side, causing incorrect mapping of @@ -972,35 +980,46 @@ void migration_ioc_process_incoming(QIOChannel *ioc, = Error **errp) return; } =20 - default_channel =3D (channel_magic =3D=3D cpu_to_be32(QEMU_VM_FILE= _MAGIC)); + if (channel_magic =3D=3D cpu_to_be32(QEMU_VM_FILE_MAGIC)) { + channel =3D CH_DEFAULT; + } else if (channel_magic =3D=3D cpu_to_be32(MULTIFD_MAGIC)) { + channel =3D CH_MULTIFD; + } else { + error_report("%s: could not identify channel, unknown magic: %= u", + __func__, channel_magic); + return; + } + } else { - default_channel =3D !mis->from_src_file; + channel =3D CH_POSTCOPY; } =20 if (multifd_recv_setup(errp) !=3D 0) { return; } =20 - if (default_channel) { + if (channel =3D=3D CH_DEFAULT) { f =3D qemu_file_new_input(ioc); migration_incoming_setup(f); - } else { + } else if (channel =3D=3D CH_MULTIFD) { /* Multiple connections */ - assert(migration_needs_multiple_sockets()); if (migrate_multifd()) { multifd_recv_new_channel(ioc, &local_err); - } else { + } + if (local_err) { + error_propagate(errp, local_err); + return; + } + } else if (channel =3D=3D CH_POSTCOPY) { + if (migrate_postcopy()) { assert(migrate_postcopy_preempt()); + assert(!mis->postcopy_qemufile_dst); f =3D qemu_file_new_input(ioc); postcopy_preempt_new_channel(mis, f); } - if (local_err) { - error_propagate(errp, local_err); - return; - } } =20 - if (migration_should_start_incoming(default_channel)) { + if (migration_should_start_incoming(channel)) { /* If it's a recovery, we're done */ if (postcopy_try_recover()) { return; @@ -1017,21 +1036,22 @@ void migration_ioc_process_incoming(QIOChannel *ioc= , Error **errp) */ bool migration_has_all_channels(void) { + bool ret =3D false; MigrationIncomingState *mis =3D migration_incoming_get_current(); =20 if (!mis->from_src_file) { - return false; + return ret; } =20 if (migrate_multifd()) { - return multifd_recv_all_channels_created(); + ret =3D multifd_recv_all_channels_created(); } =20 - if (migrate_postcopy_preempt()) { - return mis->postcopy_qemufile_dst !=3D NULL; + if (ret && migrate_postcopy_preempt()) { + ret =3D mis->postcopy_qemufile_dst !=3D NULL; } =20 - return true; + return ret; } =20 int migrate_send_rp_switchover_ack(MigrationIncomingState *mis) diff --git a/migration/multifd-nocomp.c b/migration/multifd-nocomp.c index 55191152f9..e92821e8f6 100644 --- a/migration/multifd-nocomp.c +++ b/migration/multifd-nocomp.c @@ -14,6 +14,7 @@ #include "exec/ramblock.h" #include "exec/target_page.h" #include "file.h" +#include "migration.h" #include "multifd.h" #include "options.h" #include "qapi/error.h" @@ -345,7 +346,7 @@ retry: =20 int multifd_ram_flush_and_sync(void) { - if (!migrate_multifd()) { + if (!migrate_multifd() || migration_in_postcopy()) { return 0; } =20 diff --git a/migration/options.c b/migration/options.c index ad8d6989a8..c498558a85 100644 --- a/migration/options.c +++ b/migration/options.c @@ -479,11 +479,6 @@ bool migrate_caps_check(bool *old_caps, bool *new_caps= , Error **errp) error_setg(errp, "Postcopy is not compatible with ignore-share= d"); return false; } - - if (new_caps[MIGRATION_CAPABILITY_MULTIFD]) { - error_setg(errp, "Postcopy is not yet compatible with multifd"= ); - return false; - } } =20 if (new_caps[MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT]) { diff --git a/migration/ram.c b/migration/ram.c index 5f97dda5f1..7444fa5280 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -1316,9 +1316,9 @@ static int find_dirty_block(RAMState *rs, PageSearchS= tatus *pss) pss->page =3D 0; pss->block =3D QLIST_NEXT_RCU(pss->block, next); if (!pss->block) { - if (migrate_multifd() && - (!migrate_multifd_flush_after_each_section() || - migrate_mapped_ram())) { + if (migrate_multifd() && !migration_in_postcopy() + && (!migrate_multifd_flush_after_each_section() + || migrate_mapped_ram())) { QEMUFile *f =3D rs->pss[RAM_CHANNEL_PRECOPY].pss_channel; int ret =3D multifd_ram_flush_and_sync(); if (ret < 0) { @@ -1997,7 +1997,7 @@ static int ram_save_target_page(RAMState *rs, PageSea= rchStatus *pss) } } =20 - if (migrate_multifd()) { + if (migrate_multifd() && !migration_in_postcopy()) { RAMBlock *block =3D pss->block; return ram_save_multifd_page(block, offset); } --=20 2.47.1