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charset="utf-8" From: Juan Quintela Signed-off-by: Juan Quintela Reviewed-by: Leonardo Bras --- migration/multifd.c | 7 ++++--- migration/options.c | 17 +++++++++-------- migration/ram.c | 45 ++++++++++++++++++++++++++++++++++++++------- qapi/migration.json | 1 - 4 files changed, 51 insertions(+), 19 deletions(-) diff --git a/migration/multifd.c b/migration/multifd.c index 756673029d..eece85569f 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -13,6 +13,7 @@ #include "qemu/osdep.h" #include "qemu/cutils.h" #include "qemu/rcu.h" +#include "qemu/cutils.h" #include "exec/target_page.h" #include "sysemu/sysemu.h" #include "exec/ramblock.h" @@ -459,7 +460,6 @@ static int multifd_send_pages(QEMUFile *f) p->packet_num =3D multifd_send_state->packet_num++; multifd_send_state->pages =3D p->pages; p->pages =3D pages; - qemu_mutex_unlock(&p->mutex); qemu_sem_post(&p->sem); =20 @@ -684,7 +684,7 @@ static void *multifd_send_thread(void *opaque) MigrationThread *thread =3D NULL; Error *local_err =3D NULL; /* qemu older than 8.2 don't understand zero page on multifd channel */ - bool use_zero_page =3D !migrate_use_main_zero_page(); + bool use_multifd_zero_page =3D !migrate_use_main_zero_page(); int ret =3D 0; bool use_zero_copy_send =3D migrate_zero_copy_send(); =20 @@ -713,6 +713,7 @@ static void *multifd_send_thread(void *opaque) RAMBlock *rb =3D p->pages->block; uint64_t packet_num =3D p->packet_num; uint32_t flags; + p->normal_num =3D 0; p->zero_num =3D 0; =20 @@ -724,7 +725,7 @@ static void *multifd_send_thread(void *opaque) =20 for (int i =3D 0; i < p->pages->num; i++) { uint64_t offset =3D p->pages->offset[i]; - if (use_zero_page && + if (use_multifd_zero_page && buffer_is_zero(rb->host + offset, p->page_size)) { p->zero[p->zero_num] =3D offset; p->zero_num++; diff --git a/migration/options.c b/migration/options.c index 0f6bd78b9f..180698a8f5 100644 --- a/migration/options.c +++ b/migration/options.c @@ -195,6 +195,8 @@ Property migration_properties[] =3D { DEFINE_PROP_MIG_CAP("x-block", MIGRATION_CAPABILITY_BLOCK), DEFINE_PROP_MIG_CAP("x-return-path", MIGRATION_CAPABILITY_RETURN_PATH), DEFINE_PROP_MIG_CAP("x-multifd", MIGRATION_CAPABILITY_MULTIFD), + DEFINE_PROP_MIG_CAP("x-main-zero-page", + MIGRATION_CAPABILITY_MAIN_ZERO_PAGE), DEFINE_PROP_MIG_CAP("x-background-snapshot", MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT), #ifdef CONFIG_LINUX @@ -288,15 +290,9 @@ bool migrate_multifd(void) =20 bool migrate_use_main_zero_page(void) { - /* MigrationState *s; */ - - /* s =3D migrate_get_current(); */ + MigrationState *s =3D migrate_get_current(); =20 - /* - * We will enable this when we add the right code. - * return s->enabled_capabilities[MIGRATION_CAPABILITY_MAIN_ZERO_PAGE]; - */ - return true; + return s->capabilities[MIGRATION_CAPABILITY_MAIN_ZERO_PAGE]; } =20 bool migrate_pause_before_switchover(void) @@ -459,6 +455,7 @@ INITIALIZE_MIGRATE_CAPS_SET(check_caps_background_snaps= hot, MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE, MIGRATION_CAPABILITY_RETURN_PATH, MIGRATION_CAPABILITY_MULTIFD, + MIGRATION_CAPABILITY_MAIN_ZERO_PAGE, MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER, MIGRATION_CAPABILITY_AUTO_CONVERGE, MIGRATION_CAPABILITY_RELEASE_RAM, @@ -536,6 +533,10 @@ bool migrate_caps_check(bool *old_caps, bool *new_caps= , Error **errp) error_setg(errp, "Postcopy is not yet compatible with multifd"= ); return false; } + if (new_caps[MIGRATION_CAPABILITY_MAIN_ZERO_PAGE]) { + error_setg(errp, + "Postcopy is not yet compatible with main zero copy"); + } } =20 if (new_caps[MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT]) { diff --git a/migration/ram.c b/migration/ram.c index 8c7886ab79..f7a42feff2 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -2059,17 +2059,42 @@ static int ram_save_target_page_legacy(RAMState *rs= , PageSearchStatus *pss) if (save_zero_page(rs, pss, offset)) { return 1; } - /* - * Do not use multifd in postcopy as one whole host page should be - * placed. Meanwhile postcopy requires atomic update of pages, so even - * if host page size =3D=3D guest page size the dest guest during run = may - * still see partially copied pages which is data corruption. + * Do not use multifd for: + * 1. Compression as the first page in the new block should be posted = out + * before sending the compressed page + * 2. In postcopy as one whole host page should be placed */ - if (migrate_multifd() && !migration_in_postcopy()) { + if (!migrate_compress() && migrate_multifd() && !migration_in_postcopy= ()) { + return ram_save_multifd_page(pss->pss_channel, block, offset); + } + + return ram_save_page(rs, pss); +} + +/** + * ram_save_target_page_multifd: save one target page + * + * Returns the number of pages written + * + * @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; + int res; + + if (!migration_in_postcopy()) { return ram_save_multifd_page(pss->pss_channel, block, offset); } =20 + res =3D save_zero_page(rs, pss, offset); + if (res > 0) { + return res; + } + return ram_save_page(rs, pss); } =20 @@ -2982,9 +3007,15 @@ static int ram_save_setup(QEMUFile *f, void *opaque) } =20 migration_ops =3D g_malloc0(sizeof(MigrationOps)); - migration_ops->ram_save_target_page =3D ram_save_target_page_legacy; + + if (migrate_multifd() && !migrate_use_main_zero_page()) { + 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 qemu_mutex_unlock_iothread(); + ret =3D multifd_send_sync_main(f); qemu_mutex_lock_iothread(); if (ret < 0) { diff --git a/qapi/migration.json b/qapi/migration.json index 80c4b13516..4c7a42e364 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -531,7 +531,6 @@ # and can result in more stable read performance. Requires KVM # with accelerator property "dirty-ring-size" set. (Since 8.1) # -# # @main-zero-page: If enabled, the detection of zero pages will be # done on the main thread. Otherwise it is done on # the multifd threads. --=20 2.30.2