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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1762194818; 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=Iwv9Ne8VGwdQgfdYohuZ2aslPMNYDvxBjP8G9NMIogM=; b=DzRkooAGD/DlhESsQ2r2lOm+THIoP0gbLW560oYUkRzC8AifZX4j9fnMaW0YCnc4jqbdAW t28VZ1PYN0lQp7q3727OvppI1tXSgL8bIA9cV+pbLb1N8LfGtrhV947IFicEkmebXtUBEO FB9bjCCtD4e1rGyxu4iSEPnmWDII5kU= X-MC-Unique: 0QgamVrePFOPAWLrfkxXCg-1 X-Mimecast-MFC-AGG-ID: 0QgamVrePFOPAWLrfkxXCg_1762194814 From: Juraj Marcin To: qemu-devel@nongnu.org Cc: Juraj Marcin , "Dr. David Alan Gilbert" , Fabiano Rosas , Peter Xu , Jiri Denemark Subject: [PATCH v4 4/8] migration: Introduce postcopy incoming setup and cleanup functions Date: Mon, 3 Nov 2025 19:32:53 +0100 Message-ID: <20251103183301.3840862-5-jmarcin@redhat.com> In-Reply-To: <20251103183301.3840862-1-jmarcin@redhat.com> References: <20251103183301.3840862-1-jmarcin@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 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: Juraj Marcin After moving postcopy_ram_listen_thread() to postcopy file, this patch introduces a pair of functions, postcopy_incoming_setup() and postcopy_incoming_cleanup(). These functions encapsulate setup and cleanup of all incoming postcopy resources, postcopy-ram and postcopy listen thread. Furthermore, this patch also renames the postcopy_ram_listen_thread to postcopy_listen_thread, as this thread handles not only postcopy-ram, but also dirty-bitmaps and in the future it could handle other postcopiable devices. Signed-off-by: Juraj Marcin Reviewed-by: Peter Xu --- migration/migration.c | 2 +- migration/postcopy-ram.c | 44 ++++++++++++++++++++++++++++++++++++++-- migration/postcopy-ram.h | 3 ++- migration/savevm.c | 25 ++--------------------- 4 files changed, 47 insertions(+), 27 deletions(-) diff --git a/migration/migration.c b/migration/migration.c index 6e647c7c4a..9a367f717e 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -892,7 +892,7 @@ process_incoming_migration_co(void *opaque) * but managed to complete within the precopy period, we can u= se * the normal exit. */ - postcopy_ram_incoming_cleanup(mis); + postcopy_incoming_cleanup(mis); } else if (ret >=3D 0) { /* * Postcopy was started, cleanup should happen at the end of t= he diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c index 880b11f154..b47c955763 100644 --- a/migration/postcopy-ram.c +++ b/migration/postcopy-ram.c @@ -2083,7 +2083,7 @@ bool postcopy_is_paused(MigrationStatus status) * the input stream, leaving the main thread free to carry on loading the = rest * of the device state (from RAM). */ -void *postcopy_ram_listen_thread(void *opaque) +static void *postcopy_listen_thread(void *opaque) { MigrationIncomingState *mis =3D migration_incoming_get_current(); QEMUFile *f =3D mis->from_src_file; @@ -2149,7 +2149,7 @@ void *postcopy_ram_listen_thread(void *opaque) */ qemu_event_wait(&mis->main_thread_load_event); } - postcopy_ram_incoming_cleanup(mis); + postcopy_incoming_cleanup(mis); =20 if (load_res < 0) { /* @@ -2182,3 +2182,43 @@ void *postcopy_ram_listen_thread(void *opaque) =20 return NULL; } + +int postcopy_incoming_setup(MigrationIncomingState *mis, Error **errp) +{ + /* + * Sensitise RAM - can now generate requests for blocks that don't exi= st + * However, at this point the CPU shouldn't be running, and the IO + * shouldn't be doing anything yet so don't actually expect requests + */ + if (migrate_postcopy_ram()) { + if (postcopy_ram_incoming_setup(mis)) { + postcopy_ram_incoming_cleanup(mis); + error_setg(errp, "Failed to setup incoming postcopy RAM blocks= "); + return -1; + } + } + + trace_loadvm_postcopy_handle_listen("after uffd"); + + if (postcopy_notify(POSTCOPY_NOTIFY_INBOUND_LISTEN, errp)) { + return -1; + } + + mis->have_listen_thread =3D true; + postcopy_thread_create(mis, &mis->listen_thread, + MIGRATION_THREAD_DST_LISTEN, + postcopy_listen_thread, QEMU_THREAD_DETACHED); + + return 0; +} + +int postcopy_incoming_cleanup(MigrationIncomingState *mis) +{ + int rc =3D 0; + + if (migrate_postcopy_ram()) { + rc =3D postcopy_ram_incoming_cleanup(mis); + } + + return rc; +} diff --git a/migration/postcopy-ram.h b/migration/postcopy-ram.h index 3e26db3e6b..a080dd65a7 100644 --- a/migration/postcopy-ram.h +++ b/migration/postcopy-ram.h @@ -199,6 +199,7 @@ bool postcopy_is_paused(MigrationStatus status); void mark_postcopy_blocktime_begin(uintptr_t addr, uint32_t ptid, RAMBlock *rb); =20 -void *postcopy_ram_listen_thread(void *opaque); +int postcopy_incoming_setup(MigrationIncomingState *mis, Error **errp); +int postcopy_incoming_cleanup(MigrationIncomingState *mis); =20 #endif diff --git a/migration/savevm.c b/migration/savevm.c index 2f7ed0db64..01b5a8bfff 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -2113,32 +2113,11 @@ static int loadvm_postcopy_handle_listen(MigrationI= ncomingState *mis, =20 trace_loadvm_postcopy_handle_listen("after discard"); =20 - /* - * Sensitise RAM - can now generate requests for blocks that don't exi= st - * However, at this point the CPU shouldn't be running, and the IO - * shouldn't be doing anything yet so don't actually expect requests - */ - if (migrate_postcopy_ram()) { - if (postcopy_ram_incoming_setup(mis)) { - postcopy_ram_incoming_cleanup(mis); - error_setg(errp, "Failed to setup incoming postcopy RAM blocks= "); - return -1; - } - } + int rc =3D postcopy_incoming_setup(mis, errp); =20 - trace_loadvm_postcopy_handle_listen("after uffd"); - - if (postcopy_notify(POSTCOPY_NOTIFY_INBOUND_LISTEN, errp)) { - return -1; - } - - mis->have_listen_thread =3D true; - postcopy_thread_create(mis, &mis->listen_thread, - MIGRATION_THREAD_DST_LISTEN, - postcopy_ram_listen_thread, QEMU_THREAD_DETACHE= D); trace_loadvm_postcopy_handle_listen("return"); =20 - return 0; + return rc; } =20 static void loadvm_postcopy_handle_run_bh(void *opaque) --=20 2.51.0