From nobody Mon Feb 9 20:10:58 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; 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=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1637749817738302.77442170481595; Wed, 24 Nov 2021 02:30:17 -0800 (PST) Received: from localhost ([::1]:54618 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mppXb-0006TU-DD for importer@patchew.org; Wed, 24 Nov 2021 05:30:15 -0500 Received: from eggs.gnu.org ([209.51.188.92]:42586) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mppCo-0003bQ-Rj for qemu-devel@nongnu.org; Wed, 24 Nov 2021 05:08:46 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:39923) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mppCm-0007US-ME for qemu-devel@nongnu.org; Wed, 24 Nov 2021 05:08:46 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-597-8bcAsEgYNCmCFEBJqMUJzg-1; Wed, 24 Nov 2021 05:08:42 -0500 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 0CA8F192AB6D for ; Wed, 24 Nov 2021 10:08:42 +0000 (UTC) Received: from redhat.mitica.com (unknown [10.39.193.24]) by smtp.corp.redhat.com (Postfix) with ESMTP id A2BAB60843; Wed, 24 Nov 2021 10:08:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1637748524; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=KHmXpk+ZVRbhpA6PDwrLC0W/S4sg8OR0VfUtrYBV4JY=; b=W4au+Q/N7iAnVRue18PVnr6s5WvwQwnIAjb0CHxQ/+kE+R5Moertv+FYC96eOB59NVUK3N CW7Wwcxpd7jTE8rod/pbg/JAnCdwjC0AlBDJGBBntKSaDLIqZTwFz/P++XVQ0FZuc3PgvY W4zsRf7C8N0iMaMsX4Jhj+BTHFLb/Bs= X-MC-Unique: 8bcAsEgYNCmCFEBJqMUJzg-1 From: Juan Quintela To: qemu-devel@nongnu.org Subject: [PATCH v3 22/23] multifd: Zero pages transmission Date: Wed, 24 Nov 2021 11:06:16 +0100 Message-Id: <20211124100617.19786-23-quintela@redhat.com> In-Reply-To: <20211124100617.19786-1-quintela@redhat.com> References: <20211124100617.19786-1-quintela@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=quintela@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com 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=170.10.129.124; envelope-from=quintela@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.7, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, 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: , Cc: Leonardo Bras , "Dr. David Alan Gilbert" , Peter Xu , Juan Quintela Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1637749819689100001 Content-Type: text/plain; charset="utf-8" This implements the zero page dection and handling. Signed-off-by: Juan Quintela Reviewed-by: Dr. David Alan Gilbert --- migration/multifd.c | 33 +++++++++++++++++++++++++++++++-- 1 file changed, 31 insertions(+), 2 deletions(-) diff --git a/migration/multifd.c b/migration/multifd.c index 2e4dffd6c6..5c1fc70ce3 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -11,6 +11,7 @@ */ =20 #include "qemu/osdep.h" +#include "qemu/cutils.h" #include "qemu/rcu.h" #include "exec/target_page.h" #include "sysemu/sysemu.h" @@ -277,6 +278,12 @@ static void multifd_send_fill_packet(MultiFDSendParams= *p) =20 packet->offset[i] =3D cpu_to_be64(temp); } + for (i =3D 0; i < p->zero_num; i++) { + /* there are architectures where ram_addr_t is 32 bit */ + uint64_t temp =3D p->zero[i]; + + packet->offset[p->normal_num + i] =3D cpu_to_be64(temp); + } } =20 static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) @@ -362,6 +369,18 @@ static int multifd_recv_unfill_packet(MultiFDRecvParam= s *p, Error **errp) p->normal[i] =3D offset; } =20 + for (i =3D 0; i < p->zero_num; i++) { + uint64_t offset =3D be64_to_cpu(packet->offset[p->normal_num + i]); + + if (offset > (block->used_length - page_size)) { + error_setg(errp, "multifd: offset too long %" PRIu64 + " (max " RAM_ADDR_FMT ")", + offset, block->used_length); + return -1; + } + p->zero[i] =3D offset; + } + return 0; } =20 @@ -652,8 +671,14 @@ static void *multifd_send_thread(void *opaque) p->zero_num =3D 0; =20 for (int i =3D 0; i < p->pages->num; i++) { - p->normal[p->normal_num] =3D p->pages->offset[i]; - p->normal_num++; + if (buffer_is_zero(p->pages->block->host + p->pages->offse= t[i], + qemu_target_page_size())) { + p->zero[p->zero_num] =3D p->pages->offset[i]; + p->zero_num++; + } else { + p->normal[p->normal_num] =3D p->pages->offset[i]; + p->normal_num++; + } } =20 if (p->normal_num) { @@ -1112,6 +1137,10 @@ static void *multifd_recv_thread(void *opaque) } } =20 + for (int i =3D 0; i < p->zero_num; i++) { + memset(p->host + p->zero[i], 0, qemu_target_page_size()); + } + if (flags & MULTIFD_FLAG_SYNC) { qemu_sem_post(&multifd_recv_state->sem_sync); qemu_sem_wait(&p->sem_sync); --=20 2.33.1