From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BD2D2C432C0 for ; Thu, 28 Nov 2019 20:26:52 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 878AF216F4 for ; Thu, 28 Nov 2019 20:26:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="eE1hhgc0" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 878AF216F4 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:53022 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iaQNH-0004Wt-Kl for qemu-devel@archiver.kernel.org; Thu, 28 Nov 2019 15:26:51 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:51137) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iaNJ1-0005ZH-0a for qemu-devel@nongnu.org; Thu, 28 Nov 2019 12:10:19 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iaN8w-0006Kw-SY for qemu-devel@nongnu.org; Thu, 28 Nov 2019 11:59:52 -0500 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:35729 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iaN8w-00067K-Ns for qemu-devel@nongnu.org; Thu, 28 Nov 2019 11:59:50 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1574960387; 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=z+gKnFB7aqsHGDTDcrp/7FHk0vxbPnXuLjkksK8oJRE=; b=eE1hhgc0oSdo2T83IVUnYn3MSXDB6bv9kkUN3S/lmm8Aqm5N1mnwz1CTL9nqLeLz2UdWie GAq/8ujoWfqe2r4FZrJUR/KkFc52Ogji504JE5n0m8QXl0JreHLshhPNyYXqrO5rKzILPu pxzxH35PxrKG0HWctYbLolYHA636bTs= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-164-bjzBHTW0ONePu8hU5Zwe-g-1; Thu, 28 Nov 2019 11:59:43 -0500 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B0CE0911A3; Thu, 28 Nov 2019 16:59:42 +0000 (UTC) Received: from work-vm (unknown [10.36.118.89]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 71C13600C8; Thu, 28 Nov 2019 16:59:35 +0000 (UTC) Date: Thu, 28 Nov 2019 16:59:33 +0000 From: "Dr. David Alan Gilbert" To: =?iso-8859-1?Q?Marc-Andr=E9?= Lureau , imammedo@redhat.com Subject: Re: [PATCH 0/2] RFC: add -mem-shared option Message-ID: <20191128165933.GB3295@work-vm> References: <20191128141518.628245-1-marcandre.lureau@redhat.com> MIME-Version: 1.0 In-Reply-To: <20191128141518.628245-1-marcandre.lureau@redhat.com> User-Agent: Mutt/1.12.1 (2019-06-15) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-MC-Unique: bjzBHTW0ONePu8hU5Zwe-g-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 205.139.110.61 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , Richard Henderson , qemu-devel@nongnu.org, stefanha@redhat.com, Eduardo Habkost Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" * Marc-Andr=E9 Lureau (marcandre.lureau@redhat.com) wrote: > Hi, >=20 > Setting up shared memory for vhost-user is a bit complicated from > command line, as it requires NUMA setup such as: m 4G -object > memory-backend-file,id=3Dmem,size=3D4G,mem-path=3D/dev/shm,share=3Don -nu= ma > node,memdev=3Dmem. >=20 > Instead, I suggest to add a -mem-shared option for non-numa setups, > that will make the -mem-path or anonymouse memory shareable. >=20 > Comments welcome, It's worth checking with Igor (cc'd) - he said he was going to work on something similar. One other thing this fixes is that it lets you potentially do vhost-user on s390, since it currently has no NUMA. Dave > Marc-Andr=E9 Lureau (2): > memfd: add qemu_memfd_open() > Add -mem-shared option >=20 > exec.c | 11 ++++++++++- > hw/core/numa.c | 16 +++++++++++++++- > include/qemu/memfd.h | 3 +++ > include/sysemu/sysemu.h | 1 + > qemu-options.hx | 10 ++++++++++ > util/memfd.c | 39 +++++++++++++++++++++++++-------------- > vl.c | 4 ++++ > 7 files changed, 68 insertions(+), 16 deletions(-) >=20 > --=20 > 2.24.0 >=20 >=20 -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK