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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 F3A05C04AB4 for ; Thu, 16 May 2019 06:32:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BDDCA20848 for ; Thu, 16 May 2019 06:32:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726448AbfEPGcj (ORCPT ); Thu, 16 May 2019 02:32:39 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33102 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726221AbfEPGcj (ORCPT ); Thu, 16 May 2019 02:32:39 -0400 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 mx1.redhat.com (Postfix) with ESMTPS id A69DD64122; Thu, 16 May 2019 06:32:38 +0000 (UTC) Received: from gondolin (ovpn-204-119.brq.redhat.com [10.40.204.119]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4ED5A600C4; Thu, 16 May 2019 06:32:32 +0000 (UTC) Date: Thu, 16 May 2019 08:32:28 +0200 From: Cornelia Huck To: Halil Pasic Cc: "Jason J. Herne" , kvm@vger.kernel.org, linux-s390@vger.kernel.org, Martin Schwidefsky , Sebastian Ott , virtualization@lists.linux-foundation.org, "Michael S. Tsirkin" , Christoph Hellwig , Thomas Huth , Christian Borntraeger , Viktor Mihajlovski , Vasily Gorbik , Janosch Frank , Claudio Imbrenda , Farhan Ali , Eric Farman Subject: Re: [PATCH 06/10] s390/cio: add basic protected virtualization support Message-ID: <20190516083228.0cc5b489.cohuck@redhat.com> In-Reply-To: <20190515230817.2f8a8a5d.pasic@linux.ibm.com> References: <20190426183245.37939-1-pasic@linux.ibm.com> <20190426183245.37939-7-pasic@linux.ibm.com> <20190513114136.783c851c.cohuck@redhat.com> <20190515230817.2f8a8a5d.pasic@linux.ibm.com> Organization: Red Hat GmbH MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Thu, 16 May 2019 06:32:38 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Wed, 15 May 2019 23:08:17 +0200 Halil Pasic wrote: > On Tue, 14 May 2019 10:47:34 -0400 > "Jason J. Herne" wrote: > > Are we > > worried that virtio data structures are going to be a burden on the 31-bit address space? > > > > > > That is a good question I can not answer. Since it is currently at least > a page per queue (because we use dma direct, right Mimu?), I am concerned > about this. > > Connie, what is your opinion? Yes, running into problems there was one of my motivations for my question. I guess it depends on the number of devices and how many queues they use. The problem is that it affects not only protected virt guests, but all guests.