From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50536) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ehHmB-0007hq-Uh for qemu-devel@nongnu.org; Thu, 01 Feb 2018 11:31:52 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ehHm6-000678-D1 for qemu-devel@nongnu.org; Thu, 01 Feb 2018 11:31:51 -0500 Received: from mx1.redhat.com ([209.132.183.28]:44805) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ehHm6-00065O-7I for qemu-devel@nongnu.org; Thu, 01 Feb 2018 11:31:46 -0500 Date: Thu, 1 Feb 2018 14:31:32 -0200 From: Eduardo Habkost Message-ID: <20180201163132.GV26425@localhost.localdomain> References: <20180117095421.124787-1-marcel@redhat.com> <20180117095421.124787-2-marcel@redhat.com> <20180131204059.GG21702@localhost.localdomain> <20180131230607-mutt-send-email-mst@kernel.org> <20180131233422.GP26425@localhost.localdomain> <20180201040608-mutt-send-email-mst@kernel.org> <8dbc7c99-84f6-0023-526b-359fdf2b5162@redhat.com> <20180201121009.GR26425@localhost.localdomain> <20180201150254-mutt-send-email-mst@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180201150254-mutt-send-email-mst@kernel.org> Subject: Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Michael S. Tsirkin" Cc: Marcel Apfelbaum , qemu-devel@nongnu.org, cohuck@redhat.com, f4bug@amsat.org, yuval.shaia@oracle.com, borntraeger@de.ibm.com, pbonzini@redhat.com, imammedo@redhat.com On Thu, Feb 01, 2018 at 04:24:30PM +0200, Michael S. Tsirkin wrote: [...] > The full fix would be to allow QEMU to map a list of > pages to a guest supplied IOVA. Thanks, that's what I expected. While this is not possible, the only requests I have for this patch is that we clearly document: * What's the only purpose of share=on on a host-memory-backend object (due to pvrdma limitations). * The potential undesirable side-effects of setting share=on. * On the commit message and other comments, clearly distinguish HVAs in the QEMU address-space from IOVAs, to avoid confusion. -- Eduardo