From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?ISO-8859-1?Q?Roger_Pau_Monn=E9?= Subject: Re: blktap3 as a block device? Date: Mon, 26 Nov 2012 12:48:11 +0100 Message-ID: <50B356FB.70601@citrix.com> References: <1353926705.5830.9.camel@zakaz.uk.xensource.com> <4B45B535F7F6BE4CB1C044ED5115CDDE012D552FE2E3@LONPMAILBOX01.citrite.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4B45B535F7F6BE4CB1C044ED5115CDDE012D552FE2E3@LONPMAILBOX01.citrite.net> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Thanos Makatos Cc: Darren Shepherd , "Fajar A. Nugraha" , Ian Campbell , "xen-devel@lists.xen.org" List-Id: xen-devel@lists.xenproject.org On 26/11/12 11:54, Thanos Makatos wrote: > > >> -----Original Message----- >> From: Ian Campbell >> Sent: 26 November 2012 10:45 >> To: Darren Shepherd >> Cc: Fajar A. Nugraha; xen-devel@lists.xen.org; Thanos Makatos >> Subject: Re: [Xen-devel] blktap3 as a block device? >> >> On Sat, 2012-11-24 at 01:08 +0000, Darren Shepherd wrote: >>> The more direct question is going forward with blktap3 is there going >>> to be a way to see the blktap device as a block device in dom0? >> >> There will have to be, e.g. to support pygrub and similar uses. >> >> I'm not sure what form this will eventually take though (CCing Thanos, >> blktap3 maintainer). Ideas which I've heard floating about are to have >> tapdisk export an nbd server or supporting running a vbd device in dom0 >> in a loopback type mode. > > Yes this is one of the possibilities; this functionality is already on blktap2.5 (where blktap3 is based on). > > Another idea could be to use both blkfront and tapdisk on dom0, haven't considered that thoroughly though. >>From my point of view using blkfront on Dom0 should be used instead of nbd. nbd is Linux specific, on the other hand all Dom0s have a blkfront implementation.