From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ian Campbell Subject: Re: Question about mapping between domains Date: Fri, 17 Jul 2015 09:59:19 +0100 Message-ID: <1437123559.32371.279.camel@citrix.com> References: <1436448706-2687-1-git-send-email-oleksandr.dmytryshyn@globallogic.com> <1436778275.7019.32.camel@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Oleksandr Dmytryshyn Cc: Keir Fraser , Ian Jackson , Tim Deegan , xen-devel , Stefano Stabellini , Jan Beulich List-Id: xen-devel@lists.xenproject.org On Fri, 2015-07-17 at 10:43 +0300, Oleksandr Dmytryshyn wrote: > Hi, Ian. Thank You for tips. > > On Mon, Jul 13, 2015 at 12:04 PM, Ian Campbell wrote: > > There is an additional quirk for a 1:1 mapped dom0 which is that we > > don't actually decrease reservation when ballooning, but keep the 1:1 > > mfn in anticipation of ballooning it back in later. > Currently we have this quirk enabled in DomD (driver domain) > > > If you can't arrange to use already ballooned buffers for your DMA > > buffer then you will need to manually balloon it out before and balloon > > it back in later. > I've tried this and all is working (I can map and then unmap memory in both > directions DomU -> DomD, DomD -> DomU) > > > You may also want to extend the dom0 1:1 quirk described above to your > > 1:1 mapped domD. > Currently this quirk is enabled in DomD. In this case I can map memory from > DomU to DomD (as it done in all PV drivers). But is this quirk is ^if? > enabled in DomU, I can also map memory from DomD to DomU. Does this mean everything is working as you need, or is there a further issue which needs addressing? Ian.