From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joshua West Subject: Re: Migrate/Save of 32-bit domU Broken on Xen 3.1.2 64-bit dom0 Date: Fri, 18 Jan 2008 18:05:57 -0500 Message-ID: <479130D5.1060009@brandeis.edu> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Keir Fraser Cc: Kurt Hackel , xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org Dang, doesn't work in Xen 3.1.3-rc1 (like you said/expected), with or without Kurt's patches. Hmm... I thought 32-bit paravirtualized domU's on 64-bit dom0's were supported in Xen 3.1.x? Or am I mistaken? Perhaps standard features such as start/shutdown/pause of 32-bit PV domU's on 64-bit dom0's are supported, but not the more advanced management features like save and migrate - and I was just unclear from the beginning? And of course... the final question that all developers hate... when s/could one _hope_ (not expect!) to see save/migrate functionality of 32-bit PV domU's on 64-bit dom0's? :-D Our whole reason for moving to 64-bit dom0's was to utilize 32GB of memory, instead of the 16GB limitation on 32-bit PAE dom0's. We can't convert all of our virtual machines (100+) to 64-bit linux as its too much work and some actually have to be 32-bit due to vendor supplied software (Oracle, Zimbra, etc). I suppose we'll wait to move to 64-bit until [live] migration is available, as its used quite frequently in our machine rooms. Thanks for all of your help Keir and Kurt. Keir Fraser wrote: > Looking at the issues that need to be handled to support this, it cannot be > expected to work. > > -- Keir > > On 18/1/08 22:13, "Joshua West" wrote: > > >> Ahh. Well, I'm building xen-3.1.3-rc1 right now and I'll see how that goes. >> >> Keir, have you seen this issue before? Where one cannot xm save/migrate >> a 32-bit domU on a 64-bit dom0? Or is this expected to work and just >> doesn't go well for me? >> >> Keir Fraser wrote: >> >>> On 18/1/08 22:05, "Joshua West" wrote: >>> >>> >>> >>>> Just to make sure the patches aren't the cause of this new error >>>> message, I'm going to see what happens with Xen 3.1.3-rc1 w/o patches. >>>> >>>> Kurt, Keir, everybody else... any ideas as to why "xm save" (and thus >>>> "xm migrate") of 32-bit domU's does not work on 64-bit dom0's? Has >>>> anybody found this to be successful in the past? >>>> >>>> >>> The extent of the patches that Kurt posted indicate its pretty unlikely to >>> work without considerable code modification. I guess those patches aren't >>> quite fully baked yet, unfortunately, or haven't been written with your >>> precise case in mind. >>> >>> -- Keir >>> >>> >>> >>> > > > -- Joshua West Systems Engineer Brandeis University http://www.brandeis.edu