From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Byrne Subject: Re: Live migration leaves page tables read-only? Date: Tue, 28 Nov 2006 16:22:52 -0800 Message-ID: <456CD2DC.2020201@hp.com> References: <456CD0A5.1060701@hp.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <456CD0A5.1060701@hp.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: xen-devel List-Id: xen-devel@lists.xenproject.org I forgot to mention that a very simple test case I wrote using shared memory and the mprotect call didn't fail. So, the only test case I have at the moment is to run SAP. John Byrne John Byrne wrote: > > I have been trying to debug a problem live-migrating SAP on Xen-3.0.3 > x86-64 (I also tested Xen-unstable changeset 12548) without success. > > SAP seems to run fine on a given host; live-migrating it to another host > causes the guest to almost immediately panic in the mprotect() call in > the change_pte_range() routine in the set_pte_at() macro because the > page table page it is trying to update is write-protected. > > My attempts at understanding where this is coming from have come to > naught. Any help in running this down would be appreciated. I am > perfectly willing/able to write some debugging code if I am given a few > clues what to look for. > > Thanks, > > John Byrne > > > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel >