From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pasi =?iso-8859-1?Q?K=E4rkk=E4inen?= Subject: Re: rhel6 guest fail to do save? Date: Thu, 13 Jan 2011 23:45:26 +0200 Message-ID: <20110113214526.GS2754@reaktio.net> References: <749B9D3DBF0F054390025D9EAFF47F2231AFC4CB@shsmsx501.ccr.corp.intel.com> <20110112073727.GJ2754@reaktio.net> <749B9D3DBF0F054390025D9EAFF47F2231AFC752@shsmsx501.ccr.corp.intel.com> <19757.57820.217472.22989@mariner.uk.xensource.com> <1294904162.12280.93.camel@localhost.localdomain> <20110113074726.GM2754@reaktio.net> <4D2F6D1C.9070905@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Return-path: Content-Disposition: inline In-Reply-To: <4D2F6D1C.9070905@redhat.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: Don Dutile Cc: "Zhang, Yang Z" , "xen-devel@lists.xensource.com" , Ian Jackson , Ian Campbell List-Id: xen-devel@lists.xenproject.org On Thu, Jan 13, 2011 at 04:22:36PM -0500, Don Dutile wrote: > Pasi K=E4rkk=E4inen wrote: > > On Thu, Jan 13, 2011 at 07:36:02AM +0000, Ian Campbell wrote: > >> On Wed, 2011-01-12 at 17:16 +0000, Ian Jackson wrote:=20 > >>> Zhang, Yang Z writes ("RE: [Xen-devel] rhel6 guest fail to do save?= "): > >>>> From: Pasi K=E4rkk=E4inen [mailto:pasik@iki.fi] > >>>>> I think people have generally been able to save/restore with rhel= 6, > >>>>> but there are some issues with live migration between different M= Hz CPUs, > >>>>> for example: https://bugzilla.redhat.com/show_bug.cgi?id=3D663755 > >>> ... > >>>> Sorry, I mean the HVM. > >>> This is known not to work. It fails in my automatic tests. > >>> > >>> The current RHEL6 kernel has enough pv-on-hvm drivers to get the > >>> toolstack to try to negotiate with the guest during save, but not > >>> enough (or not working enough) drivers to actually complete the > >>> negotiation. So the toolstack times out and the migrate/save fails= . > >> Does any of the pv-on-hvm functionality work at all in RHEL6? > >> > >> Perhaps setting "platform_pci =3D 0" in the guest configuration woul= d work > >> around this issue? In particular if RHEL6 has no useful pv-on-hvm > >> functionality in the first place then nothing is lost. > >> > >=20 > > RHEL6 is supposed to have working PV-on-HVM drivers, > > based on Stefano's patches. > >=20 > > Redhat has tested them with RHEL5 dom0, afaik. > >=20 > Correct. xen-emul-unplug doesn't work, though, due to late > patch that broke that bit of it. > A fair number of upstream patches for pv-hvm & save/restore > have been backported to the next rhel6 update, so hoping this > state of missing pieces in rhel6 pv-on-hvm will be short-lived. > oh, added benefit: the patches should improve rhel6 (pv-on)hvm > on non-RHEL5 dom0's as well. >=20 Great! Thanks for the reply! -- Pasi