From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pasi =?iso-8859-1?Q?K=E4rkk=E4inen?= Subject: Re: Xen max supported memory per guest VM? Date: Mon, 16 Aug 2010 12:34:57 +0300 Message-ID: <20100816093457.GA2804@reaktio.net> References: <4C691B3E020000780000FFCF@vpn.id2.novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline 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: "xen-devel@lists.xensource.com" , Jan Beulich List-Id: xen-devel@lists.xenproject.org On Mon, Aug 16, 2010 at 10:18:53AM +0100, Keir Fraser wrote: > On 16/08/2010 10:04, "Jan Beulich" wrote: > > >>> But what's the max supported amount of memory for a (64bit) guest? > >> > >> Allocating the whole 1TB should work. It's unlikely to have been tested > >> though. > > > > Not everything will work with more than 512G: Anything that wants > > to access the guest's pfn_to_mfn_frame_list_list won't work, as > > there's no specification of how more than a page worth of these top > > level pointers should be expressed. Affected would be (afaict) save/ > > restore/migrate, kexec, and dumping of a crashed guest. > > Okay, so that's a further restriction on PV guests. HVM guests should > theoretically still be good up to 1TB. > Ok, I updated this info to: http://wiki.xensource.com/xenwiki/Xen4.0 -- Pasi