Re: [Xen-devel] Please review the key 4.4 release docs

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

On 03/14/2014 05:24 PM, George Dunlap wrote:
> On 03/11/2014 01:23 AM, Zhang, Yang Z wrote:
> > George Dunlap wrote on 2014-03-10:
> > > On 03/10/2014 04:27 AM, Zhang, Yang Z wrote:
> > > > Russell Pavlicek wrote on 2014-03-10:
> > > > > I have done my best to compile the various key release documents
> > > > > for the 4.4 release.
> > > > >
> > > > > All have hyperlinks from the download page:
> > > > > http://www.xenproject.org/downloads/xen-archives/supported-xen-44-s
> > > > > er
> > > > > i
> > > > > es/ xen-440.html
> > > > I thought that we have agreed that we will move the nested
> > > > virtualization
> > > from experimental to 1.0 or something else in Xen 4.4 release note.
> > > But it seems it still in experimental state and there is no mention of
> > > it in the release note.
> > >
> > > Well we discussed it, but there were too many things still missing to
> > > call it a properly supported feature: in particular, doubts about how
> > > well shadow-on-hap would work, which would be a potential security
> > Actually, I'd like to know all potential nested issues and I will try 
> > to solve it if possible. But the problem is that I am not clear about 
> > those issues that you guys mentioned. Is there any thread talk about 
> > them?
> I think I was thinking along the lines of what I wrote in this thread:
>
> Msg-ID <52E28EFB.3020008@xxxxxxxxxxxxx>
>
> It seems there the minimum thing for a "1.0" release is that an L1 
> admin must not be able to do anything to affect an L0; and thinks at 
> the moment likely to do so are enabling PoD (and probably also paging) 
> for L2 guests.  It's OK if enabling PoD crashes the *L1* hypervisor 
> (because that's under the L1 admin's control); but it must not be 
> allowed to crash / DoS the L0 hypervisor.
BTW, I take it that you're only supporting 64-bit hypervisors at the 
moment?  A few weeks ago I tried Win7's "XP Compatibility Mode" with a 
32-bit guest and it just gave me weird errors when trying to start an L2 
guest.  64-bit worked just fine, however.
I don't think 32-bit L1's are particularly important, but it's 
officially not supported, that should probably be documented on the wiki 
page.
 -George

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