RE: [Xen-devel] x86-64 Xen development

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> Sounds awesome! I'll be looking into supporting 32-bit apps. I am also
> getting the current tool ready for x86-64 to be able to lauch 64-bit
> domains.

Great. 
 
> Supporting 32-bit apps (as well as 32bit domains) are going to require
> an ioctl conversion layer as some syscall conversion stuff. Not 100%
> sure yet on how things are going to be just yet. I'll figure something
> out and get back to the list.

Supporting 32bit domains on 64 bit Xen is going to be ugly (requiring
shadow page tables), so I wouldn't count it as a priority. 32 bit user
space is certainly very important.

Ian

> 
> On Thu, 2005-03-03 at 09:03 -0800, Nakajima, Jun wrote:
> > Ian Pratt wrote:
> > >>  What is Intel's status on x86-64 work for Xen? Do require any
> > >> assistance on any remaining work to get Xen x86-64 
> enabled? We want
> > >> to have more public discussion on x86-64 Xen development.
> > > 
> > > Jun,
> > > 
> > > Please can you post the x86_64 dom0 domain builder so 
> that Jerone can
> > > get to work on the user space builder.
> > > 
> > > Are there any fixes we need to do to x86_64 xen? Have you 
> an ETA on
> > > the dom0 checkin?
> > 
> > Ian,
> > 
> > I'm shooting the next week, in a week or so. We've been 
> making steady
> > progress despite _numerous_ minor issus/problems. Jerone, 
> it would be
> > helpful if you take a look at 32-bit apps support (i.e. what does it
> > take for us to support those in xenolinux64) because we are not
> > proactively looking at the area at this point.
> > 
> > There are a couple of minor fixes required in the hypervisor. For
> > example, check_descriptor() in arch/x86/x86-64/mm.c needs 
> to shift bits
> > when comparing the value.  
> > /* The guest can only safely be executed in ring 3. */
> >     if ( ((b & _SEGMENT_DPL) >> 13) !=  3) {
> >                 goto bad;
> >     }
> > I'll send patches this week.
> > 
> > Jun
> > 
> > 
> -- 
> Jerone Young
> Open Virtualization
> IBM Linux Technology Center
> jyoung5@xxxxxxxxxx
> 512-838-1157 (T/L: 678-1157)
> 
> 


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