Re: [Xen-devel] Re: [Patch 1/3]RAS(Part II)--Intel MCA enalbing in XEN

[Christoph Egger <Christoph.Egger@xxxxxxx>]

On Friday 20 March 2009 10:23:58 Jiang, Yunhong wrote:
> xen-devel-bounces@xxxxxxxxxxxxxxxxxxx <> wrote:
> > Seconded.
> >
> > With Wei Huangs 1GB patch support, one question comes to my mind
> > regarding the page offline support / recovery action:
> >
> > How does the interface deal with different page sizes ?
> > IMO we should only offline the smallest possible unit of the
> > page in error,
> > which is 4KB. So larger pages (2MB, 1GB) must be splitted in that case.
> >
> > Christoph
>
> Christoph, I think this is two story. How to offline a page is a specific
> recover action method, instead of the MCA itself. Or I missed anything?

You're right here.

> For guest owned page offline caused by #MC, Xen can't do anything but mark
> it (the page frame, 4k) pending, so that when it is freed, it will not be
> accessed anymore.

Once Xen supports page-relocation, it can re-map the guest page in error
with a new one on the fly. For HVM guests w/o PV drivers, this should work.
Need some thinking how that should work for PV guests and HVM guests with
PV drivers.

> It will depends on the real recover action to make sure 
> it will not be accessed by guest anymore. For example, inject a vMC to
> guest, so that guest can do offline itself, or kill the domain directly in
> some situation.
>
> Or do I missed anything?
>
> Thanks
> Yunhong Jiang
>
> > On Friday 20 March 2009 09:51:24 Keir Fraser wrote:
> >> These changes need an ack from Sun.
> >>
> >>  -- Keir
> >>
> >> On 20/03/2009 05:03, "Ke, Liping" <liping.ke@xxxxxxxxx> wrote:
> >>> Hi, Keir
> >>>
> >>> This patch is the basic MCA enabling support for Intel.
> >>>
> >>> For implementation details, please refer to the discussion thread:
> >
> > http://lists.xensource.com/archives/html/xen-devel/2009-02/msg0
> > 0509.html
> >
> >>> Thanks& Regards,
> >>> Criping
> >
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-- 
---to satisfy European Law for business letters:
Advanced Micro Devices GmbH
Karl-Hammerschmidt-Str. 34, 85609 Dornach b. Muenchen
Geschaeftsfuehrer: Jochen Polster, Thomas M. McCoy, Giuliano Meroni
Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen
Registergericht Muenchen, HRB Nr. 43632


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