Re: [Xen-devel] Possible shadow bug

[Tim Deegan <Tim.Deegan@xxxxxxxxxx>]

At 11:01 +0100 on 10 Jun (1307703699), Tim Deegan wrote:
> Actually, looking at the disassembly you posted, it looks more like it
> might be an emulator bug in Xen; if Xen finds itself emulating the IMUL
> instruction and either gets the logic wrong or does the memory access
> wrong, it could cause that failure.  And one reason that Xen emulates
> instructions is if the memory operand is on a pagetable that's shadowed
> (which might be a page that was recently a pagetable). 
> 
> ISTR that even though the RHEL xen reports a 3.0.x version it has quite
> a lot of backports in it.  Does it have this patch?
> http://hg.uk.xensource.com/xen-3.1-testing.hg/rev/e8fca4c42d05

Oops, that URL doesn't work; I meant this:
http://xenbits.xen.org/xen-3.1-testing.hg/rev/e8fca4c42d05

Tim.

-- 
Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Principal Software Engineer, Xen Platform Team
Citrix Systems UK Ltd.  (Company #02937203, SL9 0BG)

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