[Xen-devel] Re: One potential issue of shadow fault emulation

[Tim Deegan <Tim.Deegan@xxxxxxxxxx>]

At 00:05 +0800 on 22 Dec (1198281908), Jiang, Yunhong wrote:
> >> So how should we cope with such situation? Stop emulation or,
> continue
> >> emulate , but access the virtual APIC page? Or any better idea?
> > 
> > We should stop emulation.  Probably nobody writes the TPR between the
> two
> > halves of a PTE write. :) 
> 
> This did happen :)

OK.  I've learned something new today. :)

I think it's cleanest to just fail the emulation if we find we're
writing to the vlapic, rather than adding special-case code to detect
and handle TPR writes within the page.  Unless this is a particularly
common path and would have a measurable performance impact for the extra
VMEXIT.

Cheers,

Tim.

-- 
Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Principal Software Engineer, Citrix Systems.
[Company #5334508: XenSource UK Ltd, reg'd c/o EC2Y 5EB, UK.]

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