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Re: [Xen-devel] [PATCH 4/4] Enable VirtualPC 2007 run on top of XEN: add_write_for_data_pages

At 18:06 +0800 on 01 Feb (1201889179), Su, Disheng wrote:
> Tim Deegan wrote:
> > Unfortunately, this isn't safe for SMP guests -- vcpu0's wp bit being
> > clear shouldn't let vcpu1 ignore the _PAGE_RW bits on shared mappings.
> Yes, this situation havn't be handled. Could you give me some
> suggestion?
> How about out-of-sync shadow for CR0.wp = 0?

Yes, out-of-sync shadows will indeed help here, and we hope to have some
out-of-sync patches in the next month or two.  One down-side is that OOS
tends to be an overall performance loss for multi-processor guests.



Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Principal Software Engineer, Citrix Systems (R&D) Ltd.
[Company #02300071, SL9 0DZ, UK.]

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