[Xen-devel] [RESEND][PATCH 5/5]MTRR/PAT virtualization

["Su, Disheng" <disheng.su@xxxxxxxxx>]

When guest changes MTRR/PAT, must flush cache and destroy shadow page
table in xen. This can be done in do_msr_write when guest changes
MTRR/PAT related MSRs. But there is a window that MTRR/PAT is different
between VCPUs when changing MTRR/PAT, it may bring some troubles or
incorrect. So we try another way to do it: 
        The guest will enter no-fill cache mode(set CR0:CD/NW) befor
changing MTRR/PAT, then update MTRR/PAT and exit no-fill mode. We
intercept the changing of cache mode. If one of vcpu is in no-fill mode
or MTRR/PAT is different between vcpus, set shadow pte as UC. When all
the vcpus exit from no-fill mode, and MTRR/PAT is the same between
vcpus, set shadow pte as usual.

Best Regards,
Disheng, Su

Attachment: mtrr_05_no_fill_mode.patch
Description: mtrr_05_no_fill_mode.patch

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