lkml.org 
[lkml]   [2009]   [Mar]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] xen: core dom0 support
Jeremy Fitzhardinge wrote:
>>
>> What do you define as "full PAT"? If what you mean is that Xen lays
>> claims to the PAT MSR and only allows a certain mapping that's hardly
>> a problem... other than that it's not an exhaustible resource so I
>> guess I really don't understand what you're trying to say here.
>
> It does not allow guests to set their own PAT MSRs. It can't easily be
> multiplexed either, as all CPUs must have the same settings for their
> PAT MSRs. I guess it could be handled by allowing domains to set their
> own virtual PAT MSRs, and then rewriting the ptes to convert from the
> guest PAT settings to Xen's, but I don't know if this is possible in
> general (and it poses some problems because the pte modifications would
> be guest-visible).
>

It would make a lot more sense to simply specify a particular set of
mappings. Since the only one anyone cares about that isn't in the
default set is WC anyway, it's easy to do.

-hpa

--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.



\
 
 \ /
  Last update: 2009-03-02 01:53    [W:0.189 / U:0.408 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site