Messages in this thread | | | Date | Wed, 20 May 2009 15:49:17 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: [GIT PULL] xen /proc/mtrr implementation |
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Andi Kleen wrote: > There were drivers at some point that set WC MTRRs on their > transfer rings, not mmio. >
To avoid cache pollution effects?
> Maybe these all switched to PAT now, maybe not > > It's hard to say because it could be also done from user space. >
How does userspace do the virtual to physical mapping? If the driver can't also deal with the extra conversion from physical to machine under Xen, then it won't have much success either way.
J
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