Messages in this thread | | | Subject | Re: [Xen-devel] MTRR on Xen - BIOS use and implications for Linux | From | David Vrabel <> | Date | Thu, 17 Mar 2016 11:13:03 +0000 |
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tl;dr?
Somewhere in here are some actual questions which I will attempt to answer. Please try and be more concise in future.
On 16/03/16 20:08, Luis R. Rodriguez wrote: > Toshi noted a while ago as well that if BIOS/firmware enables MTRR but > the kernel does not have it enabled one issue might have been any > MTRRs set up by the BIOS and ensuring the mapping is respected, in > particular UC settings, this concern is raised above. Another issue > though is that the kernel would be "unable to verify if a large page > mapping is aligned with MTRRs" [3]
This is not a relevant concern for Xen guests: PV guests do not support superpage mappings and HVM guests never see real MTRRs.
David
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