>>> On 19.08.16 at 16:52, <konrad.w...@oracle.com> wrote: > On Thu, Aug 18, 2016 at 04:06:33AM -0600, Jan Beulich wrote: >> >>> On 17.08.16 at 22:32, <konrad.w...@oracle.com> wrote: >> > Looking at the kernel it assumes that WB is ok for 640KB->1MB. >> > The comment says: >> > " /* Low ISA region is always mapped WB in page table. No need to track >> > *" >> >> As per above it's not clear to me what this comment is backed by. > > I was hoping you would know :-) > > Ah, commit 2e5d9c857d4e6c9e7b7d8c8c86a68a7842d213d6 > Author: venkatesh.pallip...@intel.com <venkatesh.pallip...@intel.com> > Date: Tue Mar 18 17:00:14 2008 -0700 > > x86: PAT infrastructure patch > > Sets up pat_init() infrastructure. > > > which sets the MTRR for that region.
Hmm, that's the commit which introduced pat.c years ago. I can't see it writing an MTRRs though, nor can I see it backing the comment in adds in any way. I guess I'm confused... Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
