[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] mapping of memory below 16Mb
On 24/1/08 15:15, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote: > One point I got a little surprised about while doing the 1Gb page support: > The 1:1 mapping of the low 16 Mb (and most significantly the first Mb) > created at boot time is being retained permanently. Shouldn't Xen be > following the E820 map also for this memory range (by either not > mapping non-RAM at all or at best mapping them UC/WP)? Below 1MB is a special case, and 1MB-16MB we're dodging BIOS tables, not actual hardware. At least this is the case for all system I know about. If there are exceptions which we care about, then we can try harder. Otherwise that code is quite complicated enough as it is. > The WP attribute raises another question: Are there any plans to make > Xen use PAT rather than (relying on) MTRRs? Linux folks seem to be > finally getting closer to this, too, so even virtual PAT support may be > needed in not too distant future... We already support PAT for both PV guests and HVM guests. -- Keir > Jan > > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxx > http://lists.xensource.com/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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