>>> On 26.11.18 at 18:30, <paul.durr...@citrix.com> wrote: > The page merging logic makes use of bits 1-8 and bit 63 of a PTE, which used > to be specified as ignored. However, bits 5 and 6 are now specified as > 'accessed' and 'dirty' bits and their use only remains safe as long as > the DTE 'Host Access Dirty' bits remain clear. The code is also of dubious > benefit and was the subject XSA-275. > > This patch removes the code, freeing up the remaining PTE 'ignored' bits > for other potential use and shortening the source by 170 lines.
No word at all about the performance implications? Do you have any plans to re-introduce properly working page recombining code? I realize VT-d doesn't have any either (the maintainers at some point in the distant past had promised to implement it, but I guess that's long been forgotten), but anyway... Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
