On Sep 22, 2016 02:56, "Jan Beulich" <jbeul...@suse.com> wrote: > > >>> On 21.09.16 at 17:30, <tamas.leng...@zentific.com> wrote: > > What I'm saying is that the guest OS should be in charge of managing > > its own TLB when VPID is in use. Whether it does flush the TLB or not > > is not of our concern. If it's a sane OS it will likely flush when it > > needs to, but we should not be jumping in and doing it as we do right > > now. We are actually breaking the architectural behavior by forcing a > > flush, MOV-TO-CR3 doesn't by itself flush the TLB on real hardware. > > I continue to not understand where you take this from. Writes to > CR3 have always been doing TLB flushes - full ones prior to the > introduction of global pages, and flushes of only non-global entries > nowadays. In fact prior to the introduction of INVLPG and CR4 > there was no other way to flush TLBs. >
Yes, I meant it doesn't completely flush the TLB as we do right now when invalidating the whole VPID. Tamas
_______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
