>>> On 26.06.15 at 10:10, <andrew.coop...@citrix.com> wrote: > On 26/06/2015 07:22, Jan Beulich wrote: >>>>> On 25.06.15 at 18:22, <andrew.coop...@citrix.com> wrote: >>> After recent consideration, I am still not sure if we want to support >>> SMAP in 32bit PV guests or not. The trapping of stac/clac would be a >>> high overhead, although the guest could modify EFLAGS.AC itself using popf. >> If it technically works (which it looks like it does) I see no reason >> leaving the decision to guests. > > True. For now, I will leave SMAP/SMEP unexposed and leave the CPUID > side of things to my levelling work.
In which case there's no point assuming an "aware" guest - with the CPUID flag unexposed, writes to CR4.SMAP are simply invalid. Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
