>>> On 18.10.18 at 12:34, <andrew.coop...@citrix.com> wrote: > NX support in the host is required for the shadow pagetable code to handle > SMAP correctly for guests. > > Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com> > --- > CC: Jan Beulich <jbeul...@suse.com> > CC: Wei Liu <wei.l...@citrix.com> > CC: Roger Pau Monné <roger....@citrix.com> > CC: George Dunlap <george.dun...@eu.citrix.com> > CC: Tim Deegan <t...@xen.org> > > RFC because this is a little thorny. > > Strictly speaking, it is "Xen uses NX in HVM guest context" as the > prerequisite. We could in principle allow guests to use NX without using it > in Xen, but that sounds like unnecessary complication. Also, we have no > option to inhibit Xen from using NX if it finds it in hardware. > > This dependency also doesn't need to occur for HAP guests. > > In practice, all 64bit hardware (save the very first Intel 64bit CPUs) > supports NX, and expressing the interlock like this is far easier than trying > to account for it dynamically.
Fine with me nevertheless: Acked-by: Jan Beulich <jbeul...@suse.com> Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
