>>> On 13.12.16 at 04:57, <liang.z...@intel.com> wrote: > 1. Should we enable 5 level paging for PV guest ? (You are discussing)
Personally I think we should, but as you say - we haven't settled on this yet. > 2. Should we make the 5 level paging and 4 level paging supported with one > binary? May I suggest to make this dependent on (possibly among other aspects) how much of an impact the switch from using constants to using variables has on the various code paths, namely hot ones? Quite possibly the most flexible approach would be a Kconfig choice between 3 build flavors (static 4 levels, static 5 levels, runtime determined), which I would hope to not end up in too ugly overall source code. > 3. When should the 5 level EPT be enabled? I think the suggestion to avoid 5 levels when not needed for a guest is quite reasonable. In fact, if hardware allows it, using just 3 levels for not too big guests could be an option, too. > 4. Should we extend shadow page to support 5 level paging guest? That to a large part depends on what we settle on for 1). Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
