----- 19 cze 2020 o 14:49, Jan Beulich jbeul...@suse.com napisał(a): > On 19.06.2020 14:10, Michał Leszczyński wrote: >> ----- 19 cze 2020 o 13:58, Andrew Cooper andrew.coop...@citrix.com >> napisał(a): >> >>> We do not expose the feature to guests, so should disallow access to the >>> respective MSRs. >>> >>> Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com> >>> --- >>> CC: Jan Beulich <jbeul...@suse.com> >>> CC: Wei Liu <w...@xen.org> >>> CC: Roger Pau Monné <roger....@citrix.com> >>> CC: Paul Durrant <p...@xen.org> >>> CC: Michał Leszczyński <michal.leszczyn...@cert.pl> >>> >>> Paul: For 4.14. This needs backporting to older trees as well. >>> >>> Michał: CC'ing, just to keep you in the loop. Xen has some dubious default >>> MSR semantics which we're still in the middle of untangling in a backwards >>> compatible way. Patches like this will eventually not be necessary, but >>> they >>> are for now. >> >> >> As for external IPT monitoring, it would be best if the VM would think >> that IPT is simply not supported at all by the underlying hypervisor. > > This is already the case, isn't it? Yet not reporting a feature may > not keep a guest from trying to access the respective MSRs. > > Jan
Okay, understood :) ml
