On 19.06.2020 14:10, Michał Leszczyński wrote: > ----- 19 cze 2020 o 13:58, Andrew Cooper [email protected] napisał(a): > >> We do not expose the feature to guests, so should disallow access to the >> respective MSRs. >> >> Signed-off-by: Andrew Cooper <[email protected]> >> --- >> CC: Jan Beulich <[email protected]> >> CC: Wei Liu <[email protected]> >> CC: Roger Pau Monné <[email protected]> >> CC: Paul Durrant <[email protected]> >> CC: Michał Leszczyński <[email protected]> >> >> 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
