Messages in this thread | | | Date | Thu, 17 Sep 2015 14:27:50 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 0/3] x86/paravirt: Fix baremetal paravirt MSR ops |
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On Thu, Sep 17, 2015 at 01:40:30PM +0200, Paolo Bonzini wrote: > > > On 17/09/2015 10:58, Peter Zijlstra wrote: > > But the far greater problem I have with the whole virt thing is that > > you cannot use rdmsr_safe() to probe if an MSR exists at all because, as > > you told me, these virt thingies return 0 for all 'unknown' MSRs instead > > of faulting. > > At least for KVM, that behavior is opt-in (the ignore_msrs parameter) > and no distro that I know enables it by default.
Ah, that would be good news. Andy earlier argued I could not rely on rdmsr_safe() faulting on unknown MSRs. If practically we can there's some code I can simplify :-)
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