Re: [Xen-devel] [PATCH 0/3] x86/paravirt: Fix baremetal paravirt MSR ops

[Paolo Bonzini <pbonzini@xxxxxxxxxx>]

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.

Paolo

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