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    SubjectRe: [PATCH] KVM: nVMX: Filter out all unsupported controls when eVMCS was activated
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    On 09/09/21 09:03, Vitaly Kuznetsov wrote:
    > Sean Christopherson <seanjc@google.com> writes:
    >
    >> On Tue, Sep 07, 2021, Vitaly Kuznetsov wrote:
    >>> Let's be bold this time and instead of playing whack-a-mole just filter out
    >>> all unsupported controls from VMX MSRs.
    >>
    >> Out of curiosity, why didn't we do this from the get-go?
    >
    > We actually did, the initial implementation (57b119da3594f) was
    > filtering out everything but then things changed in "only clear controls
    > which are known to cause issues" (31de3d2500e4). I forgot everything
    > already but was able to google this suggestion from Paolo:
    >
    > https://www.lkml.org/lkml/2020/1/22/1108

    The doubt was whether userspaces could be enabling eVMCS blindly, and
    thus would lose features for Linux guests.

    Paolo

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