Re: [PATCH] KVM: nVMX: Filter out all unsupported controls when eVMCS was activated

[Vitaly Kuznetsov]

Sean Christopherson <seanjc@xxxxxxxxxx> 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

so finally we've settled on a shortened list. Now as new Windows version
is out, we have new problems to solve)

-- 
Vitaly