On 09/09/21 09:03, Vitaly Kuznetsov wrote:
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
The doubt was whether userspaces could be enabling eVMCS blindly, and
thus would lose features for Linux guests.
Paolo
