Re: [PATCH] KVM: x86: Deflect unknown MSR accesses to user space

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On 29.07.20 10:23, Vitaly Kuznetsov wrote:



Jim Mattson <jmattson@xxxxxxxxxx> writes:

On Tue, Jul 28, 2020 at 5:41 AM Alexander Graf <graf@xxxxxxxxxx> wrote:


...

While it does feel a bit overengineered, it would solve the problem that
we're turning in-KVM handled MSRs into an ABI.

It seems unlikely that userspace is going to know what to do with a
large number of MSRs. I suspect that a small enumerated list will
suffice.

The list can also be 'wildcarded', i.e.
{
  u32 index;
  u32 mask;
  ...
}

to make it really short.

I like the idea of wildcards, but I can't quite wrap my head around how we would implement ignore_msrs in user space with them?


Alex



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