Re: [RFC PATCH 1/2] KVM: x86: Introduce KVM_{G, S}ET_ONE_REG uAPIs support

[Nikolas Wipper]

On Wed Sep 11, 2024 at 04:36 PM UTC+0200, Sean Christopherson wrote:
> On Wed, Sep 11, 2024, Nikolas Wipper wrote:
>> Having this API, and specifically having a definite kvm_one_reg structure
>> for x86 registers, would be interesting for register pinning/intercepts.
>> With one_reg for x86 the API could be platform agnostic and possible even
>> replace MSR filters for x86.
> 
> I don't follow.  MSR filters let userspace intercept accesses for a variety of
> reasons, these APIs simply provide a way to read/write a register value that is
> stored in KVM.  I don't see how this could replace MSR filters.

Nope, that would be an entirely different API, but if that uses one reg IDs it
could be unified to cover CRs and MSRs all in one.




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