Re: [PATCH v13 05/21] KVM: pfncache: remove KVM_GUEST_USES_PFN usage

[Sean Christopherson]

On Thu, Feb 15, 2024, Paul Durrant wrote:
> From: Paul Durrant <pdurrant@xxxxxxxxxx>
> 
> As noted in [1] the KVM_GUEST_USES_PFN usage flag is never set by any
> callers of kvm_gpc_init(), which also makes the 'vcpu' argument redundant.

The changelog should explicitly call out that not only is KVM_GUEST_USES_PFN
unused, it's incomplete/broken (which is also partly why it's unused).  Without
that information, removing the support looks like a somewhat arbitrary decision,
versus a deliberate change to make it easier to support the gpc code.