Re: [PATCH 14/14] KVM: x86: Add helpers to prepare kvm_run for userspace MMIO exit

[Edgecombe, Rick P]

On Mon, 2026-03-02 at 18:24 -0800, Sean Christopherson wrote:
> Ooh, better idea.  Since TDX is the only direct user of
> __kvm_prepare_emulated_mmio_exit() and it only supports lenths of 1, 2, 4, and 8,
> kvm_prepare_emulated_mmio_exit() is the only path that actually needs to cap the
> length.  Then the inner helper can assert a valid length.  Doesn't change anything
> in practice, but I like the idea of making the caller be aware of the limitation
> (even if that caller is itself a helper).

Seems ok and an improvement over the patch. But looking at the other callers,
there is quite a bit of min(8u, len) logic spread around. Might be worth a wider
cleanup someday.