* Sasha Levin <[email protected]> wrote:

> +++ b/tools/kvm/include/kvm/virtio.h
> @@ -36,6 +36,11 @@ static inline bool virt_queue__available(struct virt_queue 
> *vq)
>       return vq->vring.avail->idx !=  vq->last_avail_idx;
>  }
>  
> +static inline void *guest_pfn_to_host(struct kvm *kvm, u32 pfn)
> +{
> +     return guest_flat_to_host(kvm, (unsigned long)pfn << 12);
> +}

We should at minimum document that on 32-bit hosts this will clip things at 
4GB.

Documenting such things helps, in case someone ventures into fixing this 
limitation in the future.

Thanks,

        Ingo
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