On 28/12/17 19:25, Jacob Pan wrote: [...] >>> + * @size: 2^size of 4K pages, 0 for 4k, 9 for 2MB, >>> etc. >> >> Having only power of two invalidation seems too restrictive for a >> software interface. You might have the same problem as above, where >> the guest or userspace needs to send lots of invalidation requests, >> They could be multiplexed by passing an arbitrary range instead. How >> about making @size a __u64? >> > Sure if you have such need for non power of two. So it will be __u64 of > 4k pages?
4k granule would work for us right now, but other architectures may plan to support arbitrary sizes. The map/unmap API does support arbitrary sizes, so it might be better to have a byte granularity in @size. Thanks, Jean
