Removing silly virtio-dev@ list because it's bouncing mail... On 12/07/2016 08:21 AM, David Hildenbrand wrote: >> Li's current patches do that. Well, maybe not pfn/length, but they do >> take a pfn and page-order, which fits perfectly with the kernel's >> concept of high-order pages. > > So we can send length in powers of two. Still, I don't see any benefit > over a simple pfn/len schema. But I'll have a more detailed look at the > implementation first, maybe that will enlighten me :)
It is more space-efficient. We're fitting the order into 6 bits, which would allows the full 2^64 address space to be represented in one entry, and leaves room for the bitmap size to be encoded as well, if we decide we need a bitmap in the future. If that was purely a length, we'd be limited to 64*4k pages per entry, which isn't even a full large page. _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
