On Mon, Dec 15, 2014 at 04:43:59PM +0000, Varun Sethi wrote: > > Sure we can support 48-bit VAs with 64k pages. Why do you think we can't? > > > > [varun] My concern was with respect to the bits per level, which is > > uneven for the 64 K page sizes. Just wondering how would things work > > with 64K pages when we do a 3 level page lookup. > > Well, it's uneven (9) for the 4k case too. Do you actually see an issue here? > > 48-bit VA with 64k pages gives us: > > va_bits = (48 - 16) = 32 > bits_per_level = (16 - 3) = 13 > levels = ceil(32/13) = 3 > > so the starting level is 1, which resolves 32-(13*2) = 6 bits. > > Does that make sense? > > [[varun]]Yes, but what I meant was, is that in case of 4K pages you have 9 > bits per level, but for 64K pages you have 6 bits for the first level and > 13 each for second and third. So, bits per level would not work in case of > 64 K pages?
The current code takes this into account. Will _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
