Messages in this thread | | | Date | Mon, 22 Aug 2022 04:17:01 -0700 | From | Christoph Hellwig <> | Subject | Re: [PATCH v2] swiotlb: avoid potential left shift overflow |
| |
On Sat, Aug 20, 2022 at 09:42:38AM +0800, Chao Gao wrote: > In an internal effort to measure the impact of swiotlb size to IO > performance of confidential VM (e.g., TDX VM), we simply added > SWIOTLB_ANY to the default io_tlb_mem to lift the restriction on swiotlb > size. Then we hit this issue and worked out this fix. I posted this > fix because I think the fix by itself is helpful because it removes the > implicit dependency of the left-shift in slot_addr() on swiotlb size and > then someone trying to lift the size limitation won't hit the same issue.
SWIOTLB_ANY is used for real, so I think this is a legitimate fix. I'll apply it.
| |