2025-05-23T11:02:11-07:00, Atish Patra <atish.pa...@linux.dev>: > On 5/23/25 9:27 AM, Radim KrÄmáŠwrote: >> 2025-05-23T17:29:49+02:00, Clément Léger <cle...@rivosinc.com>: >>> Is this something blocking though ? We'd like to merge FWFT once SBI 3.0 >>> is ratified so that would be nice not delaying it too much. I'll take a >>> look at it to see if it isn't too long to implement. >> >> Not blocking, but I would at least default FWFT to disabled, because >> current userspace cannot handle [14/14]. (Well... save/restore was >> probably broken even before, but let's try to not make it worse. :]) >> > > User space can not enable or disable misaligned access delegation as > there is no interface for now rightly pointed by you.
I mean setting default_disabled=true and just disabling FWFT for the guest unless userspace explicitly enables the incomplete extension. We would blame the user for wanting mutually exclusive features. > I guess supporting > that would be quicker than fixing the broader guest save/restore > anyways. Isn't it ? Yes. The save/restore for FWFT is simple (if we disregard the discussions), but definitely more than a single line.
