2025-05-23T11:02:11-07:00, Atish Patra atish.patra@linux.dev:
On 5/23/25 9:27 AM, Radim KrÄmáŠwrote:
2025-05-23T17:29:49+02:00, Clément Léger cleger@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 supportingthat 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.