On 29 January 2018 at 14:51, Jeffrey Hugo <jhugo@xxxxxxxxxxxxxx> wrote: > On 1/25/2018 3:31 AM, Ard Biesheuvel wrote: > >> Note that capsule update has been omitted. This is a bit involved, and >> I'd rather get some feedback before burning too many cycles on that. All >> other services should be functional, with the caveat that EFI variable >> names are now limited to 1024 [wide] characters, and UEFI variables >> themselves to 64 KB. >> > > I'm curious, why these limitations? > Because mapping and unmapping things on the fly in the UEFI page tables is a bit complicated, although I need to do something of the kind for capsules anyway, so once I solve that, we can use the same approach for variables. > We don't have any concern about the name length limitation at this time, but > the variable size one is concerning. > > We have a feature which creates a variable greater than 64KB that we want to > utilize from Linux. The size limitation would seem to prevent that. > Well, the limit itself is rather arbitrary, and putting >64 KB into the fault tolerant, write ahead logging NOR flash seems mildly inappropriate to me. But you are right, the spec currently has no such limitations, so ideally, nor should the OS. -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
