On Tue, 19 May 2026 13:38:57 +0100,
Marc Zyngier <[email protected]> wrote:
>
> As I said before, I'd be OK with something that would restore IIDR to
> REV1. But not something that actively breaks the GIC emulation by
> reintroducing a bug. That's, by construction, dead code that will only
> bitrot, because there is no SW that can make use of this nonsense.
I will also add that if we make it a policy to preserve buggy
behaviours that the guest cannot be relying on, then I question
whether we should be fixing anything at all.
For example, 6.19 fixed a totally buggy behaviour where a guest
couldn't not have more than (on most HW) 4 interrupts in flight at any
given time. This was obviously totally bogus, and this was fixed
unconditionally, as legitimate guests could experience gold-platted
lock-ups.
Should we revert to the previous behaviour? In the affirmative, I will
simply stop fixing things, and someone else can have fun retrofitting
buggy crap.
M.
--
Without deviation from the norm, progress is not possible.
