On 1/29/25 04:47, Paolo Bonzini wrote:
The difference with TCG of course is that TCG is in active development, and therefore its
32-bit host support is not surviving passively in the same way that a random device is.
Still, I think we can identify at least three different parts that should be treated
differently: 64-on-32, 32-on-32 system-mode emulation and 32-on-32 user-mode emulation.
Why the user/system split for 32-on-32?
We could and should remove 64-on-32, maybe even without a deprecation period, but the rest
I'm not so sure. I don't know enough to understand their maintenance cost (other than the
mere existence of the 32-bit TCG backends), but it's certainly not comparable to 64-on-32.
Ok, lemme see how easy it is to prohibit configuring 64-on-32.
But I also think we should still deprecate 32-bit hosts, sooner rather than later. Even
if we have no immediate plans to remove them. I think we want interested parties to speak
up. At some point this decade I want to be able to say: we've given you fair warning and
time is up.
r~
