On Tue, 3 Dec 2024 at 10:19, Daniel P. Berrangé <berra...@redhat.com> wrote: > Separatley this from patch, we should also consider whether > it is time to do the same for aarch64/arm7. > > If I look at this page: > > https://gpages.juszkiewicz.com.pl/arm-socs-table/arm-socs.html > > and sort by 'announced' to see msot recent CPUs first, then > almost all of them have "NO" in the "aarch32 support" column. > > IOW, on modern aarch64 CPUs, qemu-arm is the only viable way > to run 32-bit usermode binaries AFAICT, and suggests we ought > to be creating a binfmt rule for that on aarch64 hosts.
What happens if you have a host CPU that *does* support 32-bit natively and you also register the binfmt rule? Does the host kernel prefer to execute natively or does it invoke QEMU? I don't think we want to roll out something that silently downgrades native execution to emulation... thanks -- PMM
