Re: [PATCH v2 1/4] KVM: arm64: Don't WARN on an unsupported TLBI OS from vEL1

[Fuad Tabba]

Hi Oliver,

On Mon, 28 Sep 2026 18:05:09 +0100, Oliver Upton <oupton@xxxxxxxxxx> wrote:
[...]
> So the FGUs don't actually require any hardware support, they're just a
> representation of our UNDEF emulation that can be applied even on
> non-FGT. That's actually the way we had them wired before the whole
> config.c rewrite.
>
> Can you look into reinstating the FGUs?

Will do. The FGT entries never make it into the xarray without
ARM64_HAS_FGT, so the FGU check in triage_sysreg_trap() has nothing to
match on those CPUs. v3 drops that gate and leaves handle_tlbi_el1()
alone.

AFAICT that skip has been there since the FGT forwarding
infrastructure went in, before the FGUs existed, so I'll write it up
as making the FGUs work on non-FGT hosts.

Cheers,
/fuad