Re: [PATCH v14 3/5] KVM: arm64: Manage GCS access and registers for guests

On Sat, Oct 05, 2024 at 03:02:09PM +0100, Marc Zyngier wrote:

Mark Brown broonie@kernel.org wrote:

...

Ah, I see. I'd been under the impression that the generic machinery was supposed to handle this already using the descriptions in emulate-nested.c and we only needed handlers for more specific actions.

From that very file:

/*

• Map encoding to trap bits for exception reported with EC=0x18.

[...] */

Everything else needs special handling.

I see. I had noticed that comment on that table but I didn't register that the comment wound up applying to the whole file rather than being about a specific part of the handling. I'm a bit confused about how things like the SVE traps I mentioned work here...