Re: [PATCH v20 03/14] KVM: arm64: Manage GCS access and registers for guests

[Mark Brown]

On Mon, Sep 07, 2026 at 03:14:34PM +0100, Lorenzo Stoakes (ARM) wrote:
> On Fri, Sep 04, 2026 at 10:07:49PM +0100, Mark Brown wrote:
> > On Fri, Sep 04, 2026 at 09:54:51AM +0100, Lorenzo Stoakes (ARM) wrote:

> > I think the best thing overall would be to leave the runtime paths as
> > they are and refuse to run with an architecturally invalid setup, that
> > would avoid bloating the fast path.

> Ack, it'd be nice to not have to worry about that.

> Presumably we definitely want an oops on a GCS violation in general?

Yes, the guest is going to want GCS exceptions delivering if they've
enabled them and something triggers them.  It might also be relying on
the GCS for stack traces even if nothing triggers any GCS related fault.

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