Re: [PATCH v2 0/3] arm64/sme: Support disabling streaming mode via ptrace on SME only systems

[Luis]

[off-list, as I'm having bouncing issues]

Hi,

On 17/11/2025 21:00, Catalin Marinas wrote:
> From: Catalin Marinas <catalin.marinas@xxxxxxx>
>
> On Wed, 15 Oct 2025 18:56:35 +0100, Mark Brown wrote:
> > Currently it is not possible to disable streaming mode via ptrace on SME
> > only systems, the interface for doing this is to write via NT_ARM_SVE but
> > such writes will be rejected on a system without SVE support. Enable this
> > functionality by allowing userspace to write SVE_PT_REGS_FPSIMD format data
> > via NT_ARM_SVE with the vector length set to 0 on SME only systems. Such
> > writes currently error since we require that a vector length is specified
> > which should minimise the risk that existing software is relying on current
> > behaviour.
> >
> > [...]
>
> I don't think we'll get gdb feedback soon. Thanks David for the LLDB
> ack.

Unfortunately this flew under the radar for me, and I haven´t been 
following these discussions closely.

Is there someone working to rectify/validate this in GDB from Arm's side?

I´d gladly review it and get it through into upstream gdb.