From: Luis <luis.machado.foss@gmail.com>
To: Catalin Marinas <cmarinas@kernel.org>,
Will Deacon <will@kernel.org>, Shuah Khan <shuah@kernel.org>,
Jonathan Corbet <corbet@lwn.net>, Oleg Nesterov <oleg@redhat.com>,
Mark Brown <broonie@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
David Spickett <david.spickett@arm.com>,
Thiago Jung Bauermann <thiago.bauermann@linaro.org>,
linux-arm-kernel@lists.infradead.org,
linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-doc@vger.kernel.org
Subject: Re: [PATCH v2 0/3] arm64/sme: Support disabling streaming mode via ptrace on SME only systems
Date: Fri, 21 Nov 2025 11:25:30 +0000 [thread overview]
Message-ID: <05dd180e-f12f-44ef-96e2-2a6013da14df@gmail.com> (raw)
In-Reply-To: <176341325906.789443.15370787298292895484.b4-ty@arm.com>
[off-list, as I'm having bouncing issues]
Hi,
On 17/11/2025 21:00, Catalin Marinas wrote:
> From: Catalin Marinas <catalin.marinas@arm.com>
>
> 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.
next prev parent reply other threads:[~2025-11-21 11:25 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-15 17:56 [PATCH v2 0/3] arm64/sme: Support disabling streaming mode via ptrace on SME only systems Mark Brown
2025-10-15 17:56 ` [PATCH v2 1/3] " Mark Brown
2025-10-29 15:23 ` David Spickett
2025-10-15 17:56 ` [PATCH v2 2/3] kselftst/arm64: Test NT_ARM_SVE FPSIMD format writes on non-SVE systems Mark Brown
2025-10-15 17:56 ` [PATCH v2 3/3] kselftest/arm64: Cover disabling streaming mode without SVE in fp-ptrace Mark Brown
2025-11-17 21:00 ` [PATCH v2 0/3] arm64/sme: Support disabling streaming mode via ptrace on SME only systems Catalin Marinas
2025-11-21 11:25 ` Luis [this message]
2025-11-21 16:30 ` Thiago Jung Bauermann
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