From: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
To: Luis <luis.machado.foss@gmail.com>
Cc: 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>,
Catalin Marinas <catalin.marinas@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
David Spickett <david.spickett@arm.com>,
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 13:30:41 -0300 [thread overview]
Message-ID: <87ms4fmjpq.fsf@linaro.org> (raw)
In-Reply-To: <05dd180e-f12f-44ef-96e2-2a6013da14df@gmail.com> (Luis's message of "Fri, 21 Nov 2025 11:25:30 +0000")
Luis <luis.machado.foss@gmail.com> writes:
> [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.
I will work on it next week.
--
Thiago
prev parent reply other threads:[~2025-11-21 16:30 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
2025-11-21 16:30 ` Thiago Jung Bauermann [this message]
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