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Fri, 21 Nov 2025 03:25:31 -0800 (PST) Message-ID: <05dd180e-f12f-44ef-96e2-2a6013da14df@gmail.com> Date: Fri, 21 Nov 2025 11:25:30 +0000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 0/3] arm64/sme: Support disabling streaming mode via ptrace on SME only systems Content-Language: en-US To: Catalin Marinas , Will Deacon , Shuah Khan , Jonathan Corbet , Oleg Nesterov , Mark Brown Cc: Catalin Marinas , Mark Rutland , David Spickett , Thiago Jung Bauermann , linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org References: <20251015-arm64-sme-ptrace-sme-only-v2-0-33c7b2f27cbf@kernel.org> <176341325906.789443.15370787298292895484.b4-ty@arm.com> From: Luis In-Reply-To: <176341325906.789443.15370787298292895484.b4-ty@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit [off-list, as I'm having bouncing issues] Hi, On 17/11/2025 21:00, Catalin Marinas wrote: > From: Catalin Marinas > > 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.