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Wed, 17 Sep 2025 23:36:07 -0700 (PDT) Date: Thu, 18 Sep 2025 08:35:40 +0200 Mime-Version: 1.0 X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 X-Developer-Signature: v=1; a=openpgp-sha256; l=1640; i=ardb@kernel.org; h=from:subject; bh=rNO7lD/OuznN/elc7/2TihvZkB/fdGPOYNhJzbseLp0=; b=owGbwMvMwCVmkMcZplerG8N4Wi2JIeP0CpsE7vV2ez+u1zTqWvlm66PI7v2vzq858OP34VDlH RdSd7CEdJSyMIhxMciKKbIIzP77bufpiVK1zrNkYeawMoEMYeDiFICJXNZgZJi8acHsj1ffLuVk fL/bXFd9jZnTm39O0idV/Nf9jMhU6bJm+Ge14c5izX+7hNeL3t5mGNO5U2iZoqlY/rFJqrp8UkJ t+dwA X-Mailer: git-send-email 2.51.0.384.g4c02a37b29-goog Message-ID: <20250918063539.2640512-7-ardb+git@google.com> Subject: [PATCH 0/5] arm64: Move kernel mode FPSIMD buffer to the stack From: Ard Biesheuvel To: linux-arm-kernel@lists.infradead.org Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, herbert@gondor.apana.org.au, ebiggers@kernel.org, Ard Biesheuvel , Marc Zyngier , Will Deacon , Mark Rutland , Kees Cook , Catalin Marinas , Mark Brown Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250917_233610_365329_716BF693 X-CRM114-Status: GOOD ( 11.65 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Ard Biesheuvel Move the buffer for preserving/restoring the kernel mode FPSIMD state on a context switch out of struct thread_struct, and onto the stack, so that the memory cost is not imposed needlessly on all tasks in the system. Patches #1 - #3 contains some prepwork so that patch #4 can tighten the rules around permitted usage patterns of kernel_neon_begin() and kernel_neon_end(). This permits #5 to provide a stack buffer to kernel_neon_begin() transparently, in a manner that ensures that it will remain available until after the associated call to kernel_neon_end() returns. Cc: Marc Zyngier Cc: Will Deacon Cc: Mark Rutland Cc: Kees Cook Cc: Catalin Marinas Cc: Mark Brown Ard Biesheuvel (5): crypto/arm64: aes-ce-ccm - Avoid pointless yield of the NEON unit crypto/arm64: sm4-ce-ccm - Avoid pointless yield of the NEON unit crypto/arm64: sm4-ce-gcm - Avoid pointless yield of the NEON unit arm64/fpsimd: Require kernel NEON begin/end calls from the same scope arm64/fpsimd: Allocate kernel mode FP/SIMD buffers on the stack arch/arm64/crypto/aes-ce-ccm-glue.c | 5 +-- arch/arm64/crypto/sm4-ce-ccm-glue.c | 10 ++---- arch/arm64/crypto/sm4-ce-gcm-glue.c | 10 ++---- arch/arm64/include/asm/neon.h | 7 ++-- arch/arm64/include/asm/processor.h | 2 +- arch/arm64/kernel/fpsimd.c | 34 +++++++++++++------- 6 files changed, 34 insertions(+), 34 deletions(-) base-commit: f83ec76bf285bea5727f478a68b894f5543ca76e -- 2.51.0.384.g4c02a37b29-goog