From patchwork Mon Jan 22 16:28:03 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 764956 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D95681DA5E; Mon, 22 Jan 2024 16:28:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705940907; cv=none; b=mltr9vbbuXwX5H6OGGb8uqADLpmg/hb4Df43422iGhnFdI+/KtCAMn+sP3dRnm/xBY9pD8QCWd7ayxs2eUlsP5Qg0Mc6lBuI/k71m5vGSkmiD3Cs/DVuaHyIvhKxpPREgrbAxXBL6e0xePuXD7PJY5eJg0FRQwSqBW3GZWj08Hg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705940907; c=relaxed/simple; bh=yU1L94VKvych83kNlKcfNEAjXVSSH90zSUQFgVDmdBo=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=dkSweOtlhExjQfKOmM1TN4MvJsW8zgkcVOXPlFwgiL3g1BVKYh6EWzgenGx6BD3hBrHh0dPxMQRWJWOp/lt9QtMwCUnOrxZX0tLhlfFJXOQtCXBXgUgeHzZqlzdscXDWQZPotUdrBOt1jUq0efVhV1H6W6FUofwXRH7QNGrStOk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=C/Ui+xvu; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="C/Ui+xvu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 64EFBC433C7; Mon, 22 Jan 2024 16:28:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1705940906; bh=yU1L94VKvych83kNlKcfNEAjXVSSH90zSUQFgVDmdBo=; h=From:Subject:Date:To:Cc:From; b=C/Ui+xvuxwU9DDJVlibwNqE2F9gS4t08pysH74dCMMTpRPRc6wffzVL0FlqHtWJd1 zmJJq7xeXJuFLNElwGqEaTcMrzP2DmR0z1kPfSfswKjbPnrP7g7fMpKBaCRRrsse8V MHVOWTzJO4KacYMueEd5IkWzT/vkhc3JFTHVAugnv0pvu9cQk4qKaDZyx0as8Xk4Og ZCI7fS1W50RsRHtl/PpmwZHIKQeYf8gQROz5W9d3cN5FN1eBQDrbXUonI3G6NzG3Fm CnOGYQZRFUEM6C6ggQYK2z9iXnYvYP9e1fUTUQn9ulYU2r8miATiWUgGs/gEmAouTl crjVuqk7o2b8g== From: Mark Brown Subject: [PATCH v4 00/14] arm64: Support for 2023 DPISA extensions Date: Mon, 22 Jan 2024 16:28:03 +0000 Message-Id: <20240122-arm64-2023-dpisa-v4-0-776e094861df@kernel.org> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-B4-Tracking: v=1; b=H4sIAJSXrmUC/23N0QqCMBTG8VeJXbfYzo7b7Kr3iC6mmzoqlS2kE N+9KYGEXv4/OL8zkuiCd5GcDyMJbvDRd20KPB5I2Zi2dtTb1AQYCM6YoCY8JdI5qe19NBQqYSF TKFEhSWd9cJV/L+T1lrrx8dWFz/Jh4PP6w0BusYFTRjUqZm2u86KAy92F1j1OXajJrA2wCpzjj gBJQAUZ1zlW0uiNIFYBWLYjiCTYoixKq6UyqvoTpmn6AuWXLoM1AQAA To: Catalin Marinas , Will Deacon , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Jonathan Corbet , Shuah Khan Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Dave Martin , kvmarm@lists.linux.dev, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Mark Brown X-Mailer: b4 0.13-dev-5c066 X-Developer-Signature: v=1; a=openpgp-sha256; l=4620; i=broonie@kernel.org; h=from:subject:message-id; bh=yU1L94VKvych83kNlKcfNEAjXVSSH90zSUQFgVDmdBo=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBlrpebAKJwsvPF0u841eY8AfCNgFYHU3etbwbWemVX We8FYBiJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZa6XmwAKCRAk1otyXVSH0PKHB/ kBMuRfTZaXyGWBlnliKAkjtgawcERWxDvl3k6zKKAz8JHHz1VpJKOQbrIiqep/8J2eMIPQ3eh3R+Te HDiw+wS65cfEHEoPPVPIHS9jkGnvS7QCBWMgET3Ay0tsR/r3UZSgvi9luIkovDj9qLNufxD50d2Lso etyC6I9IGZGdhcWGsCIS5lEUKP3cmzOdXTxJLnkXNi4aFOQwj4Td2R79DTwZZBhLo3bJoAfVJvC19p l2xtt65uycxp2VqtDGf3FcWhhdaePKhZYi9KLpO8T7qjq3M30tV0LvPl8rNlMAyL8T70dbiAijbVsG FEisAtGEr5PuEVSUfrEGXBHpnA2/ui X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB This series enables support for the data processing extensions in the newly released 2023 architecture, this is mainly support for 8 bit floating point formats. Most of the extensions only introduce new instructions and therefore only require hwcaps but there is a new EL0 visible control register FPMR used to control the 8 bit floating point formats, we need to manage traps for this and context switch it. Due to uncertainty with the plan for parsing ID registers to identify which features to expose to the guest the KVM support is placed at the end of the series, it will need to be revised once that issue is resolved. The sharing of floating point save code between the host and guest kernels slightly complicates the introduction of KVM support, we first introduce host support with some placeholders for KVM then replace those with the actual KVM support. I've not added test coverage for ptrace, I've got a test program which exercises all the FP ptrace interfaces and their interactions together, my plan is to cover it there rather than add another tiny test program that duplicates the boilerplace for tracing a target and doesn't actually run the traced program. Signed-off-by: Mark Brown --- Changes in v4: - Rebase onto v6.8-rc1. - Move KVM support to the end of the series. - Link to v3: https://lore.kernel.org/r/20231205-arm64-2023-dpisa-v3-0-dbcbcd867a7f@kernel.org Changes in v3: - Rebase onto v6.7-rc3. - Hook up traps for FPMR in emulate-nested.c. - Link to v2: https://lore.kernel.org/r/20231114-arm64-2023-dpisa-v2-0-47251894f6a8@kernel.org Changes in v2: - Rebase onto v6.7-rc1. - Link to v1: https://lore.kernel.org/r/20231026-arm64-2023-dpisa-v1-0-8470dd989bb2@kernel.org --- Mark Brown (14): arm64/cpufeature: Hook new identification registers up to cpufeature arm64/fpsimd: Enable host kernel access to FPMR arm64/fpsimd: Support FEAT_FPMR arm64/signal: Add FPMR signal handling arm64/ptrace: Expose FPMR via ptrace arm64/hwcap: Define hwcaps for 2023 DPISA features kselftest/arm64: Handle FPMR context in generic signal frame parser kselftest/arm64: Add basic FPMR test kselftest/arm64: Add 2023 DPISA hwcap test coverage KVM: arm64: Share all userspace hardened thread data with the hypervisor KVM: arm64: Add newly allocated ID registers to register descriptions KVM: arm64: Support FEAT_FPMR for guests KVM: arm64: selftests: Document feature registers added in 2023 extensions KVM: arm64: selftests: Teach get-reg-list about FPMR Documentation/arch/arm64/elf_hwcaps.rst | 49 +++++ arch/arm64/include/asm/cpu.h | 3 + arch/arm64/include/asm/cpufeature.h | 5 + arch/arm64/include/asm/fpsimd.h | 2 + arch/arm64/include/asm/hwcap.h | 15 ++ arch/arm64/include/asm/kvm_arm.h | 4 +- arch/arm64/include/asm/kvm_host.h | 5 +- arch/arm64/include/asm/processor.h | 6 +- arch/arm64/include/uapi/asm/hwcap.h | 15 ++ arch/arm64/include/uapi/asm/sigcontext.h | 8 + arch/arm64/kernel/cpufeature.c | 72 +++++++ arch/arm64/kernel/cpuinfo.c | 18 ++ arch/arm64/kernel/fpsimd.c | 13 ++ arch/arm64/kernel/ptrace.c | 42 ++++ arch/arm64/kernel/signal.c | 59 ++++++ arch/arm64/kvm/emulate-nested.c | 8 + arch/arm64/kvm/fpsimd.c | 14 +- arch/arm64/kvm/hyp/include/hyp/switch.h | 9 +- arch/arm64/kvm/hyp/nvhe/hyp-main.c | 4 +- arch/arm64/kvm/sys_regs.c | 17 +- arch/arm64/tools/cpucaps | 1 + include/uapi/linux/elf.h | 1 + tools/testing/selftests/arm64/abi/hwcap.c | 217 +++++++++++++++++++++ tools/testing/selftests/arm64/signal/.gitignore | 1 + .../arm64/signal/testcases/fpmr_siginfo.c | 82 ++++++++ .../selftests/arm64/signal/testcases/testcases.c | 8 + .../selftests/arm64/signal/testcases/testcases.h | 1 + tools/testing/selftests/kvm/aarch64/get-reg-list.c | 11 +- 28 files changed, 670 insertions(+), 20 deletions(-) --- base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d change-id: 20231003-arm64-2023-dpisa-2f3d25746474 Best regards,