linux-kernel - [PATCH 0/3] RISC-V: Support querying vendor extensions

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230705-thead_vendor_extensions-v1-0-ad6915349c4d@rivosinc.com>
Date:   Wed, 05 Jul 2023 20:30:16 -0700
From:   Charlie Jenkins <charlie@...osinc.com>
To:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Jonathan Corbet <corbet@....net>, charlie@...osinc.com,
        evan@...osinc.com, heiko@...ech.de, linux-doc@...r.kernel.org
Subject: [PATCH 0/3] RISC-V: Support querying vendor extensions

Introduce extensible method of querying vendor extensions. Keys above
1UL<<63 passed into the riscv_hwprobe syscall are reserved for vendor
extensions. The appropriate vendor is resolved using the discovered
mvendorid. Vendor specific code is then entered which determines how to
respond to the input hwprobe key.

The T-Head 0.7.1 vector extension is used to complete this vendor
extension framework. If vector support is compiled in and the cpu is
T-Head c906, determined with (marchid == 0 && mimpid == 0), then the
value of the hwprobe pair is set to 1 (defined as
THEAD_ISA_EXT0_V0_7_1).

Signed-off-by: Charlie Jenkins <charlie@...osinc.com>
---
Charlie Jenkins (3):
      RISC-V: Framework for vendor extensions
      RISC-V: Add T-Head 0.7.1 vector extension to hwprobe
      RISC-V: Include documentation for hwprobe vendor extensions

 Documentation/riscv/hwprobe.rst                 | 17 +++++++
 arch/riscv/Kbuild                               |  1 +
 arch/riscv/Kconfig                              |  1 +
 arch/riscv/Kconfig.vendor                       | 14 ++++++
 arch/riscv/include/asm/extensions.h             | 16 +++++++
 arch/riscv/include/asm/hwprobe.h                |  1 +
 arch/riscv/kernel/sys_riscv.c                   | 60 +++++++++++++++++++++++--
 arch/riscv/vendor_extensions/Makefile           |  5 +++
 arch/riscv/vendor_extensions/thead/Makefile     |  8 ++++
 arch/riscv/vendor_extensions/thead/extensions.c | 24 ++++++++++
 10 files changed, 144 insertions(+), 3 deletions(-)
---
base-commit: 53cdf865f90ba922a854c65ed05b519f9d728424
change-id: 20230627-thead_vendor_extensions-0d320a311fcb
-- 
- Charlie