linux-kernel - [PATCH v4 0/3] riscv: Per-thread envcfg CSR support

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Message-ID: <20240814081126.956287-1-samuel.holland@sifive.com>
Date: Wed, 14 Aug 2024 01:10:53 -0700
From: Samuel Holland <samuel.holland@...ive.com>
To: linux-riscv@...ts.infradead.org,
	Palmer Dabbelt <palmer@...belt.com>
Cc: Andrew Jones <ajones@...tanamicro.com>,
	Conor Dooley <conor@...nel.org>,
	linux-kernel@...r.kernel.org,
	Deepak Gupta <debug@...osinc.com>,
	Samuel Holland <samuel.holland@...ive.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Andy Chiu <andy.chiu@...ive.com>,
	Charlie Jenkins <charlie@...osinc.com>,
	Clément Léger <cleger@...osinc.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Evan Green <evan@...osinc.com>,
	Greentime Hu <greentime.hu@...ive.com>,
	Guo Ren <guoren@...nel.org>,
	Leonardo Bras <leobras@...hat.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Sunil V L <sunilvl@...tanamicro.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Xiao Wang <xiao.w.wang@...el.com>,
	Zhao Ke <ke.zhao@...ngroup.cn>
Subject: [PATCH v4 0/3] riscv: Per-thread envcfg CSR support

This series (or equivalent) is a prerequisite for both user-mode pointer
masking and CFI support, as both of those are per-thread features and
are controlled by fields in the envcfg CSR. These patches are based on
v1 of the pointer masking series[1], with significant input from both
Deepak and Andrew.

[1]: https://lore.kernel.org/linux-riscv/20240319215915.832127-6-samuel.holland@sifive.com/

Changes in v4:
 - Rebase on riscv/for-next (v6.11-rc)
 - Add Conor's Reviewed-by tags from v2 (missed in v3)

Changes in v3:
 - Rebase on riscv/for-next
 - Drop use of __initdata due to conflicts with cpufeature.c refactoring

Changes in v2:
 - Rebase on riscv/for-next

Samuel Holland (3):
  riscv: Enable cbo.zero only when all harts support Zicboz
  riscv: Add support for per-thread envcfg CSR values
  riscv: Call riscv_user_isa_enable() only on the boot hart

 arch/riscv/include/asm/cpufeature.h |  2 +-
 arch/riscv/include/asm/processor.h  |  1 +
 arch/riscv/include/asm/switch_to.h  |  8 ++++++++
 arch/riscv/kernel/cpufeature.c      | 11 ++++++++---
 arch/riscv/kernel/smpboot.c         |  2 --
 arch/riscv/kernel/suspend.c         |  4 ++--
 6 files changed, 20 insertions(+), 8 deletions(-)

-- 
2.45.1