linux-kernel - [PATCH V12 13/14] RISC-V: paravirt: pvqspinlock: Add kconfig entry

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

Message-Id: <20231225125847.2778638-14-guoren@kernel.org>
Date: Mon, 25 Dec 2023 07:58:46 -0500
From: guoren@...nel.org
To: paul.walmsley@...ive.com,
	palmer@...belt.com,
	guoren@...nel.org,
	panqinglin2020@...as.ac.cn,
	bjorn@...osinc.com,
	conor.dooley@...rochip.com,
	leobras@...hat.com,
	peterz@...radead.org,
	anup@...infault.org,
	keescook@...omium.org,
	wuwei2016@...as.ac.cn,
	xiaoguang.xing@...hgo.com,
	chao.wei@...hgo.com,
	unicorn_wang@...look.com,
	uwu@...nowy.me,
	jszhang@...nel.org,
	wefu@...hat.com,
	atishp@...shpatra.org
Cc: linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	Guo Ren <guoren@...ux.alibaba.com>
Subject: [PATCH V12 13/14] RISC-V: paravirt: pvqspinlock: Add kconfig entry

From: Guo Ren <guoren@...ux.alibaba.com>

Add kconfig entry for paravirt_spinlock, an unfair qspinlock
virtualization-friendly backend, by halting the virtual CPU rather
than spinning.

Reviewed-by: Leonardo Bras <leobras@...hat.com>
Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
Signed-off-by: Guo Ren <guoren@...nel.org>
---
 arch/riscv/Kconfig         | 12 ++++++++++++
 arch/riscv/kernel/Makefile |  1 +
 2 files changed, 13 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index b7673c5c0997..7df3d50733c6 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -780,6 +780,18 @@ config RANDOMIZE_BASE
 
           If unsure, say N.
 
+config PARAVIRT_SPINLOCKS
+	bool "Paravirtualization layer for spinlocks"
+	depends on QUEUED_SPINLOCKS
+	default y
+	help
+	  Paravirtualized spinlocks allow a unfair qspinlock to replace the
+	  test-set kvm-guest virt spinlock implementation with something
+	  virtualization-friendly, for example, halt the virtual CPU rather
+	  than spinning.
+
+	  If you are unsure how to answer this question, answer Y.
+
 endmenu # "Kernel features"
 
 menu "Boot options"
diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile
index fee22a3d1b53..2e0754e422cf 100644
--- a/arch/riscv/kernel/Makefile
+++ b/arch/riscv/kernel/Makefile
@@ -102,3 +102,4 @@ obj-$(CONFIG_COMPAT)		+= compat_vdso/
 
 obj-$(CONFIG_64BIT)		+= pi/
 obj-$(CONFIG_ACPI)		+= acpi.o
+obj-$(CONFIG_PARAVIRT_SPINLOCKS) += qspinlock_paravirt.o
-- 
2.40.1