diff mbox series

[V10,16/19] RISC-V: paravirt: pvqspinlock: Add kconfig entry

Message ID 20230802164701.192791-17-guoren@kernel.org (mailing list archive)
State Handled Elsewhere
Headers show
Series riscv: Add Native/Paravirt/CNA qspinlock support | expand

Checks

Context Check Description
conchuod/tree_selection fail Failed to apply to next/pending-fixes, riscv/for-next or riscv/master

Commit Message

Guo Ren Aug. 2, 2023, 4:46 p.m. UTC 
From: Guo Ren <guoren@linux.alibaba.com>

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

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
---
 arch/riscv/Kconfig | 12 ++++++++++++
 1 file changed, 12 insertions(+)
diff mbox series

Patch

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 42ae45c42b4d..13f345b54581 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -770,6 +770,7 @@  config RELOCATABLE
 config PARAVIRT
 	bool "Enable paravirtualization code"
 	depends on RISCV_SBI
+	select PARAVIRT_SPINLOCKS
 	default y
 	help
 	  This changes the kernel so it can modify itself when it is run
@@ -788,6 +789,17 @@  config PARAVIRT_TIME_ACCOUNTING
 
 	  If in doubt, say N here.
 
+config PARAVIRT_SPINLOCKS
+	bool "Paravirtualization layer for spinlocks"
+	depends on PARAVIRT && SMP
+	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"