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

guoren
2023-08-02T16:52:07Z

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 --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"