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

[guoren at kernel.org]

From: Guo Ren <guoren at 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 at linux.alibaba.com>
Signed-off-by: Guo Ren <guoren at 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"
-- 
2.36.1