From: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>
Signed-off-by: Guo Ren <guoren@xxxxxxxxxx>
---
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
