From: Guo Ren <[email protected]> Add kconfig entry for paravirt_spinlock, an unfair qspinlock virtualization-friendly backend, by halting the virtual CPU rather than spinning.
Reviewed-by: Leonardo Bras <[email protected]> Signed-off-by: Guo Ren <[email protected]> Signed-off-by: Guo Ren <[email protected]> --- 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
