On Sun, Sep 10, 2023 at 04:29:08AM -0400, guoren@xxxxxxxxxx wrote: > 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. > > 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 4bcff2860f48..ec0da24ed6fb 100644 > --- a/arch/riscv/Kconfig > +++ b/arch/riscv/Kconfig > @@ -813,6 +813,18 @@ config RELOCATABLE > > 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 671ad85f28f2..114b29234c46 100644 > --- a/arch/riscv/kernel/Makefile > +++ b/arch/riscv/kernel/Makefile > @@ -103,3 +103,4 @@ obj-$(CONFIG_ARCH_RV64ILP32) += compat_signal.o > > obj-$(CONFIG_64BIT) += pi/ > obj-$(CONFIG_ACPI) += acpi.o > +obj-$(CONFIG_PARAVIRT_SPINLOCKS) += qspinlock_paravirt.o > -- > 2.36.1 > LGTM: Reviewed-by: Leonardo Bras <leobras@xxxxxxxxxx> Thanks! Leo
