RISC-V: paravirt: pvqspinlock: Add nopvspin kernel parameter
Disables the qspinlock slow path using PV optimizations which allow the hypervisor to 'idle' the guest on lock contention. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@kernel.org>
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