RISC-V: paravirt: pvqspinlock: KVM: Add paravirt qspinlock skeleton
Add the files functions needed to support the SBI PVLOCK (paravirt qspinlock kick_cpu) extension. This is a preparation for the next core implementation of kick_cpu. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@kernel.org>
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