Re: [PATCH v3 9/9] KVM: riscv: selftests: Add sstc timer test

[Andrew Jones]

On Thu, Sep 14, 2023 at 10:52:15AM +0100, Conor Dooley wrote:
> On Thu, Sep 14, 2023 at 11:36:01AM +0200, Andrew Jones wrote:
> > > +static inline void cpu_relax(void)
> > > +{
> > > +#ifdef __riscv_zihintpause
> > > +	asm volatile("pause" ::: "memory");
> > > +#else
> > > +	/* Encoding of the pause instruction */
> > > +	asm volatile(".4byte 0x100000F" ::: "memory");
> > > +#endif
> > > +}
> > 
> > cpu_relax() should go to include/riscv/processor.h
> 
> Can the one from asm/vdso/processor.h be reused, or are there special
> considerations preventing that?

We'd need to copy it into tools/arch/riscv/include/asm, but it could be
done. Hmm, now that I look at it, I see we're missing the barrier() call
in this kvm selftests version.

Thanks,
drew