Re: [PATCH v3 07/11] kvm: arm64: Duplicate arm64_ssbd_callback_required for nVHE hyp

[David Brazdil]

> >  		u64 *ptr;
> >  
> > -		ptr = per_cpu_ptr(&arm64_ssbd_callback_required, cpu);
> > +		ptr = per_cpu_ptr_nvhe(arm64_ssbd_callback_required, cpu);
> >  		err = create_hyp_mappings(ptr, ptr + 1, PAGE_HYP);
> >  		if (err)
> >  			return err;
> > +
> > +		/* Copy value from kernel to hyp. */
> > +		*ptr = per_cpu(arm64_ssbd_callback_required, cpu);
> 
> Hmm. Is this correct for late arriving CPUs, where we don't know whether
> a callback is required at the point we do the copy?
> 
> That sounds fiddly to resolve, but this _might_ all be moot because I'm
> about to post a series that allows us to remove the hyp mapping of this
> variable entirely. So leave this for now, but maybe stick a comment in
> that it doesn't work for late cpus.

Ah, good point. I'll move the value copy at the end of cpu_init_hyp_mode().
It must be known at that point. And if your series gets rid of this completely,
even better.