Re: [RFC PATCH 09/27] KVM: arm64: Allow using kvm_nvhe_sym() in hyp code

[Quentin Perret]

On Monday 23 Nov 2020 at 12:57:23 (+0000), David Brazdil wrote:
> > diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
> > index 882eb383bd75..391cf6753a13 100644
> > --- a/arch/arm64/kvm/arm.c
> > +++ b/arch/arm64/kvm/arm.c
> > @@ -1369,7 +1369,7 @@ static void cpu_prepare_hyp_mode(int cpu)
> >  
> >  	params->vector_hyp_va = kern_hyp_va((unsigned long)kvm_ksym_ref(__kvm_hyp_host_vector));
> >  	params->stack_hyp_va = kern_hyp_va(per_cpu(kvm_arm_hyp_stack_page, cpu) + PAGE_SIZE);
> > -	params->entry_hyp_va = kern_hyp_va((unsigned long)kvm_ksym_ref(__kvm_hyp_psci_cpu_entry));
> > +	params->entry_hyp_va = kern_hyp_va((unsigned long)kvm_ksym_ref_nvhe(__kvm_hyp_psci_cpu_entry));
> 
> Why is this change needed?

You mean this line specifically or the whole __kvm_hyp_psci_cpu_entry
thing?

For the latter, it is to avoid having the compiler complain about
__kvm_hyp_psci_cpu_entry being re-defined as a different symbol. If
there is a better way to solve this problem I'm happy to change it -- I
must admit I got a little confused with the namespacing along the way.

Thanks,
Quentin