On 10/9/19 3:42 PM, speck for Ben Hutchings wrote:
> 
> I've started trying to backport the NX patches to stable branches, and
> I think I can take them back as far as 4.9.
> 
> However, kvm_mmu_zap_all() is a relatively new addition and looks hard
> to backport.  I intend to make the nx_huge_pages parameter read-only
> (0444 permissions) and delete this "if (new_val != old_val)" block. 
> Does that seem reasonable?
> 

You could also just replace the call to kvm_mmu_zap_all() with kvm_mmu_invalidate_zap_all_pages(), which is present as far back as 3.11

Thanks,
Junaid