[MODERATED] Re: [PATCH v5 6/8] NX 6

Ben Hutchings <[email protected]> Thu, 10 Oct 2019 00:05:32 +0100

Newsgroups	org.kernel.lore.historical-speck
Message-ID	<[email protected]>

On Wed, 2019-10-09 at 15:52 -0700, speck for Junaid Shahid wrote:
> 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

I found that but I wasn't confident that it was safe to call from this
context.

Ben.

-- 
Ben Hutchings
Humans are not rational beings; they are rationalising beings.

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