On Wed, Sep 25, 2019 at 01:17:24AM +0200, Niklas Cassel wrote:
> On Thu, Sep 19, 2019 at 10:32:47PM +0200, Greg KH wrote:
> > On Mon, Sep 09, 2019 at 02:45:01PM +0200, Niklas Cassel wrote:
> > > Hello,
> > >
> > > I would like to request
> > > 2a355ec25729 ("arm64: kpti: Whitelist Cortex-A CPUs that don't implement the CSV3 field")
> > >
> > > to be backported to 4.19 stable.
> > >
> > > These CPUs are not susceptible to Meltdown, so enabling the mitigations
> > > for Meltdown (kpti) should be redundant, especially since we know that
> > > it can have a huge performance penalty for certain workloads.
> > >
> > > kpti will still be automatically enabled if KASLR is enabled.
> >
> > Now queued up, thanks.
> >
>
> Hello Greg, Will,
>
> How about applying this also to v4.14 stable?
> (Since kpti is also enabled on Cortex-A CPUs in v4.14.)
>
> 2a355ec25729 does not apply cleanly on v4.14.y,
> since a LOT of things have changed in the file.
>
> git log --oneline 2a355ec25729053bb9a1a89b6c1d1cdd6c3b3fb1 --not linux-stable/linux-4.14.y arch/arm64/kernel/cpufeature.c | wc -l
> 72
>
> However, I've attached a simple backport of the commit.
Thanks for the backport, now queued up.
greg k-h
