Hi Simon,
On Mon, Sep 16, 2019 at 12:53 PM Simon Horman <ho...@verge.net.au> wrote:
>
> On Mon, Sep 09, 2019 at 10:33:11AM +0530, Bhupesh Sharma wrote:
> > Sorry Guys,
> >
> > On Tue, Sep 3, 2019 at 11:36 PM Donald Buczek <buc...@molgen.mpg.de> wrote:
> > >
> > > Dear Simon,
> > >
> > > On 03.09.19 16:41, Simon Horman wrote:
> > > > On Fri, Aug 30, 2019 at 11:12:58AM +0200, Donald Buczek wrote:
> > > >> Linux kernel commit d52888aa2753 ("x86/mm: Move LDT remap out of KASLR
> > > >> region on 5-level paging") changed the base of the direct mapping
> > > >> from 0xffff880000000000 to 0xffff888000000000. This was merged
> > > >> into v4.20-rc2.
> > > >>
> > > >> Update to new address accordingly.
> > > >
> > > > Thanks, applied for inclusion in v2.0.20.
> > >
> > > I must admit, that I overlooked that d52888aa2753 ("x86/mm: Move LDT
> > > remap out of KASLR region on 5-level paging") was backported to 4.19.5 as
> > > 4074ca7d8a18 ("x86/mm: Move LDT remap out of KASLR region on 5-level
> > > paging").
> > >
> > > Bhupesh Sharma wanted to look into a a dynamic solution, which, of
> > > course, would be better. But if you still want to include this (e.g. as
> > > the fallback for the dynamic solution), you might want to replace the
> > > patch with the following one, which selects the new PAGE_OFFSET starting
> > > from kernel version 4.19.5 instead of 4.20.0.
> >
> > I was in a conference last week and was not able to connect to my test
> > machine(s) to develop and test a more generic fix, as I suggested in
> > my earlier message.
> >
> > I will try to work on and send a generic fix in a couple of days.
>
> Thanks,
>
> I think it would be best if this patch,
> 23b67f048dde ("x86: Fix PAGE_OFFSET for kernels since 4.20"),
> was reverted.
>
> Donald, Bhupesh, what do you think?
I am still working on a correct fix for this issue, so I would think
we can keep Donald' patch for now.
Once my fix is ready and it is accepted after reviews, I think we can
revert Donald's patch.
Thanks,
Bhupesh
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