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Date: Thu, 4 Jan 2018 17:34:09 +0100 (CET)
From: Thomas Gleixner <tglx@linutronix.de>
Subject: Re: "bad pmd" errors + oops with KPTI on 4.14.11 after loading X.509
 certs
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To: Andy Lutomirski <luto@kernel.org>
Cc: Benjamin Gilbert <benjamin.gilbert@coreos.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, X86 ML <x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>, linux-mm@kvack.org, stable <stable@vger.kernel.org>, Ingo Molnar <mingo@kernel.org>, Dave Hansen <dave.hansen@linux.intel.com>, Peter Zijlstra <peterz@infradead.org>, Thomas Garnier <thgarnie@google.com>, Alexander Kuleshov <kuleshovmail@gmail.com>

On Thu, 4 Jan 2018, Andy Lutomirski wrote:
> On Thu, Jan 4, 2018 at 4:28 AM, Thomas Gleixner <tglx@linutronix.de> wrote:
> > --- a/arch/x86/include/asm/pgtable_64_types.h
> > +++ b/arch/x86/include/asm/pgtable_64_types.h
> > @@ -88,7 +88,7 @@ typedef struct { pteval_t pte; } pte_t;
> >  # define VMALLOC_SIZE_TB       _AC(32, UL)
> >  # define __VMALLOC_BASE                _AC(0xffffc90000000000, UL)
> >  # define __VMEMMAP_BASE                _AC(0xffffea0000000000, UL)
> > -# define LDT_PGD_ENTRY         _AC(-4, UL)
> > +# define LDT_PGD_ENTRY         _AC(-3, UL)
> >  # define LDT_BASE_ADDR         (LDT_PGD_ENTRY << PGDIR_SHIFT)
> >  #endif
> 
> If you actually change the memory map order, you need to change the
> shadow copy in mm/dump_pagetables.c, too.  I have a draft patch to
> just sort the damn list, but that's not ready yet.

Yes, I forgot that in the first attempt. Noticed myself when dumping it,
but that should be irrelevant to figure out whether it fixes the problem at
hand.

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