linux-kernel - Re: x86-tip.today (4cdf573) early instaboot

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Date:   Thu, 12 Apr 2018 09:09:17 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Mike Galbraith <efault@....de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Arnd Bergmann <arnd@...db.de>,
        Tom Lendacky <thomas.lendacky@....com>
Cc:     Tom Lendacky <thomas.lendacky@....com>,
        Ingo Molnar <mingo@...e.hu>,
        LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: x86-tip.today (4cdf573) early instaboot


* Mike Galbraith <efault@....de> wrote:

> On Tue, 2018-04-10 at 09:06 -0500, Tom Lendacky wrote:
> > 
> > Just out of curiosity, can you try the following patch and see if it
> > fixes your reboot issue:
> 
> Yup, all better.
> 
> > diff --git a/arch/x86/boot/compressed/kaslr.c
> > b/arch/x86/boot/compressed/kaslr.c
> > index c5196d2..a0a50b9 100644
> > --- a/arch/x86/boot/compressed/kaslr.c
> > +++ b/arch/x86/boot/compressed/kaslr.c
> > @@ -55,7 +55,7 @@
> >  extern unsigned long get_cmd_line_ptr(void);
> > 
> >  /* Used by PAGE_KERN* macros: */
> > -pteval_t __default_kernel_pte_mask __read_mostly;
> > +pteval_t __default_kernel_pte_mask __read_mostly = ~0;
> > 
> >  /* Simplified build-specific string for starting entropy. */
> >  static const char build_str[] = UTS_RELEASE " (" LINUX_COMPILE_BY "@"

Thanks guys!

I ended up back-merging this fix (and another fix) into:

  fb43d6cb91ef: x86/mm: Do not auto-massage page protections

I added credits as:

    - printk format warning fix from: Arnd Bergmann <arnd@...db.de>
    - boot crash fix from:            Tom Lendacky <thomas.lendacky@....com>
    - crash bisected by:              Mike Galbraith <efault@....de>

    ...
    
    Reported-and-fixed-by: Arnd Bergmann <arnd@...db.de>
    Fixed-by: Tom Lendacky <thomas.lendacky@....com>
    Bisected-by: Mike Galbraith <efault@....de>

Thanks,

	Ingo