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

[Ingo Molnar]

* Mike Galbraith <efault@xxxxxx> 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@xxxxxxxx>
    - boot crash fix from:            Tom Lendacky <thomas.lendacky@xxxxxxx>
    - crash bisected by:              Mike Galbraith <efault@xxxxxx>

    ...
    
    Reported-and-fixed-by: Arnd Bergmann <arnd@xxxxxxxx>
    Fixed-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
    Bisected-by: Mike Galbraith <efault@xxxxxx>

Thanks,

	Ingo