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Subject: Re: x86-tip.today (4cdf573) early instaboot
From: Mike Galbraith <efault@gmx.de>
To: Tom Lendacky <thomas.lendacky@amd.com>, Ingo Molnar <mingo@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>, LKML <linux-kernel@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Dave Hansen <dave.hansen@linux.intel.com>
Date: Tue, 10 Apr 2018 17:48:25 +0200
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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 "@"