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

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Date:   Tue, 10 Apr 2018 17:48:25 +0200
From:   Mike Galbraith <efault@....de>
To:     Tom Lendacky <thomas.lendacky@....com>,
        Ingo Molnar <mingo@...nel.org>
Cc:     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

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 "@"