linux-kernel - Re: [PATCH 0/2] Fix resume failure due to PCID

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Message-ID: <20170907085904.unjug5iv4rk5enye@pd.tnic>
Date:   Thu, 7 Sep 2017 10:59:04 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     X86 ML <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 0/2] Fix resume failure due to PCID

On Wed, Sep 06, 2017 at 07:54:52PM -0700, Andy Lutomirski wrote:
> Patch 1 is the fix.  Patch 2 is a comment that would have kept me from
> chasing down a false lead.
> 
> I've tested patch 2 using CPU hotplug and suspend/resume.  I haven't
> tested hibernation or kexec because I don't know how.  (If I do
> systemctl hibernate on my laptop, it happily writes out a hiberation
> image somewhere and then it equally happily ignores it on the next
> boot.

Do you have this in cmdline?

        resume=         [SWSUSP]
                        Specify the partition device for software suspend
                        Format:
                        {/dev/<dev> | PARTUUID=<uuid> | <int>:<int> | <hex>}



> I don't know how to test kexec.)

You boot with something like this:

crashkernel=512M-2G:128M,2G-64G:256M,64G-:512M

Check dmesg to see whether it managed to reserve memory. Then you do:

# kexec --noefi -l bzImage --initrd=initrd.img --reuse-cmdline

# kexec -e

That last one loads it.

Anyway, something like that. I have this in my notes saying it worked at
some point.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--