linux-kernel - Re: kexec reboot fails with extra wbinvd introduced for AME SME

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Date:   Thu, 18 Jan 2018 11:04:48 +0800
From:   Dave Young <dyoung@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Arjan van de Ven <arjan@...ux.intel.com>,
        Yu Chen <yu.c.chen@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Juergen Gross <jgross@...e.com>,
        Tony Luck <tony.luck@...el.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Borislav Petkov <bp@...en8.de>,
        Rui Zhang <rui.zhang@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Ingo Molnar <mingo@...nel.org>,
        Kexec Mailing List <kexec@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ebiederm@...hat.com, Tom Lendacky <thomas.lendacky@....com>,
        Baoquan He <bhe@...hat.com>
Subject: Re: kexec reboot fails with extra wbinvd introduced for AME SME

On 01/17/18 at 07:00pm, Linus Torvalds wrote:
> On Wed, Jan 17, 2018 at 6:57 PM, Dave Young <dyoung@...hat.com> wrote:
> >
> > Could you say more about how to check this? My .config disabled
> > CONFIG_X86_MCE, should this be enabled?
> 
> By all means, try it.
> 
> Some pending machine check exception that we have *not* reacted to,
> and that is pending around kexec boot could very possibly be relevant.
> 
> I forget your exact symptoms. Was it that the _first_ kexec works, but
> the second one hangs? Or was that the other unrelated issue? Or have I
> confused this with some other report entirely?

Yes, 1st kexec works, 2nd hangs.

Rebuilding with MCE enabled now.

Thanks
Dave
> 
>                Linus