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Date:   Thu, 18 Jan 2018 11:31:18 +0800
From:   Dave Young <dyoung@redhat.com>
To:     Linus Torvalds <torvalds@linux-foundation.org>
Cc:     Arjan van de Ven <arjan@linux.intel.com>,
        Yu Chen <yu.c.chen@intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Juergen Gross <jgross@suse.com>,
        Tony Luck <tony.luck@intel.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Borislav Petkov <bp@alien8.de>,
        Rui Zhang <rui.zhang@intel.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Ingo Molnar <mingo@kernel.org>,
        Kexec Mailing List <kexec@lists.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        ebiederm@redhat.com, Tom Lendacky <thomas.lendacky@amd.com>,
        Baoquan He <bhe@redhat.com>
Subject: Re: kexec reboot fails with extra wbinvd introduced for AME SME
Message-ID: <20180118033118.GA1838@dhcp-128-65.nay.redhat.com>
References: <20171214092429.GA2004@dhcp-128-65.nay.redhat.com>
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On 01/18/18 at 11:04am, Dave Young wrote:
> On 01/17/18 at 07:00pm, Linus Torvalds wrote:
> > On Wed, Jan 17, 2018 at 6:57 PM, Dave Young <dyoung@redhat.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.

dmesg only shows "mce: CPU supports 7 MCE banks"
Nothing special happens with MCE enabled , anyway thank all for
the hints, I will continue to think about this and maybe try more experiments.

> 
> Thanks
> Dave
> > 
> >                Linus