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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Wed, 17 Jan 2018 19:00:47 -0800
Message-ID: <CA+55aFxbkR+9dXu-ECm-Lx8bxpJhq=b60x_WdUS3XB9WzMp9=w@mail.gmail.com>
Subject: Re: kexec reboot fails with extra wbinvd introduced for AME SME
To:     Dave Young <dyoung@redhat.com>
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>
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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?

               Linus