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

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Message-ID: <CA+55aFxbkR+9dXu-ECm-Lx8bxpJhq=b60x_WdUS3XB9WzMp9=w@mail.gmail.com>
Date:   Wed, 17 Jan 2018 19:00:47 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Dave Young <dyoung@...hat.com>
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 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?

               Linus