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

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Date:   Wed, 17 Jan 2018 18:53:34 -0800
From:   Arjan van de Ven <arjan@...ux.intel.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Dave Young <dyoung@...hat.com>
Cc:     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

> 
> Does anybody have any other ideas?

wbinvd is thankfully not common, but also not rare (MTRR setup and a bunch of other cases)
and in some other operating systems it happens even more than on Linux.. it's generally not totally broken like this.

I can only imagine a machine check case where a write back to a bad cell causes some parity error
or something...  but it's odd that no other machine checks are reported?
(can the user check for this please)