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Subject: Re: kexec reboot fails with extra wbinvd introduced for AME SME
To: Linus Torvalds <torvalds@linux-foundation.org>,
        Dave Young <dyoung@redhat.com>
Cc: 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>
References: <20171213025256.GA1913@dhcp-128-65.nay.redhat.com>
 <20171213155746.GA29572@yu-chen.sh.intel.com>
 <20171214092429.GA2004@dhcp-128-65.nay.redhat.com>
 <20180104031537.GA1819@dhcp-128-65.nay.redhat.com>
 <20180117072123.GA1866@dhcp-128-65.nay.redhat.com>
 <CA+55aFxCuz2K_kE3Huu3Ar32LVmWav__2CPL_=zs2g0devx9-Q@mail.gmail.com>
 <20180118014705.GA1812@dhcp-128-65.nay.redhat.com>
 <CA+55aFzc9eXKOdhS-ygQPbr0_N84d8iE8WbSGOWmpJXr1rvDjQ@mail.gmail.com>
From: Arjan van de Ven <arjan@linux.intel.com>
Message-ID: <47fe0d37-93d9-1394-062a-f973a38daa16@linux.intel.com>
Date: Wed, 17 Jan 2018 18:53:34 -0800
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> 
> 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)