From: Greg KH <gregkh@linuxfoundation.org>
To: Borislav Petkov <bp@alien8.de>
Cc: Rolf Neugebauer <rolf.neugebauer@docker.com>,
Jia Zhang <zhang.jia@linux.alibaba.com>,
Thomas Gleixner <tglx@linutronix.de>,
Tony Luck <tony.luck@intel.com>, Ingo Molnar <mingo@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, LKML <linux-kernel@vger.kernel.org>
Subject: Re: x86/microcode/intel: Division by zero panic in 4.9.79 and 4.4.114
Date: Wed, 7 Feb 2018 06:34:28 -0800 [thread overview]
Message-ID: <20180207143428.GA31944@kroah.com> (raw)
In-Reply-To: <20180206142444.7xxegyyyfwskwrxl@pd.tnic>
On Tue, Feb 06, 2018 at 03:24:44PM +0100, Borislav Petkov wrote:
> On Tue, Feb 06, 2018 at 02:09:35PM +0000, Rolf Neugebauer wrote:
> > The backport of 7e702d17ed1 ("x86/microcode/intel: Extend BDW
> > late-loading further with LLC size check") to 4.9.79 and 4.4.14 causes
> > a division by zero panic on some single vCPU machine types on Google
> > Cloud (e.g. g1-small and n1-standard-1):
>
> The microcode loader is not supposed to load in a guest.
>
> Greg, I guess you need something like this:
>
> a15a753539ec ("x86/microcode/AMD: Do not load when running on a hypervisor")
>
> I haven't tried whether it applies cleanly though...
It applied cleanly to 4.9 (with some fuzz, but looks clean enough...)
But for 4.4, not at all. Rolf, any chance you could backport the patch
there for this issue? If not, I can add it to my queue, but it might
take a few days...
thanks,
greg k-h
next prev parent reply other threads:[~2018-02-07 14:34 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-06 14:09 x86/microcode/intel: Division by zero panic in 4.9.79 and 4.4.114 Rolf Neugebauer
2018-02-06 14:24 ` Borislav Petkov
2018-02-07 14:34 ` Greg KH [this message]
2018-02-07 16:31 ` Rolf Neugebauer
2018-02-07 18:12 ` Borislav Petkov
2018-02-08 13:55 ` Rolf Neugebauer
2018-02-08 14:53 ` Borislav Petkov
2018-02-08 16:25 ` Rolf Neugebauer
2018-02-08 16:39 ` Greg KH
2018-02-08 17:12 ` [PATCH 1/2] x86/microcode/AMD: Do not load when running on a hypervisor Rolf Neugebauer
2018-02-08 17:12 ` [PATCH 2/2] x86/microcode: Do the family check first Rolf Neugebauer
2018-02-08 17:25 ` Greg KH
2018-02-08 18:26 ` x86/microcode/intel: Division by zero panic in 4.9.79 and 4.4.114 Borislav Petkov
2018-02-08 16:39 ` Greg KH
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180207143428.GA31944@kroah.com \
--to=gregkh@linuxfoundation.org \
--cc=bp@alien8.de \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=rolf.neugebauer@docker.com \
--cc=tglx@linutronix.de \
--cc=tony.luck@intel.com \
--cc=x86@kernel.org \
--cc=zhang.jia@linux.alibaba.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox