linux-kernel - Re: [PATCH 3/6] x86-mce: Clear CMCI enable on all claimed CMCI banks before reboot.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CA+8MBbLO0=0G2GHNd797JNcZuJ2ZOQuNuvyGRLehBq0VXNHOhA@mail.gmail.com>
Date:	Thu, 10 Jul 2014 11:27:00 -0700
From:	Tony Luck <tony.luck@...il.com>
To:	Havard Skinnemoen <hskinnemoen@...gle.com>
Cc:	Borislav Petkov <bp@...en8.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ewout van Bekkum <ewout@...gle.com>
Subject: Re: [PATCH 3/6] x86-mce: Clear CMCI enable on all claimed CMCI banks
 before reboot.

On Thu, Jul 10, 2014 at 10:56 AM, Havard Skinnemoen
<hskinnemoen@...gle.com> wrote:
> Even on kexec-enabled kernels, we might be doing a regular BIOS boot.
> Is there any way to detect that we're doing a kexec boot and only
> clearing the MSRs in that case?

I'm not sure if we should worry about that ... not having the code bloat
for the functions is kexec is not configured is a good goal. Worrying
about a few extra microseconds in the shutdown path if kexec is configured
but we are actually doing a normal shutdown/reboot doesn't seem as
big of a worry.

-Tony
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/