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From: Chuck Ebbert <cebbert.lkml@gmail.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
	Andy Lutomirski <luto@amacapital.net>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: x86, microcode: BUG: microcode update that changes x86_capability
Date: Fri, 19 Sep 2014 07:54:14 -0500	[thread overview]
Message-ID: <20140919075415.5149d5f2@as> (raw)
In-Reply-To: <20140919112953.GA3256@nazgul.tnic>

On Fri, 19 Sep 2014 13:29:53 +0200
Borislav Petkov <bp@alien8.de> wrote:

> On Fri, Sep 19, 2014 at 08:00:15AM -0300, Henrique de Moraes Holschuh wrote:
> > We're also killing microcode update support outside of the initramfs in
> > Debian.  It has become obvious that anything other than the early initramfs
> > method of microcode updates should be considered a developer thing.
> 
> That's simply not true: long-running systems which you can't reboot for
> whatever reason will need the late microcode update.
> 

Assuming we can identify all the affected models and steppings, maybe
something like this would work:

1) Refuse to finish booting if a microcode update that disables TSX
isn't applied before userspace starts running on those CPUs.

and/or

2) Don't allow a late update if TSX is still enabled on those
processors.

(1) could be overridden by a command line option for people who want to
develop TSX code.

  reply	other threads:[~2014-09-19 12:54 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-18 13:52 x86, microcode: BUG: microcode update that changes x86_capability Henrique de Moraes Holschuh
2014-09-18 19:14 ` Andy Lutomirski
2014-09-18 19:53   ` Chuck Ebbert
2014-09-18 19:55     ` H. Peter Anvin
2014-09-18 20:06       ` Henrique de Moraes Holschuh
2014-09-19  0:13         ` Henrique de Moraes Holschuh
2014-09-19  0:23           ` Andy Lutomirski
2014-09-19  0:28             ` H. Peter Anvin
2014-09-19  1:00               ` Andy Lutomirski
2014-09-19  8:03                 ` Borislav Petkov
2014-09-19 11:00             ` Henrique de Moraes Holschuh
2014-09-19 11:29               ` Borislav Petkov
2014-09-19 12:54                 ` Chuck Ebbert [this message]
2014-09-19 13:14                   ` Josh Boyer
2014-09-19 13:37                     ` Chuck Ebbert
2014-09-19 15:00                   ` Borislav Petkov
2014-09-19 16:13                     ` Andy Lutomirski
2014-09-19 16:54                       ` Henrique de Moraes Holschuh
2014-09-19 16:42                     ` Henrique de Moraes Holschuh
2014-09-23 20:00                       ` Borislav Petkov
2014-09-24 14:56                         ` Henrique de Moraes Holschuh
2014-09-24 15:00                           ` Andy Lutomirski
2014-09-24 17:45                             ` Henrique de Moraes Holschuh
2014-09-24 17:48                               ` Andy Lutomirski
2014-09-24 18:59                                 ` Henrique de Moraes Holschuh
2014-09-24 19:34                                   ` Andy Lutomirski
2014-09-25  8:57                               ` Borislav Petkov
2014-09-25  8:51                           ` Borislav Petkov
2014-09-25 11:36                             ` Henrique de Moraes Holschuh
2014-09-25 12:10                               ` Borislav Petkov
2014-09-25 14:40                                 ` Henrique de Moraes Holschuh
2014-09-25 14:56                                   ` Borislav Petkov
2014-09-25 15:30                                     ` Henrique de Moraes Holschuh
2014-09-25 15:50                                       ` Borislav Petkov
2014-09-25 16:41                                         ` Henrique de Moraes Holschuh
2014-09-25 16:57                                           ` Borislav Petkov
2014-09-25 17:09                                             ` Henrique de Moraes Holschuh
2014-09-19 13:51                 ` Henrique de Moraes Holschuh
2014-09-19 14:49                   ` Borislav Petkov
2014-09-19 17:22                     ` Henrique de Moraes Holschuh
2014-09-19 22:35               ` Henrique de Moraes Holschuh
2014-09-29 11:51                 ` Henrique de Moraes Holschuh
2014-09-19  9:56     ` Henrique de Moraes Holschuh
2014-09-19 16:11   ` Henrique de Moraes Holschuh
2014-09-22  0:37 ` Andi Kleen
2014-09-22  0:51   ` H. Peter Anvin
2014-09-22  0:58     ` Andi Kleen

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