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From: "Måns Rullgård" <mans@mansr.com>
To: Borislav Petkov <bp@suse.de>
Cc: Thomas Voegtle <tv@lio96.de>,
	Markus Trippelsdorf <markus@trippelsdorf.de>,
	linux-kernel@vger.kernel.org
Subject: Re: x86/microcode update on systems without INITRD
Date: Fri, 08 Jan 2016 11:46:28 +0000	[thread overview]
Message-ID: <yw1xegdsz42z.fsf@unicorn.mansr.com> (raw)
In-Reply-To: <20160108113641.GE14673@pd.tnic> (Borislav Petkov's message of "Fri, 8 Jan 2016 12:36:41 +0100")

Borislav Petkov <bp@suse.de> writes:

> On Fri, Jan 08, 2016 at 11:18:51AM +0000, Måns Rullgård wrote:
>> Neither "depends on" nor "select" makes sense to me here.  The driver
>> apparently works without it,
>
> The driver works without it if you build your microcode into the kernel.
>
> There are use cases where building microcode into the kernel is *not* a
> viable option so we have to support both builtin microcode and microcode
> from the initrd.

How is an initrd different from a real filesystem as seen by the
microcode update driver?

>> and simply having BLK_DEV_INITRD enabled doesn't prevent improper
>> (according to some people) use of the driver. If updating microcode
>> is inherently unsafe when a real disk is mounted, the driver ought
>> to detect this and refuse the operation (possibly with an override
>> option).
>
> Huh, what?
>
> -ENOPARSE.

The objection against removing the dependency was that updating
microcode "late" isn't safe.  I don't see how turning on BLK_DEV_INITRD
stops anyone doing those allegedly unsafe updates anyway.

-- 
Måns Rullgård

  reply	other threads:[~2016-01-08 11:46 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-19 21:43 x86/microcode update on systems without INITRD Markus Trippelsdorf
2015-11-19 21:55 ` Borislav Petkov
2015-11-19 22:58   ` Borislav Petkov
2015-11-20  7:19     ` Markus Trippelsdorf
2015-11-20  8:27       ` Borislav Petkov
2015-11-20  8:33         ` Markus Trippelsdorf
2015-11-20  8:48           ` Borislav Petkov
2015-11-20 11:24             ` [PATCH] x86/microcode: Initialize the driver late when facilities are up Borislav Petkov
2015-11-23 16:28               ` [tip:x86/urgent] " tip-bot for Borislav Petkov
2016-01-07 12:12         ` x86/microcode update on systems without INITRD Thomas Voegtle
2016-01-07 12:18           ` Borislav Petkov
2016-01-07 12:36             ` Thomas Voegtle
2016-01-07 12:41               ` Markus Trippelsdorf
2016-01-08  9:33                 ` Thomas Voegtle
2016-01-08 12:18                 ` Mike Keehan
2016-01-08 12:20                   ` Markus Trippelsdorf
2016-01-08 10:59               ` Borislav Petkov
2016-01-08 11:18                 ` Måns Rullgård
2016-01-08 11:36                   ` Borislav Petkov
2016-01-08 11:46                     ` Måns Rullgård [this message]
2016-01-08 12:08                       ` Borislav Petkov
2016-01-08 12:16                         ` Markus Trippelsdorf
2016-01-08 12:27                           ` Borislav Petkov
2016-01-08 12:28                             ` Måns Rullgård
2016-01-08 12:48                             ` Michal Marek
2016-01-08 13:37                               ` Borislav Petkov
2016-01-08 14:48                                 ` Michal Marek
2016-01-11 19:43                                   ` Borislav Petkov
2016-01-11 20:29                                     ` Måns Rullgård
2016-01-11 20:59                                       ` Borislav Petkov
2016-01-11 21:04                                         ` Måns Rullgård
2016-01-11 21:17                                           ` Borislav Petkov
2016-01-14 18:43                                             ` [RFC PATCH] x86/kconfig: Sanity-check config file during oldconfig Borislav Petkov
2016-01-18 13:36                                               ` Thomas Voegtle
2016-01-18 14:06                                                 ` Borislav Petkov
2016-01-18 14:11                                                   ` Måns Rullgård
2016-01-18 14:28                                                     ` Borislav Petkov
2016-01-18 14:41                                                     ` Borislav Petkov
2016-01-18 14:51                                                       ` Måns Rullgård
2016-01-18 15:39                                                         ` Borislav Petkov
2016-01-18 15:42                                                           ` Måns Rullgård
2016-01-19  8:20                                               ` [RFC] CONFIG_FORCE_MINIMALLY_SANE_CONFIG=y (was: Re: [RFC PATCH] x86/kconfig: Sanity-check config file during oldconfig) Ingo Molnar
2016-01-19  8:40                                                 ` Markus Trippelsdorf
2016-01-19  8:54                                                   ` Ingo Molnar
2016-01-19  9:45                                                     ` Borislav Petkov
2016-01-19  9:01                                                 ` Peter Zijlstra
2016-01-19  9:14                                                   ` Ingo Molnar
2016-01-19  9:43                                                 ` Borislav Petkov
2016-01-19  9:57                                                 ` [RFC] CONFIG_FORCE_MINIMALLY_SANE_CONFIG=y Michal Marek
2016-01-19 10:30                                                   ` [RFC] CONFIG_GENERIC_BOOTABLE_CONFIG=y Ingo Molnar
2016-01-19 17:22                                                     ` Linus Torvalds
2016-01-19 17:52                                                       ` Austin S. Hemmelgarn
2016-01-19 12:29                                                 ` [RFC] CONFIG_FORCE_MINIMALLY_SANE_CONFIG=y Måns Rullgård
2016-01-19 12:43                                                   ` Michal Marek
2016-01-19 12:57                                                     ` Måns Rullgård
2016-01-21 22:06                                                 ` [RFC] CONFIG_FORCE_MINIMALLY_SANE_CONFIG=y (was: Re: [RFC PATCH] x86/kconfig: Sanity-check config file during oldconfig) Kirill A. Shutemov
2016-03-09 13:08                                                   ` Ingo Molnar
2016-01-08 12:18                         ` x86/microcode update on systems without INITRD Måns Rullgård
2016-01-19 17:43           ` Borislav Petkov
2016-01-20  9:14             ` Thomas Voegtle
2016-01-20 11:15               ` Borislav Petkov

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