From: Josh Boyer <jwboyer@fedoraproject.org>
To: Chuck Ebbert <cebbert.lkml@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>,
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 09:14:50 -0400 [thread overview]
Message-ID: <CA+5PVA7HTU_N0U5xxeGi3DJ_HCz9VjUfNsO23wJDT74J5xxLcQ@mail.gmail.com> (raw)
In-Reply-To: <20140919075415.5149d5f2@as>
On Fri, Sep 19, 2014 at 8:54 AM, Chuck Ebbert <cebbert.lkml@gmail.com> wrote:
> 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.
How would you accomplish that when applying a microcode update
requires userspace? Or did you mean "before we transition out of the
initramfs"?
josh
next prev parent reply other threads:[~2014-09-19 13:14 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
2014-09-19 13:14 ` Josh Boyer [this message]
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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