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From: Borislav Petkov <bp@alien8.de>
To: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: X86 ML <x86@kernel.org>,
	Arjan Van De Ven <arjan.van.de.ven@intel.com>,
	Ashok Raj <ashok.raj@intel.com>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 7/7] x86/microcode: Synchronize late microcode loading
Date: Wed, 28 Feb 2018 15:08:06 +0100	[thread overview]
Message-ID: <20180228140806.GD3769@pd.tnic> (raw)
In-Reply-To: <20180228135931.uwveegfdv5afozxe@khazad-dum.debian.net>

On Wed, Feb 28, 2018 at 10:59:31AM -0300, Henrique de Moraes Holschuh wrote:
> Eek! If I read that right, this effectively halts the entire box until
> every core is updated, with one core entering deep-coma at a time (the
> rest are left either spinning or cpu_relax()ing

I think *you* should relax. :)

Late microcode loading on a long running box is not something you do
more than 2-3 times a year. And if the box needs to restart, it'll get
the early microcode.

And yes, this is addressing *late* loading, if you haven't noticed yet.
I added a big fat note *twice*:

"Before you read any further: the early loading method is still the
preferred one and you should always do that. This patchset is improving
the late loading mechanism for long running jobs and cloud use cases -
i.e., use cases where early loading is, hm, a bit problematic."

So keep doing the early method and you'll be fine.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

  reply	other threads:[~2018-02-28 14:08 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-28 10:28 [PATCH 0/7] x86/microcode: Improve late loading Borislav Petkov
2018-02-28 10:28 ` [PATCH 1/7] x86/microcode: Get rid of struct apply_microcode_ctx Borislav Petkov
2018-03-08  9:25   ` [tip:x86/pti] " tip-bot for Borislav Petkov
2018-02-28 10:28 ` [PATCH 2/7] x86/microcode/intel: Check microcode revision before updating sibling threads Borislav Petkov
2018-03-08  9:25   ` [tip:x86/pti] " tip-bot for Ashok Raj
2018-02-28 10:28 ` [PATCH 3/7] x86/microcode/intel: Writeback and invalidate caches before updating microcode Borislav Petkov
2018-03-08  9:26   ` [tip:x86/pti] " tip-bot for Ashok Raj
2018-02-28 10:28 ` [PATCH 4/7] x86/microcode: Do not upload microcode if CPUs are offline Borislav Petkov
2018-02-28 13:11   ` Henrique de Moraes Holschuh
2018-02-28 13:26     ` Raj, Ashok
2018-02-28 19:07       ` Henrique de Moraes Holschuh
2018-03-05 22:06   ` Tom Lendacky
2018-03-08  9:26   ` [tip:x86/pti] " tip-bot for Ashok Raj
2018-02-28 10:28 ` [PATCH 5/7] x86/microcode/intel: Look into the patch cache first Borislav Petkov
2018-03-08  9:27   ` [tip:x86/pti] " tip-bot for Borislav Petkov
2018-02-28 10:28 ` [PATCH 6/7] x86/microcode: Request microcode on the BSP Borislav Petkov
2018-03-05 22:08   ` Tom Lendacky
2018-03-08  9:27   ` [tip:x86/pti] " tip-bot for Borislav Petkov
2018-02-28 10:28 ` [PATCH 7/7] x86/microcode: Synchronize late microcode loading Borislav Petkov
2018-02-28 13:59   ` Henrique de Moraes Holschuh
2018-02-28 14:08     ` Borislav Petkov [this message]
2018-02-28 17:48       ` Henrique de Moraes Holschuh
2018-03-05 22:09   ` Tom Lendacky
2018-03-08  9:28   ` [tip:x86/pti] " tip-bot for Ashok Raj
2018-03-05 22:12 ` [PATCH 0/7] x86/microcode: Improve late loading Tom Lendacky
2018-03-05 23:51   ` Raj, Ashok

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