linux-kernel - Re: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge

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Message-ID: <4FD78BE6.4060207@zytor.com>
Date:	Tue, 12 Jun 2012 11:35:18 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Stephane Eranian <eranian@...gle.com>
CC:	linux-kernel@...r.kernel.org, peterz@...radead.org,
	andi@...stfloor.org, mingo@...e.hu, ming.m.lin@...el.com,
	Borislav Petkov <bp@...64.org>,
	"Yu, Fenghua" <fenghua.yu@...el.com>
Subject: Re: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge

Andi just alerted me to this thread.

I, Thomas and Borislav discussed this at LCE last year, and it really
comes up that we have a *large* number of reasons to load microcode
early.  We then need to keep the microcode around so that it can be
loaded on APs, hotplug CPUs, and after S3 resume.

The protocol discussion happened in this thread:

http://marc.info/?i=1332512984-79664-1-git-send-email-trenn@suse.de

Fenghua Yu at Intel is currently working on the implementation.

	-hpa
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