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From: Andi Kleen <andi@firstfloor.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andi Kleen <andi@firstfloor.org>, Peter Wu <peter@lekensteyn.nl>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@kernel.org>,
	linux-kernel@vger.kernel.org
Subject: Re: GPF in intel_pmu_lbr_reset() with qemu -cpu host
Date: Sat, 22 Mar 2014 01:30:56 +0100	[thread overview]
Message-ID: <20140322003056.GQ22728@two.firstfloor.org> (raw)
In-Reply-To: <532CD8A9.5080603@zytor.com>

On Fri, Mar 21, 2014 at 05:26:17PM -0700, H. Peter Anvin wrote:
> On 03/21/2014 05:22 PM, Andi Kleen wrote:
> >> Actually, Ingo, Borislav and I have been discussing making rdmsr_safe()
> >> more of the default, especially for things like this where the error
> >> handling is obvious (doesn't work?  Disable the PMU.)
> > 
> > That would be completely wrong. KVM has a full architectural perfmon PMU,
> > just no model specific extensions like LBR.
> > 
> 
> s/PMU/PMU extension in question/

%  grep -r 'rdmsr' arch/x86/*  | grep -v safe | wc -l
285

I assume it'll keep you all busy for a while.

[compared to a likely one liner in KVM]

-Andi

  reply	other threads:[~2014-03-22  0:31 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-03-21 17:42 GPF in intel_pmu_lbr_reset() with qemu -cpu host Peter Wu
2014-03-21 17:46 ` Peter Wu
2014-03-21 19:04   ` Venkatesh Srinivas
2014-03-21 19:09     ` H. Peter Anvin
2014-03-22  7:54       ` Paolo Bonzini
2014-03-22  8:50     ` Gleb Natapov
2014-03-22 10:05       ` Peter Wu
2014-03-22 12:27         ` Gleb Natapov
2014-03-22 21:46           ` H. Peter Anvin
2014-03-22 22:00           ` Peter Wu
2014-03-26  7:23             ` Wu, Feng
2014-03-26  9:38               ` Paolo Bonzini
2014-03-21 19:29 ` Andi Kleen
2014-03-21 20:46   ` H. Peter Anvin
2014-03-21 21:37     ` Andi Kleen
2014-03-21 21:41       ` H. Peter Anvin
2014-03-21 21:48         ` Andi Kleen
2014-03-21 21:55           ` H. Peter Anvin
2014-03-22  0:22             ` Andi Kleen
2014-03-22  0:26               ` H. Peter Anvin
2014-03-22  0:30                 ` Andi Kleen [this message]
2014-03-22  0:34                   ` H. Peter Anvin
2014-03-22 10:01                     ` Borislav Petkov

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