linux-kernel - RE: GPF in intel_pmu_lbr_reset() with qemu -cpu host

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Date:	Wed, 26 Mar 2014 07:23:04 +0000
From:	"Wu, Feng" <feng.wu@...el.com>
To:	Peter Wu <peter@...ensteyn.nl>, Gleb Natapov <gleb@...nel.org>
CC:	Venkatesh Srinivas <venkateshs@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: RE: GPF in intel_pmu_lbr_reset() with qemu -cpu host



> -----Original Message-----
> From: kvm-owner@...r.kernel.org [mailto:kvm-owner@...r.kernel.org] On
> Behalf Of Peter Wu
> Sent: Sunday, March 23, 2014 6:00 AM
> To: Gleb Natapov
> Cc: Venkatesh Srinivas; Peter Zijlstra; Ingo Molnar; Andi Kleen; Linux Kernel
> Developers List; H. Peter Anvin; kvm@...r.kernel.org; Paolo Bonzini
> Subject: Re: GPF in intel_pmu_lbr_reset() with qemu -cpu host
> 
> On Saturday 22 March 2014 14:27:59 Gleb Natapov wrote:
> > > but now I have a NULL dereference (in rapl_pmu_init). Previously, when
> > > `-cpu SandyBridge` was passed to qemu, it would show this:
> > >
> > >     [    0.016995] Performance Events: unsupported p6 CPU model 42
> no PMU driver, software events only.
> > >
> > > The same NULL pointer deref would be visible (slightly different
> > > addresses, but the Code lines are equal). With `-host`, the NULL deref
> > > with `-cpu host` contains:
> > >
> > >     [    0.016445] Performance Events: 16-deep LBR, IvyBridge events,
> Intel PMU driver.
> > >
> > > Full dmesg below.
> > >
> > I am confused. Do you see crash now with -cpu SandyBridge and -cpu host, or
> -cpu host only?
> 
> The RAPL crash is seen with both SandyBridge and host, I mentioned SB
> because that environment should be more constant than "host" (which
> depends on the CPU you have on, well, the host).
> 
> Peter

Is there a solution for this issue right now? I also met this GPF crash.

> 
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Thanks,
Feng
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