From: Peter Zijlstra <peterz@infradead.org>
To: Gleb Natapov <gleb@redhat.com>
Cc: David Ahern <dsahern@gmail.com>, Avi Kivity <avi@redhat.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: perf with precise attribute kills all KVM based VMs
Date: Mon, 09 Jul 2012 16:24:04 +0200 [thread overview]
Message-ID: <1341843844.3462.75.camel@twins> (raw)
In-Reply-To: <20120709141904.GC7298@redhat.com>
On Mon, 2012-07-09 at 17:19 +0300, Gleb Natapov wrote:
> Yes, this is knows problem that I can't find time to fix. The crash is
> cause by CPU using host PEBS virtual address while guest is running
> which causes guest memory corruption. We should disable evens that use
> PEBS at the guest entry.
Whoops.. so the hardware is reading the DS address as programmed by the
host (host linear address) and using it as a guest linear address?
Quality stuff..
Disabling PEBS events for guests isn't pretty though.. but I guess the
only alternative is mapping the DS into the guest and reprogramming
MSR_IA32_DS_AREA which is all a little involved I suppose?
next prev parent reply other threads:[~2012-07-09 14:24 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-09 14:12 perf with precise attribute kills all KVM based VMs David Ahern
2012-07-09 14:19 ` Gleb Natapov
2012-07-09 14:24 ` Peter Zijlstra [this message]
2012-07-09 14:36 ` Gleb Natapov
2012-07-09 14:39 ` Avi Kivity
2012-07-09 14:47 ` David Ahern
2012-07-09 14:49 ` Peter Zijlstra
2012-07-09 14:51 ` Avi Kivity
2012-07-09 14:54 ` Gleb Natapov
2012-07-09 14:57 ` Gleb Natapov
2012-07-09 14:59 ` Peter Zijlstra
2012-07-10 23:38 ` David Ahern
2012-07-11 7:10 ` Gleb Natapov
2012-07-11 9:49 ` Peter Zijlstra
2012-07-11 9:53 ` Gleb Natapov
2012-07-11 13:34 ` David Ahern
2012-07-12 4:11 ` David Ahern
2012-07-12 4:29 ` Gleb Natapov
2012-07-12 15:20 ` David Ahern
2012-07-12 16:06 ` Gleb Natapov
2012-07-12 16:13 ` Gleb Natapov
2012-07-12 16:58 ` Peter Zijlstra
2012-07-16 1:51 ` David Ahern
2012-07-15 8:07 ` Avi Kivity
2012-07-15 13:00 ` David Ahern
2012-07-15 13:03 ` Avi Kivity
2012-07-16 1:52 ` David Ahern
2012-07-16 2:19 ` David Ahern
2012-07-20 23:34 ` David Ahern
2012-07-22 9:52 ` Avi Kivity
2012-07-09 14:52 ` David Ahern
2012-07-09 14:58 ` David Ahern
2012-07-09 15:18 ` David Ahern
2012-07-09 14:47 ` Peter Zijlstra
2012-07-20 23:35 ` David Ahern
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