linux-kernel - Re: perf with precise attribute kills all KVM based VMs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20120709145442.GE7298@redhat.com>
Date:	Mon, 9 Jul 2012 17:54:42 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	David Ahern <dsahern@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: perf with precise attribute kills all KVM based VMs

On Mon, Jul 09, 2012 at 05:51:29PM +0300, Avi Kivity wrote:
> On 07/09/2012 05:49 PM, Peter Zijlstra wrote:
> > On Mon, 2012-07-09 at 08:47 -0600, David Ahern wrote:
> >> 
> >> I found this testing changes to perf-kvm, but found the problem extends 
> >> to just perf-record. With perf-record exclude_guest defaults to 1. See 
> >> tools/perf/util/util.c, event_attr_init(). 
> > 
> > You lost me there.. so perf-record defaults to exclude_guest=1 (which
> > would make the proposed patch I just send actually possible), but its
> > still going *bang* ?
> 
> It's possible that the DS writes overshoot the MSR... or that there's a
> bug somewhere.
> 
I hope it is the later, because we can do nothing with the former.

--
			Gleb.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/