linux-kernel - Re: [RFC] perf/x86/intel: Export mem events only if there's PEBs support

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: <20180813185805.GA10097@tassilo.jf.intel.com>
Date:   Mon, 13 Aug 2018 11:58:05 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: [RFC] perf/x86/intel: Export mem events only if there's PEBs
 support

On Mon, Aug 13, 2018 at 05:48:20PM +0200, Jiri Olsa wrote:
> hi,
> we had some reports that we show mem* events on KVM servers
> where they are not available, this patch hides them if there's
> no PEBs available
> 
> currently on those servers we fail to open mem* events,
> because we can't access LDLAT msr
> 
> however that's not so easy/straight forward to check,
> so I thought we could use check on PEBs instead, which
> needs to be there for mem events as well and seems to
> be enough to check
> 
> thoughts? thanks,
> jirka

Acked-by: Andi Kleen <ak@...ux.intel.com>

-Andi