linux-kernel - Re: [PATCH v1 0/4] Enable LBR for the guest

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]

Date:   Mon, 25 Sep 2017 07:59:08 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Wei Wang <wei.w.wang@...el.com>
Cc:     virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, pbonzini@...hat.com, mst@...hat.com,
        rkrcmar@...hat.com, mingo@...hat.com
Subject: Re: [PATCH v1 0/4] Enable LBR for the guest

On Mon, Sep 25, 2017 at 12:44:52PM +0800, Wei Wang wrote:
> This patch series enables the Last Branch Recording feature for the
> guest. Instead of trapping each LBR stack MSR access, the MSRs are
> passthroughed to the guest. Those MSRs are switched (i.e. load and
> saved) on VMExit and VMEntry.
> 
> Test:
> Try "perf record -b ./test_program" on guest.

I don't see where you expose the PERF capabilities MSR? 

That's normally needed for LBR too to report the version
number.

-Andi