linux-kernel - Re: [PATCH 09/25] xen: Account for time stolen by Xen

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:	Wed, 25 Apr 2007 11:13:34 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andi Kleen <ak@...e.de>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	virtualization@...ts.osdl.org, lkml <linux-kernel@...r.kernel.org>,
	john stultz <johnstul@...ibm.com>,
	Keir Fraser <Keir.Fraser@...cam.ac.uk>
Subject: Re: [PATCH 09/25] xen: Account for time stolen by Xen

Andi Kleen wrote:
>> +
>> +	do {
>> +		state_time = state->state_entry_time;
>> +		barrier();
>>     
>
> Should be likely rmb

We discussed this, and decided that it wasn't necessary.  The state is
always updated by the current CPU, so if it changes under our feet it
will be because we were preempted, and so that should shoot down any
speculated reads.

    J

-
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/