linux-kernel - Re: [PATCH v4 5/5] x86: drop mfence in favor of lock+addl

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 for Android: free password hash cracker in your pocket

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

Message-ID: <CA+55aFzcDiKjz8yzRf9ET7Qc-qeNFP5bO0qW7o2cB9G9=yXHng@mail.gmail.com>
Date:	Wed, 27 Jan 2016 09:37:45 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Davidlohr Bueso <dave@...olabs.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Davidlohr Bueso <dbueso@...e.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	virtualization <virtualization@...ts.linux-foundation.org>,
	Borislav Petkov <bp@...en8.de>,
	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...hat.com>,
	Andy Lutomirski <luto@...nel.org>,
	Andrey Konovalov <andreyknvl@...gle.com>,
	Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH v4 5/5] x86: drop mfence in favor of lock+addl

On Wed, Jan 27, 2016 at 7:10 AM, Michael S. Tsirkin <mst@...hat.com> wrote:
>
> -#define __smp_mb()     mb()
> +#define __smp_mb()     asm volatile("lock; addl $0,-4(%%esp)" ::: "memory", "cc")

So this doesn't look right for x86-64. Using %esp rather than %rsp.
How did that even work for you?

                Linus