From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Vrabel Subject: Re: Linux'es SLUB incompatible with Xen? Date: Thu, 25 Sep 2014 11:47:23 +0100 Message-ID: <5423F2BB.6080009@citrix.com> References: <5423ED170200007800038C47@mail.emea.novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail6.bemta4.messagelabs.com ([85.158.143.247]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1XX6a8-0001Rr-Kq for xen-devel@lists.xenproject.org; Thu, 25 Sep 2014 10:47:28 +0000 In-Reply-To: <5423ED170200007800038C47@mail.emea.novell.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Jan Beulich , Boris Ostrovsky , Konrad Rzeszutek Wilk Cc: Juergen Gross , xen-devel List-Id: xen-devel@lists.xenproject.org On 25/09/14 09:23, Jan Beulich wrote: > Linux-Xen maintainers, > > are you aware that SLUB's use of percpu_cmpxchg16b_double() is > currently incompatible with Xen when run on old, not cmpxchg16b > capable x86-64 CPUs (the problem being this_cpu_cmpxchg16b_emu's > non-paravirtualized use of CLI)? Or is that a simple "we don't care - > don't run Xen on such old systems" (despite everything else, including > the hypervisor, working fine there)? I wasn't aware but I don't care about such old hardware so I'm not going to fix it. If you think this should be fixed, please work with the x86 maintainers to get this fixed. David