From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tim Deegan Subject: Re: [PATCH 09/10] xen: arm: weaken SMP barriers to inner shareable. Date: Thu, 4 Jul 2013 12:35:37 +0100 Message-ID: <20130704113537.GK40611@ocelot.phlegethon.org> References: <1372435809.8976.169.camel@zakaz.uk.xensource.com> <1372435856-14040-9-git-send-email-ian.campbell@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <1372435856-14040-9-git-send-email-ian.campbell@citrix.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: Ian Campbell Cc: julien.grall@citrix.com, stefano.stabellini@eu.citrix.com, xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org At 17:10 +0100 on 28 Jun (1372439455), Ian Campbell wrote: > Since all processors are in the inner-shareable domain and we map everything > that way this is sufficient. > > The non-SMP barriers remain full system. Although in principal they could s/principal/principle/. > become outer shareable barriers for some hardware this would require us to > know which class a given device is. Given the small number of device drivers > in Xen itself its probably not worth worrying over, although maybe someone > will benchmark at some point. > > Signed-off-by: Ian Campbell Acked-by: Tim Deegan