From mboxrd@z Thu Jan 1 00:00:00 1970 From: Julien Grall Subject: Re: [PATCH v3 12/13] xen/arm: Add the property "protected-devices" in the hypervisor node Date: Fri, 04 Apr 2014 12:23:05 +0100 Message-ID: <533E9619.7030809@linaro.org> References: <1394552999-14171-1-git-send-email-julien.grall@linaro.org> <1394552999-14171-13-git-send-email-julien.grall@linaro.org> <1395161280.11824.21.camel@kazak.uk.xensource.com> <5328A7E3.3070402@linaro.org> <1395225206.10203.43.camel@kazak.uk.xensource.com> <533DD7C7.8090803@linaro.org> <1396604406.4211.179.camel@kazak.uk.xensource.com> <533E887F.9050106@linaro.org> <1396607282.4211.188.camel@kazak.uk.xensource.com> <533E8BF3.1060305@linaro.org> <1396608481.4211.196.camel@kazak.uk.xensource.com> <533E9109.5030509@linaro.org> <1396610010.4211.204.camel@kazak.uk.xensource.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail6.bemta5.messagelabs.com ([195.245.231.135]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1WW2DE-00080H-GU for xen-devel@lists.xenproject.org; Fri, 04 Apr 2014 11:23:08 +0000 Received: by mail-wg0-f47.google.com with SMTP id x12so3320448wgg.30 for ; Fri, 04 Apr 2014 04:23:07 -0700 (PDT) In-Reply-To: <1396610010.4211.204.camel@kazak.uk.xensource.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: xen-devel@lists.xenproject.org, tim@xen.org, stefano.stabellini@citrix.com List-Id: xen-devel@lists.xenproject.org On 04/04/2014 12:13 PM, Ian Campbell wrote: > We could enable both of those things only at the point where vm_assist > was called. [..] > I think we can reasonably require that vm_assist be called super early, > i.e. before any DMA operations occur, in Linux terms I think > early_initcall(xen_guest_init) is likely early enough, or we could move > xen_guestr_init even sooner. IHMO, this solution is far too complicate and we will have to fork from the current IOMMU framework. > We also have the option of a build time feature flag in the image itself > like on x86. It is likely that going forward we will have other cases > where we wished we had such a thing so getting it in place now would be > useful. I definitely prefer this solution which seems more cleaner than the others. Is it possible to embedded notes in a zImage? How x86 handle other format than ELF? > >> It's not possible in Xen to know if the decide is used or not. > > "the decide"? The device, I mixed multiple sentences together, sorry. -- Julien Grall