From mboxrd@z Thu Jan 1 00:00:00 1970 From: Julien Grall Subject: Re: Design doc of adding ACPI support for arm64 on Xen Date: Wed, 5 Aug 2015 13:48:00 +0100 Message-ID: <55C20600.9070104@citrix.com> References: <55C0C17F.5040208@huawei.com> <55C1D783.3020908@huawei.com> <55C1F840.9060002@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <55C1F840.9060002@linaro.org> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Shannon Zhao , Stefano Stabellini , Shannon Zhao Cc: Hangaohuai , Ian Campbell , "Huangpeng (Peter)" , xen-devel , Stefano Stabellini , Jan Beulich , parth.dixit@linaro.org, Christoffer Dall List-Id: xen-devel@lists.xenproject.org On 05/08/15 12:49, Shannon Zhao wrote: >> That's great! >> Keep in mind that many ARM platforms have non-PCI busses, so I think >> we'll need an amba and a platform bus_notifier too, in addition to the >> existing pci bus notifier. >> > > Thanks for your reminding. I thought about amba. Since ACPI of current > linux kernel doesn't support probe amba bus devices, so this > bus_notifier will not be used at the moment. But there are some voice > that we need to make ACPI support amba on the linux arm kernel mail > list. And to me it doesn't matter to add the amba bus_notifier. This comment raised one question. What happen if the hardware has MMIO region not described in the ACPI? Does the driver would have to call a specific xen function to register the missing I/O? Regards, -- Julien Grall