From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jaeyong Yoo Subject: Re: Very strange behavior between balloon driver and network driver (Arndale) Date: Wed, 29 May 2013 11:22:36 +0000 (GMT) Message-ID: <24373880.290291369826555618.JavaMail.weblogic@epml02> Reply-To: jaeyong.yoo@samsung.com Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: MIME-version: 1.0 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.xen.org" List-Id: xen-devel@lists.xenproject.org > > I expect that the ballooning up and down is counteracting the affect of > the 1:1 workaround which is required on the Arndale due to lack of an > IOMMU driver. > > As a workaround I would recommend using dom0_mem= and > disabling autoballooning. After I applied the above two things, I still see the network error. Autoballooning is still used in privcmd with ioctl IOCTL_PRIVCMD_MMAPBATCH_V2 when mapping foreign range (in order to deliver the domU kernel binary to domU memory). I applied as follows: - put dom0_mem=256M in dom0 kernel booting arg. - create domU with config autoballoon="off" > > Of course if, as a Sumsung developer, you are able to gain access to the > documentation necessary to write an IOMMU driver for the Arndale > platform that would be great! AFAIK Arndale board has sysMMU but it is placed between CPU and GPU for performance purpose. So, I think it is not be able to use it for virtualization. > > Ian. > Jaeyong