From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vlad Zolotarov Subject: Re: Having troubles binding an SR-IOV VF to uio_pci_generic on Amazon instance Date: Wed, 30 Sep 2015 21:15:56 +0300 Message-ID: <560C26DC.80209@cloudius-systems.com> References: <20150930004714-mutt-send-email-mst@redhat.com> <560BBB62.3050502@cloudius-systems.com> <20150930134533-mutt-send-email-mst@redhat.com> <560BC6C9.4020505@cloudius-systems.com> <20150930143927-mutt-send-email-mst@redhat.com> <560BCD2F.5060505@cloudius-systems.com> <20150930150115-mutt-send-email-mst@redhat.com> <560BD284.7040505@cloudius-systems.com> <20150930151632-mutt-send-email-mst@redhat.com> <560BDA81.6070807@cloudius-systems.com> <20150930182155-mutt-send-email-mst@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Cc: "dev@dpdk.org" To: "Michael S. Tsirkin" Return-path: Received: from mail-wi0-f176.google.com (mail-wi0-f176.google.com [209.85.212.176]) by dpdk.org (Postfix) with ESMTP id C14F18D90 for ; Wed, 30 Sep 2015 20:15:58 +0200 (CEST) Received: by wicfx3 with SMTP id fx3so74215208wic.0 for ; Wed, 30 Sep 2015 11:15:58 -0700 (PDT) In-Reply-To: <20150930182155-mutt-send-email-mst@redhat.com> List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 09/30/15 18:26, Michael S. Tsirkin wrote: > On Wed, Sep 30, 2015 at 03:50:09PM +0300, Vlad Zolotarov wrote: >> How not virtualizing iommu forces "all or nothing" approach? > Looks like you can't limit an assigned device to only access part of > guest memory that belongs to a given process. Either let it access all > of guest memory ("all") or don't assign the device ("nothing"). Ok. A question then: can u limit the assigned device to only access part of the guest memory even if iommu was virtualized? How would iommu virtualization change anything? And why do we care about an assigned device to be able to access all Guest memory? >