From: Aaron Fabbri <aafabbri@cisco.com> To: Alexander Graf <agraf@suse.de>, "Roedel, Joerg" <joerg.roedel@amd.com> Cc: Alexey Kardashevskiy <aik@au1.ibm.com>, "kvm@vger.kernel.org" <kvm@vger.kernel.org>, Paul Mackerras <pmac@au1.ibm.com>, "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>, qemu-devel <qemu-devel@nongnu.org>, chrisw <chrisw@sous-sol.org>, iommu <iommu@lists.linux-foundation.org>, Avi Kivity <avi@redhat.com>, Anthony Liguori <anthony@codemonkey.ws>, linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, "benve@cisco.com" <benve@cisco.com> Subject: Re: kvm PCI assignment & VFIO ramblings Date: Fri, 26 Aug 2011 10:52:54 -0700 [thread overview] Message-ID: <CA7D2B86.FD79%aafabbri@cisco.com> (raw) In-Reply-To: <571DC890-A1A3-4528-92BE-566F033FD4BF@suse.de> On 8/26/11 7:07 AM, "Alexander Graf" <agraf@suse.de> wrote: > <snip> > > Forget the KVM case for a moment and think of a user space device driver. I as > a user am not root. But I as a user when having access to /dev/vfioX want to > be able to access the device and manage it - and only it. The admin of that > box needs to set it up properly for me to be able to access it. > > So having two steps is really the correct way to go: > > * create VFIO group > * use VFIO group > > because the two are done by completely different users. This is not the case for my userspace drivers using VFIO today. Each process will open vfio devices on the fly, and they need to be able to share IOMMU resources. So I need the ability to dynamically bring up devices and assign them to a group. The number of actual devices and how they map to iommu domains is not known ahead of time. We have a single piece of silicon that can expose hundreds of pci devices. In my case, the only administrative task would be to give my processes/users access to the vfio groups (which are initially singletons), and the application actually opens them and needs the ability to merge groups together to conserve IOMMU resources (assuming we're not going to expose uiommu). -Aaron
WARNING: multiple messages have this Message-ID (diff)
From: Aaron Fabbri <aafabbri@cisco.com> To: Alexander Graf <agraf@suse.de>, "Roedel, Joerg" <joerg.roedel@amd.com> Cc: Alexey Kardashevskiy <aik@au1.ibm.com>, "kvm@vger.kernel.org" <kvm@vger.kernel.org>, Paul Mackerras <pmac@au1.ibm.com>, "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>, qemu-devel <qemu-devel@nongnu.org>, chrisw <chrisw@sous-sol.org>, iommu <iommu@lists.linux-foundation.org>, Avi Kivity <avi@redhat.com>, linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, "benve@cisco.com" <benve@cisco.com> Subject: Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings Date: Fri, 26 Aug 2011 10:52:54 -0700 [thread overview] Message-ID: <CA7D2B86.FD79%aafabbri@cisco.com> (raw) In-Reply-To: <571DC890-A1A3-4528-92BE-566F033FD4BF@suse.de> On 8/26/11 7:07 AM, "Alexander Graf" <agraf@suse.de> wrote: > <snip> > > Forget the KVM case for a moment and think of a user space device driver. I as > a user am not root. But I as a user when having access to /dev/vfioX want to > be able to access the device and manage it - and only it. The admin of that > box needs to set it up properly for me to be able to access it. > > So having two steps is really the correct way to go: > > * create VFIO group > * use VFIO group > > because the two are done by completely different users. This is not the case for my userspace drivers using VFIO today. Each process will open vfio devices on the fly, and they need to be able to share IOMMU resources. So I need the ability to dynamically bring up devices and assign them to a group. The number of actual devices and how they map to iommu domains is not known ahead of time. We have a single piece of silicon that can expose hundreds of pci devices. In my case, the only administrative task would be to give my processes/users access to the vfio groups (which are initially singletons), and the application actually opens them and needs the ability to merge groups together to conserve IOMMU resources (assuming we're not going to expose uiommu). -Aaron
next prev parent reply other threads:[~2011-08-26 17:52 UTC|newest] Thread overview: 322+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-07-29 23:58 kvm PCI assignment & VFIO ramblings Benjamin Herrenschmidt 2011-07-29 23:58 ` Benjamin Herrenschmidt 2011-07-30 18:20 ` Alex Williamson 2011-07-30 18:20 ` [Qemu-devel] " Alex Williamson 2011-07-30 18:20 ` Alex Williamson 2011-07-30 23:54 ` Benjamin Herrenschmidt 2011-07-30 23:54 ` [Qemu-devel] " Benjamin Herrenschmidt 2011-07-30 23:54 ` Benjamin Herrenschmidt 2011-08-01 18:59 ` Alex Williamson 2011-08-01 18:59 ` [Qemu-devel] " Alex Williamson 2011-08-01 18:59 ` Alex Williamson 2011-08-02 2:00 ` Benjamin Herrenschmidt 2011-08-02 2:00 ` [Qemu-devel] " Benjamin Herrenschmidt 2011-08-02 2:00 ` Benjamin Herrenschmidt 2011-07-30 23:55 ` Benjamin Herrenschmidt 2011-07-30 23:55 ` [Qemu-devel] " Benjamin Herrenschmidt 2011-07-30 23:55 ` Benjamin Herrenschmidt 2011-08-02 8:28 ` David Gibson 2011-08-02 8:28 ` [Qemu-devel] " David Gibson 2011-08-02 8:28 ` David Gibson 2011-08-02 18:14 ` Alex Williamson 2011-08-02 18:14 ` [Qemu-devel] " Alex Williamson 2011-08-02 18:14 ` Alex Williamson 2011-08-02 18:35 ` Alex Williamson 2011-08-02 18:35 ` [Qemu-devel] " Alex Williamson 2011-08-02 18:35 ` Alex Williamson 2011-08-03 2:04 ` David Gibson 2011-08-03 2:04 ` [Qemu-devel] " David Gibson 2011-08-03 2:04 ` David Gibson 2011-08-03 3:44 ` Alex Williamson 2011-08-03 3:44 ` [Qemu-devel] " Alex Williamson 2011-08-03 3:44 ` Alex Williamson 2011-08-04 0:39 ` David Gibson 2011-08-04 0:39 ` [Qemu-devel] " David Gibson 2011-08-08 8:28 ` Avi Kivity 2011-08-08 8:28 ` [Qemu-devel] " Avi Kivity 2011-08-08 8:28 ` Avi Kivity 2011-08-09 23:24 ` Alex Williamson 2011-08-09 23:24 ` [Qemu-devel] " Alex Williamson 2011-08-09 23:24 ` Alex Williamson 2011-08-10 2:48 ` Benjamin Herrenschmidt 2011-08-10 2:48 ` [Qemu-devel] " Benjamin Herrenschmidt 2011-08-10 2:48 ` Benjamin Herrenschmidt 2011-08-20 16:51 ` Alex Williamson 2011-08-20 16:51 ` [Qemu-devel] " Alex Williamson 2011-08-20 16:51 ` Alex Williamson 2011-08-22 5:55 ` David Gibson 2011-08-22 5:55 ` [Qemu-devel] " David Gibson 2011-08-22 5:55 ` David Gibson 2011-08-22 15:45 ` Alex Williamson 2011-08-22 15:45 ` [Qemu-devel] " Alex Williamson 2011-08-22 21:01 ` Benjamin Herrenschmidt 2011-08-22 21:01 ` [Qemu-devel] " Benjamin Herrenschmidt 2011-08-22 21:01 ` Benjamin Herrenschmidt 2011-08-23 19:30 ` Alex Williamson 2011-08-23 19:30 ` [Qemu-devel] " Alex Williamson 2011-08-23 19:30 ` Alex Williamson 2011-08-23 23:51 ` Benjamin Herrenschmidt 2011-08-23 23:51 ` [Qemu-devel] " Benjamin Herrenschmidt 2011-08-23 23:51 ` Benjamin Herrenschmidt 2011-08-24 3:40 ` Alexander Graf 2011-08-24 3:40 ` [Qemu-devel] " Alexander Graf 2011-08-24 3:40 ` Alexander Graf 2011-08-24 14:47 ` Alex Williamson 2011-08-24 14:47 ` [Qemu-devel] " Alex Williamson 2011-08-24 14:47 ` Alex Williamson 2011-08-24 8:43 ` Joerg Roedel 2011-08-24 8:43 ` [Qemu-devel] " Joerg Roedel 2011-08-24 8:43 ` Joerg Roedel 2011-08-24 14:56 ` Alex Williamson 2011-08-24 14:56 ` [Qemu-devel] " Alex Williamson 2011-08-24 14:56 ` Alex Williamson 2011-08-25 11:01 ` Roedel, Joerg 2011-08-25 11:01 ` [Qemu-devel] " Roedel, Joerg 2011-08-25 11:01 ` Roedel, Joerg 2011-08-23 2:38 ` David Gibson 2011-08-23 2:38 ` [Qemu-devel] " David Gibson 2011-08-23 2:38 ` David Gibson 2011-08-23 16:23 ` Alex Williamson 2011-08-23 16:23 ` [Qemu-devel] " Alex Williamson 2011-08-23 16:23 ` Alex Williamson 2011-08-23 23:41 ` Benjamin Herrenschmidt 2011-08-23 23:41 ` [Qemu-devel] " Benjamin Herrenschmidt 2011-08-23 23:41 ` Benjamin Herrenschmidt 2011-08-24 3:36 ` Alexander Graf 2011-08-24 3:36 ` [Qemu-devel] " Alexander Graf 2011-08-24 3:36 ` Alexander Graf 2011-08-22 6:30 ` Avi Kivity 2011-08-22 6:30 ` [Qemu-devel] " Avi Kivity 2011-08-22 6:30 ` Avi Kivity 2011-08-22 10:46 ` Joerg Roedel 2011-08-22 10:46 ` [Qemu-devel] " Joerg Roedel 2011-08-22 10:46 ` Joerg Roedel 2011-08-22 10:51 ` Avi Kivity 2011-08-22 10:51 ` [Qemu-devel] " Avi Kivity 2011-08-22 10:51 ` Avi Kivity 2011-08-22 12:36 ` Roedel, Joerg 2011-08-22 12:36 ` [Qemu-devel] " Roedel, Joerg 2011-08-22 12:36 ` Roedel, Joerg 2011-08-22 12:42 ` Avi Kivity 2011-08-22 12:42 ` [Qemu-devel] " Avi Kivity 2011-08-22 12:42 ` Avi Kivity 2011-08-22 12:55 ` Roedel, Joerg 2011-08-22 12:55 ` [Qemu-devel] " Roedel, Joerg 2011-08-22 12:55 ` Roedel, Joerg 2011-08-22 13:06 ` Avi Kivity 2011-08-22 13:06 ` [Qemu-devel] " Avi Kivity 2011-08-22 13:06 ` Avi Kivity 2011-08-22 13:15 ` Roedel, Joerg 2011-08-22 13:15 ` [Qemu-devel] " Roedel, Joerg 2011-08-22 13:15 ` Roedel, Joerg 2011-08-22 13:17 ` Avi Kivity 2011-08-22 13:17 ` [Qemu-devel] " Avi Kivity 2011-08-22 13:17 ` Avi Kivity 2011-08-22 14:37 ` Roedel, Joerg 2011-08-22 14:37 ` [Qemu-devel] " Roedel, Joerg 2011-08-22 14:37 ` Roedel, Joerg 2011-08-22 20:53 ` Benjamin Herrenschmidt 2011-08-22 20:53 ` [Qemu-devel] " Benjamin Herrenschmidt 2011-08-22 20:53 ` Benjamin Herrenschmidt 2011-08-22 17:25 ` Joerg Roedel 2011-08-22 17:25 ` [Qemu-devel] " Joerg Roedel 2011-08-22 17:25 ` Joerg Roedel 2011-08-22 19:17 ` Alex Williamson 2011-08-22 19:17 ` [Qemu-devel] " Alex Williamson 2011-08-22 19:17 ` Alex Williamson 2011-08-23 13:14 ` Roedel, Joerg 2011-08-23 13:14 ` [Qemu-devel] " Roedel, Joerg 2011-08-23 13:14 ` Roedel, Joerg 2011-08-23 17:08 ` Alex Williamson 2011-08-23 17:08 ` [Qemu-devel] " Alex Williamson 2011-08-23 17:08 ` Alex Williamson 2011-08-24 8:52 ` Roedel, Joerg 2011-08-24 8:52 ` [Qemu-devel] " Roedel, Joerg 2011-08-24 8:52 ` Roedel, Joerg 2011-08-24 15:07 ` Alex Williamson 2011-08-24 15:07 ` [Qemu-devel] " Alex Williamson 2011-08-24 15:07 ` Alex Williamson 2011-08-25 12:31 ` Roedel, Joerg 2011-08-25 12:31 ` [Qemu-devel] " Roedel, Joerg 2011-08-25 12:31 ` Roedel, Joerg 2011-08-25 13:25 ` Alexander Graf 2011-08-25 13:25 ` [Qemu-devel] " Alexander Graf 2011-08-25 13:25 ` Alexander Graf 2011-08-26 4:24 ` David Gibson 2011-08-26 4:24 ` [Qemu-devel] " David Gibson 2011-08-26 4:24 ` David Gibson 2011-08-26 9:24 ` Roedel, Joerg 2011-08-26 9:24 ` [Qemu-devel] " Roedel, Joerg 2011-08-26 9:24 ` Roedel, Joerg 2011-08-28 13:14 ` Avi Kivity 2011-08-28 13:14 ` [Qemu-devel] " Avi Kivity 2011-08-28 13:14 ` Avi Kivity 2011-08-28 13:56 ` Joerg Roedel 2011-08-28 13:56 ` [Qemu-devel] " Joerg Roedel 2011-08-28 13:56 ` Joerg Roedel 2011-08-28 14:04 ` Avi Kivity 2011-08-28 14:04 ` [Qemu-devel] " Avi Kivity 2011-08-28 14:04 ` Avi Kivity 2011-08-30 16:14 ` Joerg Roedel 2011-08-30 16:14 ` [Qemu-devel] " Joerg Roedel 2011-08-30 16:14 ` Joerg Roedel 2011-08-22 21:03 ` Benjamin Herrenschmidt 2011-08-22 21:03 ` [Qemu-devel] " Benjamin Herrenschmidt 2011-08-22 21:03 ` Benjamin Herrenschmidt 2011-08-23 13:18 ` Roedel, Joerg 2011-08-23 13:18 ` [Qemu-devel] " Roedel, Joerg 2011-08-23 13:18 ` Roedel, Joerg 2011-08-23 23:35 ` Benjamin Herrenschmidt 2011-08-23 23:35 ` [Qemu-devel] " Benjamin Herrenschmidt 2011-08-23 23:35 ` Benjamin Herrenschmidt 2011-08-24 8:53 ` Roedel, Joerg 2011-08-24 8:53 ` [Qemu-devel] " Roedel, Joerg 2011-08-24 8:53 ` Roedel, Joerg 2011-08-22 20:29 ` aafabbri 2011-08-22 20:29 ` [Qemu-devel] " aafabbri 2011-08-22 20:29 ` aafabbri 2011-08-22 20:49 ` Benjamin Herrenschmidt 2011-08-22 20:49 ` [Qemu-devel] " Benjamin Herrenschmidt 2011-08-22 21:38 ` aafabbri 2011-08-22 21:38 ` [Qemu-devel] " aafabbri 2011-08-22 21:38 ` aafabbri 2011-08-22 21:49 ` Benjamin Herrenschmidt 2011-08-22 21:49 ` [Qemu-devel] " Benjamin Herrenschmidt 2011-08-22 21:49 ` Benjamin Herrenschmidt 2011-08-23 0:52 ` aafabbri 2011-08-23 0:52 ` [Qemu-devel] " aafabbri 2011-08-23 0:52 ` aafabbri 2011-08-23 6:54 ` Benjamin Herrenschmidt 2011-08-23 6:54 ` [Qemu-devel] " Benjamin Herrenschmidt 2011-08-23 6:54 ` Benjamin Herrenschmidt 2011-08-23 11:09 ` Joerg Roedel 2011-08-23 11:09 ` [Qemu-devel] " Joerg Roedel 2011-08-23 11:09 ` Joerg Roedel 2011-08-23 17:01 ` Alex Williamson 2011-08-23 17:01 ` [Qemu-devel] " Alex Williamson 2011-08-23 17:01 ` Alex Williamson 2011-08-23 17:33 ` Aaron Fabbri 2011-08-23 17:33 ` [Qemu-devel] " Aaron Fabbri 2011-08-23 17:33 ` Aaron Fabbri 2011-08-23 18:01 ` Alex Williamson 2011-08-23 18:01 ` [Qemu-devel] " Alex Williamson 2011-08-23 18:01 ` Alex Williamson 2011-08-24 9:10 ` Joerg Roedel 2011-08-24 9:10 ` [Qemu-devel] " Joerg Roedel 2011-08-24 9:10 ` Joerg Roedel 2011-08-24 21:13 ` Alex Williamson 2011-08-24 21:13 ` [Qemu-devel] " Alex Williamson 2011-08-24 21:13 ` Alex Williamson 2011-08-25 10:54 ` Roedel, Joerg 2011-08-25 10:54 ` [Qemu-devel] " Roedel, Joerg 2011-08-25 10:54 ` Roedel, Joerg 2011-08-25 15:38 ` Don Dutile 2011-08-25 15:38 ` [Qemu-devel] " Don Dutile 2011-08-25 15:38 ` Don Dutile 2011-08-25 16:46 ` Roedel, Joerg 2011-08-25 16:46 ` [Qemu-devel] " Roedel, Joerg 2011-08-25 16:46 ` Roedel, Joerg 2011-08-25 17:20 ` Alex Williamson 2011-08-25 17:20 ` [Qemu-devel] " Alex Williamson 2011-08-25 17:20 ` Alex Williamson 2011-08-25 18:05 ` Joerg Roedel 2011-08-25 18:05 ` [Qemu-devel] " Joerg Roedel 2011-08-25 18:05 ` Joerg Roedel 2011-08-26 18:04 ` Alex Williamson 2011-08-26 18:04 ` [Qemu-devel] " Alex Williamson 2011-08-26 18:04 ` Alex Williamson 2011-08-30 16:13 ` Joerg Roedel 2011-08-30 16:13 ` [Qemu-devel] " Joerg Roedel 2011-08-30 16:13 ` Joerg Roedel 2011-08-23 11:04 ` Joerg Roedel 2011-08-23 11:04 ` [Qemu-devel] " Joerg Roedel 2011-08-23 11:04 ` Joerg Roedel 2011-08-23 16:54 ` aafabbri 2011-08-23 16:54 ` [Qemu-devel] " aafabbri 2011-08-23 16:54 ` aafabbri 2011-08-24 9:14 ` Roedel, Joerg 2011-08-24 9:14 ` [Qemu-devel] " Roedel, Joerg 2011-08-24 9:14 ` Roedel, Joerg 2011-08-24 9:33 ` David Gibson 2011-08-24 9:33 ` [Qemu-devel] " David Gibson 2011-08-24 9:33 ` David Gibson 2011-08-24 11:03 ` Roedel, Joerg 2011-08-24 11:03 ` [Qemu-devel] " Roedel, Joerg 2011-08-24 11:03 ` Roedel, Joerg 2011-08-26 4:20 ` David Gibson 2011-08-26 4:20 ` [Qemu-devel] " David Gibson 2011-08-26 4:20 ` David Gibson 2011-08-26 9:33 ` Roedel, Joerg 2011-08-26 9:33 ` [Qemu-devel] " Roedel, Joerg 2011-08-26 9:33 ` Roedel, Joerg 2011-08-26 14:07 ` Alexander Graf 2011-08-26 14:07 ` [Qemu-devel] " Alexander Graf 2011-08-26 14:07 ` Alexander Graf 2011-08-26 15:24 ` Joerg Roedel 2011-08-26 15:24 ` [Qemu-devel] " Joerg Roedel 2011-08-26 15:24 ` Joerg Roedel 2011-08-26 15:29 ` Alexander Graf 2011-08-26 15:29 ` [Qemu-devel] " Alexander Graf 2011-08-26 15:29 ` Alexander Graf 2011-08-26 17:52 ` Aaron Fabbri [this message] 2011-08-26 17:52 ` [Qemu-devel] " Aaron Fabbri 2011-08-26 19:35 ` Chris Wright 2011-08-26 19:35 ` [Qemu-devel] " Chris Wright 2011-08-26 19:35 ` Chris Wright 2011-08-26 20:17 ` Aaron Fabbri 2011-08-26 20:17 ` [Qemu-devel] " Aaron Fabbri 2011-08-26 20:17 ` Aaron Fabbri 2011-08-26 21:06 ` Chris Wright 2011-08-26 21:06 ` [Qemu-devel] " Chris Wright 2011-08-26 21:06 ` Chris Wright 2011-08-30 1:29 ` David Gibson 2011-08-30 1:29 ` [Qemu-devel] " David Gibson 2011-08-30 1:29 ` David Gibson 2011-08-04 10:35 ` Joerg Roedel 2011-08-04 10:35 ` [Qemu-devel] " Joerg Roedel 2011-08-04 10:35 ` Joerg Roedel 2011-07-30 22:21 ` Benjamin Herrenschmidt 2011-07-30 22:21 ` Benjamin Herrenschmidt 2011-08-01 16:40 ` Alex Williamson 2011-08-01 16:40 ` Alex Williamson 2011-08-02 1:29 ` Benjamin Herrenschmidt 2011-07-31 14:09 ` Avi Kivity 2011-07-31 14:09 ` Avi Kivity 2011-08-01 20:27 ` Alex Williamson 2011-08-01 20:27 ` Alex Williamson 2011-08-02 8:32 ` Avi Kivity 2011-08-02 8:32 ` Avi Kivity 2011-08-04 10:41 ` Joerg Roedel 2011-08-04 10:41 ` Joerg Roedel 2011-08-05 10:26 ` Benjamin Herrenschmidt 2011-08-05 10:26 ` Benjamin Herrenschmidt 2011-08-05 12:57 ` Joerg Roedel 2011-08-05 12:57 ` Joerg Roedel 2011-08-02 1:27 ` Benjamin Herrenschmidt 2011-08-02 1:27 ` Benjamin Herrenschmidt 2011-08-02 9:12 ` Avi Kivity 2011-08-02 9:12 ` Avi Kivity 2011-08-02 12:58 ` Benjamin Herrenschmidt 2011-08-02 12:58 ` Benjamin Herrenschmidt 2011-08-02 13:39 ` Avi Kivity 2011-08-02 13:39 ` Avi Kivity 2011-08-02 15:34 ` Alex Williamson 2011-08-02 15:34 ` Alex Williamson 2011-08-02 21:29 ` Konrad Rzeszutek Wilk 2011-08-02 21:29 ` Konrad Rzeszutek Wilk 2011-08-03 1:02 ` Alex Williamson 2011-08-03 1:02 ` Alex Williamson 2011-08-02 14:39 ` Alex Williamson 2011-08-02 14:39 ` Alex Williamson 2011-08-01 2:48 ` David Gibson 2011-08-04 10:27 ` Joerg Roedel 2011-08-04 10:27 ` Joerg Roedel 2011-08-05 10:42 ` Benjamin Herrenschmidt 2011-08-05 10:42 ` Benjamin Herrenschmidt 2011-08-05 13:44 ` Joerg Roedel 2011-08-05 13:44 ` Joerg Roedel 2011-08-05 22:49 ` Benjamin Herrenschmidt 2011-08-05 22:49 ` Benjamin Herrenschmidt 2011-08-05 15:10 ` Alex Williamson 2011-08-05 15:10 ` Alex Williamson 2011-08-08 6:07 ` David Gibson
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