Re: [Kimchi-devel] [PATCH v8 0/4] Host device passthrough: Summary

My redhat is setup by IT department, I believe it is widely used. So team, please discuss and figure out a distribution independent way to handle this feature.

On 7/28/2014 5:38 PM, Zhou Zheng Sheng wrote: > Hi, > > Yu Xin and me tested the patches on a PC with RHEL6.4 installed. We > turned on vt-d in BIOS, enabled intel_iommu=on in kernel command line. > > After setting this, I verified the IOMMU is enabled. > dmesg | grep -e DMAR -e IOMMU | grep -e "DRHD base" -e "enabled" > > Unfortunately qemu failed to assign PCI devices. The Qemu log was vague. > I googled and tried some solutions but none worked. It might be the > problem of the machine itself or the maturity of this feature in kernel > 2.6 and qemu-kvm 0.12. > > I also find the libvirt version on RHEL6 is a bit old, it does not > provide the necessary device information, so we have to write extra code > to fetch it. Moreover, the iommu group sysfs is added in Kenel 3.5, so > RHEL6 does not have it. > > It seems we need more time and work to support RHEL6, so I suggest that, > for the first release of this feature, we support the latest Fedora, > then in next releases we improve the support for RHEL6. > > on 2014/07/28 11:01, Zhou Zheng Sheng wrote: >> Hi, >> >> I rebased the patches and send you the drafts for you to test and >> develop. I'll add doc and unit tests, then send a formal v9 patch to >> list today. >> >> on 2014/07/25 16:39, Yu Xin Huo wrote: >>> Apply failed. >>> >>> >>> On 7/21/2014 5:36 PM, Zhou Zheng Sheng wrote: >>>> Hi, >>>> >>>> This patch series is to enable Kimchi to assign hos devices >>>> directly to >>>> a VM, thus greately improve VM performance. Currently we support >>>> assigning >>>> PCI device, USB device and SCSI LUN. For example, we can assign an NIC >>>> to VM to improve guest network throughput, or passthrough a USB camera >>>> to enable the guest OS to record video. >>>> >>>> Host devices form a tree. We can assign most of the devices in the >>>> tree >>>> to VM. By assigning a device, all the devices in its sub-tree are also >>>> assigned. It might not make sense to assign a USB controller, because >>>> the host may be using one of the devices connected to the controller. >>>> Instead, Kimchi just presents the "leaf" devices to assign to guest. >>>> >>>> In recent Linux kernel and KVM, it is able to recognize the IOMMU >>>> group >>>> of a PCI device. The "leaf" PCI devices in the same IOMMU group should >>>> be assigned and dismissed together. The IOMMU group is the actual >>>> smallest isolation granularity of the PCI devices. >>>> >>>> The first patch is to list all host devices information. It's >>>> useful on >>>> its own to show host devices information. >>>> >>>> The second patch is to list all eligible host devices to assign, as >>>> well >>>> as the "affected" devices in the same IOMMU group. >>>> >>>> The third patch creates a sub-collection "hostdevs" to the VM >>>> resource, >>>> and deals with assigning and dismissing devices. >>>> >>>> The fourth patch adds a sub-collection "vm_holders" to the host device >>>> resource. It's to list all VMs that are holding the device. >>>> >>>> I'll update API and unit test once everyone is happy with the >>>> interface >>>> and logic. >>>> >>>> v8: >>>> Change the URI for listing affected passthrough devices, >>>> suggested by >>>> Aline. Move hostdev.py to src/kimchi/model.py. Still discussing >>>> API >>>> with the front-end developer. Once the API accepted, The author >>>> should >>>> add tests for model and mockmodel, and change API.md and API.json >>>> accordingly. >>>> v7: >>>> Some minor coding style improvements. >>>> v6: >>>> Do not passthrough PCI device of class code 0x07. It might >>>> contains >>>> system device not suitable to assign to guest. >>>> v5: >>>> Filter ealigible pci devices according to pci class. When >>>> assigning a >>>> device to VM, check if there are other VMs holding it. Use >>>> "kimchi.model.utils.get_vm_config_flag()" to correctly set the device >>>> attaching API flag. >>>> v4: >>>> Add new sub-collection to host device to list the VMs holding >>>> the device. >>>> v3: >>>> Fix a small naming error introduced by rebase. >>>> v2: >>>> Handle the devices in VM's sub-collection "hostdevs". >>>> v1: >>>> Handle the devices in VM template. >>>> >>>> Zhou Zheng Sheng (4): >>>> Host device passthrough: List all types of host devices >>>> Host device passthrough: List eligible device to passthrough >>>> Host device passthrough: Directly assign and dissmis host >>>> device from >>>> VM >>>> Host device passthrough: List VMs that are holding a host device >>>> >>>> docs/API.md | 11 +- >>>> src/kimchi/control/host.py | 7 + >>>> src/kimchi/control/vm/hostdevs.py | 44 +++++ >>>> src/kimchi/featuretests.py | 10 +- >>>> src/kimchi/i18n.py | 10 + >>>> src/kimchi/mockmodel.py | 7 +- >>>> src/kimchi/model/config.py | 2 + >>>> src/kimchi/model/host.py | 38 ++-- >>>> src/kimchi/model/hostdev.py | 311 >>>> +++++++++++++++++++++++++++++++ >>>> src/kimchi/model/libvirtstoragepool.py | 18 +- >>>> src/kimchi/model/vmhostdevs.py | 324 >>>> +++++++++++++++++++++++++++++++++ >>>> src/kimchi/rollbackcontext.py | 3 + >>>> src/kimchi/xmlutils.py | 26 ++- >>>> tests/test_rest.py | 6 +- >>>> tests/test_storagepool.py | 7 +- >>>> 15 files changed, 784 insertions(+), 40 deletions(-) >>>> create mode 100644 src/kimchi/control/vm/hostdevs.py >>>> create mode 100644 src/kimchi/model/hostdev.py >>>> create mode 100644 src/kimchi/model/vmhostdevs.py >>>> >>> >>> >>> _______________________________________________ >>> Kimchi-devel mailing list >>> Kimchi-devel(a)ovirt.org >>> http://lists.ovirt.org/mailman/listinfo/kimchi-devel >>> >> >