[Kimchi-devel] [PATCH v7 0/4] Host device passthrough: Summary

[Zhou Zheng Sheng]

on 2014/07/13 22:58, Aline Manera wrote:
> Just remembered to mention:
> 
> Add new files to pep_whitlist in Makefile.am and make sure they follow
> the pep8 rules
> 

Yes. Thanks.

> On 07/13/2014 11:51 AM, Aline Manera wrote:
>>
>>
>> On 07/09/2014 04:01 AM, 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.
>>>
>>
>> Don't forget to also update mockmodel.py to reflect those changes.
>>
>>> 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             |  16 ++
>>>   src/kimchi/control/vm/hostdevs.py      |  44 +++++
>>>   src/kimchi/featuretests.py             |  10 +-
>>>   src/kimchi/hostdev.py                  | 311
>>> +++++++++++++++++++++++++++++++
>>>   src/kimchi/i18n.py                     |   9 +
>>>   src/kimchi/mockmodel.py                |   7 +-
>>>   src/kimchi/model/config.py             |   2 +
>>>   src/kimchi/model/host.py               |  32 ++--
>>>   src/kimchi/model/libvirtstoragepool.py |  18 +-
>>>   src/kimchi/model/vmhostdevs.py         | 323
>>> +++++++++++++++++++++++++++++++++
>>>   src/kimchi/rollbackcontext.py          |   3 +
>>>   src/kimchi/xmlutils.py                 |  26 ++-
>>>   tests/test_rest.py                     |   6 +-
>>>   tests/test_storagepool.py              |   7 +-
>>>   15 files changed, 786 insertions(+), 39 deletions(-)
>>>   create mode 100644 src/kimchi/control/vm/hostdevs.py
>>>   create mode 100644 src/kimchi/hostdev.py
>>>   create mode 100644 src/kimchi/model/vmhostdevs.py
>>>
>>
>> _______________________________________________
>> Kimchi-devel mailing list
>> Kimchi-devel at ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/kimchi-devel
>>


-- 
Zhou Zheng Sheng / 周征晟
E-mail: zhshzhou at linux.vnet.ibm.com
Telephone: 86-10-82454397