Re: [Kimchi-devel] [PATCH v12 4/6] Host device passthrough: List VMs that are holding a host device

Add a "vm_holders" sub-collection under host device resource, so the front-end can determine if a device is busy or not, and the user can know which VMs are holding the device. This patch scans all VM XML to check if a device is hold by a VM. Example curl -k -u root -H "Content-Type: application/json" \ -H "Accept: application/json" \ 'https://127.0.0.1:8001/host/devices/usb_1_1_6/vm_holders' Should output a list like following. [ { "state":"shutoff", "name":"fedora20" }, { "state":"running", "name":"f20xfce-slave" } ] If there is no VM holding the device, it prints an empty list []. v5: When assigning a device to VM, check if there are other VMs holding the device and raise an exception. Move the VMHoldersModel to vmhostdevs.py to avoid circular import problem. v11: Allow Guests to Share a Host PCI Device. A PCI device can be shared by guests, as long as there is only one guest active. Signed-off-by: Zhou Zheng Sheng <zhshzhou(a)linux.vnet.ibm.com&gt; --- src/kimchi/control/host.py | 7 +++++++ src/kimchi/model/vmhostdevs.py | 19 +++++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/src/kimchi/control/host.py b/src/kimchi/control/host.py index 1eb6350..7bcae72 100644 --- a/src/kimchi/control/host.py +++ b/src/kimchi/control/host.py @@ -113,11 +113,18 @@ class Devices(Collection): self.resource = Device +class VMHolders(SimpleCollection): + def __init__(self, model, device_id): + super(VMHolders, self).__init__(model) + self.model_args = (device_id, ) + + class Device(Resource): def __init__(self, model, id): self.role_key = 'storage' self.admin_methods = ['GET'] super(Device, self).__init__(model, id) + self.vm_holders = VMHolders(self.model, id) @property def data(self): diff --git a/src/kimchi/model/vmhostdevs.py b/src/kimchi/model/vmhostdevs.py index d9e7a05..1098f88 100644 --- a/src/kimchi/model/vmhostdevs.py +++ b/src/kimchi/model/vmhostdevs.py @@ -293,3 +293,22 @@ class VMHostDevModel(object): xmlstr = etree.tostring(e) dom.detachDeviceFlags( xmlstr, get_vm_config_flag(dom, mode='all')) + + +class VMHoldersModel(object): + def __init__(self, **kargs): + self.conn = kargs['conn'] + + def get_list(self, device_id): + devsmodel = VMHostDevsModel(conn=self.conn) + + conn = self.conn.get() + doms = conn.listAllDomains(0) + + res = [] + for dom in doms: + dom_name = dom.name() + if device_id in devsmodel.get_list(dom_name): + state = DOM_STATE_MAP[dom.info()[0]] + res.append({"name": dom_name, "state": state}) + return res