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dom0/qvm-usb: partly implement usb_find_unused_frontend()

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This commit is contained in:
Alexandre Bezroutchko 2012-10-12 21:28:22 +02:00
parent a719c5a44f
commit a85d34a8b3
1 changed files with 45 additions and 18 deletions
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63
dom0/qvm-core/qubesutils.py
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@ -406,18 +406,20 @@ def block_detach_all(vm, vm_xid = None):
####### USB devices ######
def usb_setup(backend, frontend, devid):
def usb_setup(backend_vm_xid, vm_xid, devid):
"""
Attach frontend to the backend.
FIXME
backend_vm_xid - id of the backend domain
vm_xid - id of the frontend domain
devid - id of the pvusb controller
"""
trans = xs.transaction_start()
be_path = "/local/domain/%d/backend/%s/%d/%d" % (backend, dev_name, frontend, devid)
fe_path = "/local/domain/%d/device/%s/%d" % (frontend, dev_name, devid)
be_path = "/local/domain/%d/backend/vsub/%d/%d" % (backend_vm_xid, vm_xid, devid)
fe_path = "/local/domain/%d/device/vusb/%d" % (vm_xid, devid)
be_perm = [{'dom': backend}, {'dom': frontend, 'read': True} ]
fe_perm = [{'dom': frontend}, {'dom': backend, 'read': True} ]
be_perm = [{'dom': backend_vm_xid}, {'dom': vm_xid, 'read': True} ]
fe_perm = [{'dom': vm_xid}, {'dom': backend_vm_xid, 'read': True} ]
# Create directories and set permissions
xs.write(trans, be_path, "")
@ -426,12 +428,12 @@ def usb_setup(backend, frontend, devid):
xs.write(trans, fe_path, "")
xs.set_permissions(trans, fe_path, fe_perm)
# Write backend information into the location that frontend look for.
xs.write(trans, "%s/backend-id" % fe_path, str(backend))
# Write backend information into the location that frontend looks for
xs.write(trans, "%s/backend-id" % fe_path, str(backend_vm_xid))
xs.write(trans, "%s/backend" % fe_path, be_path)
# Write frontend information into the location that backend look for.
xs.write(trans, "%s/frontend-id" % be_path, str(frontend))
# Write frontend information into the location that backend looks for
xs.write(trans, "%s/frontend-id" % be_path, str(vm_xid))
xs.write(trans, "%s/frontend" % be_path, fe_path)
# Write USB Spec version field.
@ -548,19 +550,44 @@ def usb_check_frontend_busy(vm, front_dev, port):
# return xs.read('', '/local/domain/%d/device/vusb/%d/state' % (vm.xid, frontend)) == '4'
return False
def usb_find_unused_frontend(vm):
front_dev = 0
port = 1
# FIXME: raise QubesException("No unused frontend found")
return '%d-%d' % (front_dev, port)
def usb_find_unused_frontend(backend_vm_xid, vm_xid):
"""
Find an unused frontend/port to link the given backend with the given frontend.
Create new frontend if needed.
"""
xs_trans='' # FIXME
last_frontend_dev = -1
frontend_devs = xs.ls(xs_trans, "/local/domain/%d/device/vusb" % vm_xid)
if frontend_devs is not None:
for frontend_dev in frontend_devs:
if not frontend_dev.isdigit():
print >> sys.stderr, "Invalid frontend_dev in VM %d" % vm_xid
continue
frontend_dev = int(frontend_dev)
fe_path = "/local/domain/%d/device/vusb/%d" % (vm_xid, frontend_dev)
if xs.read(xs_trans, "%s/backend-id" % fe_path) == str(backend_vm_xid):
ports = xs.ls(xs_trans, '/local/domain/%d/backend/vusb/%d/%d/port' % (backend_vm_xid, vm_xid, frontend_dev))
if ports is None:
continue
for port in ports:
if not port.isdigit():
print >> sys.stderr, "Invalid port in VM %d frontend_dev %d" % (vm_xid, frontend_dev)
continue
port = int(port)
dev = xs.read(xs_trans, '/local/domain/%d/backend/vusb/%d/%d/port/%d' % (backend_vm_xid, vm_xid, frontend_dev, port))
if dev == "":
return '%d-%d' % (frontend_dev, port)
last_frontend_dev = frontend_dev
# FIXME: create a new frontend_dev and link it to the backend
raise QubesException("No unused frontends in VM %d found" % vm_xid)
def usb_attach(vm, backend_vm, device, frontend=None, auto_detach=False, wait=True):
device_attach_check(vm, backend_vm, device, frontend)
do_usb_attach(vm, backend_vm, device, frontend, auto_detach, wait)
def do_usb_attach(vm, backend_vm, device, frontend, auto_detach, wait):
if frontend is None:
frontend = usb_find_unused_frontend(vm)
frontend = usb_find_unused_frontend(backend_vm.xid, vm.xid)
else:
# Check if any device attached at this frontend
if usb_check_frontend_busy(vm, frontend):