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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] vtd hotplug: check if a device can be hot-plugged.
# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1231154058 0
# Node ID f76f1294d82c87871e274d92282d092a0fdc09f5
# Parent b3a9bc72624166a230da74c498154ae2cb45eacc
vtd hotplug: check if a device can be hot-plugged.
When we statically assign a pci device (the pci=3D['xx:xx.x'] string
in guest config file) to guest, we make many checkings (for instance,
if the device is specified in 'pciback.hide', if it has
non-page-aligned MMIO BARs, if it has a proper FLR capability, if the
related devices should be co-assigned). However, with respect to the
guest hotplug, we only check if the device exists and not assigned yet
-- this is not enough, for instance, now xend allows us to assign an
in-use device (being used by Dom0) to an HVM guest (because
xc.test_assigned() returns OK) -- this will cause disaster... The
patch adds some necessary checkings.
Signed-off-by: Dexuan Cui <dexuan.cui@xxxxxxxxx>
---
tools/python/xen/util/pci.py | 16 ++++-
tools/python/xen/xend/XendDomainInfo.py | 90 +++++++++++++++++++++++++++++---
tools/python/xen/xend/server/pciif.py | 2
3 files changed, 97 insertions(+), 11 deletions(-)
diff -r b3a9bc726241 -r f76f1294d82c tools/python/xen/util/pci.py
--- a/tools/python/xen/util/pci.py Mon Jan 05 11:13:22 2009 +0000
+++ b/tools/python/xen/util/pci.py Mon Jan 05 11:14:18 2009 +0000
@@ -276,7 +276,7 @@ def check_FLR_capability(dev_list):
coassigned_pci_list = dev.find_all_the_multi_functions()
need_transform = True
elif dev.dev_type == DEV_TYPE_PCI and not dev.pci_af_flr:
- coassigned_pci_list = dev.find_coassigned_devices(True)
+ coassigned_pci_list = dev.find_coassigned_pci_devices(True)
del coassigned_pci_list[0]
need_transform = True
@@ -434,7 +434,7 @@ class PciDevice:
list = list + [dev.name]
return list
- def find_coassigned_devices(self, ignore_bridge = True):
+ def find_coassigned_pci_devices(self, ignore_bridge = True):
''' Here'self' is a PCI device, we need find the uppermost PCI/PCI-X
bridge, and all devices behind it must be co-assigned to the same
guest.
@@ -532,6 +532,16 @@ class PciDevice:
funcs = re.findall(p, pci_names)
return funcs
+ def find_coassigned_devices(self):
+ if self.dev_type == DEV_TYPE_PCIe_ENDPOINT and not self.pcie_flr:
+ return self.find_all_the_multi_functions()
+ elif self.dev_type == DEV_TYPE_PCI and not self.pci_af_flr:
+ coassigned_pci_list = self.find_coassigned_pci_devices(True)
+ del coassigned_pci_list[0]
+ return coassigned_pci_list
+ else:
+ return [self.name]
+
def find_cap_offset(self, cap):
path = find_sysfs_mnt()+SYSFS_PCI_DEVS_PATH+'/'+ \
self.name+SYSFS_PCI_DEV_CONFIG_PATH
@@ -718,7 +728,7 @@ class PciDevice:
if self.bus == 0:
self.do_FLR_for_integrated_device()
else:
- devs = self.find_coassigned_devices(False)
+ devs = self.find_coassigned_pci_devices(False)
# Remove the element 0 which is a bridge
target_bus = devs[0]
del devs[0]
diff -r b3a9bc726241 -r f76f1294d82c tools/python/xen/xend/XendDomainInfo.py
--- a/tools/python/xen/xend/XendDomainInfo.py Mon Jan 05 11:13:22 2009 +0000
+++ b/tools/python/xen/xend/XendDomainInfo.py Mon Jan 05 11:14:18 2009 +0000
@@ -290,19 +290,21 @@ def dom_get(dom):
log.trace("domain_getinfo(%d) failed, ignoring: %s", dom, str(err))
return None
-def do_FLR(domid):
- from xen.xend.server.pciif import parse_pci_name, PciDevice
+def get_assigned_pci_devices(domid):
+ dev_str_list = []
path = '/local/domain/0/backend/pci/%u/0/' % domid
num_devs = xstransact.Read(path + 'num_devs');
if num_devs is None or num_devs == "":
- return;
-
- num_devs = int(xstransact.Read(path + 'num_devs'));
-
- dev_str_list = []
+ return dev_str_list
+ num_devs = int(num_devs);
for i in range(num_devs):
dev_str = xstransact.Read(path + 'dev-%i' % i)
dev_str_list = dev_str_list + [dev_str]
+ return dev_str_list
+
+def do_FLR(domid):
+ from xen.xend.server.pciif import parse_pci_name, PciDevice
+ dev_str_list = get_assigned_pci_devices(domid)
for dev_str in dev_str_list:
(dom, b, d, f) = parse_pci_name(dev_str)
@@ -645,6 +647,55 @@ class XendDomainInfo:
" already been assigned to other domain, or maybe"
" it doesn't exist." % (bus, dev, func))
+ # Here, we duplicate some checkings (in some cases, we mustn't allow
+ # a device to be hot-plugged into an HVM guest) that are also done in
+ # pci_device_configure()'s self.device_create(dev_sxp) or
+ # dev_control.reconfigureDevice(devid, dev_config).
+ # We must make the checkings before sending the command 'pci-ins' to
+ # ioemu.
+
+ # Test whether the device is owned by pciback. For instance, we can't
+ # hotplug a device being used by Dom0 itself to an HVM guest.
+ from xen.xend.server.pciif import PciDevice, parse_pci_name
+ domain = int(new_dev['domain'],16)
+ bus = int(new_dev['bus'],16)
+ dev = int(new_dev['slot'],16)
+ func = int(new_dev['func'],16)
+ try:
+ pci_device = PciDevice(domain, bus, dev, func)
+ except Exception, e:
+ raise VmError("pci: failed to locate device and "+
+ "parse it's resources - "+str(e))
+ if pci_device.driver!='pciback':
+ raise VmError(("pci: PCI Backend does not own device "+ \
+ "%s\n"+ \
+ "See the pciback.hide kernel "+ \
+ "command-line parameter or\n"+ \
+ "bind your slot/device to the PCI backend using sysfs" \
+ )%(pci_device.name))
+
+ # Check non-page-aligned MMIO BAR.
+ if pci_device.has_non_page_aligned_bar and arch.type != "ia64":
+ raise VmError("pci: %s: non-page-aligned MMIO BAR found." % \
+ pci_device.name)
+
+ # Check the co-assignment.
+ # To pci-attach a device D to domN, we should ensure each of D's
+ # co-assignment devices hasn't been assigned, or has been assigned to
+ # domN.
+ coassignment_list = pci_device.find_coassigned_devices()
+ assigned_pci_device_str_list = get_assigned_pci_devices(self.domid)
+ for pci_str in coassignment_list:
+ (domain, bus, dev, func) = parse_pci_name(pci_str)
+ dev_str = '0x%x,0x%x,0x%x,0x%x' % (domain, bus, dev, func)
+ if xc.test_assign_device(self.domid, dev_str) == 0:
+ continue
+ if not pci_str in assigned_pci_device_str_list:
+ raise VmError(('pci: failed to pci-attach %s to dom%d" + \
+ " because one of its co-assignment device %s has been" + \
+ " assigned to other domain.' \
+ )% (pci_device.name, self.domid, pci_str))
+
bdf_str = "%s:%s:%s.%s@%s" % (new_dev['domain'],
new_dev['bus'],
new_dev['slot'],
@@ -935,6 +986,31 @@ class XendDomainInfo:
if vslot == 0:
raise VmError("Device @ vslot 0x%x do not support hotplug." %
(vslot))
+ # Check the co-assignment.
+ # To pci-detach a device D from domN, we should ensure: for each DD in
the
+ # list of D's co-assignment devices, DD is not assigned (to domN).
+ #
+ from xen.xend.server.pciif import PciDevice
+ domain = int(x['domain'],16)
+ bus = int(x['bus'],16)
+ dev = int(x['slot'],16)
+ func = int(x['func'],16)
+ try:
+ pci_device = PciDevice(domain, bus, dev, func)
+ except Exception, e:
+ raise VmError("pci: failed to locate device and "+
+ "parse it's resources - "+str(e))
+ coassignment_list = pci_device.find_coassigned_devices()
+ coassignment_list.remove(pci_device.name)
+ assigned_pci_device_str_list = get_assigned_pci_devices(self.domid)
+ for pci_str in coassignment_list:
+ if pci_str in assigned_pci_device_str_list:
+ raise VmError(('pci: failed to pci-detach %s from dom%d" + \
+ " because one of its co-assignment device %s is still " + \
+ " assigned to the domain.' \
+ )% (pci_device.name, self.domid, pci_str))
+
+
bdf_str = "%s:%s:%s.%s" % (x['domain'], x['bus'], x['slot'], x['func'])
log.info("hvm_destroyPCIDevice:%s:%s!", x, bdf_str)
diff -r b3a9bc726241 -r f76f1294d82c tools/python/xen/xend/server/pciif.py
--- a/tools/python/xen/xend/server/pciif.py Mon Jan 05 11:13:22 2009 +0000
+++ b/tools/python/xen/xend/server/pciif.py Mon Jan 05 11:14:18 2009 +0000
@@ -417,7 +417,7 @@ class PciController(DevController):
else:
# All devices behind the uppermost PCI/PCI-X bridge must
be\
# co-assigned to the same guest.
- devs_str = dev.find_coassigned_devices(True)
+ devs_str = dev.find_coassigned_pci_devices(True)
# Remove the element 0 which is a bridge
del devs_str[0]
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