[libvirt] [PATCH 4/3] conf: restrict expander buses to connect only to a root bus
Laine Stump
laine at laine.org
Sat Aug 6 23:22:07 UTC 2016
More misunderstanding/mistaken assumptions on my part - I had thought
that a pci-expander-bus could be plugged into any legacy PCI slot, and
that pcie-expander-bus could be plugged into any PCIe slot. This isn't
correct - they can both be plugged ontly into their respective root
buses. This patch adds that restriction.
---
src/conf/domain_addr.c | 38 ++++++++++++-----
src/conf/domain_addr.h | 6 ++-
src/qemu/qemu_domain_address.c | 2 +
.../qemuxml2argv-pci-expander-bus-bad-bus.xml | 26 ++++++++++++
.../qemuxml2argv-pcie-expander-bus-bad-bus.xml | 48 ++++++++++++++++++++++
tests/qemuxml2argvtest.c | 8 ++++
6 files changed, 116 insertions(+), 12 deletions(-)
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-pci-expander-bus-bad-bus.xml
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-pcie-expander-bus-bad-bus.xml
diff --git a/src/conf/domain_addr.c b/src/conf/domain_addr.c
index caffd71..27c41cd 100644
--- a/src/conf/domain_addr.c
+++ b/src/conf/domain_addr.c
@@ -51,20 +51,25 @@ virDomainPCIControllerModelToConnectType(virDomainControllerModelPCI model)
return 0;
case VIR_DOMAIN_CONTROLLER_MODEL_PCI_BRIDGE:
- case VIR_DOMAIN_CONTROLLER_MODEL_PCI_EXPANDER_BUS:
- /* pci-bridge and pci-expander-bus are treated like a standard
- * PCI endpoint device, because they can plug into any
- * standard PCI slot.
+ /* pci-bridge is treated like a standard
+ * PCI endpoint device, because it can plug into any
+ * standard PCI slot (it just can't be hotplugged).
*/
return VIR_PCI_CONNECT_TYPE_PCI_DEVICE;
+ case VIR_DOMAIN_CONTROLLER_MODEL_PCI_EXPANDER_BUS:
+ /* pci-expander-bus can only be plugged into pci-root
+ * (and pci-root is the only bus that has this flag set)
+ */
+ return VIR_PCI_CONNECT_TYPE_PCI_EXPANDER_BUS;
+
case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_EXPANDER_BUS:
- /* pcie-expander-bus is treated like a standard PCIe endpoint
- * device (the part of pcie-expander-bus that is plugged in
- * isn't the expander bus itself, but a companion device used
- * for setting it up).
+ /* pcie-expander-bus can only be plugged into pcie-root (the
+ * part of pcie-expander-bus that is plugged in isn't the
+ * expander bus itself, but a companion device used for
+ * setting it up).
*/
- return VIR_PCI_CONNECT_TYPE_PCIE_DEVICE;
+ return VIR_PCI_CONNECT_TYPE_PCIE_EXPANDER_BUS;
case VIR_DOMAIN_CONTROLLER_MODEL_DMI_TO_PCI_BRIDGE:
return VIR_PCI_CONNECT_TYPE_DMI_TO_PCI_BRIDGE;
@@ -135,6 +140,10 @@ virDomainPCIAddressFlagsCompatible(virPCIDeviceAddressPtr addr,
connectStr = "pci-switch-upstream-port";
} else if (devFlags & VIR_PCI_CONNECT_TYPE_PCIE_SWITCH_DOWNSTREAM_PORT) {
connectStr = "pci-switch-downstream-port";
+ } else if (devFlags & VIR_PCI_CONNECT_TYPE_PCI_EXPANDER_BUS) {
+ connectStr = "pci-expander-bus";
+ } else if (devFlags & VIR_PCI_CONNECT_TYPE_PCIE_EXPANDER_BUS) {
+ connectStr = "pcie-expander-bus";
} else {
/* this should never happen. If it does, there is a
* bug in the code that sets the flag bits for devices.
@@ -241,9 +250,15 @@ virDomainPCIAddressBusSetModel(virDomainPCIAddressBusPtr bus,
* bus.
*/
switch (model) {
- case VIR_DOMAIN_CONTROLLER_MODEL_PCI_BRIDGE:
case VIR_DOMAIN_CONTROLLER_MODEL_PCI_ROOT:
bus->flags = (VIR_PCI_CONNECT_HOTPLUGGABLE |
+ VIR_PCI_CONNECT_TYPE_PCI_DEVICE
+ | VIR_PCI_CONNECT_TYPE_PCI_EXPANDER_BUS);
+ bus->minSlot = 1;
+ bus->maxSlot = VIR_PCI_ADDRESS_SLOT_LAST;
+ break;
+ case VIR_DOMAIN_CONTROLLER_MODEL_PCI_BRIDGE:
+ bus->flags = (VIR_PCI_CONNECT_HOTPLUGGABLE |
VIR_PCI_CONNECT_TYPE_PCI_DEVICE);
bus->minSlot = 1;
bus->maxSlot = VIR_PCI_ADDRESS_SLOT_LAST;
@@ -263,7 +278,8 @@ virDomainPCIAddressBusSetModel(virDomainPCIAddressBusPtr bus,
*/
bus->flags = (VIR_PCI_CONNECT_TYPE_PCIE_DEVICE
| VIR_PCI_CONNECT_TYPE_PCIE_ROOT_PORT
- | VIR_PCI_CONNECT_TYPE_DMI_TO_PCI_BRIDGE);
+ | VIR_PCI_CONNECT_TYPE_DMI_TO_PCI_BRIDGE
+ | VIR_PCI_CONNECT_TYPE_PCIE_EXPANDER_BUS);
bus->minSlot = 1;
bus->maxSlot = VIR_PCI_ADDRESS_SLOT_LAST;
break;
diff --git a/src/conf/domain_addr.h b/src/conf/domain_addr.h
index 4ce4139..596cd4c 100644
--- a/src/conf/domain_addr.h
+++ b/src/conf/domain_addr.h
@@ -41,6 +41,8 @@ typedef enum {
VIR_PCI_CONNECT_TYPE_PCIE_SWITCH_UPSTREAM_PORT = 1 << 4,
VIR_PCI_CONNECT_TYPE_PCIE_SWITCH_DOWNSTREAM_PORT = 1 << 5,
VIR_PCI_CONNECT_TYPE_DMI_TO_PCI_BRIDGE = 1 << 6,
+ VIR_PCI_CONNECT_TYPE_PCI_EXPANDER_BUS = 1 << 7,
+ VIR_PCI_CONNECT_TYPE_PCIE_EXPANDER_BUS = 1 << 8,
} virDomainPCIConnectFlags;
/* a combination of all bits that describe the type of connections
@@ -51,7 +53,9 @@ typedef enum {
VIR_PCI_CONNECT_TYPE_PCIE_SWITCH_UPSTREAM_PORT | \
VIR_PCI_CONNECT_TYPE_PCIE_SWITCH_DOWNSTREAM_PORT | \
VIR_PCI_CONNECT_TYPE_PCIE_ROOT_PORT | \
- VIR_PCI_CONNECT_TYPE_DMI_TO_PCI_BRIDGE)
+ VIR_PCI_CONNECT_TYPE_DMI_TO_PCI_BRIDGE | \
+ VIR_PCI_CONNECT_TYPE_PCI_EXPANDER_BUS | \
+ VIR_PCI_CONNECT_TYPE_PCIE_EXPANDER_BUS)
/* combination of all bits that could be used to connect a normal
* endpoint device (i.e. excluding the connection possible between an
diff --git a/src/qemu/qemu_domain_address.c b/src/qemu/qemu_domain_address.c
index 3d52d72..202f92b 100644
--- a/src/qemu/qemu_domain_address.c
+++ b/src/qemu/qemu_domain_address.c
@@ -1014,6 +1014,8 @@ qemuDomainAssignDevicePCISlots(virDomainDefPtr def,
* controller/bus to connect it to on the upstream side.
*/
flags = virDomainPCIControllerModelToConnectType(model);
+ VIR_WARN("flags = %04x model = %d",
+ flags, model);
if (virDomainPCIAddressReserveNextSlot(addrs,
&def->controllers[i]->info,
flags) < 0)
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-pci-expander-bus-bad-bus.xml b/tests/qemuxml2argvdata/qemuxml2argv-pci-expander-bus-bad-bus.xml
new file mode 100644
index 0000000..85c1115
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-pci-expander-bus-bad-bus.xml
@@ -0,0 +1,26 @@
+<domain type='qemu'>
+ <name>expander-test</name>
+ <uuid>3ec6cbe1-b5a2-4515-b800-31a61855df41</uuid>
+ <memory unit='KiB'>219100</memory>
+ <currentMemory unit='KiB'>219100</currentMemory>
+ <vcpu placement='static'>16</vcpu>
+ <os>
+ <type arch='x86_64' machine='pc-i440fx-2.5'>hvm</type>
+ </os>
+ <devices>
+ <emulator>/usr/bin/qemu-system-x86_64</emulator>
+ <controller type='usb' index='0' model='none'/>
+ <controller type='ide' index='0'>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
+ </controller>
+ <controller type='pci' index='0' model='pci-root'/>
+ <controller type='pci' index='1' model='pci-bridge'>
+ </controller>
+ <controller type='pci' index='2' model='pci-expander-bus'>
+ <address type='pci' bus='1' slot='1'/>
+ </controller>
+ <input type='mouse' bus='ps2'/>
+ <input type='keyboard' bus='ps2'/>
+ <memballoon model='none'/>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-pcie-expander-bus-bad-bus.xml b/tests/qemuxml2argvdata/qemuxml2argv-pcie-expander-bus-bad-bus.xml
new file mode 100644
index 0000000..0305f35
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-pcie-expander-bus-bad-bus.xml
@@ -0,0 +1,48 @@
+<domain type='qemu'>
+ <name>pcie-expander-bus-test</name>
+ <uuid>11dbdcdd-4c3b-482b-8903-9bdb8c0a2774</uuid>
+ <memory unit='KiB'>2097152</memory>
+ <currentMemory unit='KiB'>2097152</currentMemory>
+ <vcpu placement='static'>16</vcpu>
+ <os>
+ <type arch='x86_64' machine='q35'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <cpu>
+ <topology sockets='2' cores='4' threads='2'/>
+ <numa>
+ <cell cpus='0-7' memory='109550' unit='KiB'/>
+ <cell cpus='8-15' memory='109550' unit='KiB'/>
+ </numa>
+ </cpu>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/libexec/qemu-kvm</emulator>
+ <disk type='block' device='disk'>
+ <source dev='/dev/HostVG/QEMUGuest1'/>
+ <target dev='sda' bus='sata'/>
+ <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+ </disk>
+ <controller type='pci' index='0' model='pcie-root'/>
+ <controller type='pci' index='1' model='dmi-to-pci-bridge'>
+ <model name='i82801b11-bridge'/>
+ </controller>
+ <controller type='pci' index='2' model='pci-bridge'>
+ <model name='pci-bridge'/>
+ <target chassisNr='56'/>
+ </controller>
+ <controller type='pci' index='3' model='pcie-root-port'>
+ <target busNr='220'>
+ <node>1</node>
+ </target>
+ <address type='pci' bus='0x00'/>
+ </controller>
+ <controller type='pci' index='4' model='pcie-expander-bus'>
+ <address type='pci' bus='3'/>
+ </controller>
+ <memballoon model='none'/>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 933f9be..2de4f0a 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -1738,6 +1738,9 @@ mymain(void)
DO_TEST_PARSE_ERROR("pci-expander-bus-bad-machine",
QEMU_CAPS_DEVICE_PCI_BRIDGE,
QEMU_CAPS_DEVICE_PXB);
+ DO_TEST_PARSE_ERROR("pci-expander-bus-bad-bus",
+ QEMU_CAPS_DEVICE_PCI_BRIDGE,
+ QEMU_CAPS_DEVICE_PXB);
DO_TEST("pcie-expander-bus",
QEMU_CAPS_DEVICE_PCI_BRIDGE,
@@ -1753,6 +1756,11 @@ mymain(void)
QEMU_CAPS_DEVICE_X3130_UPSTREAM,
QEMU_CAPS_DEVICE_XIO3130_DOWNSTREAM,
QEMU_CAPS_DEVICE_PXB_PCIE);
+ DO_TEST_PARSE_ERROR("pcie-expander-bus-bad-bus",
+ QEMU_CAPS_DEVICE_PCI_BRIDGE,
+ QEMU_CAPS_DEVICE_DMI_TO_PCI_BRIDGE,
+ QEMU_CAPS_DEVICE_IOH3420,
+ QEMU_CAPS_DEVICE_PXB_PCIE);
DO_TEST("hostdev-scsi-lsi",
QEMU_CAPS_VIRTIO_SCSI, QEMU_CAPS_SCSI_LSI,
--
2.7.4
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