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[libvirt] [PATCH v2 24/24] qemu: Isolate hostdevs on pSeries guests



All the pieces are now in place, so we can finally start
using isolation groups to achieve our initial goal, which is
separating hostdevs from emulated PCI devices while keeping
hostdevs that belong to the same host IOMMU group together.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1280542
Signed-off-by: Andrea Bolognani <abologna redhat com>
---
 src/qemu/qemu_domain_address.c                     | 105 +++++++++++++++++++++
 .../qemuxml2argv-pseries-hostdevs-1.args           |   8 +-
 .../qemuxml2argv-pseries-hostdevs-2.args           |   3 +-
 .../qemuxml2argv-pseries-hostdevs-3.args           |   2 +-
 .../qemuxml2xmlout-pseries-hostdevs-1.xml          |  14 ++-
 .../qemuxml2xmlout-pseries-hostdevs-2.xml          |   6 +-
 .../qemuxml2xmlout-pseries-hostdevs-3.xml          |   2 +-
 7 files changed, 130 insertions(+), 10 deletions(-)

diff --git a/src/qemu/qemu_domain_address.c b/src/qemu/qemu_domain_address.c
index 3d56900..395e0b9 100644
--- a/src/qemu/qemu_domain_address.c
+++ b/src/qemu/qemu_domain_address.c
@@ -906,6 +906,108 @@ qemuDomainFillAllPCIConnectFlags(virDomainDefPtr def,
 
 
 /**
+ * qemuDomainFillDeviceIsolationGroupIter:
+ * @def: domain definition
+ * @dev: device definition
+ * @info: device information
+ * @opaque: user data
+ *
+ * Fill isolation group information for a single device.
+ *
+ * You're not meant to call this directly, use
+ * qemuDomainFillAllIsolationGroups() instead.
+ *
+ * Return: 0 on success, <0 on failure
+ * */
+static int
+qemuDomainFillDeviceIsolationGroupIter(virDomainDefPtr def ATTRIBUTE_UNUSED,
+                                       virDomainDeviceDefPtr dev,
+                                       virDomainDeviceInfoPtr info,
+                                       void *opaque ATTRIBUTE_UNUSED)
+{
+    virDomainHostdevDefPtr hostdev;
+    virPCIDeviceAddressPtr hostAddr;
+
+    /* Only hostdev... */
+    if (dev->type != VIR_DOMAIN_DEVICE_HOSTDEV)
+        return 0;
+
+    hostdev = dev->data.hostdev;
+
+    /* ... of the PCI kind need this extra information */
+    if (hostdev->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS ||
+        hostdev->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI) {
+        return 0;
+    }
+
+    hostAddr = &hostdev->source.subsys.u.pci.addr;
+
+    /* The isolation group is simply the IOMMU group assigned by the host */
+    info->isolationGroup = virPCIDeviceAddressGetIOMMUGroupNum(hostAddr);
+
+    if (info->isolationGroup < 0) {
+        VIR_WARN("Can't look up isolation group for device %04x:%02x:%02x.%x",
+                 hostAddr->domain, hostAddr->bus,
+                 hostAddr->slot, hostAddr->function);
+    } else {
+        VIR_DEBUG("Isolation group for device %04x:%02x:%02x.%x is %d",
+                  hostAddr->domain, hostAddr->bus,
+                  hostAddr->slot, hostAddr->function,
+                  info->isolationGroup);
+    }
+
+    return info->isolationGroup;
+}
+
+
+/**
+ * qemuDomainFillAllIsolationGroups:
+ * @def: domain definition
+ *
+ * Fill isolation group information for all devices in @def.
+ *
+ * Return: 0 on success, <0 on failure
+ */
+static int
+qemuDomainFillAllIsolationGroups(virDomainDefPtr def)
+{
+    return virDomainDeviceInfoIterate(def,
+                                      qemuDomainFillDeviceIsolationGroupIter,
+                                      NULL);
+}
+
+
+static int
+qemuDomainSetupIsolationGroups(virDomainDefPtr def)
+{
+    virDomainControllerDefPtr defaultPHB;
+    int idx;
+    int ret = -1;
+
+    /* Only pSeries guests care about isolation groups at the moment */
+    if (!qemuDomainIsPSeries(def))
+        return 0;
+
+    if (qemuDomainFillAllIsolationGroups(def) < 0)
+        goto out;
+
+    idx = virDomainControllerFind(def, VIR_DOMAIN_CONTROLLER_TYPE_PCI, 0);
+    if (idx < 0)
+        goto out;
+
+    defaultPHB = def->controllers[idx];
+
+    /* We want to prevent hostdevs from being plugged into the default
+     * PHB, so we lock its isolation group */
+    defaultPHB->info.isolationGroupLocked = true;
+
+    ret = 0;
+
+ out:
+    return ret;
+}
+
+/**
  * qemuDomainFillDevicePCIConnectFlags:
  *
  * @def: the entire DomainDef
@@ -2076,6 +2178,9 @@ qemuDomainAssignPCIAddresses(virDomainDefPtr def,
     if (qemuDomainFillAllPCIConnectFlags(def, qemuCaps, driver) < 0)
         goto cleanup;
 
+    if (qemuDomainSetupIsolationGroups(def) < 0)
+        goto cleanup;
+
     if (nbuses > 0) {
         /* 1st pass to figure out how many PCI bridges we need */
         if (!(addrs = qemuDomainPCIAddressSetCreate(def, nbuses, true)))
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-pseries-hostdevs-1.args b/tests/qemuxml2argvdata/qemuxml2argv-pseries-hostdevs-1.args
index 88eb081..36f2def 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-pseries-hostdevs-1.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-pseries-hostdevs-1.args
@@ -18,6 +18,8 @@ QEMU_AUDIO_DRV=none \
 server,nowait \
 -mon chardev=charmonitor,id=monitor,mode=readline \
 -boot c \
--device vfio-pci,host=0001:01:00.0,id=hostdev0,bus=pci.0,addr=0x1 \
--device vfio-pci,host=0005:90:01.0,id=hostdev1,bus=pci.0,addr=0x2 \
--device vfio-pci,host=0001:01:00.1,id=hostdev2,bus=pci.0,addr=0x3
+-device spapr-pci-host-bridge,index=1,id=pci.1 \
+-device spapr-pci-host-bridge,index=2,id=pci.2 \
+-device vfio-pci,host=0001:01:00.0,id=hostdev0,bus=pci.1.0,addr=0x1 \
+-device vfio-pci,host=0005:90:01.0,id=hostdev1,bus=pci.2.0,addr=0x1 \
+-device vfio-pci,host=0001:01:00.1,id=hostdev2,bus=pci.1.0,addr=0x2
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-pseries-hostdevs-2.args b/tests/qemuxml2argvdata/qemuxml2argv-pseries-hostdevs-2.args
index 83d4306..cd5b664 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-pseries-hostdevs-2.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-pseries-hostdevs-2.args
@@ -19,6 +19,7 @@ server,nowait \
 -mon chardev=charmonitor,id=monitor,mode=readline \
 -boot c \
 -device spapr-pci-host-bridge,index=1,id=pci.1 \
+-device spapr-pci-host-bridge,index=2,id=pci.2 \
 -device virtio-scsi-pci,id=scsi0,bus=pci.1.0,addr=0x1 \
 -device vfio-pci,host=0001:01:00.0,id=hostdev0,bus=pci.1.0,addr=0x2 \
--device vfio-pci,host=0005:90:01.0,id=hostdev1,bus=pci.0,addr=0x1
+-device vfio-pci,host=0005:90:01.0,id=hostdev1,bus=pci.2.0,addr=0x1
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-pseries-hostdevs-3.args b/tests/qemuxml2argvdata/qemuxml2argv-pseries-hostdevs-3.args
index eda6cc7..66a31ba 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-pseries-hostdevs-3.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-pseries-hostdevs-3.args
@@ -21,4 +21,4 @@ server,nowait \
 -device spapr-pci-host-bridge,index=1,id=pci.1 \
 -device spapr-pci-host-bridge,index=2,id=pci.2 \
 -device vfio-pci,host=0001:01:00.0,id=hostdev0,bus=pci.2.0,addr=0x1 \
--device vfio-pci,host=0001:01:00.1,id=hostdev1,bus=pci.0,addr=0x1
+-device vfio-pci,host=0001:01:00.1,id=hostdev1,bus=pci.2.0,addr=0x2
diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-pseries-hostdevs-1.xml b/tests/qemuxml2xmloutdata/qemuxml2xmlout-pseries-hostdevs-1.xml
index 34defea..494c414 100644
--- a/tests/qemuxml2xmloutdata/qemuxml2xmlout-pseries-hostdevs-1.xml
+++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-pseries-hostdevs-1.xml
@@ -19,26 +19,34 @@
       <model name='spapr-pci-host-bridge'/>
       <target index='0'/>
     </controller>
+    <controller type='pci' index='1' model='pci-root'>
+      <model name='spapr-pci-host-bridge'/>
+      <target index='1'/>
+    </controller>
+    <controller type='pci' index='2' model='pci-root'>
+      <model name='spapr-pci-host-bridge'/>
+      <target index='2'/>
+    </controller>
     <hostdev mode='subsystem' type='pci' managed='yes'>
       <driver name='vfio'/>
       <source>
         <address domain='0x0001' bus='0x01' slot='0x00' function='0x0'/>
       </source>
-      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/>
+      <address type='pci' domain='0x0000' bus='0x01' slot='0x01' function='0x0'/>
     </hostdev>
     <hostdev mode='subsystem' type='pci' managed='yes'>
       <driver name='vfio'/>
       <source>
         <address domain='0x0005' bus='0x90' slot='0x01' function='0x0'/>
       </source>
-      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
+      <address type='pci' domain='0x0000' bus='0x02' slot='0x01' function='0x0'/>
     </hostdev>
     <hostdev mode='subsystem' type='pci' managed='yes'>
       <driver name='vfio'/>
       <source>
         <address domain='0x0001' bus='0x01' slot='0x00' function='0x1'/>
       </source>
-      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
+      <address type='pci' domain='0x0000' bus='0x01' slot='0x02' function='0x0'/>
     </hostdev>
     <memballoon model='none'/>
     <panic model='pseries'/>
diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-pseries-hostdevs-2.xml b/tests/qemuxml2xmloutdata/qemuxml2xmlout-pseries-hostdevs-2.xml
index 17ff4c8..cfa395b 100644
--- a/tests/qemuxml2xmloutdata/qemuxml2xmlout-pseries-hostdevs-2.xml
+++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-pseries-hostdevs-2.xml
@@ -26,6 +26,10 @@
       <model name='spapr-pci-host-bridge'/>
       <target index='1'/>
     </controller>
+    <controller type='pci' index='2' model='pci-root'>
+      <model name='spapr-pci-host-bridge'/>
+      <target index='2'/>
+    </controller>
     <hostdev mode='subsystem' type='pci' managed='yes'>
       <driver name='vfio'/>
       <source>
@@ -38,7 +42,7 @@
       <source>
         <address domain='0x0005' bus='0x90' slot='0x01' function='0x0'/>
       </source>
-      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/>
+      <address type='pci' domain='0x0000' bus='0x02' slot='0x01' function='0x0'/>
     </hostdev>
     <memballoon model='none'/>
     <panic model='pseries'/>
diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-pseries-hostdevs-3.xml b/tests/qemuxml2xmloutdata/qemuxml2xmlout-pseries-hostdevs-3.xml
index 58023ec..f91959b 100644
--- a/tests/qemuxml2xmloutdata/qemuxml2xmlout-pseries-hostdevs-3.xml
+++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-pseries-hostdevs-3.xml
@@ -39,7 +39,7 @@
       <source>
         <address domain='0x0001' bus='0x01' slot='0x00' function='0x1'/>
       </source>
-      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/>
+      <address type='pci' domain='0x0000' bus='0x02' slot='0x02' function='0x0'/>
     </hostdev>
     <memballoon model='none'/>
     <panic model='pseries'/>
-- 
2.7.5


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