qemu: introduce vfio-ccw capability

Let us introduce the capability vfio-ccw for supporting the basic
channel I/O passthrough, which have been introduced in QEMU 2.10. The
current focus is to support dasd-eckd (cu_type/dev_type = 0x3990/0x3390)
as the target device.

Let us also introduce the capability QEMU_CAPS_CCW_CSSID_UNRESTRICTED
for virtual-css-bridge. This capability is based on the
cssid-unrestricted property which exists if QEMU no longer enforces
cssid restrictions based on ccw device types.

Vfio-ccw capability is dependent on the hidden virtual-css-bridge, so
that we are able to probe for the cssid-unrestriced property to make
sure the devices are visible to non-mcss-e enabled guests.
Signed-off-by: NShalini Chellathurai Saroja <shalini@linux.vnet.ibm.com>
Reviewed-by: NBjoern Walk <bwalk@linux.ibm.com>
Reviewed-by: NBoris Fiuczynski <fiuczy@linux.ibm.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

src/qemu/qemu_capabilities.c

@@ -481,6 +481,8 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
               "qom-list-properties",
               "memory-backend-file.discard-data",
               "virtual-css-bridge",
+              "virtual-css-bridge.cssid-unrestricted",
+              "vfio-ccw",
     );
 
 
@@ -1110,6 +1112,7 @@ struct virQEMUCapsStringFlags virQEMUCapsObjectTypes[] = {
     { "pcie-pci-bridge", QEMU_CAPS_DEVICE_PCIE_PCI_BRIDGE },
     { "pr-manager-helper", QEMU_CAPS_PR_MANAGER_HELPER },
     { "virtual-css-bridge", QEMU_CAPS_CCW },
+    { "vfio-ccw", QEMU_CAPS_DEVICE_VFIO_CCW },
 };
 
 static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsVirtioBalloon[] = {
@@ -1251,6 +1254,10 @@ static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsIntelIOMMU[] = {
     { "device-iotlb", QEMU_CAPS_INTEL_IOMMU_DEVICE_IOTLB },
 };
 
+static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsVirtualCSSBridge[] = {
+    { "cssid-unrestricted", QEMU_CAPS_CCW_CSSID_UNRESTRICTED },
+};
+
 /* see documentation for virQEMUQAPISchemaPathGet for the query format */
 static struct virQEMUCapsStringFlags virQEMUCapsQMPSchemaQueries[] = {
     { "blockdev-add/arg-type/options/+gluster/debug-level", QEMU_CAPS_GLUSTER_DEBUG_LEVEL},
@@ -1376,6 +1383,9 @@ static virQEMUCapsObjectTypeProps virQEMUCapsDeviceProps[] = {
     { "virtio-gpu-ccw", virQEMUCapsDevicePropsVirtioGpu,
       ARRAY_CARDINALITY(virQEMUCapsDevicePropsVirtioGpu),
       QEMU_CAPS_DEVICE_VIRTIO_GPU_CCW },
+    { "virtual-css-bridge", virQEMUCapsObjectPropsVirtualCSSBridge,
+      ARRAY_CARDINALITY(virQEMUCapsObjectPropsVirtualCSSBridge),
+      QEMU_CAPS_CCW },
 };
 
 static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsMemoryBackendFile[] = {
@@ -3937,6 +3947,8 @@ virQEMUCapsInitQMPMonitor(virQEMUCapsPtr qemuCaps,
         if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_CCW) &&
             virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_CCW))
             virQEMUCapsSet(qemuCaps, QEMU_CAPS_CCW);
+        if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_CCW_CSSID_UNRESTRICTED))
+            virQEMUCapsClear(qemuCaps, QEMU_CAPS_DEVICE_VFIO_CCW);
     }
 
     ret = 0;

src/qemu/qemu_capabilities.h

@@ -465,6 +465,8 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
     QEMU_CAPS_QOM_LIST_PROPERTIES, /* qom-list-properties monitor command */
     QEMU_CAPS_OBJECT_MEMORY_FILE_DISCARD, /* -object memory-backend-file,discard-data */
     QEMU_CAPS_CCW, /* -device virtual-css-bridge */
+    QEMU_CAPS_CCW_CSSID_UNRESTRICTED, /* virtual-css-bridge.cssid-unrestricted= */
+    QEMU_CAPS_DEVICE_VFIO_CCW, /* -device vfio-ccw */
 
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;

tests/qemucapabilitiesdata/caps_2.10.0.s390x.replies

@@ -3402,6 +3402,16 @@
   "id": "libvirt-33"
 }
 
+{
+  "return": [
+    {
+      "name": "css_dev_path",
+      "type": "bool"
+    }
+  ],
+  "id": "libvirt-34"
+}
+
 {
   "return": [
     {
@@ -3447,7 +3457,7 @@
       "cpu-max": 248
     }
   ],
-  "id": "libvirt-34"
+  "id": "libvirt-35"
 }
 
 {
@@ -3981,19 +3991,19 @@
       "migration-safe": true
     }
   ],
-  "id": "libvirt-35"
+  "id": "libvirt-36"
 }
 
 {
   "return": [
   ],
-  "id": "libvirt-36"
+  "id": "libvirt-37"
 }
 
 {
   "return": [
   ],
-  "id": "libvirt-37"
+  "id": "libvirt-38"
 }
 
 {
@@ -5098,7 +5108,7 @@
       "option": "drive"
     }
   ],
-  "id": "libvirt-38"
+  "id": "libvirt-39"
 }
 
 {
@@ -5148,7 +5158,7 @@
       "capability": "return-path"
     }
   ],
-  "id": "libvirt-39"
+  "id": "libvirt-40"
 }
 
 {
@@ -14871,7 +14881,7 @@
       "meta-type": "object"
     }
   ],
-  "id": "libvirt-40"
+  "id": "libvirt-41"
 }
 
 {
@@ -14911,11 +14921,11 @@
       }
     }
   },
-  "id": "libvirt-41"
+  "id": "libvirt-42"
 }
 
 {
-  "id": "libvirt-42",
+  "id": "libvirt-43",
   "error": {
     "class": "GenericError",
     "desc": "Property '.migratable' not found"

tests/qemucapabilitiesdata/caps_2.10.0.s390x.xml

@@ -117,7 +117,7 @@
   <flag name='virtual-css-bridge'/>
   <version>2010000</version>
   <kvmVersion>0</kvmVersion>
-  <microcodeVersion>303326</microcodeVersion>
+  <microcodeVersion>303434</microcodeVersion>
   <package></package>
   <arch>s390x</arch>
   <hostCPU type='kvm' model='z14-base' migratability='no'>

tests/qemucapabilitiesdata/caps_2.11.0.s390x.replies

@@ -3521,6 +3521,16 @@
   "id": "libvirt-34"
 }
 
+{
+  "return": [
+    {
+      "name": "css_dev_path",
+      "type": "bool"
+    }
+  ],
+  "id": "libvirt-35"
+}
+
 {
   "return": [
     {
@@ -3571,7 +3581,7 @@
       "cpu-max": 248
     }
   ],
-  "id": "libvirt-35"
+  "id": "libvirt-36"
 }
 
 {
@@ -4105,20 +4115,20 @@
       "migration-safe": true
     }
   ],
-  "id": "libvirt-36"
+  "id": "libvirt-37"
 }
 
 {
   "return": [
   ],
-  "id": "libvirt-37"
+  "id": "libvirt-38"
 }
 
 {
   "return": [
     "emulator"
   ],
-  "id": "libvirt-38"
+  "id": "libvirt-39"
 }
 
 {
@@ -5239,7 +5249,7 @@
       "option": "drive"
     }
   ],
-  "id": "libvirt-39"
+  "id": "libvirt-40"
 }
 
 {
@@ -5297,7 +5307,7 @@
       "capability": "x-multifd"
     }
   ],
-  "id": "libvirt-40"
+  "id": "libvirt-41"
 }
 
 {
@@ -15165,7 +15175,7 @@
       "meta-type": "object"
     }
   ],
-  "id": "libvirt-41"
+  "id": "libvirt-42"
 }
 
 {
@@ -15204,11 +15214,11 @@
       }
     }
   },
-  "id": "libvirt-42"
+  "id": "libvirt-43"
 }
 
 {
-  "id": "libvirt-43",
+  "id": "libvirt-44",
   "error": {
     "class": "GenericError",
     "desc": "Property '.migratable' not found"

tests/qemucapabilitiesdata/caps_2.11.0.s390x.xml

@@ -123,7 +123,7 @@
   <flag name='virtual-css-bridge'/>
   <version>2011000</version>
   <kvmVersion>0</kvmVersion>
-  <microcodeVersion>342058</microcodeVersion>
+  <microcodeVersion>342166</microcodeVersion>
   <package></package>
   <arch>s390x</arch>
   <hostCPU type='kvm' model='z14-base' migratability='no'>

tests/qemucapabilitiesdata/caps_2.12.0.s390x.replies

@@ -3614,6 +3614,21 @@
   "id": "libvirt-34"
 }
 
+{
+  "return": [
+    {
+      "name": "cssid-unrestricted",
+      "description": "A css device can use any cssid, regardless whether virtual or not (read only, always true)",
+      "type": "bool"
+    },
+    {
+      "name": "css_dev_path",
+      "type": "bool"
+    }
+  ],
+  "id": "libvirt-35"
+}
+
 {
   "return": [
     {
@@ -3665,7 +3680,7 @@
       "type": "string"
     }
   ],
-  "id": "libvirt-35"
+  "id": "libvirt-36"
 }
 
 {
@@ -3723,7 +3738,7 @@
       "alias": "s390-ccw-virtio"
     }
   ],
-  "id": "libvirt-36"
+  "id": "libvirt-37"
 }
 
 {
@@ -6378,20 +6393,20 @@
       "migration-safe": true
     }
   ],
-  "id": "libvirt-37"
+  "id": "libvirt-38"
 }
 
 {
   "return": [
   ],
-  "id": "libvirt-38"
+  "id": "libvirt-39"
 }
 
 {
   "return": [
     "emulator"
   ],
-  "id": "libvirt-39"
+  "id": "libvirt-40"
 }
 
 {
@@ -7547,7 +7562,7 @@
       "option": "drive"
     }
   ],
-  "id": "libvirt-40"
+  "id": "libvirt-41"
 }
 
 {
@@ -7609,7 +7624,7 @@
       "capability": "dirty-bitmaps"
     }
   ],
-  "id": "libvirt-41"
+  "id": "libvirt-42"
 }
 
 {
@@ -18977,11 +18992,11 @@
       "meta-type": "object"
     }
   ],
-  "id": "libvirt-42"
+  "id": "libvirt-43"
 }
 
 {
-  "id": "libvirt-43",
+  "id": "libvirt-44",
   "error": {
     "class": "GenericError",
     "desc": "The CPU definition 'max' is unknown."

tests/qemucapabilitiesdata/caps_2.12.0.s390x.xml

@@ -124,6 +124,8 @@
   <flag name='qom-list-properties'/>
   <flag name='memory-backend-file.discard-data'/>
   <flag name='virtual-css-bridge'/>
+  <flag name='virtual-css-bridge.cssid-unrestricted'/>
+  <flag name='vfio-ccw'/>
   <version>2011090</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>0</microcodeVersion>

tests/qemucapabilitiesdata/caps_2.7.0.s390x.replies

@@ -2547,6 +2547,16 @@
   "id": "libvirt-33"
 }
 
+{
+  "return": [
+    {
+      "name": "css_dev_path",
+      "type": "bool"
+    }
+  ],
+  "id": "libvirt-34"
+}
+
 {
   "return": [
     {
@@ -2577,7 +2587,7 @@
       "cpu-max": 248
     }
   ],
-  "id": "libvirt-34"
+  "id": "libvirt-35"
 }
 
 {
@@ -2586,19 +2596,19 @@
       "name": "host"
     }
   ],
-  "id": "libvirt-35"
+  "id": "libvirt-36"
 }
 
 {
   "return": [
   ],
-  "id": "libvirt-36"
+  "id": "libvirt-37"
 }
 
 {
   "return": [
   ],
-  "id": "libvirt-37"
+  "id": "libvirt-38"
 }
 
 {
@@ -3534,7 +3544,7 @@
       "option": "drive"
     }
   ],
-  "id": "libvirt-38"
+  "id": "libvirt-39"
 }
 
 {
@@ -3568,7 +3578,7 @@
       "capability": "postcopy-ram"
     }
   ],
-  "id": "libvirt-39"
+  "id": "libvirt-40"
 }
 
 {
@@ -11924,7 +11934,7 @@
       "meta-type": "object"
     }
   ],
-  "id": "libvirt-40"
+  "id": "libvirt-41"
 }
 
 {

tests/qemucapabilitiesdata/caps_2.7.0.s390x.xml

@@ -107,7 +107,7 @@
   <flag name='virtual-css-bridge'/>
   <version>2007000</version>
   <kvmVersion>0</kvmVersion>
-  <microcodeVersion>216732</microcodeVersion>
+  <microcodeVersion>216840</microcodeVersion>
   <package></package>
   <arch>s390x</arch>
   <cpu type='kvm' name='host'/>

tests/qemucapabilitiesdata/caps_2.8.0.s390x.replies

@@ -2820,6 +2820,16 @@
   "id": "libvirt-33"
 }
 
+{
+  "return": [
+    {
+      "name": "css_dev_path",
+      "type": "bool"
+    }
+  ],
+  "id": "libvirt-34"
+}
+
 {
   "return": [
     {
@@ -2855,7 +2865,7 @@
       "alias": "s390-ccw-virtio"
     }
   ],
-  "id": "libvirt-34"
+  "id": "libvirt-35"
 }
 
 {
@@ -3181,19 +3191,19 @@
       "migration-safe": true
     }
   ],
-  "id": "libvirt-35"
+  "id": "libvirt-36"
 }
 
 {
   "return": [
   ],
-  "id": "libvirt-36"
+  "id": "libvirt-37"
 }
 
 {
   "return": [
   ],
-  "id": "libvirt-37"
+  "id": "libvirt-38"
 }
 
 {
@@ -4154,7 +4164,7 @@
       "option": "drive"
     }
   ],
-  "id": "libvirt-38"
+  "id": "libvirt-39"
 }
 
 {
@@ -4192,7 +4202,7 @@
       "capability": "x-colo"
     }
   ],
-  "id": "libvirt-39"
+  "id": "libvirt-40"
 }
 
 {
@@ -12962,7 +12972,7 @@
       "meta-type": "object"
     }
   ],
-  "id": "libvirt-40"
+  "id": "libvirt-41"
 }
 
 {
@@ -12988,11 +12998,11 @@
       }
     }
   },
-  "id": "libvirt-41"
+  "id": "libvirt-42"
 }
 
 {
-  "id": "libvirt-42",
+  "id": "libvirt-43",
   "error": {
     "class": "GenericError",
     "desc": "Property '.migratable' not found"

tests/qemucapabilitiesdata/caps_2.8.0.s390x.xml

@@ -109,7 +109,7 @@
   <flag name='virtual-css-bridge'/>
   <version>2007093</version>
   <kvmVersion>0</kvmVersion>
-  <microcodeVersion>241633</microcodeVersion>
+  <microcodeVersion>241741</microcodeVersion>
   <package></package>
   <arch>s390x</arch>
   <hostCPU type='kvm' model='zEC12.2-base' migratability='no'>

tests/qemucapabilitiesdata/caps_2.9.0.s390x.replies

@@ -3101,6 +3101,16 @@
   "id": "libvirt-33"
 }
 
+{
+  "return": [
+    {
+      "name": "css_dev_path",
+      "type": "bool"
+    }
+  ],
+  "id": "libvirt-34"
+}
+
 {
   "return": [
     {
@@ -3141,7 +3151,7 @@
       "cpu-max": 248
     }
   ],
-  "id": "libvirt-34"
+  "id": "libvirt-35"
 }
 
 {
@@ -3531,19 +3541,19 @@
       "migration-safe": true
     }
   ],
-  "id": "libvirt-35"
+  "id": "libvirt-36"
 }
 
 {
   "return": [
   ],
-  "id": "libvirt-36"
+  "id": "libvirt-37"
 }
 
 {
   "return": [
   ],
-  "id": "libvirt-37"
+  "id": "libvirt-38"
 }
 
 {
@@ -4618,7 +4628,7 @@
       "option": "drive"
     }
   ],
-  "id": "libvirt-38"
+  "id": "libvirt-39"
 }
 
 {
@@ -4660,7 +4670,7 @@
       "capability": "release-ram"
     }
   ],
-  "id": "libvirt-39"
+  "id": "libvirt-40"
 }
 
 {
@@ -13946,7 +13956,7 @@
       "meta-type": "object"
     }
   ],
-  "id": "libvirt-40"
+  "id": "libvirt-41"
 }
 
 {
@@ -13973,11 +13983,11 @@
       }
     }
   },
-  "id": "libvirt-41"
+  "id": "libvirt-42"
 }
 
 {
-  "id": "libvirt-42",
+  "id": "libvirt-43",
   "error": {
     "class": "GenericError",
     "desc": "Property '.migratable' not found"

tests/qemucapabilitiesdata/caps_2.9.0.s390x.xml

@@ -112,7 +112,7 @@
   <flag name='virtual-css-bridge'/>
   <version>2009000</version>
   <kvmVersion>0</kvmVersion>
-  <microcodeVersion>265051</microcodeVersion>
+  <microcodeVersion>265159</microcodeVersion>
   <package></package>
   <arch>s390x</arch>
   <hostCPU type='kvm' model='z13.2-base' migratability='no'>