[v8 5/6] add hostdev pci backend type for xen

[Chunyan Liu <cyliu@xxxxxxxx>]

Add VIR_DOMAIN_HOSTDEV_PCI_BACKEND_XEN. For legacy xen, it will use "pciback" as
stub driver.

Signed-off-by: Chunyan Liu <cyliu@xxxxxxxx>
---
 docs/schemas/domaincommon.rng |    1 +
 src/conf/domain_conf.c        |    3 ++-
 src/conf/domain_conf.h        |    1 +
 src/libxl/libxl_domain.c      |    9 +++++++++
 src/qemu/qemu_command.c       |    3 +--
 src/qemu/qemu_hotplug.c       |    4 +---
 src/util/virhostdev.c         |   12 ++++++++++++
 7 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index be32c6b..ebbeaca 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -3318,6 +3318,7 @@
             <choice>
               <value>kvm</value>
               <value>vfio</value>
+              <value>xen</value>
             </choice>
           </attribute>
           <empty/>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 0079234..9475b25 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -617,7 +617,8 @@ VIR_ENUM_IMPL(virDomainHostdevSubsysPciBackend,
               VIR_DOMAIN_HOSTDEV_PCI_BACKEND_TYPE_LAST,
               "default",
               "kvm",
-              "vfio")
+              "vfio",
+              "xen")
 
 VIR_ENUM_IMPL(virDomainHostdevCaps, VIR_DOMAIN_HOSTDEV_CAPS_TYPE_LAST,
               "storage",
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 647d115..5068b09 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -414,6 +414,7 @@ typedef enum {
     VIR_DOMAIN_HOSTDEV_PCI_BACKEND_DEFAULT, /* detect automaticaly, prefer VFIO */
     VIR_DOMAIN_HOSTDEV_PCI_BACKEND_KVM,    /* force legacy kvm style */
     VIR_DOMAIN_HOSTDEV_PCI_BACKEND_VFIO,   /* force vfio */
+    VIR_DOMAIN_HOSTDEV_PCI_BACKEND_XEN,    /* force legacy xen style, use pciback */
 
     VIR_DOMAIN_HOSTDEV_PCI_BACKEND_TYPE_LAST
 } virDomainHostdevSubsysPciBackendType;
diff --git a/src/libxl/libxl_domain.c b/src/libxl/libxl_domain.c
index 68009db..32e798b 100644
--- a/src/libxl/libxl_domain.c
+++ b/src/libxl/libxl_domain.c
@@ -393,6 +393,15 @@ libxlDomainDeviceDefPostParse(virDomainDeviceDefPtr dev,
         STRNEQ(def->os.type, "hvm"))
         dev->data.chr->targetType = VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_XEN;
 
+    if (dev->type == VIR_DOMAIN_DEVICE_HOSTDEV) {
+        virDomainHostdevDefPtr hostdev = dev->data.hostdev;
+
+        if (hostdev->mode == VIR_DOMAIN_HOSTDEV_MODE_SUBSYS &&
+            hostdev->source.subsys.type == VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI &&
+            hostdev->source.subsys.u.pci.backend == VIR_DOMAIN_HOSTDEV_PCI_BACKEND_DEFAULT)
+            hostdev->source.subsys.u.pci.backend = VIR_DOMAIN_HOSTDEV_PCI_BACKEND_XEN;
+    }
+
     return 0;
 }
 
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index d50c9aa..6802376 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -5538,8 +5538,7 @@ qemuBuildPCIHostdevDevStr(virDomainDefPtr def,
         virBufferAddLit(&buf, "vfio-pci");
         break;
 
-    case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_DEFAULT:
-    case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_TYPE_LAST:
+    default:
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("invalid PCI passthrough type '%s'"),
                        virDomainHostdevSubsysPciBackendTypeToString(backend));
diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index 9ea95b7..3d15d9f 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -1193,9 +1193,7 @@ qemuDomainAttachHostPciDevice(virQEMUDriverPtr driver,
 
         break;
 
-    case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_DEFAULT:
-    case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_KVM:
-    case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_TYPE_LAST:
+    default:
         break;
     }
 
diff --git a/src/util/virhostdev.c b/src/util/virhostdev.c
index 63690b7..1b0354f 100644
--- a/src/util/virhostdev.c
+++ b/src/util/virhostdev.c
@@ -373,6 +373,13 @@ virHostdevGetPciHostDeviceList(virDomainHostdevDefPtr *hostdevs, int nhostdevs)
             }
             break;
 
+        case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_XEN :
+            if (virPCIDeviceSetStubDriver(dev, "pciback") < 0) {
+                virObjectUnref(list);
+                return NULL;
+            }
+            break;
+
         case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_KVM :
         case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_DEFAULT:
             if (virPCIDeviceSetStubDriver(dev, "pci-stub") < 0) {
@@ -1191,6 +1198,11 @@ virHostdevUpdateActivePciHostdevs(virHostdevManagerPtr mgr,
                 goto cleanup;
             break;
 
+        case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_XEN :
+            if (virPCIDeviceSetStubDriver(dev, "pciback") < 0)
+                goto cleanup;
+            break;
+
         case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_KVM :
         case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_DEFAULT:
             if (virPCIDeviceSetStubDriver(dev, "pci-stub") < 0)
-- 
1.6.0.2

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