xenconfig: Add support for max_grant_frames

Add support in the domXML<->native config converter for
max_grant_frames. Include a test for the conversion.
Signed-off-by: NJim Fehlig <jfehlig@suse.com>
Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>

src/xenconfig/xen_xl.c

@@ -607,6 +607,34 @@ xenParseXLVnuma(virConfPtr conf,
 }
 #endif
 
+#ifdef LIBXL_HAVE_BUILDINFO_GRANT_LIMITS
+static int
+xenParseXLGntLimits(virConfPtr conf, virDomainDefPtr def)
+{
+    unsigned long max_gntframes;
+    int ctlr_idx;
+    virDomainControllerDefPtr xenbus_ctlr;
+
+    if (xenConfigGetULong(conf, "max_grant_frames", &max_gntframes, 0) < 0)
+        return -1;
+
+    if (max_gntframes <= 0)
+        return 0;
+
+    ctlr_idx = virDomainControllerFindByType(def, VIR_DOMAIN_CONTROLLER_TYPE_XENBUS);
+    if (ctlr_idx == -1)
+        xenbus_ctlr = virDomainDefAddController(def, VIR_DOMAIN_CONTROLLER_TYPE_XENBUS, -1, -1);
+    else
+        xenbus_ctlr = def->controllers[ctlr_idx];
+
+    if (xenbus_ctlr == NULL)
+        return -1;
+
+    xenbus_ctlr->opts.xenbusopts.maxGrantFrames = max_gntframes;
+    return 0;
+}
+#endif
+
 static int
 xenParseXLDiskSrc(virDomainDiskDefPtr disk, char *srcstr)
 {
@@ -1165,6 +1193,11 @@ xenParseXL(virConfPtr conf,
         goto cleanup;
 #endif
 
+#ifdef LIBXL_HAVE_BUILDINFO_GRANT_LIMITS
+    if (xenParseXLGntLimits(conf, def) < 0)
+        goto cleanup;
+#endif
+
     if (xenParseXLCPUID(conf, def) < 0)
         goto cleanup;
 
@@ -1517,6 +1550,24 @@ xenFormatXLDomainVnuma(virConfPtr conf,
 }
 #endif
 
+#ifdef LIBXL_HAVE_BUILDINFO_GRANT_LIMITS
+static int
+xenFormatXLGntLimits(virConfPtr conf, virDomainDefPtr def)
+{
+    size_t i;
+
+    for (i = 0; i < def->ncontrollers; i++) {
+        if (def->controllers[i]->type == VIR_DOMAIN_CONTROLLER_TYPE_XENBUS &&
+            def->controllers[i]->opts.xenbusopts.maxGrantFrames > 0) {
+            if (xenConfigSetInt(conf, "max_grant_frames",
+                                def->controllers[i]->opts.xenbusopts.maxGrantFrames) < 0)
+                return -1;
+        }
+    }
+    return 0;
+}
+#endif
+
 static char *
 xenFormatXLDiskSrcNet(virStorageSourcePtr src)
 {
@@ -2166,6 +2217,11 @@ xenFormatXL(virDomainDefPtr def, virConnectPtr conn)
         goto cleanup;
 #endif
 
+#ifdef LIBXL_HAVE_BUILDINFO_GRANT_LIMITS
+    if (xenFormatXLGntLimits(conf, def) < 0)
+        goto cleanup;
+#endif
+
     if (xenFormatXLDomainDisks(conf, def) < 0)
         goto cleanup;
 

tests/xlconfigdata/test-max-gntframes.cfg

+name = "XenGuest1"
+uuid = "45b60f51-88a9-47a8-a3b3-5e66d71b2283"
+maxmem = 512
+memory = 512
+vcpus = 1
+localtime = 0
+on_poweroff = "preserve"
+on_reboot = "restart"
+on_crash = "preserve"
+vif = [ "mac=5a:36:0e:be:00:09" ]
+bootloader = "/usr/bin/pygrub"
+max_grant_frames = 64
+disk = [ "format=qcow2,vdev=xvda,access=rw,backendtype=qdisk,target=/var/lib/xen/images/debian/disk.qcow2" ]

tests/xlconfigdata/test-max-gntframes.xml

+<domain type='xen'>
+  <name>XenGuest1</name>
+  <uuid>45b60f51-88a9-47a8-a3b3-5e66d71b2283</uuid>
+  <memory unit='KiB'>524288</memory>
+  <currentMemory unit='KiB'>524288</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <bootloader>/usr/bin/pygrub</bootloader>
+  <os>
+    <type arch='x86_64' machine='xenpv'>linux</type>
+  </os>
+  <clock offset='utc' adjustment='reset'/>
+  <on_poweroff>preserve</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>preserve</on_crash>
+  <devices>
+    <disk type='file' device='disk'>
+      <driver name='qemu' type='qcow2'/>
+      <source file='/var/lib/xen/images/debian/disk.qcow2'/>
+      <target dev='xvda' bus='xen'/>
+    </disk>
+    <controller type='xenbus' index='0' maxGrantFrames='64'/>
+    <interface type='ethernet'>
+      <mac address='5a:36:0e:be:00:09'/>
+    </interface>
+    <console type='pty'>
+      <target type='xen' port='0'/>
+    </console>
+    <input type='mouse' bus='xen'/>
+    <input type='keyboard' bus='xen'/>
+    <memballoon model='xen'/>
+  </devices>
+</domain>

tests/xlconfigtest.c

@@ -299,6 +299,10 @@ mymain(void)
     DO_TEST_FORMAT("fullvirt-direct-kernel-boot-extra", false);
     DO_TEST_FORMAT("fullvirt-direct-kernel-boot-bogus-extra", false);
 #endif
+#ifdef LIBXL_HAVE_BUILDINFO_GRANT_LIMITS
+    DO_TEST("max-gntframes");
+#endif
+
     DO_TEST("vif-typename");
     DO_TEST("vif-multi-ip");
     DO_TEST("usb");