Support paravirt disk configuration for xenner guests

ChangeLog

+Thu May 15 11:57:08 EST 2008 Daniel P. Berrange <berrange@redhat.com>
+
+	Support paravirt disk configuration for xenner guests
+	* src/qemu_conf.c, src/qemu_conf.h: Add support for 'xen' disk
+	bus and 'xvd' disk device names for Xenner
+	* src/util.c: Support parsing 'xvd' disk names
+	* tests/qemuxml2argv-disk-xenvbd.{args,xml}: Test case data
+	files for xvd disks.
+	* tests/qemuxml2argvtest.c, tests/qemuxml2xmltest.c: Add
+	test case for xvd disk / xen bus type
+
 Thu May 15 09:12:08 CEST 2008 Jim Meyering <meyering@redhat.com>
 
 	Avoid using STREQLEN with a literal; use STRPREFIX instead

src/qemu_conf.c

@@ -667,7 +667,8 @@ static int qemudParseDiskXML(virConnectPtr conn,
     if ((!device || STREQ((const char *)device, "disk")) &&
         !STRPREFIX((const char *)target, "hd") &&
         !STRPREFIX((const char *)target, "sd") &&
-        !STRPREFIX((const char *)target, "vd")) {
+        !STRPREFIX((const char *)target, "vd") &&
+        !STRPREFIX((const char *)target, "xvd")) {
         qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
                          _("Invalid harddisk device name: %s"), target);
         goto error;
@@ -707,6 +708,8 @@ static int qemudParseDiskXML(virConnectPtr conn,
         disk->bus = QEMUD_DISK_BUS_SCSI;
     else if (STREQ((const char *)bus, "virtio"))
         disk->bus = QEMUD_DISK_BUS_VIRTIO;
+    else if (STREQ((const char *)bus, "xen"))
+        disk->bus = QEMUD_DISK_BUS_XEN;
     else {
         qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
                          _("Invalid bus type: %s"), bus);
@@ -1435,7 +1438,8 @@ static const char *qemudBusIdToName(int busId, int qemuIF) {
     const char *busnames[] = { "ide",
                                (qemuIF ? "floppy" : "fdc"),
                                "scsi",
-                               "virtio" };
+                               "virtio",
+                               "xen"};
     verify_true(ARRAY_CARDINALITY(busnames) == QEMUD_DISK_BUS_LAST);
 
     return busnames[busId];

src/qemu_conf.h

@@ -61,6 +61,7 @@ enum qemud_vm_disk_bus {
     QEMUD_DISK_BUS_FDC,
     QEMUD_DISK_BUS_SCSI,
     QEMUD_DISK_BUS_VIRTIO,
+    QEMUD_DISK_BUS_XEN,
 
     QEMUD_DISK_BUS_LAST
 };

src/util.c

@@ -778,25 +778,19 @@ virParseMacAddr(const char* str, unsigned char *addr)
 int virDiskNameToIndex(const char *name) {
     const char *ptr = NULL;
     int idx = 0;
+    static char const* const drive_prefix[] = {"fd", "hd", "vd", "sd", "xvd"};
+    unsigned int i;
 
-    if (strlen(name) < 3)
-        return -1;
-
-    switch (*name) {
-        case 'f':
-        case 'h':
-        case 'v':
-        case 's':
+    for (i = 0; i < ARRAY_CARDINALITY(drive_prefix); i++) {
+        if (STRPREFIX(name, drive_prefix[i])) {
+            ptr = name + strlen(drive_prefix[i]);
             break;
-        default:
-            return 0;
+        }
     }
 
-    if (*(name + 1) != 'd')
+    if (!ptr)
         return -1;
 
-    ptr = name+2;
-
     while (*ptr) {
         idx = idx * 26;
 

tests/qemuxml2argvdata/qemuxml2argv-disk-xenvbd.args

+/usr/bin/qemu -M pc -m 214 -smp 1 -nographic -monitor pty -no-acpi -boot c -drive file=/dev/HostVG/QEMUGuest1,if=ide,index=0,boot=on -drive file=/dev/HostVG/QEMUGuest2,if=ide,media=cdrom,index=2 -drive file=/tmp/data.img,if=xen,index=0 -drive file=/tmp/logs.img,if=xen,index=6 -net none -serial none -parallel none -usb
\ No newline at end of file

tests/qemuxml2argvdata/qemuxml2argv-disk-xenvbd.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory>219200</memory>
+  <currentMemory>219200</currentMemory>
+  <vcpu>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <disk type='block' device='disk'>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+    </disk>
+    <disk type='block' device='cdrom'>
+      <source dev='/dev/HostVG/QEMUGuest2'/>
+      <target dev='hdc' bus='ide'/>
+      <readonly/>
+    </disk>
+    <disk type='file' device='disk'>
+      <source file='/tmp/data.img'/>
+      <target dev='xvda' bus='xen'/>
+    </disk>
+    <disk type='file' device='disk'>
+      <source file='/tmp/logs.img'/>
+      <target dev='xvdg' bus='xen'/>
+    </disk>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -153,6 +153,7 @@ main(int argc, char **argv)
     DO_TEST("disk-floppy", 0);
     DO_TEST("disk-many", 0);
     DO_TEST("disk-virtio", 1);
+    DO_TEST("disk-xenvbd", 1);
     DO_TEST("graphics-vnc", 0);
     DO_TEST("graphics-sdl", 0);
     DO_TEST("input-usbmouse", 0);

tests/qemuxml2xmltest.c

@@ -102,6 +102,7 @@ main(int argc, char **argv)
     DO_TEST("disk-cdrom");
     DO_TEST("disk-floppy");
     DO_TEST("disk-many");
+    DO_TEST("disk-xenvbd");
     DO_TEST("graphics-vnc");
     DO_TEST("graphics-sdl");
     DO_TEST("input-usbmouse");