qemu: Support vram for video of qxl type

For qemu names the primary vga as "qxl-vga":

  1) if vram is specified for 2nd qxl device:

    -vga qxl -global qxl-vga.vram_size=$SIZE \
    -device qxl,id=video1,vram_size=$SIZE,...

  2) if vram is not specified for 2nd qxl device, (use the default
     set by global):

    -vga qxl -global qxl-vga.vram_size=$SIZE \
    -device qxl,id=video1,...

For qemu names all qxl devices as "qxl":

  1) if vram is specified for 2nd qxl device:

    -vga qxl -global qxl.vram_size=$SIZE \
    -device qxl,id=video1,vram_size=$SIZE ...

  2) if vram is not specified for 2nd qxl device:

    -vga qxl -global qxl-vga.vram_size=$SIZE \
    -device qxl,id=video1,...

"-global" is the only way to define vram_size for the primary qxl
device, regardless of how qemu names it, (It's not good a good
way, as original idea of "-global" is to set a global default for
a driver property, but to specify vram for first qxl device, we
have to use it).

For other qxl devices, as they are represented by "-device", could
specify it directly and seperately for each, and it overrides the
default set by "-global" if specified.

v1 - v2:
  * modify "virDomainVideoDefaultRAM" so that it returns 16M as the
    default vram_size for qxl device.

  * vram_size * 1024 (qemu accepts bytes for vram_size).

  * apply default vram_size for qxl device for which vram_size is
    not specified.

  * modify "graphics-spice" tests (more sensiable vram_size)

  * Add an argument of virDomainDefPtr type for qemuBuildVideoDevStr,
    to use virDomainVideoDefaultRAM in qemuBuildVideoDevStr).

v2 - v3:
  * Modify default video memory size for qxl device from 16M to 24M

  * Update codes to be consistent with changes on qemu_capabilities.*

src/conf/domain_conf.c

@@ -4167,6 +4167,10 @@ virDomainVideoDefaultRAM(virDomainDefPtr def,
         /* Original Xen PVFB hardcoded to 4 MB */
         return 4 * 1024;
 
+    case VIR_DOMAIN_VIDEO_TYPE_QXL:
+        /* QEMU use 64M as the minimal video video memory for qxl device */
+        return 64 * 1024;
+
     default:
         return 0;
     }

src/qemu/qemu_capabilities.c

@@ -1122,6 +1122,8 @@ qemuCapsParseDeviceStr(const char *str, virBitmapPtr flags)
     }
     if (strstr(str, "virtio-net-pci.tx="))
         qemuCapsSet(flags, QEMU_CAPS_VIRTIO_TX_ALG);
+    if (strstr(str, "name \"qxl-vga\""))
+        qemuCapsSet(flags, QEMU_CAPS_DEVICE_QXL_VGA);
 
     return 0;
 }

src/qemu/qemu_capabilities.h

@@ -94,6 +94,7 @@ enum qemuCapsFlags {
     QEMU_CAPS_CHARDEV_SPICEVMC  = 56, /* newer -chardev spicevmc */
     QEMU_CAPS_DEVICE_SPICEVMC   = 57, /* older -device spicevmc*/
     QEMU_CAPS_VIRTIO_TX_ALG     = 58, /* -device virtio-net-pci,tx=string */
+    QEMU_CAPS_DEVICE_QXL_VGA    = 59, /* Is the primary and vga campatible qxl device named qxl-vga? */
 
     QEMU_CAPS_LAST,                   /* this must always be the last item */
 };

src/qemu/qemu_command.c

@@ -1931,6 +1931,12 @@ qemuBuildVideoDevStr(virDomainVideoDefPtr video,
 
     virBufferVSprintf(&buf, "%s", model);
     virBufferVSprintf(&buf, ",id=%s", video->info.alias);
+
+    if (video->type == VIR_DOMAIN_VIDEO_TYPE_QXL) {
+        /* QEMU accepts bytes for vram_size. */
+        virBufferVSprintf(&buf, ",vram_size=%u", video->vram * 1024);
+    }
+
     if (qemuBuildDeviceAddressStr(&buf, &video->info, qemuCaps) < 0)
         goto error;
 
@@ -4033,6 +4039,18 @@ qemuBuildCommandLine(virConnectPtr conn,
                 }
 
                 virCommandAddArgList(cmd, "-vga", vgastr, NULL);
+
+                if (def->videos[0]->type == VIR_DOMAIN_VIDEO_TYPE_QXL) {
+                    if (def->videos[0]->vram &&
+                        qemuCapsGet(qemuCaps, QEMU_CAPS_DEVICE)) {
+                            if (qemuCapsGet(qemuCaps, QEMU_CAPS_DEVICE_QXL_VGA))
+                                virCommandAddArgFormat(cmd, "-global qxl-vga.vram_size=%u",
+                                                       def->videos[0]->vram * 1024);
+                            else
+                                virCommandAddArgFormat(cmd, "-global qxl.vram_size=%u",
+                                                       def->videos[0]->vram * 1024);
+                    }
+                }
             }
         } else {
 

tests/qemuhelptest.c

@@ -489,6 +489,7 @@ mymain(int argc, char **argv)
             QEMU_CAPS_DRIVE_AIO,
             QEMU_CAPS_CCID_PASSTHRU,
             QEMU_CAPS_CHARDEV_SPICEVMC,
+            QEMU_CAPS_DEVICE_QXL_VGA,
             QEMU_CAPS_VIRTIO_TX_ALG);
 
     return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;

tests/qemuxml2argvdata/qemuxml2argv-graphics-spice-qxl-vga.args

+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=spice \
+/usr/bin/qemu -S -M pc -m 214 -smp 1 -nodefaults -monitor \
+unix:/tmp/test-monitor,server,nowait -no-acpi -boot c -hda \
+/dev/HostVG/QEMUGuest1 -usb -spice port=5903,tls-port=5904,addr=127.0.0.1,\
+x509-dir=/etc/pki/libvirt-spice,tls-channel=main,plaintext-channel=inputs -vga \
+qxl -global qxl-vga.vram_size=33554432 -device qxl,id=video1,vram_size=67108864,bus=pci.0,addr=0x4 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3

tests/qemuxml2argvdata/qemuxml2argv-graphics-spice-qxl-vga.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory>219136</memory>
+  <currentMemory>219136</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'/>
+      <address type='drive' controller='0' bus='0' unit='0'/>
+    </disk>
+    <controller type='ide' index='0'/>
+    <input type='mouse' bus='ps2'/>
+    <graphics type='spice' port='5903' tlsPort='5904' autoport='no' listen='127.0.0.1'>
+      <channel name='main' mode='secure'/>
+      <channel name='inputs' mode='insecure'/>
+    </graphics>
+    <video>
+      <model type='qxl' vram='32768' heads='1'/>
+    </video>
+    <video>
+      <model type='qxl' vram='65536' heads='1'/>
+    </video>
+    <memballoon model='virtio'/>
+  </devices>
+</domain>

tests/qemuxml2argvdata/qemuxml2argv-graphics-spice.args

@@ -3,5 +3,5 @@ LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=spice \
 unix:/tmp/test-monitor,server,nowait -no-acpi -boot c -hda \
 /dev/HostVG/QEMUGuest1 -usb -spice port=5903,tls-port=5904,addr=127.0.0.1,\
 x509-dir=/etc/pki/libvirt-spice,tls-channel=main,plaintext-channel=inputs -vga \
-qxl -device qxl,id=video1,bus=pci.0,addr=0x4 -device virtio-balloon-pci,\
-id=balloon0,bus=pci.0,addr=0x3
+qxl -global qxl.vram_size=18874368 -device qxl,id=video1,vram_size=33554432,bus=pci.0,addr=0x4 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3

tests/qemuxml2argvdata/qemuxml2argv-graphics-spice.xml

@@ -26,10 +26,10 @@
       <channel name='inputs' mode='insecure'/>
     </graphics>
     <video>
-      <model type='qxl' vram='65536' heads='1'/>
+      <model type='qxl' vram='18432' heads='1'/>
     </video>
     <video>
-      <model type='qxl' vram='65536' heads='1'/>
+      <model type='qxl' vram='32768' heads='1'/>
     </video>
     <memballoon model='virtio'/>
   </devices>

tests/qemuxml2argvtest.c

@@ -357,6 +357,10 @@ mymain(int argc, char **argv)
     DO_TEST("graphics-spice", false,
             QEMU_CAPS_VGA, QEMU_CAPS_VGA_QXL,
             QEMU_CAPS_DEVICE, QEMU_CAPS_SPICE);
+    DO_TEST("graphics-spice-qxl-vga", false,
+            QEMU_CAPS_VGA, QEMU_CAPS_VGA_QXL,
+            QEMU_CAPS_DEVICE, QEMU_CAPS_SPICE,
+            QEMU_CAPS_DEVICE_QXL_VGA);
 
     DO_TEST("input-usbmouse", false, NONE);
     DO_TEST("input-usbtablet", false, NONE);

tests/qemuxml2xmltest.c

@@ -152,6 +152,7 @@ mymain(int argc, char **argv)
     DO_TEST("graphics-sdl");
     DO_TEST("graphics-sdl-fullscreen");
     DO_TEST("graphics-spice");
+    DO_TEST("graphics-spice-qxl-vga");
     DO_TEST("input-usbmouse");
     DO_TEST("input-usbtablet");
     DO_TEST("input-xen");