[PATCH] qemu: validate: Clarify error messages for unsupported 3d video acceleration

[Peter Krempa]

The error message doesn't really convey the information that 3d
acceleration works only for the 'virtio' model and similarly the same
error would be reported if qemu doesn't support acceleration, which is
hard to debug.

Split and clarify the errors.

Noticed in https://gitlab.com/libvirt/libvirt/-/issues/388

Signed-off-by: Peter Krempa <pkrempa at redhat.com>
---
 src/qemu/qemu_validate.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/src/qemu/qemu_validate.c b/src/qemu/qemu_validate.c
index cb4e32c0ff..079009ea4b 100644
--- a/src/qemu/qemu_validate.c
+++ b/src/qemu/qemu_validate.c
@@ -2765,15 +2765,20 @@ qemuValidateDomainDeviceDefVideo(const virDomainVideoDef *video,
             return -1;
         }
     } else if (video->accel) {
-        if (video->accel->accel3d == VIR_TRISTATE_BOOL_YES &&
-            (video->type != VIR_DOMAIN_VIDEO_TYPE_VIRTIO ||
-             !(virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_GPU_VIRGL) ||
-               virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_GPU_GL_PCI) ||
-               virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_VGA_GL)))) {
-            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
-                           _("%s 3d acceleration is not supported"),
-                           virDomainVideoTypeToString(video->type));
-            return -1;
+        if (video->accel->accel3d == VIR_TRISTATE_BOOL_YES) {
+            if (video->type != VIR_DOMAIN_VIDEO_TYPE_VIRTIO) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                               _("3d acceleration is supported only with 'virtio' video device"));
+                return -1;
+            }
+
+            if (!(virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_GPU_VIRGL) ||
+                  virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_GPU_GL_PCI) ||
+                  virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_VGA_GL))) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                               _("3d acceleration is not supported by this QEMU binary"));
+                return -1;
+            }
         }
     }

-- 
2.37.3