qemu: make error messages device specific

Changing the error messages to report the problem encountered.
Reviewed-by: NJán Tomko <jtomko@redhat.com>
Reviewed-by: NMarc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: NBjoern Walk <bwalk@linux.ibm.com>
Signed-off-by: NBoris Fiuczynski <fiuczy@linux.ibm.com>
Signed-off-by: NJán Tomko <jtomko@redhat.com>

src/qemu/qemu_domain.c

@@ -5299,16 +5299,16 @@ qemuDomainDeviceDefValidateHostdev(const virDomainHostdevDef *hostdev,
         case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI_HOST:
             if (hostdev->info->bootIndex) {
                 virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
-                               _("booting from assigned devices is only "
-                                 "supported for PCI, USB and SCSI devices"));
+                               _("booting from assigned devices is not "
+                                 "supported by vhost SCSI devices"));
                 return -1;
             }
             break;
         case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_MDEV:
             if (hostdev->info->bootIndex) {
                 virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
-                               _("booting from assigned devices is only "
-                                 "supported for PCI, USB and SCSI devices"));
+                               _("booting from assigned devices is not "
+                                 "supported by mediated devices"));
                 return -1;
             }
             mdevsrc = &hostdev->source.subsys.u.mdev;