From 1cdc9ecebd0bf22ea658b84c2466e2ea237f1897 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A1n=20Tomko?= <jtomko@redhat.com>
Date: Thu, 14 Sep 2017 09:13:20 +0200
Subject: [PATCH] qemu: report a nicer error when USB is disabled
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If the user tries to define a domain that has

  <controller type='usb' model='none'/>

and also some USB devices, we report an error:
  error: internal error: No free USB ports

Which is technically still correct for a domain with no USB ports.

Change it to:

USB is disabled for this domain, but USB devices are present in the domain XML

https://bugzilla.redhat.com/show_bug.cgi?id=1347550
Signed-off-by: Ján Tomko <jtomko@redhat.com>
---
 src/conf/domain_conf.c         | 2 +-
 src/conf/domain_conf.h         | 2 ++
 src/libvirt_private.syms       | 1 +
 src/qemu/qemu_domain_address.c | 7 +++++++
 4 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index a248d73de3..4b722fbfba 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -5225,7 +5225,7 @@ virDomainDiskDefValidate(const virDomainDiskDef *disk)
     return 0;
 }
 
-static bool
+bool
 virDomainDefHasUSB(const virDomainDef *def)
 {
     size_t i;
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index a04f96169c..5859c8f4b1 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -2700,6 +2700,8 @@ int virDomainDefPostParse(virDomainDefPtr def,
                           unsigned int parseFlags,
                           virDomainXMLOptionPtr xmlopt,
                           void *parseOpaque);
+bool
+virDomainDefHasUSB(const virDomainDef *def);
 
 int virDomainDeviceValidateAliasForHotplug(virDomainObjPtr vm,
                                            virDomainDeviceDefPtr dev,
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 8a62ea159e..3766e20d3b 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -276,6 +276,7 @@ virDomainDefGetVcpusTopology;
 virDomainDefHasDeviceAddress;
 virDomainDefHasMemballoon;
 virDomainDefHasMemoryHotplug;
+virDomainDefHasUSB;
 virDomainDefHasVcpusOffline;
 virDomainDefLifecycleActionAllowed;
 virDomainDefMaybeAddController;
diff --git a/src/qemu/qemu_domain_address.c b/src/qemu/qemu_domain_address.c
index 1d88ab47a8..3fcb36add4 100644
--- a/src/qemu/qemu_domain_address.c
+++ b/src/qemu/qemu_domain_address.c
@@ -2701,6 +2701,13 @@ qemuDomainUSBAddressAddHubs(virDomainDefPtr def)
                                               &data,
                                               false));
 
+    if (data.count && !virDomainDefHasUSB(def)) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                       _("USB is disabled for this domain, but USB devices "
+                         "are present in the domain XML"));
+        return -1;
+    }
+
     if (data.count > available_ports)
         hubs_needed = VIR_DIV_UP(data.count - available_ports + 1,
                                  VIR_DOMAIN_USB_HUB_PORTS - 1);