From 60d285eca3ab7003a7ebd03e3610616e0a657942 Mon Sep 17 00:00:00 2001
Message-Id: <60d285eca3ab7003a7ebd03e3610616e0a657942@dist-git>
From: Michal Privoznik <mprivozn@redhat.com>
Date: Mon, 20 Nov 2017 11:08:51 +0100
Subject: [PATCH] qemuBuildDriveDevStr: Prefer default aliases for IDE bus

https://bugzilla.redhat.com/show_bug.cgi?id=1434451

When testing user aliases it was discovered that for 440fx
machine type which has default IDE bus builtin, domain cannot
start if IDE controller has the user provided alias. This is
because for 440fx we don't put the IDE controller onto the
command line (since it is builtin) and therefore any device that
is plugged onto the bus must use the default alias.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
(cherry picked from commit 9324f67a572f9b32f25bc088fb9f34e736edc612)
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
---
 src/qemu/qemu_command.c                               | 14 +++++++++++---
 tests/qemuxml2argvdata/qemuxml2argv-user-aliases.args |  4 ++--
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index aa7079229f..272ef610a3 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -1947,9 +1947,17 @@ qemuBuildDriveDevStr(const virDomainDef *def,
             virBufferAddLit(&opt, "ide-drive");
         }
 
-        if (!(contAlias = virDomainControllerAliasFind(def, VIR_DOMAIN_CONTROLLER_TYPE_IDE,
-                                                       disk->info.addr.drive.controller)))
-           goto error;
+        /* When domain has builtin IDE controller we don't put it onto cmd
+         * line. Therefore we can't set its alias. In that case, use the
+         * default one. */
+        if (qemuDomainHasBuiltinIDE(def)) {
+            contAlias = "ide";
+        } else {
+            if (!(contAlias = virDomainControllerAliasFind(def,
+                                                           VIR_DOMAIN_CONTROLLER_TYPE_IDE,
+                                                           disk->info.addr.drive.controller)))
+                goto error;
+        }
         virBufferAsprintf(&opt, ",bus=%s.%d,unit=%d",
                           contAlias,
                           disk->info.addr.drive.bus,
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-user-aliases.args b/tests/qemuxml2argvdata/qemuxml2argv-user-aliases.args
index 62fbd567b1..1719c1bc88 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-user-aliases.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-user-aliases.args
@@ -44,8 +44,8 @@ id=drive-ua-myEncryptedDisk1 \
 id=ua-myEncryptedDisk1 \
 -drive file=/home/zippy/tmp/install-amd64-minimal-20140619.iso,format=raw,\
 if=none,media=cdrom,id=drive-ua-WhatAnAwesomeCDROM,readonly=on,cache=none \
--device ide-drive,bus=ua-DoesAnybodyStillUseIDE.1,unit=0,\
-drive=drive-ua-WhatAnAwesomeCDROM,id=ua-WhatAnAwesomeCDROM \
+-device ide-drive,bus=ide.1,unit=0,drive=drive-ua-WhatAnAwesomeCDROM,\
+id=ua-WhatAnAwesomeCDROM \
 -device virtio-net-pci,vlan=0,id=ua-CheckoutThisNIC,mac=52:54:00:d6:c0:0b,\
 bus=pci.0,addr=0x3 \
 -net tap,fd=3,vlan=0,name=hostua-CheckoutThisNIC \
-- 
2.15.0