From bdc09433303e6240ee0dca47642f39c41dd3fd8a Mon Sep 17 00:00:00 2001
Message-Id: <bdc09433303e6240ee0dca47642f39c41dd3fd8a.1377873637.git.jdenemar@redhat.com>
From: Laine Stump <laine@laine.org>
Date: Tue, 6 Aug 2013 13:23:26 -0600
Subject: [PATCH] qemu: enable using implicit sata controller in q35 machines

This patch is part of the resolution to:

   https://bugzilla.redhat.com/show_bug.cgi?id=819968

q35 machines have an implicit ahci (sata) controller at 00:1F.2 which
has no "id" associated with it. For this reason, we can't refer to it
as "ahci0". Instead, we don't give an id on the commandline, which
qemu interprets as "use the first ahci controller". We then need to
specify the unit with "unit=%d" rather than adding it onto the bus
arg.
(cherry picked from commit 83718cfe230dc4178940571090909b26d7af28d2)
---
 src/qemu/qemu_command.c                         | 23 ++++++++++++++++++++---
 tests/qemuxml2argvdata/qemuxml2argv-q35.args    |  2 ++
 tests/qemuxml2argvdata/qemuxml2argv-q35.xml     |  5 +++++
 tests/qemuxml2argvtest.c                        |  2 +-
 tests/qemuxml2xmloutdata/qemuxml2xmlout-q35.xml |  5 +++++
 5 files changed, 33 insertions(+), 4 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index c7e7826..a8fce22 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -4211,9 +4211,26 @@ qemuBuildDriveDevStr(virDomainDefPtr def,
             virBufferAddLit(&opt, "ide-drive");
         }
 
-        virBufferAsprintf(&opt, ",bus=ahci%d.%d",
-                          disk->info.addr.drive.controller,
-                          disk->info.addr.drive.unit);
+        if (qemuDomainMachineIsQ35(def) &&
+            disk->info.addr.drive.controller == 0) {
+            /* Q35 machines have an implicit ahci (sata) controller at
+             * 00:1F.2 which has no "id" associated with it. For this
+             * reason, we can't refer to it as "ahci0". Instead, we
+             * don't give an id, which qemu interprets as "use the
+             * first ahci controller". We then need to specify the
+             * unit with "unit=%d" rather than adding it onto the bus
+             * arg.
+             */
+            virBufferAsprintf(&opt, ",unit=%d", disk->info.addr.drive.unit);
+        } else {
+            /* All other ahci controllers have been created by
+             * libvirt, so they *do* have an id, and we can identify
+             * them that way.
+             */
+            virBufferAsprintf(&opt, ",bus=ahci%d.%d",
+                              disk->info.addr.drive.controller,
+                              disk->info.addr.drive.unit);
+        }
         break;
     case VIR_DOMAIN_DISK_BUS_VIRTIO:
         if (disk->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_CCW) {
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-q35.args b/tests/qemuxml2argvdata/qemuxml2argv-q35.args
index 5ff4bc7..9e67be5 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-q35.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-q35.args
@@ -3,4 +3,6 @@ LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test \
 -monitor unix:/tmp/test-monitor,server,nowait -no-acpi -boot c \
 -device i82801b11-bridge,id=pci.1,bus=pcie.0,addr=0x2 \
 -device pci-bridge,chassis_nr=2,id=pci.2,bus=pci.1,addr=0x1 \
+-drive file=/dev/HostVG/QEMUGuest1,if=none,id=drive-sata0-0-0 \
+-device ide-drive,unit=0,drive=drive-sata0-0-0,id=sata0-0-0 \
 -vga qxl -global qxl.ram_size=67108864 -global qxl.vram_size=18874368
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-q35.xml b/tests/qemuxml2argvdata/qemuxml2argv-q35.xml
index 3541b14..edaf6cb 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-q35.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-q35.xml
@@ -14,6 +14,11 @@
   <on_crash>destroy</on_crash>
   <devices>
     <emulator>/usr/libexec/qemu-kvm</emulator>
+    <disk type='block' device='disk'>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='sda' bus='sata'/>
+      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+    </disk>
     <controller type='pci' index='0' model='pcie-root'/>
     <controller type='pci' index='1' model='dmi-to-pci-bridge'/>
     <controller type='pci' index='2' model='pci-bridge'/>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 0068d27..679124e 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -1001,7 +1001,7 @@ mymain(void)
     DO_TEST("q35",
             QEMU_CAPS_DEVICE, QEMU_CAPS_DEVICE_PCI_BRIDGE,
             QEMU_CAPS_DEVICE_DMI_TO_PCI_BRIDGE,
-            QEMU_CAPS_ICH9_AHCI,
+            QEMU_CAPS_DRIVE, QEMU_CAPS_ICH9_AHCI,
             QEMU_CAPS_VGA, QEMU_CAPS_DEVICE_VIDEO_PRIMARY,
             QEMU_CAPS_VGA, QEMU_CAPS_VGA_QXL, QEMU_CAPS_DEVICE_QXL);
 
diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-q35.xml b/tests/qemuxml2xmloutdata/qemuxml2xmlout-q35.xml
index 2a86e61..96f8eaf 100644
--- a/tests/qemuxml2xmloutdata/qemuxml2xmlout-q35.xml
+++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-q35.xml
@@ -14,6 +14,11 @@
   <on_crash>destroy</on_crash>
   <devices>
     <emulator>/usr/libexec/qemu-kvm</emulator>
+    <disk type='block' device='disk'>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='sda' bus='sata'/>
+      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+    </disk>
     <controller type='pci' index='0' model='pcie-root'/>
     <controller type='pci' index='1' model='dmi-to-pci-bridge'/>
     <controller type='pci' index='2' model='pci-bridge'/>
-- 
1.8.3.2