[libvirt] [PATCH v2 2/4] qemu: Add support for iothreads
John Ferlan
jferlan at redhat.com
Tue Aug 26 22:15:47 UTC 2014
Add a new capability to ensure the iothreads feature exists for the qemu
emulator being run - requires the "query-iothreads" QMP command. Using the
domain XML add correspoding command argument in order to generate the
threads. The iothreads will use a name space "iothread#" where, the
future patch to add support for using an iothread to a disk definition to
merely define which of the available threads to use.
Add tests to ensure the xml/argv processing is correct. Note that no
change was made to qemuargv2xmltest.c as processing the -object element
would require knowing more than just iothreads.
Signed-off-by: John Ferlan <jferlan at redhat.com>
---
src/qemu/qemu_capabilities.c | 2 ++
src/qemu/qemu_capabilities.h | 1 +
src/qemu/qemu_command.c | 13 ++++++++++
tests/qemuxml2argvdata/qemuxml2argv-iothreads.args | 8 ++++++
tests/qemuxml2argvdata/qemuxml2argv-iothreads.xml | 29 ++++++++++++++++++++++
tests/qemuxml2argvtest.c | 2 ++
tests/qemuxml2xmltest.c | 1 +
7 files changed, 56 insertions(+)
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-iothreads.args
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-iothreads.xml
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 410086b..70c28e0 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -268,6 +268,7 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
"rtc-reset-reinjection",
"splash-timeout", /* 175 */
+ "iothread",
);
@@ -1491,6 +1492,7 @@ struct virQEMUCapsStringFlags virQEMUCapsObjectTypes[] = {
{ "memory-backend-ram", QEMU_CAPS_OBJECT_MEMORY_RAM },
{ "memory-backend-file", QEMU_CAPS_OBJECT_MEMORY_FILE },
{ "usb-audio", QEMU_CAPS_OBJECT_USB_AUDIO },
+ { "iothread", QEMU_CAPS_OBJECT_IOTHREAD},
};
static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsVirtioBlk[] = {
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 48a4eaa..0980c00 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -215,6 +215,7 @@ typedef enum {
QEMU_CAPS_OBJECT_USB_AUDIO = 173, /* usb-audio device support */
QEMU_CAPS_RTC_RESET_REINJECTION = 174, /* rtc-reset-reinjection monitor command */
QEMU_CAPS_SPLASH_TIMEOUT = 175, /* -boot splash-time */
+ QEMU_CAPS_OBJECT_IOTHREAD = 176, /* -object iothread */
QEMU_CAPS_LAST, /* this must always be the last item */
} virQEMUCapsFlags;
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 9241f57..ba0b977 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -7541,6 +7541,19 @@ qemuBuildCommandLine(virConnectPtr conn,
virCommandAddArg(cmd, smp);
VIR_FREE(smp);
+ if (def->iothreads > 0 &&
+ virQEMUCapsGet(qemuCaps, QEMU_CAPS_OBJECT_IOTHREAD)) {
+ /* Create named iothread objects starting with 1. These may be used
+ * by a disk definition which will associate to an iothread by
+ * supplying a value of 1 up to the number of iothreads available
+ * (since 0 would indicate to not use the feature).
+ */
+ for (i = 1; i <= def->iothreads; i++) {
+ virCommandAddArg(cmd, "-object");
+ virCommandAddArgFormat(cmd, "iothread,id=iothread%zu", i);
+ }
+ }
+
if (def->cpu && def->cpu->ncells)
if (qemuBuildNumaArgStr(cfg, def, cmd, qemuCaps) < 0)
goto error;
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-iothreads.args b/tests/qemuxml2argvdata/qemuxml2argv-iothreads.args
new file mode 100644
index 0000000..4ef34cf
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-iothreads.args
@@ -0,0 +1,8 @@
+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=none \
+/usr/bin/qemu -S -M \
+pc -m 214 -smp 2 \
+-object iothread,id=iothread1 \
+-object iothread,id=iothread2 \
+-nographic -monitor \
+unix:/tmp/test-monitor,server,nowait -no-acpi -boot c -usb -hda \
+/dev/HostVG/QEMUGuest1 -net none -serial none -parallel none
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-iothreads.xml b/tests/qemuxml2argvdata/qemuxml2argv-iothreads.xml
new file mode 100644
index 0000000..12a92e7
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-iothreads.xml
@@ -0,0 +1,29 @@
+<domain type='qemu'>
+ <name>QEMUGuest1</name>
+ <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+ <memory unit='KiB'>219136</memory>
+ <currentMemory unit='KiB'>219136</currentMemory>
+ <vcpu placement='static'>2</vcpu>
+ <iothreads>2</iothreads>
+ <os>
+ <type arch='i686' machine='pc'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/bin/qemu</emulator>
+ <disk type='block' device='disk'>
+ <driver name='qemu' type='raw'/>
+ <source dev='/dev/HostVG/QEMUGuest1'/>
+ <target dev='hda' bus='ide'/>
+ <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+ </disk>
+ <controller type='usb' index='0'/>
+ <controller type='ide' index='0'/>
+ <controller type='pci' index='0' model='pci-root'/>
+ <memballoon model='none'/>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 1a8201a..64a4d3d 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -1185,6 +1185,8 @@ mymain(void)
DO_TEST("smp", QEMU_CAPS_SMP_TOPOLOGY);
+ DO_TEST("iothreads", QEMU_CAPS_OBJECT_IOTHREAD);
+
DO_TEST("cpu-topology1", QEMU_CAPS_SMP_TOPOLOGY);
DO_TEST("cpu-topology2", QEMU_CAPS_SMP_TOPOLOGY);
DO_TEST("cpu-topology3", NONE);
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index b2d2eed..796977b 100644
--- a/tests/qemuxml2xmltest.c
+++ b/tests/qemuxml2xmltest.c
@@ -301,6 +301,7 @@ mymain(void)
DO_TEST("cputune-zero-shares");
DO_TEST("smp");
+ DO_TEST("iothreads");
DO_TEST("lease");
DO_TEST("event_idx");
DO_TEST("vhost_queues");
--
1.9.3
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