[libvirt] [PATCH 2/2] qemu: Support multiqueue virtio-blk
Lin Ma
lma at suse.com
Fri Sep 29 13:54:23 UTC 2017
qemu 2.7.0 introduces multiqueue virtio-blk(commit 2f27059).
This patch introduces a new attribute "queues". An example of
the XML:
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' queues='4'/>
The corresponding QEMU command line:
-device virtio-blk-pci,scsi=off,num-queues=4,id=virtio-disk0
Signed-off-by: Lin Ma <lma at suse.com>
---
docs/formatdomain.html.in | 6 +++-
docs/schemas/domaincommon.rng | 5 ++++
src/conf/domain_conf.c | 19 ++++++++++++
src/conf/domain_conf.h | 1 +
src/qemu/qemu_capabilities.c | 2 ++
src/qemu/qemu_capabilities.h | 1 +
src/qemu/qemu_command.c | 4 +++
.../qemuxml2argv-disk-virtio-drive-queues.args | 24 +++++++++++++++
.../qemuxml2argv-disk-virtio-drive-queues.xml | 34 ++++++++++++++++++++++
tests/qemuxml2argvtest.c | 2 ++
.../qemuxml2xmlout-disk-virtio-drive-queues.xml | 1 +
tests/qemuxml2xmltest.c | 1 +
12 files changed, 99 insertions(+), 1 deletion(-)
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-virtio-drive-queues.args
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-virtio-drive-queues.xml
create mode 120000 tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-virtio-drive-queues.xml
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 5bdcb569c..2b4eac1f8 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -2393,7 +2393,7 @@
<target dev='vdc' bus='virtio'/>
</disk>
<disk type='file' device='disk'>
- <driver name='qemu' type='qcow2'/>
+ <driver name='qemu' type='qcow2' queues='4'/>
<source file='/var/lib/libvirt/images/domain.qcow'/>
<backingStore type='file'>
<format type='qcow2'/>
@@ -3053,6 +3053,10 @@
<code>bus</code> and "pci" or "ccw" <code>address</code> types.
<span class='since'>Since 1.2.8 (QEMU 2.1)</span>
</li>
+ <li>
+ The optional <code>queues</code> attribute specifies the number of
+ virt queues for virtio-blk. (<span class="since">Since 3.8.0</span>)
+ </li>
<li>
For virtio disks,
<a href="#elementsVirtio">Virtio-specific options</a> can also be
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index bac371ea3..66b3d70c6 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -1811,6 +1811,11 @@
<optional>
<ref name="detect_zeroes"/>
</optional>
+ <optional>
+ <attribute name='queues'>
+ <ref name="positiveInteger"/>
+ </attribute>
+ </optional>
<ref name="virtioOptions"/>
<empty/>
</element>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 87192eb2d..90572d51a 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -8761,6 +8761,15 @@ virDomainDiskDefDriverParseXML(virDomainDiskDefPtr def,
}
VIR_FREE(tmp);
+ if ((tmp = virXMLPropString(cur, "queues")) &&
+ virStrToLong_ui(tmp, NULL, 10, &def->queues) < 0) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("'queues' attribute must be positive number: %s"),
+ tmp);
+ goto cleanup;
+ }
+ VIR_FREE(tmp);
+
ret = 0;
cleanup:
@@ -21996,6 +22005,16 @@ virDomainDiskDefFormat(virBufferPtr buf,
virBufferAsprintf(&driverBuf, " iothread='%u'", def->iothread);
if (def->detect_zeroes)
virBufferAsprintf(&driverBuf, " detect_zeroes='%s'", detect_zeroes);
+ if (def->queues) {
+ if (def->bus == VIR_DOMAIN_DISK_BUS_VIRTIO)
+ virBufferAsprintf(&driverBuf, " queues='%u'", def->queues);
+ else {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("queues attribute in disk driver element is only "
+ "supported by virtio-blk"));
+ return -1;
+ }
+ }
virDomainVirtioOptionsFormat(&driverBuf, def->virtio);
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 05a035a16..28abe2b0b 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -668,6 +668,7 @@ struct _virDomainDiskDef {
unsigned int iothread; /* unused = 0, > 0 specific thread # */
int detect_zeroes; /* enum virDomainDiskDetectZeroes */
char *domain_name; /* backend domain name */
+ unsigned int queues;
virDomainVirtioOptionsPtr virtio;
};
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 085910dd4..f9028157f 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -442,6 +442,7 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
/* 270 */
"vxhs",
+ "virtio-blk.num-queues",
);
@@ -1692,6 +1693,7 @@ static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsVirtioBlk[] = {
{ "event_idx", QEMU_CAPS_VIRTIO_BLK_EVENT_IDX },
{ "scsi", QEMU_CAPS_VIRTIO_BLK_SCSI },
{ "logical_block_size", QEMU_CAPS_BLOCKIO },
+ { "num-queues", QEMU_CAPS_VIRTIO_BLK_NUM_QUEUES },
};
static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsVirtioNet[] = {
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 214734ff2..2d16e5b0e 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -428,6 +428,7 @@ typedef enum {
/* 270 */
QEMU_CAPS_VXHS, /* -drive file.driver=vxhs via query-qmp-schema */
+ QEMU_CAPS_VIRTIO_BLK_NUM_QUEUES, /* virtio-blk-*.num-queues */
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 4f141e0ac..4d2787d8f 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -2082,6 +2082,10 @@ qemuBuildDriveDevStr(const virDomainDef *def,
(disk->device == VIR_DOMAIN_DISK_DEVICE_LUN)
? "on" : "off");
}
+ if (disk->queues &&
+ virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_BLK_NUM_QUEUES)) {
+ virBufferAsprintf(&opt, ",num-queues=%u", disk->queues);
+ }
if (qemuBuildVirtioOptionsStr(&opt, disk->virtio, qemuCaps) < 0)
goto error;
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-virtio-drive-queues.args b/tests/qemuxml2argvdata/qemuxml2argv-disk-virtio-drive-queues.args
new file mode 100644
index 000000000..5e0ce8b8f
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-virtio-drive-queues.args
@@ -0,0 +1,24 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-i686 \
+-name QEMUGuest1 \
+-S \
+-M pc \
+-m 214 \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-nographic \
+-nodefaults \
+-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-QEMUGuest1/monitor.sock,\
+server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=readline \
+-no-acpi \
+-boot c \
+-usb \
+-drive file=/tmp/data.img,format=raw,if=none,id=drive-virtio-disk0 \
+-device virtio-blk-pci,num-queues=4,bus=pci.0,addr=0x3,drive=drive-virtio-disk0,\
+id=virtio-disk0
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-virtio-drive-queues.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-virtio-drive-queues.xml
new file mode 100644
index 000000000..37885c6f9
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-virtio-drive-queues.xml
@@ -0,0 +1,34 @@
+<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'>1</vcpu>
+ <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-system-i686</emulator>
+ <disk type='file' device='disk'>
+ <driver name='qemu' type='raw' queues='4'/>
+ <source file='/tmp/data.img'/>
+ <target dev='vda' bus='virtio'/>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
+ </disk>
+ <controller type='usb' index='0'>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
+ </controller>
+ <controller type='ide' index='0'>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
+ </controller>
+ <controller type='pci' index='0' model='pci-root'/>
+ <input type='mouse' bus='ps2'/>
+ <input type='keyboard' bus='ps2'/>
+ <memballoon model='none'/>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 7271ea07e..a505864b8 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -892,6 +892,8 @@ mymain(void)
QEMU_CAPS_VIRTIO_CCW, QEMU_CAPS_VIRTIO_S390);
DO_TEST("disk-order",
QEMU_CAPS_DRIVE_BOOT, QEMU_CAPS_VIRTIO_BLK_SCSI);
+ DO_TEST("disk-virtio-drive-queues",
+ QEMU_CAPS_VIRTIO_BLK_NUM_QUEUES);
DO_TEST("disk-drive-boot-disk",
QEMU_CAPS_DRIVE_BOOT);
DO_TEST("disk-drive-boot-cdrom",
diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-virtio-drive-queues.xml b/tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-virtio-drive-queues.xml
new file mode 120000
index 000000000..a4efc340e
--- /dev/null
+++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-virtio-drive-queues.xml
@@ -0,0 +1 @@
+../qemuxml2argvdata/qemuxml2argv-disk-virtio-drive-queues.xml
\ No newline at end of file
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index 2dba3607c..73489eed9 100644
--- a/tests/qemuxml2xmltest.c
+++ b/tests/qemuxml2xmltest.c
@@ -449,6 +449,7 @@ mymain(void)
DO_TEST("disk-usb-device", NONE);
DO_TEST("disk-virtio", NONE);
DO_TEST("floppy-drive-fat", NONE);
+ DO_TEST("disk-virtio-drive-queues", QEMU_CAPS_VIRTIO_BLK_NUM_QUEUES);
DO_TEST("disk-drive-boot-disk", NONE);
DO_TEST("disk-drive-boot-cdrom", NONE);
DO_TEST("disk-drive-error-policy-stop", NONE);
--
2.14.0
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