[libvirt] [PATCH 2/2] qemu: Support for Block Device IO Limits.
Viktor Mihajlovski
mihajlov at linux.vnet.ibm.com
Wed Aug 29 15:48:31 UTC 2012
Implementation of iolimits for the qemu driver with
capability probing for block size attribute and
command line generation for block sizes.
Including testcase for qemuxml2argvtest.
Signed-off-by: Viktor Mihajlovski <mihajlov at linux.vnet.ibm.com>
---
src/qemu/qemu_capabilities.c | 11 ++++++
src/qemu/qemu_capabilities.h | 1 +
src/qemu/qemu_command.c | 8 +++++
tests/qemuhelptest.c | 12 +++++--
.../qemuxml2argv-disk-iolimits.args | 9 +++++
.../qemuxml2argv-disk-iolimits.xml | 33 ++++++++++++++++++++
tests/qemuxml2argvtest.c | 3 ++
7 files changed, 73 insertions(+), 4 deletions(-)
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-iolimits.args
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-iolimits.xml
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 5472267..7b29a81 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -172,6 +172,7 @@ VIR_ENUM_IMPL(qemuCaps, QEMU_CAPS_LAST,
"bridge", /* 100 */
"lsi",
"virtio-scsi-pci",
+ "iolimits",
);
@@ -1499,6 +1500,16 @@ qemuCapsParseDeviceStr(const char *str, virBitmapPtr flags)
qemuCapsSet(flags, QEMU_CAPS_SCSI_CD);
if (strstr(str, "ide-cd"))
qemuCapsSet(flags, QEMU_CAPS_IDE_CD);
+ /*
+ * the iolimit detection is not really straight forward:
+ * in qemu this is a capability of the block layer, if
+ * present any of -device scsi-disk, virtio-blk-*, ...
+ * will offer to specify logical and physical block size
+ * and other properties...
+ */
+ if (strstr(str, ".logical_block_size") &&
+ strstr(str, ".physical_block_size"))
+ qemuCapsSet(flags, QEMU_CAPS_IOLIMITS);
return 0;
}
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index d606890..b0e41ba 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -138,6 +138,7 @@ enum qemuCapsFlags {
QEMU_CAPS_NETDEV_BRIDGE = 100, /* bridge helper support */
QEMU_CAPS_SCSI_LSI = 101, /* -device lsi */
QEMU_CAPS_VIRTIO_SCSI_PCI = 102, /* -device virtio-scsi-pci */
+ QEMU_CAPS_IOLIMITS = 103, /* -device ...logical_block_size & co */
QEMU_CAPS_LAST, /* this must always be the last item */
};
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 8c32a4d..f2dab2f 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -2637,6 +2637,14 @@ qemuBuildDriveDevStr(virDomainDefPtr def,
virBufferAsprintf(&opt, ",id=%s", disk->info.alias);
if (bootindex && qemuCapsGet(qemuCaps, QEMU_CAPS_BOOTINDEX))
virBufferAsprintf(&opt, ",bootindex=%d", bootindex);
+ if (qemuCapsGet(qemuCaps, QEMU_CAPS_IOLIMITS)) {
+ if (disk->iolimits.logical_block_size > 0)
+ virBufferAsprintf(&opt, ",logical_block_size=%u",
+ disk->iolimits.logical_block_size);
+ if (disk->iolimits.physical_block_size > 0)
+ virBufferAsprintf(&opt, ",physical_block_size=%u",
+ disk->iolimits.physical_block_size);
+ }
if (virBufferError(&opt)) {
virReportOOMError();
diff --git a/tests/qemuhelptest.c b/tests/qemuhelptest.c
index 2d15c94..a391edd 100644
--- a/tests/qemuhelptest.c
+++ b/tests/qemuhelptest.c
@@ -540,7 +540,8 @@ mymain(void)
QEMU_CAPS_NO_ACPI,
QEMU_CAPS_VIRTIO_BLK_SCSI,
QEMU_CAPS_VIRTIO_BLK_SG_IO,
- QEMU_CAPS_CPU_HOST);
+ QEMU_CAPS_CPU_HOST,
+ QEMU_CAPS_IOLIMITS);
DO_TEST("qemu-kvm-0.12.1.2-rhel62-beta", 12001, 1, 0,
QEMU_CAPS_VNC_COLON,
QEMU_CAPS_NO_REBOOT,
@@ -607,7 +608,8 @@ mymain(void)
QEMU_CAPS_VIRTIO_BLK_SG_IO,
QEMU_CAPS_DRIVE_COPY_ON_READ,
QEMU_CAPS_CPU_HOST,
- QEMU_CAPS_SCSI_CD);
+ QEMU_CAPS_SCSI_CD,
+ QEMU_CAPS_IOLIMITS);
DO_TEST("qemu-1.0", 1000000, 0, 0,
QEMU_CAPS_VNC_COLON,
QEMU_CAPS_NO_REBOOT,
@@ -679,7 +681,8 @@ mymain(void)
QEMU_CAPS_SCSI_BLOCK,
QEMU_CAPS_SCSI_CD,
QEMU_CAPS_IDE_CD,
- QEMU_CAPS_SCSI_LSI);
+ QEMU_CAPS_SCSI_LSI,
+ QEMU_CAPS_IOLIMITS);
DO_TEST("qemu-1.1.0", 1001000, 0, 0,
QEMU_CAPS_VNC_COLON,
QEMU_CAPS_NO_REBOOT,
@@ -759,7 +762,8 @@ mymain(void)
QEMU_CAPS_NEC_USB_XHCI,
QEMU_CAPS_NETDEV_BRIDGE,
QEMU_CAPS_SCSI_LSI,
- QEMU_CAPS_VIRTIO_SCSI_PCI);
+ QEMU_CAPS_VIRTIO_SCSI_PCI,
+ QEMU_CAPS_IOLIMITS);
return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-iolimits.args b/tests/qemuxml2argvdata/qemuxml2argv-disk-iolimits.args
new file mode 100644
index 0000000..5fb1367
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-iolimits.args
@@ -0,0 +1,9 @@
+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test \
+/usr/bin/qemu -S -M pc -m 214 -smp 1 -nographic -nodefconfig -nodefaults \
+-monitor unix:/tmp/test-monitor,server,nowait -no-acpi -boot c \
+-drive file=/dev/HostVG/QEMUGuest1,if=none,id=drive-ide0-0-1 \
+-device ide-cd,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1 \
+-drive file=/tmp/idedisk.img,if=none,id=drive-ide0-0-2 \
+-device ide-hd,bus=ide.0,unit=2,drive=drive-ide0-0-2,id=ide0-0-2,\
+logical_block_size=512,physical_block_size=512 \
+-usb -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-iolimits.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-iolimits.xml
new file mode 100644
index 0000000..440984b
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-iolimits.xml
@@ -0,0 +1,33 @@
+<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</emulator>
+ <disk type='block' device='cdrom'>
+ <source dev='/dev/HostVG/QEMUGuest1'/>
+ <target dev='hda' bus='ide'/>
+ <address type='drive' controller='0' bus='0' target='0' unit='1'/>
+ </disk>
+ <disk type='file' device='disk'>
+ <source file='/tmp/idedisk.img'/>
+ <target dev='hdc' bus='ide'/>
+ <address type='drive' controller='0' bus='0' target='0' unit='2'/>
+ <iolimits logical_block_size='512' physical_block_size='512'/>
+ </disk>
+ <controller type='usb' index='0'/>
+ <controller type='ide' index='0'/>
+ <controller type='ide' index='1'/>
+ <memballoon model='virtio'/>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 71513fb..cc5b2c1 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -789,6 +789,9 @@ mymain(void)
QEMU_CAPS_IDE_CD);
DO_TEST("disk-geometry", QEMU_CAPS_DRIVE);
+ DO_TEST("disk-iolimits",
+ QEMU_CAPS_DRIVE, QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG,
+ QEMU_CAPS_IDE_CD, QEMU_CAPS_IOLIMITS);
VIR_FREE(driver.stateDir);
virCapabilitiesFree(driver.caps);
--
1.7.0.4
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