The default max_unmap_size is set to 1GB by qemu. The Maximum unmap LBA
count field in the block limits VPD page is impacted by it:
Maximum unmap LBA count = max unmap size / logical block size
Signed-off-by: Lin Ma <lma@xxxxxxxx>
---
src/qemu/qemu_command.c | 10 ++++++
.../disk-scsi-disk-max_unmap_size.args | 32 +++++++++++++++++++
.../disk-scsi-disk-max_unmap_size.xml | 28 ++++++++++++++++
tests/qemuxml2argvtest.c | 4 +++
4 files changed, 74 insertions(+)
create mode 100644 tests/qemuxml2argvdata/disk-scsi-disk-max_unmap_size.args
create mode 100644 tests/qemuxml2argvdata/disk-scsi-disk-max_unmap_size.xml
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 43f3a4c2a3..78f856766e 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -1852,6 +1852,16 @@ qemuBuildDiskDeviceStr(const virDomainDef *def,
if (disk->blockio.discard_granularity > 0)
virBufferAsprintf(&opt, ",discard_granularity=%u",
disk->blockio.discard_granularity);
+ if (disk->blockio.max_unmap_size > 0) {
+ if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_SCSI_DISK_MAX_UNMAP_SIZE)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("max_unmap_size property isn't supported by "
+ "this QEMU binary"));
+ return NULL;
+ }
+ virBufferAsprintf(&opt, ",max_unmap_size=%u",
+ disk->blockio.max_unmap_size);
+ }
}
if (disk->wwn) {
diff --git a/tests/qemuxml2argvdata/disk-scsi-disk-max_unmap_size.args b/tests/qemuxml2argvdata/disk-scsi-disk-max_unmap_size.args
new file mode 100644
index 0000000000..1d399ca451
--- /dev/null
+++ b/tests/qemuxml2argvdata/disk-scsi-disk-max_unmap_size.args
@@ -0,0 +1,32 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/tmp/lib/domain--1-QEMUGuest1 \
+USER=test \
+LOGNAME=test \
+XDG_DATA_HOME=/tmp/lib/domain--1-QEMUGuest1/.local/share \
+XDG_CACHE_HOME=/tmp/lib/domain--1-QEMUGuest1/.cache \
+XDG_CONFIG_HOME=/tmp/lib/domain--1-QEMUGuest1/.config \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-i386 \
+-name QEMUGuest1 \
+-S \
+-machine pc,accel=tcg,usb=off,dump-guest-core=off \
+-m 214 \
+-realtime mlock=off \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-QEMUGuest1/monitor.sock,\
+server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-no-acpi \
+-device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x3 \
+-usb \
+-drive file=/var/lib/libvirt/images/guest.raw,format=raw,if=none,id=drive-scsi0-0-0-0 \
+-device scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,\
+id=scsi0-0-0-0,bootindex=1,max_unmap_size=1073741824 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4
diff --git a/tests/qemuxml2argvdata/disk-scsi-disk-max_unmap_size.xml b/tests/qemuxml2argvdata/disk-scsi-disk-max_unmap_size.xml
new file mode 100644
index 0000000000..06c20e3431
--- /dev/null
+++ b/tests/qemuxml2argvdata/disk-scsi-disk-max_unmap_size.xml
@@ -0,0 +1,28 @@
+<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-i386</emulator>
+ <disk type='file' device='disk'>
+ <driver name='qemu' type='raw'/>
+ <source file='/var/lib/libvirt/images/guest.raw'/>
+ <target dev='sda' bus='scsi'/>
+ <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+ <blockio max_unmap_size='1073741824'/>
+ </disk>
+ <controller type='usb' index='0'/>
+ <controller type='scsi' index='0' model='virtio-scsi'/>
+ <memballoon model='virtio'/>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 02f8846e57..632dcd1ad8 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -1262,6 +1262,10 @@ mymain(void)
QEMU_CAPS_SCSI_LSI, QEMU_CAPS_VIRTIO_SCSI);
DO_TEST("disk-serial",
QEMU_CAPS_KVM);
+ DO_TEST("disk-scsi-disk-max_unmap_size",
+ QEMU_CAPS_BLOCKIO,
+ QEMU_CAPS_VIRTIO_SCSI,
+ QEMU_CAPS_SCSI_DISK_MAX_UNMAP_SIZE);
DO_TEST_PARSE_ERROR("disk-fdc-incompatible-address",
NONE);
DO_TEST_PARSE_ERROR("disk-ide-incompatible-address",
--
2.26.0
