With blockdev we must issue the block_set_io_throttle QMP command to setup disk throttling as we currently can't do it with the 'throttle' layer. Unfortunately there's nothing we can do if it fails. https://bugzilla.redhat.com/show_bug.cgi?id=1733163 Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx> --- src/qemu/qemu_hotplug.c | 18 +++++++++++++++++- src/qemu/qemu_process.c | 1 + 2 files changed, 18 insertions(+), 1 deletion(-) diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c index 30aa6d2344..a7034fd298 100644 --- a/src/qemu/qemu_hotplug.c +++ b/src/qemu/qemu_hotplug.c @@ -617,6 +617,7 @@ qemuDomainAttachDiskGeneric(virQEMUDriverPtr driver, VIR_AUTOUNREF(virQEMUDriverConfigPtr) cfg = virQEMUDriverGetConfig(driver); VIR_AUTOPTR(virJSONValue) corProps = NULL; VIR_AUTOFREE(char *) corAlias = NULL; + bool blockdev = virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV); if (qemuDomainStorageSourceChainAccessAllow(driver, vm, disk->src) < 0) goto cleanup; @@ -627,7 +628,7 @@ qemuDomainAttachDiskGeneric(virQEMUDriverPtr driver, if (qemuDomainPrepareDiskSource(disk, priv, cfg) < 0) goto error; - if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV)) { + if (blockdev) { if (disk->copy_on_read == VIR_TRISTATE_SWITCH_ON && !(corProps = qemuBlockStorageGetCopyOnReadProps(disk))) goto cleanup; @@ -667,6 +668,21 @@ qemuDomainAttachDiskGeneric(virQEMUDriverPtr driver, goto exit_monitor; } + /* Setup throttling of disk via block_set_io_throttle QMP command. This + * is a hack until the 'throttle' blockdev driver will support modification + * of the trhottle group. See also qemuProcessSetupDiskThrottlingBlockdev. + * As there isn't anything sane to do if this fails, let's just return + * success. + */ + if (blockdev && + qemuDiskConfigBlkdeviotuneEnabled(disk)) { + qemuDomainDiskPrivatePtr diskPriv = QEMU_DOMAIN_DISK_PRIVATE(disk); + if (qemuMonitorSetBlockIoThrottle(priv->mon, NULL, diskPriv->qomName, + &disk->blkdeviotune, + true, true, true) < 0) + VIR_WARN("failed to set blkdeviotune for '%s' of '%s'", disk->dst, vm->def->name); + } + if (qemuDomainObjExitMonitor(driver, vm) < 0) { ret = -2; goto error; diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c index c9921646e9..61b03c8a2d 100644 --- a/src/qemu/qemu_process.c +++ b/src/qemu/qemu_process.c @@ -6671,6 +6671,7 @@ qemuProcessGenID(virDomainObjPtr vm, * Sets up disk trottling for -blockdev via block_set_io_throttle monitor * command. This hack should be replaced by proper use of the 'throttle' * blockdev driver in qemu once it will support changing of the throttle group. + * Same hack is done in qemuDomainAttachDiskGeneric. */ static int qemuProcessSetupDiskThrottlingBlockdev(virQEMUDriverPtr driver, -- 2.21.0 -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list
