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https://gitlab.com/libvirt/libvirt.git
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qemu: migration: Migrate block dirty bitmaps corresponding to checkpoints
Preserve block dirty bitmaps after migration with QEMU_MONITOR_MIGRATE_NON_SHARED_(DISK|INC). This patch implements functions which offer the bitmaps to the destination, check for eligibility on destination and then configure source for the migration. Signed-off-by: Peter Krempa <pkrempa@redhat.com> Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
This commit is contained in:
Peter Krempa
parent
1475baed36
commit
9f61d14a9e
@ -2205,6 +2205,91 @@ qemuMigrationSrcCleanup(virDomainObjPtr vm,
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}
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/**
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* qemuMigrationSrcBeginPhaseBlockDirtyBitmaps:
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* @mig: migration cookie struct
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* @vm: domain object
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* @migrate_disks: disks which are being migrated
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* @nmigrage_disks: number of @migrate_disks
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*
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* Enumerates block dirty bitmaps on disks which will undergo storage migration
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* and fills them into @mig to be offered to the destination.
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*/
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static int
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qemuMigrationSrcBeginPhaseBlockDirtyBitmaps(qemuMigrationCookiePtr mig,
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virDomainObjPtr vm,
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const char **migrate_disks,
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size_t nmigrate_disks)
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{
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GSList *disks = NULL;
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qemuDomainObjPrivatePtr priv = vm->privateData;
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size_t i;
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g_autoptr(GHashTable) blockNamedNodeData = NULL;
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if (!(blockNamedNodeData = qemuBlockGetNamedNodeData(vm, priv->job.asyncJob)))
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return -1;
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for (i = 0; i < vm->def->ndisks; i++) {
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qemuMigrationBlockDirtyBitmapsDiskPtr disk;
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GSList *bitmaps = NULL;
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virDomainDiskDefPtr diskdef = vm->def->disks[i];
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qemuBlockNamedNodeDataPtr nodedata = virHashLookup(blockNamedNodeData, diskdef->src->nodeformat);
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size_t j;
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if (!nodedata)
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continue;
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if (migrate_disks) {
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bool migrating = false;
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for (j = 0; j < nmigrate_disks; j++) {
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if (STREQ(migrate_disks[j], diskdef->dst)) {
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migrating = true;
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break;
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}
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}
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if (!migrating)
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continue;
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}
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for (j = 0; j < nodedata->nbitmaps; j++) {
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qemuMigrationBlockDirtyBitmapsDiskBitmapPtr bitmap;
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if (!qemuBlockBitmapChainIsValid(diskdef->src,
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nodedata->bitmaps[j]->name,
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blockNamedNodeData))
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continue;
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bitmap = g_new0(qemuMigrationBlockDirtyBitmapsDiskBitmap, 1);
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bitmap->bitmapname = g_strdup(nodedata->bitmaps[j]->name);
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bitmap->alias = g_strdup_printf("libvirt-%s-%s",
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diskdef->dst,
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nodedata->bitmaps[j]->name);
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bitmaps = g_slist_prepend(bitmaps, bitmap);
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}
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if (!bitmaps)
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continue;
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disk = g_new0(qemuMigrationBlockDirtyBitmapsDisk, 1);
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disk->target = g_strdup(diskdef->dst);
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disk->bitmaps = bitmaps;
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disks = g_slist_prepend(disks, disk);
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}
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if (!disks)
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return 0;
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mig->blockDirtyBitmaps = disks;
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mig->flags |= QEMU_MIGRATION_COOKIE_BLOCK_DIRTY_BITMAPS;
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return 0;
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}
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/* The caller is supposed to lock the vm and start a migration job. */
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static char *
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qemuMigrationSrcBeginPhase(virQEMUDriverPtr driver,
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@ -2317,6 +2402,12 @@ qemuMigrationSrcBeginPhase(virQEMUDriverPtr driver,
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if (!(mig = qemuMigrationCookieNew(vm->def, priv->origname)))
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return NULL;
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if (cookieFlags & QEMU_MIGRATION_COOKIE_NBD &&
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virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATION_PARAM_BLOCK_BITMAP_MAPPING) &&
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qemuMigrationSrcBeginPhaseBlockDirtyBitmaps(mig, vm, migrate_disks,
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nmigrate_disks) < 0)
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return NULL;
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if (qemuMigrationCookieFormat(mig, driver, vm,
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QEMU_MIGRATION_SOURCE,
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cookieout, cookieoutlen,
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@ -2530,6 +2621,92 @@ qemuMigrationDstPrepare(virDomainObjPtr vm,
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migrateFrom, fd, NULL);
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}
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/**
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* qemuMigrationDstPrepareAnyBlockDirtyBitmaps:
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* @vm: domain object
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* @mig: migration cookie
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* @migParams: migration parameters
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* @flags: migration flags
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*
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* Checks whether block dirty bitmaps offered by the migration source are
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* to be migrated (e.g. they don't exist, the destination is compatible etc)
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* and sets up destination qemu for migrating the bitmaps as well as updates the
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* list of eligible bitmaps in the migration cookie to be sent back to the
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* source.
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*/
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static int
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qemuMigrationDstPrepareAnyBlockDirtyBitmaps(virDomainObjPtr vm,
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qemuMigrationCookiePtr mig,
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qemuMigrationParamsPtr migParams,
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unsigned int flags)
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{
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qemuDomainObjPrivatePtr priv = vm->privateData;
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g_autoptr(virJSONValue) mapping = NULL;
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g_autoptr(GHashTable) blockNamedNodeData = NULL;
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GSList *nextdisk;
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if (!mig->nbd ||
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!mig->blockDirtyBitmaps ||
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!(flags & (VIR_MIGRATE_NON_SHARED_DISK | VIR_MIGRATE_NON_SHARED_INC)) ||
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!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATION_PARAM_BLOCK_BITMAP_MAPPING))
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return 0;
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if (qemuMigrationCookieBlockDirtyBitmapsMatchDisks(vm->def, mig->blockDirtyBitmaps) < 0)
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return -1;
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if (!(blockNamedNodeData = qemuBlockGetNamedNodeData(vm, QEMU_ASYNC_JOB_MIGRATION_IN)))
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return -1;
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for (nextdisk = mig->blockDirtyBitmaps; nextdisk; nextdisk = nextdisk->next) {
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qemuMigrationBlockDirtyBitmapsDiskPtr disk = nextdisk->data;
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qemuBlockNamedNodeDataPtr nodedata;
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GSList *nextbitmap;
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if (!(nodedata = virHashLookup(blockNamedNodeData, disk->nodename))) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("failed to find data for block node '%s'"),
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disk->nodename);
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return -1;
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}
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/* Bitmaps can only be migrated to qcow2 v3+ */
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if (disk->disk->src->format != VIR_STORAGE_FILE_QCOW2 ||
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nodedata->qcow2v2) {
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disk->skip = true;
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continue;
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}
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for (nextbitmap = disk->bitmaps; nextbitmap; nextbitmap = nextbitmap->next) {
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qemuMigrationBlockDirtyBitmapsDiskBitmapPtr bitmap = nextbitmap->data;
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size_t k;
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/* don't migrate into existing bitmaps */
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for (k = 0; k < nodedata->nbitmaps; k++) {
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if (STREQ(bitmap->bitmapname, nodedata->bitmaps[k]->name)) {
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bitmap->skip = true;
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break;
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}
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}
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if (bitmap->skip)
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continue;
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}
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}
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if (qemuMigrationCookieBlockDirtyBitmapsToParams(mig->blockDirtyBitmaps,
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&mapping) < 0)
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return -1;
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if (!mapping)
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return 0;
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qemuMigrationParamsSetBlockDirtyBitmapMapping(migParams, &mapping);
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mig->flags |= QEMU_MIGRATION_COOKIE_BLOCK_DIRTY_BITMAPS;
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return 0;
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}
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static int
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qemuMigrationDstPrepareAny(virQEMUDriverPtr driver,
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virConnectPtr dconn,
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@ -2679,7 +2856,8 @@ qemuMigrationDstPrepareAny(virQEMUDriverPtr driver,
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QEMU_MIGRATION_COOKIE_CPU_HOTPLUG |
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QEMU_MIGRATION_COOKIE_CPU |
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QEMU_MIGRATION_COOKIE_ALLOW_REBOOT |
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QEMU_MIGRATION_COOKIE_CAPS)))
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QEMU_MIGRATION_COOKIE_CAPS |
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QEMU_MIGRATION_COOKIE_BLOCK_DIRTY_BITMAPS)))
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goto cleanup;
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if (!(vm = virDomainObjListAdd(driver->domains, *def,
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@ -2772,6 +2950,9 @@ qemuMigrationDstPrepareAny(virQEMUDriverPtr driver,
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goto stopjob;
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}
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if (qemuMigrationDstPrepareAnyBlockDirtyBitmaps(vm, mig, migParams, flags) < 0)
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goto stopjob;
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if (qemuMigrationParamsCheck(driver, vm, QEMU_ASYNC_JOB_MIGRATION_IN,
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migParams, mig->caps->automatic) < 0)
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goto stopjob;
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@ -3654,6 +3835,145 @@ qemuMigrationSetDBusVMState(virQEMUDriverPtr driver,
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}
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/**
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* qemuMigrationSrcRunPrepareBlockDirtyBitmapsMerge:
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* @vm: domain object
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* @mig: migration cookie
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*
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* When migrating full disks, which means that the backing chain of the disk
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* will be squashed into a single image we need to calculate bitmaps
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* corresponding to the checkpoints which express the same set of changes
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* for migration.
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*
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* This function prepares temporary bitmaps and corresponding merges, updates
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* the data so that the temporary bitmaps are used and registers the temporary
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* bitmaps for deletion on failed migration.
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*/
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static int
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qemuMigrationSrcRunPrepareBlockDirtyBitmapsMerge(virDomainObjPtr vm,
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qemuMigrationCookiePtr mig)
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{
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g_autoslist(qemuDomainJobPrivateMigrateTempBitmap) tmpbitmaps = NULL;
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qemuDomainObjPrivatePtr priv = vm->privateData;
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qemuDomainJobPrivatePtr jobPriv = priv->job.privateData;
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virQEMUDriverPtr driver = priv->driver;
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g_autoptr(virJSONValue) actions = virJSONValueNewArray();
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g_autoptr(GHashTable) blockNamedNodeData = NULL;
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GSList *nextdisk;
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int rc;
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if (!(blockNamedNodeData = qemuBlockGetNamedNodeData(vm, QEMU_ASYNC_JOB_MIGRATION_OUT)))
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return -1;
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for (nextdisk = mig->blockDirtyBitmaps; nextdisk; nextdisk = nextdisk->next) {
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qemuMigrationBlockDirtyBitmapsDiskPtr disk = nextdisk->data;
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GSList *nextbitmap;
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/* if a disk doesn't have a backing chain we don't need the code below */
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if (!virStorageSourceHasBacking(disk->disk->src))
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continue;
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for (nextbitmap = disk->bitmaps; nextbitmap; nextbitmap = nextbitmap->next) {
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qemuMigrationBlockDirtyBitmapsDiskBitmapPtr bitmap = nextbitmap->data;
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qemuDomainJobPrivateMigrateTempBitmapPtr tmpbmp;
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virStorageSourcePtr n;
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unsigned long long granularity = 0;
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g_autoptr(virJSONValue) merge = virJSONValueNewArray();
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for (n = disk->disk->src; virStorageSourceIsBacking(n); n = n->backingStore) {
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qemuBlockNamedNodeDataBitmapPtr b;
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if (!(b = qemuBlockNamedNodeDataGetBitmapByName(blockNamedNodeData, n,
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bitmap->bitmapname)))
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break;
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if (granularity == 0)
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granularity = b->granularity;
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if (qemuMonitorTransactionBitmapMergeSourceAddBitmap(merge,
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n->nodeformat,
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b->name) < 0)
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return -1;
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}
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bitmap->sourcebitmap = g_strdup_printf("libvirt-migration-%s", bitmap->alias);
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bitmap->persistent = VIR_TRISTATE_BOOL_YES;
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if (qemuMonitorTransactionBitmapAdd(actions,
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disk->disk->src->nodeformat,
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bitmap->sourcebitmap,
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false, false, granularity) < 0)
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return -1;
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if (qemuMonitorTransactionBitmapMerge(actions,
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disk->disk->src->nodeformat,
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bitmap->sourcebitmap,
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&merge) < 0)
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return -1;
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tmpbmp = g_new0(qemuDomainJobPrivateMigrateTempBitmap, 1);
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tmpbmp->nodename = g_strdup(disk->disk->src->nodeformat);
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tmpbmp->bitmapname = g_strdup(bitmap->sourcebitmap);
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tmpbitmaps = g_slist_prepend(tmpbitmaps, tmpbmp);
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}
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}
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if (qemuDomainObjEnterMonitorAsync(driver, vm, QEMU_ASYNC_JOB_MIGRATION_OUT) < 0)
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return -1;
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rc = qemuMonitorTransaction(priv->mon, &actions);
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if (qemuDomainObjExitMonitor(driver, vm) < 0 || rc < 0)
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return -1;
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jobPriv->migTempBitmaps = g_steal_pointer(&tmpbitmaps);
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return 0;
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}
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/**
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* qemuMigrationSrcRunPrepareBlockDirtyBitmaps:
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* @vm: domain object
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* @mig: migration cookie
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* @migParams: migration parameters
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* @flags: migration flags
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*
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* Configures the source for bitmap migration when the destination asks
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* for bitmaps.
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*/
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static int
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qemuMigrationSrcRunPrepareBlockDirtyBitmaps(virDomainObjPtr vm,
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qemuMigrationCookiePtr mig,
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qemuMigrationParamsPtr migParams,
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unsigned int flags)
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{
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g_autoptr(virJSONValue) mapping = NULL;
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if (!mig->blockDirtyBitmaps)
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return 0;
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if (qemuMigrationCookieBlockDirtyBitmapsMatchDisks(vm->def, mig->blockDirtyBitmaps) < 0)
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return -1;
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/* For QEMU_MONITOR_MIGRATE_NON_SHARED_INC we can migrate the bitmaps
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* directly, otherwise we must create merged bitmaps from the whole
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* chain */
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if (!(flags & QEMU_MONITOR_MIGRATE_NON_SHARED_INC) &&
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qemuMigrationSrcRunPrepareBlockDirtyBitmapsMerge(vm, mig) < 0)
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return -1;
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if (qemuMigrationCookieBlockDirtyBitmapsToParams(mig->blockDirtyBitmaps,
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&mapping) < 0)
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return -1;
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qemuMigrationParamsSetBlockDirtyBitmapMapping(migParams, &mapping);
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return 0;
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}
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static int
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qemuMigrationSrcRun(virQEMUDriverPtr driver,
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virDomainObjPtr vm,
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@ -3710,6 +4030,10 @@ qemuMigrationSrcRun(virQEMUDriverPtr driver,
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cookieFlags |= QEMU_MIGRATION_COOKIE_NBD;
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}
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if (cookieFlags & QEMU_MIGRATION_COOKIE_NBD &&
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virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATION_PARAM_BLOCK_BITMAP_MAPPING))
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cookieFlags |= QEMU_MIGRATION_COOKIE_BLOCK_DIRTY_BITMAPS;
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if (virLockManagerPluginUsesState(driver->lockManager) &&
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!cookieout) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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@ -3742,13 +4066,18 @@ qemuMigrationSrcRun(virQEMUDriverPtr driver,
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cookiein, cookieinlen,
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cookieFlags |
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QEMU_MIGRATION_COOKIE_GRAPHICS |
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QEMU_MIGRATION_COOKIE_CAPS);
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QEMU_MIGRATION_COOKIE_CAPS |
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QEMU_MIGRATION_COOKIE_BLOCK_DIRTY_BITMAPS);
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if (!mig)
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goto error;
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if (qemuMigrationSrcGraphicsRelocate(driver, vm, mig, graphicsuri) < 0)
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VIR_WARN("unable to provide data for graphics client relocation");
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if (mig->blockDirtyBitmaps &&
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qemuMigrationSrcRunPrepareBlockDirtyBitmaps(vm, mig, migParams, flags) < 0)
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goto error;
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if (qemuMigrationParamsCheck(driver, vm, QEMU_ASYNC_JOB_MIGRATION_OUT,
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migParams, mig->caps->automatic) < 0)
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goto error;
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