[PATCH 18/20] qemu: Add support for parallel save and restore

Add support for parallel save and restore by mapping libvirt's "parallel-connections" parameter to QEMU's "multifd-channels" migration parameter. Signed-off-by: Jim Fehlig <jfehlig(a)suse.com&gt; --- src/qemu/qemu_driver.c | 31 ++++++++++++++++++++----------- src/qemu/qemu_migration_params.c | 25 +++++++++++++++++++++++-- src/qemu/qemu_migration_params.h | 5 ++++- 3 files changed, 47 insertions(+), 14 deletions(-) diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index 0025bad6e7..fce599b321 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -2608,6 +2608,8 @@ qemuDomainSaveInternal(virQEMUDriver *driver, int compressed, virCommand *compressor, const char *xmlin, + virTypedParameterPtr params, + int nparams, unsigned int flags) { g_autofree char *xml = NULL; @@ -2691,7 +2693,7 @@ qemuDomainSaveInternal(virQEMUDriver *driver, xml = NULL; mappedRam = data->header.features & QEMU_SAVE_FEATURE_MAPPED_RAM; - if (!(saveParams = qemuMigrationParamsForSave(mappedRam, flags))) + if (!(saveParams = qemuMigrationParamsForSave(params, nparams, mappedRam, flags))) goto endjob; ret = qemuSaveImageCreate(driver, vm, path, data, compressor, @@ -2777,7 +2779,7 @@ qemuDomainManagedSaveHelper(virQEMUDriver *driver, VIR_INFO("Saving state of domain '%s' to '%s'", vm->def->name, path); if (qemuDomainSaveInternal(driver, vm, path, compressed, - compressor, dxml, flags) < 0) + compressor, dxml, NULL, 0, flags) < 0) return -1; vm->hasManagedSave = true; @@ -2816,7 +2818,7 @@ qemuDomainSaveFlags(virDomainPtr dom, const char *path, const char *dxml, goto cleanup; ret = qemuDomainSaveInternal(driver, vm, path, compressed, - compressor, dxml, flags); + compressor, dxml, NULL, 0, flags); cleanup: virDomainObjEndAPI(&vm); @@ -2846,13 +2848,16 @@ qemuDomainSaveParams(virDomainPtr dom, virCheckFlags(VIR_DOMAIN_SAVE_BYPASS_CACHE | VIR_DOMAIN_SAVE_RUNNING | - VIR_DOMAIN_SAVE_PAUSED, -1); + VIR_DOMAIN_SAVE_PAUSED | + VIR_DOMAIN_SAVE_PARALLEL, -1); if (virTypedParamsValidate(params, nparams, VIR_DOMAIN_SAVE_PARAM_FILE, VIR_TYPED_PARAM_STRING, VIR_DOMAIN_SAVE_PARAM_DXML, VIR_TYPED_PARAM_STRING, + VIR_DOMAIN_SAVE_PARAM_PARALLEL_CONNECTIONS, + VIR_TYPED_PARAM_INT, NULL) < 0) return -1; @@ -2884,7 +2889,7 @@ qemuDomainSaveParams(virDomainPtr dom, goto cleanup; ret = qemuDomainSaveInternal(driver, vm, to, compressed, - compressor, dxml, flags); + compressor, dxml, params, nparams, flags); cleanup: virDomainObjEndAPI(&vm); @@ -5759,6 +5764,8 @@ static int qemuDomainRestoreInternal(virConnectPtr conn, const char *path, const char *dxml, + virTypedParameterPtr params, + int nparams, unsigned int flags, int (*ensureACL)(virConnectPtr, virDomainDef *)) { @@ -5780,7 +5787,8 @@ qemuDomainRestoreInternal(virConnectPtr conn, virCheckFlags(VIR_DOMAIN_SAVE_BYPASS_CACHE | VIR_DOMAIN_SAVE_RUNNING | VIR_DOMAIN_SAVE_PAUSED | - VIR_DOMAIN_SAVE_RESET_NVRAM, -1); + VIR_DOMAIN_SAVE_RESET_NVRAM | + VIR_DOMAIN_SAVE_PARALLEL, -1); if (flags & VIR_DOMAIN_SAVE_RESET_NVRAM) reset_nvram = true; @@ -5789,7 +5797,7 @@ qemuDomainRestoreInternal(virConnectPtr conn, goto cleanup; mapped_ram = data->header.features & QEMU_SAVE_FEATURE_MAPPED_RAM; - if (!(restoreParams = qemuMigrationParamsForSave(mapped_ram, flags))) + if (!(restoreParams = qemuMigrationParamsForSave(params, nparams, mapped_ram, flags))) return -1; fd = qemuSaveImageOpen(driver, path, @@ -5871,7 +5879,7 @@ qemuDomainRestoreFlags(virConnectPtr conn, const char *dxml, unsigned int flags) { - return qemuDomainRestoreInternal(conn, path, dxml, flags, + return qemuDomainRestoreInternal(conn, path, dxml, NULL, 0, flags, virDomainRestoreFlagsEnsureACL); } @@ -5879,7 +5887,7 @@ static int qemuDomainRestore(virConnectPtr conn, const char *path) { - return qemuDomainRestoreInternal(conn, path, NULL, 0, + return qemuDomainRestoreInternal(conn, path, NULL, NULL, 0, 0, virDomainRestoreEnsureACL); } @@ -5895,6 +5903,7 @@ qemuDomainRestoreParams(virConnectPtr conn, if (virTypedParamsValidate(params, nparams, VIR_DOMAIN_SAVE_PARAM_FILE, VIR_TYPED_PARAM_STRING, VIR_DOMAIN_SAVE_PARAM_DXML, VIR_TYPED_PARAM_STRING, + VIR_DOMAIN_SAVE_PARAM_PARALLEL_CONNECTIONS, VIR_TYPED_PARAM_INT, NULL) < 0) return -1; @@ -5911,7 +5920,7 @@ qemuDomainRestoreParams(virConnectPtr conn, return -1; } - ret = qemuDomainRestoreInternal(conn, path, dxml, flags, + ret = qemuDomainRestoreInternal(conn, path, dxml, params, nparams, flags, virDomainRestoreParamsEnsureACL); return ret; } @@ -6115,7 +6124,7 @@ qemuDomainObjRestore(virConnectPtr conn, } mapped_ram = data->header.features & QEMU_SAVE_FEATURE_MAPPED_RAM; - if (!(restoreParams = qemuMigrationParamsForSave(mapped_ram, + if (!(restoreParams = qemuMigrationParamsForSave(NULL, 0, mapped_ram, bypass_cache ? VIR_DOMAIN_SAVE_BYPASS_CACHE : 0))) return -1; diff --git a/src/qemu/qemu_migration_params.c b/src/qemu/qemu_migration_params.c index 8f6003005c..8c656af163 100644 --- a/src/qemu/qemu_migration_params.c +++ b/src/qemu/qemu_migration_params.c @@ -788,7 +788,10 @@ qemuMigrationParamsFromFlags(virTypedParameterPtr params, qemuMigrationParams * -qemuMigrationParamsForSave(bool mappedRam, unsigned int flags) +qemuMigrationParamsForSave(virTypedParameterPtr params, + int nparams, + bool mappedRam, + unsigned int flags) { g_autoptr(qemuMigrationParams) saveParams = NULL; @@ -800,7 +803,25 @@ qemuMigrationParamsForSave(bool mappedRam, unsigned int flags) return NULL; if (virBitmapSetBit(saveParams->caps, QEMU_MIGRATION_CAP_MULTIFD) < 0) return NULL; - saveParams->params[QEMU_MIGRATION_PARAM_MULTIFD_CHANNELS].value.i = 1; + + if (flags & VIR_DOMAIN_SAVE_PARALLEL) { + int nchannels; + + if (params && virTypedParamsGetInt(params, nparams, + VIR_DOMAIN_SAVE_PARAM_PARALLEL_CONNECTIONS, + &nchannels) < 0) + return NULL; + + if (nchannels < 1) { + virReportError(VIR_ERR_INVALID_ARG, "%s", + _("number of parallel save channels cannot be less than 1")); + return NULL; + } + + saveParams->params[QEMU_MIGRATION_PARAM_MULTIFD_CHANNELS].value.i = nchannels; + } else { + saveParams->params[QEMU_MIGRATION_PARAM_MULTIFD_CHANNELS].value.i = 1; + } saveParams->params[QEMU_MIGRATION_PARAM_MULTIFD_CHANNELS].set = true; if (flags & VIR_DOMAIN_SAVE_BYPASS_CACHE) { diff --git a/src/qemu/qemu_migration_params.h b/src/qemu/qemu_migration_params.h index 9700469b5e..a672b3d875 100644 --- a/src/qemu/qemu_migration_params.h +++ b/src/qemu/qemu_migration_params.h @@ -88,7 +88,10 @@ qemuMigrationParamsFromFlags(virTypedParameterPtr params, qemuMigrationParty party); qemuMigrationParams * -qemuMigrationParamsForSave(bool mappedRam, unsigned int flags); +qemuMigrationParamsForSave(virTypedParameterPtr params, + int nparams, + bool mappedRam, + unsigned int flags); int qemuMigrationParamsDump(qemuMigrationParams *migParams, -- 2.35.3