[PATCH V3 17/19] qemu: Add support for parallel save and restore

Add support for parallel save and restore by mapping libvirt's "parallel-channels" parameter to QEMU's "multifd-channels" migration parameter. Signed-off-by: Jim Fehlig <jfehlig(a)suse.com&gt; --- src/qemu/qemu_driver.c | 32 +++++++++++++++++++++----------- src/qemu/qemu_migration_params.c | 31 +++++++++++++++++++++++++++++-- src/qemu/qemu_migration_params.h | 5 ++++- 3 files changed, 54 insertions(+), 14 deletions(-) diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index ad15689eb8..b842acf249 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -2611,6 +2611,8 @@ qemuDomainSaveInternal(virQEMUDriver *driver, int format, virCommand *compressor, const char *xmlin, + virTypedParameterPtr params, + int nparams, unsigned int flags) { g_autofree char *xml = NULL; @@ -2700,7 +2702,8 @@ qemuDomainSaveInternal(virQEMUDriver *driver, goto endjob; xml = NULL; - if (!(saveParams = qemuMigrationParamsForSave(format == QEMU_SAVE_FORMAT_SPARSE, + if (!(saveParams = qemuMigrationParamsForSave(params, nparams, + format == QEMU_SAVE_FORMAT_SPARSE, flags))) goto endjob; @@ -2787,7 +2790,7 @@ qemuDomainManagedSaveHelper(virQEMUDriver *driver, VIR_INFO("Saving state of domain '%s' to '%s'", vm->def->name, path); if (qemuDomainSaveInternal(driver, vm, path, format, - compressor, dxml, flags) < 0) + compressor, dxml, NULL, 0, flags) < 0) return -1; vm->hasManagedSave = true; @@ -2826,7 +2829,7 @@ qemuDomainSaveFlags(virDomainPtr dom, const char *path, const char *dxml, goto cleanup; ret = qemuDomainSaveInternal(driver, vm, path, format, - compressor, dxml, flags); + compressor, dxml, NULL, 0, flags); cleanup: virDomainObjEndAPI(&vm); @@ -2856,13 +2859,16 @@ 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_CHANNELS, + VIR_TYPED_PARAM_INT, NULL) < 0) return -1; @@ -2894,7 +2900,7 @@ qemuDomainSaveParams(virDomainPtr dom, goto cleanup; ret = qemuDomainSaveInternal(driver, vm, to, format, - compressor, dxml, flags); + compressor, dxml, params, nparams, flags); cleanup: virDomainObjEndAPI(&vm); @@ -5769,6 +5775,8 @@ static int qemuDomainRestoreInternal(virConnectPtr conn, const char *path, const char *dxml, + virTypedParameterPtr params, + int nparams, unsigned int flags, int (*ensureACL)(virConnectPtr, virDomainDef *)) { @@ -5790,7 +5798,8 @@ 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; @@ -5799,7 +5808,7 @@ qemuDomainRestoreInternal(virConnectPtr conn, goto cleanup; sparse = data->header.format == QEMU_SAVE_FORMAT_SPARSE; - if (!(restoreParams = qemuMigrationParamsForSave(sparse, flags))) + if (!(restoreParams = qemuMigrationParamsForSave(params, nparams, sparse, flags))) goto cleanup; fd = qemuSaveImageOpen(driver, path, @@ -5881,7 +5890,7 @@ qemuDomainRestoreFlags(virConnectPtr conn, const char *dxml, unsigned int flags) { - return qemuDomainRestoreInternal(conn, path, dxml, flags, + return qemuDomainRestoreInternal(conn, path, dxml, NULL, 0, flags, virDomainRestoreFlagsEnsureACL); } @@ -5889,7 +5898,7 @@ static int qemuDomainRestore(virConnectPtr conn, const char *path) { - return qemuDomainRestoreInternal(conn, path, NULL, 0, + return qemuDomainRestoreInternal(conn, path, NULL, NULL, 0, 0, virDomainRestoreEnsureACL); } @@ -5905,6 +5914,7 @@ 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_CHANNELS, VIR_TYPED_PARAM_INT, NULL) < 0) return -1; @@ -5921,7 +5931,7 @@ qemuDomainRestoreParams(virConnectPtr conn, return -1; } - ret = qemuDomainRestoreInternal(conn, path, dxml, flags, + ret = qemuDomainRestoreInternal(conn, path, dxml, params, nparams, flags, virDomainRestoreParamsEnsureACL); return ret; } @@ -6133,7 +6143,7 @@ qemuDomainObjRestore(virConnectPtr conn, } sparse = data->header.format == QEMU_SAVE_FORMAT_SPARSE; - if (!(restoreParams = qemuMigrationParamsForSave(sparse, + if (!(restoreParams = qemuMigrationParamsForSave(NULL, 0, sparse, 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 16e93f27d6..b696b0d13e 100644 --- a/src/qemu/qemu_migration_params.c +++ b/src/qemu/qemu_migration_params.c @@ -797,10 +797,19 @@ qemuMigrationParamsFromFlags(virTypedParameterPtr params, qemuMigrationParams * -qemuMigrationParamsForSave(bool sparse, unsigned int flags) +qemuMigrationParamsForSave(virTypedParameterPtr params, + int nparams, + bool sparse, + unsigned int flags) { g_autoptr(qemuMigrationParams) saveParams = NULL; + if (flags & VIR_DOMAIN_SAVE_PARALLEL && !sparse) { + virReportError(VIR_ERR_INVALID_ARG, "%s", + _("Parallel save is only supported with the 'sparse' save image format")); + return NULL; + } + if (!(saveParams = qemuMigrationParamsNew())) return NULL; @@ -809,7 +818,25 @@ qemuMigrationParamsForSave(bool sparse, 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_CHANNELS, + &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 87822332d3..9d771d519d 100644 --- a/src/qemu/qemu_migration_params.h +++ b/src/qemu/qemu_migration_params.h @@ -89,7 +89,10 @@ qemuMigrationParamsFromFlags(virTypedParameterPtr params, qemuMigrationParty party); qemuMigrationParams * -qemuMigrationParamsForSave(bool sparse, unsigned int flags); +qemuMigrationParamsForSave(virTypedParameterPtr params, + int nparams, + bool sparse, + unsigned int flags); int qemuMigrationParamsDump(qemuMigrationParams *migParams, -- 2.43.0