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qemu_migration: Apply max-postcopy-bandwidth on post-copy resume

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When resuming post-copy migration users may want to limit the bandwidth
used by the migration and use a value that is different from the one
specified when the migration was originally started.

Resolves: https://gitlab.com/libvirt/libvirt/-/issues/333

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Jiri Denemark 2022-06-30 12:52:38 +02:00
parent 8c335b5530
commit 766abdc291
5 changed files with 42 additions and 22 deletions
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12
src/qemu/qemu_migration.c
View File

@ -5051,12 +5051,13 @@ qemuMigrationSrcRun(virQEMUDriver *driver,
static int
qemuMigrationSrcResume(virDomainObj *vm,
qemuMigrationParams *migParams G_GNUC_UNUSED,
qemuMigrationParams *migParams,
const char *cookiein,
int cookieinlen,
char **cookieout,
int *cookieoutlen,
qemuMigrationSpec *spec)
qemuMigrationSpec *spec,
unsigned long flags)
{
qemuDomainObjPrivate *priv = vm->privateData;
virQEMUDriver *driver = priv->driver;
@ -5073,6 +5074,10 @@ qemuMigrationSrcResume(virDomainObj *vm,
if (!mig)
return -1;
if (qemuMigrationParamsApply(driver, vm, VIR_ASYNC_JOB_MIGRATION_OUT,
migParams, flags) < 0)
return -1;
if (qemuDomainObjEnterMonitorAsync(driver, vm,
VIR_ASYNC_JOB_MIGRATION_OUT) < 0)
return -1;
@ -5154,6 +5159,7 @@ qemuMigrationSrcPerformNative(virQEMUDriver *driver,
if (STREQ(uribits->scheme, "unix")) {
if ((flags & VIR_MIGRATE_TLS) &&
!(flags & VIR_MIGRATE_POSTCOPY_RESUME) &&
!qemuMigrationParamsTLSHostnameIsSet(migParams)) {
virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
_("Explicit destination hostname is required "
@ -5185,7 +5191,7 @@ qemuMigrationSrcPerformNative(virQEMUDriver *driver,
if (flags & VIR_MIGRATE_POSTCOPY_RESUME) {
ret = qemuMigrationSrcResume(vm, migParams, cookiein, cookieinlen,
cookieout, cookieoutlen, &spec);
cookieout, cookieoutlen, &spec, flags);
} else {
ret = qemuMigrationSrcRun(driver, vm, persist_xml, cookiein, cookieinlen,
cookieout, cookieoutlen, flags, resource,

45
src/qemu/qemu_migration_params.c
View File

@ -141,6 +141,7 @@ struct _qemuMigrationParamsTPMapItem {
typedef struct _qemuMigrationParamInfoItem qemuMigrationParamInfoItem;
struct _qemuMigrationParamInfoItem {
qemuMigrationParamType type;
bool applyOnPostcopyResume;
};
/* Migration capabilities which should always be enabled as long as they
@ -265,6 +266,7 @@ static const qemuMigrationParamInfoItem qemuMigrationParamInfo[] = {
},
[QEMU_MIGRATION_PARAM_MAX_POSTCOPY_BANDWIDTH] = {
.type = QEMU_MIGRATION_PARAM_TYPE_ULL,
.applyOnPostcopyResume = true,
},
[QEMU_MIGRATION_PARAM_MULTIFD_CHANNELS] = {
.type = QEMU_MIGRATION_PARAM_TYPE_INT,
@ -782,7 +784,8 @@ qemuMigrationParamsFromJSON(virJSONValue *params)
virJSONValue *
qemuMigrationParamsToJSON(qemuMigrationParams *migParams)
qemuMigrationParamsToJSON(qemuMigrationParams *migParams,
bool postcopyResume)
{
g_autoptr(virJSONValue) params = virJSONValueNewObject();
size_t i;
@ -795,6 +798,9 @@ qemuMigrationParamsToJSON(qemuMigrationParams *migParams)
if (!pv->set)
continue;
if (postcopyResume && !qemuMigrationParamInfo[i].applyOnPostcopyResume)
continue;
switch (qemuMigrationParamInfo[i].type) {
case QEMU_MIGRATION_PARAM_TYPE_INT:
rc = virJSONValueObjectAppendNumberInt(params, name, pv->value.i);
@ -868,6 +874,7 @@ qemuMigrationCapsToJSON(virBitmap *caps,
*
* Send parameters stored in @migParams to QEMU. If @apiFlags is non-zero, some
* parameters that do not make sense for the enabled flags will be ignored.
* VIR_MIGRATE_POSTCOPY_RESUME is the only flag checked currently.
*
* Returns 0 on success, -1 on failure.
*/
@ -876,32 +883,38 @@ qemuMigrationParamsApply(virQEMUDriver *driver,
virDomainObj *vm,
int asyncJob,
qemuMigrationParams *migParams,
unsigned long apiFlags G_GNUC_UNUSED)
unsigned long apiFlags)
{
qemuDomainObjPrivate *priv = vm->privateData;
bool xbzrleCacheSize_old = false;
g_autoptr(virJSONValue) params = NULL;
g_autoptr(virJSONValue) caps = NULL;
qemuMigrationParam xbzrle = QEMU_MIGRATION_PARAM_XBZRLE_CACHE_SIZE;
bool postcopyResume = !!(apiFlags & VIR_MIGRATE_POSTCOPY_RESUME);
int ret = -1;
if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
return -1;
if (asyncJob == VIR_ASYNC_JOB_NONE) {
if (!virBitmapIsAllClear(migParams->caps)) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Migration capabilities can only be set by "
"a migration job"));
goto cleanup;
}
} else {
if (!(caps = qemuMigrationCapsToJSON(priv->migrationCaps, migParams->caps)))
goto cleanup;
/* Changing capabilities is only allowed before migration starts, we need
* to skip them when resuming post-copy migration.
*/
if (!postcopyResume) {
if (asyncJob == VIR_ASYNC_JOB_NONE) {
if (!virBitmapIsAllClear(migParams->caps)) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Migration capabilities can only be set by "
"a migration job"));
goto cleanup;
}
} else {
if (!(caps = qemuMigrationCapsToJSON(priv->migrationCaps, migParams->caps)))
goto cleanup;
if (virJSONValueArraySize(caps) > 0 &&
qemuMonitorSetMigrationCapabilities(priv->mon, &caps) < 0)
goto cleanup;
if (virJSONValueArraySize(caps) > 0 &&
qemuMonitorSetMigrationCapabilities(priv->mon, &caps) < 0)
goto cleanup;
}
}
/* If QEMU is too old to support xbzrle-cache-size migration parameter,
@ -917,7 +930,7 @@ qemuMigrationParamsApply(virQEMUDriver *driver,
migParams->params[xbzrle].set = false;
}
if (!(params = qemuMigrationParamsToJSON(migParams)))
if (!(params = qemuMigrationParamsToJSON(migParams, postcopyResume)))
goto cleanup;
if (virJSONValueObjectKeysNumber(params) > 0 &&

3
src/qemu/qemu_migration_paramspriv.h
View File

@ -26,7 +26,8 @@
#pragma once
virJSONValue *
qemuMigrationParamsToJSON(qemuMigrationParams *migParams);
qemuMigrationParamsToJSON(qemuMigrationParams *migParams,
bool postcopyResume);
qemuMigrationParams *
qemuMigrationParamsFromJSON(virJSONValue *params);

2
tests/qemumigparamstest.c
View File

@ -155,7 +155,7 @@ qemuMigParamsTestJSON(const void *opaque)
if (!(migParams = qemuMigrationParamsFromJSON(paramsIn)))
return -1;
if (!(paramsOut = qemuMigrationParamsToJSON(migParams)) ||
if (!(paramsOut = qemuMigrationParamsToJSON(migParams, false)) ||
!(actualJSON = virJSONValueToString(paramsOut, true)))
return -1;

2
tests/qemumigrationcookiexmltest.c
View File

@ -333,7 +333,7 @@ testQemuMigrationCookieBlockDirtyBitmaps(const void *opaque)
qemuMigrationParamsSetBlockDirtyBitmapMapping(migParams, &migParamsBitmaps);
if (!(paramsOut = qemuMigrationParamsToJSON(migParams)) ||
if (!(paramsOut = qemuMigrationParamsToJSON(migParams, false)) ||
!(actualJSON = virJSONValueToString(paramsOut, true)))
return -1;