[PATCH 8/9] qemu_driver: Add support to set/get migration parameters.

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From: Eli Qiao <liyong.qiao@xxxxxxxxx>

Add qemuDomainMigrateGetParameters and qemuDomainMigrateSetParameters
in order to set or get multi-thread compress parameters.

Signed-off-by: ShaoHe Feng <shaohe.feng@xxxxxxxxx>
Signed-off-by: Eli Qiao <liyong.qiao@xxxxxxxxx>
---
 src/qemu/qemu_driver.c | 158 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 158 insertions(+)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 498bcac..16a8b44 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -110,6 +110,8 @@ VIR_LOG_INIT("qemu.qemu_driver");
 #define QEMU_NB_BLOCK_IO_TUNE_PARAM  6
 #define QEMU_NB_BLOCK_IO_TUNE_PARAM_MAX  13
 
+#define QEMU_NB_MIGRATE_COMPRESS_PARAM  3
+
 #define QEMU_NB_NUMA_PARAM 2
 
 #define QEMU_SCHED_MIN_PERIOD              1000LL
@@ -13745,6 +13747,160 @@ qemuDomainMigrateGetMaxSpeed(virDomainPtr dom,
     return ret;
 }
 
+static int
+qemuDomainMigrateSetParameters(virDomainPtr dom,
+                               virTypedParameterPtr params,
+                               int nparams,
+                               unsigned int flags)
+{
+    size_t i;
+    virQEMUDriverPtr driver = dom->conn->privateData;
+    virDomainObjPtr vm;
+    qemuDomainObjPrivatePtr priv;
+    int ret = -1;
+    int level = -1;
+    int threads = -1;
+    int dthreads = -1;
+
+    virCheckFlags(VIR_TYPED_PARAM_STRING_OKAY, -1);
+
+    if (!(vm = qemuDomObjFromDomain(dom)))
+        goto cleanup;
+
+    if (virTypedParamsValidate(params, nparams,
+                               VIR_DOMAIN_MIRGRATE_COMPRESSION_LEVEL,
+                               VIR_TYPED_PARAM_INT,
+                               VIR_DOMAIN_MIRGRATE_COMPRESSION_THREADS,
+                               VIR_TYPED_PARAM_INT,
+                               VIR_DOMAIN_MIRGRATE_DECOMPRESSION_THREADS,
+                               VIR_TYPED_PARAM_INT,
+                               NULL) < 0)
+        goto cleanup;
+
+    if (virDomainMigrateSetParametersEnsureACL(dom->conn, vm->def) < 0)
+        goto cleanup;
+
+    priv = vm->privateData;
+
+    for (i = 0; i < nparams; i++) {
+        virTypedParameterPtr param = &params[i];
+
+        if (STREQ(param->field, VIR_DOMAIN_MIRGRATE_COMPRESSION_LEVEL)) {
+            level = params[i].value.i;
+        } else if (STREQ(param->field, VIR_DOMAIN_MIRGRATE_COMPRESSION_THREADS)) {
+            threads = params[i].value.i;
+        } else if (STREQ(param->field, VIR_DOMAIN_MIRGRATE_DECOMPRESSION_THREADS)) {
+            dthreads = params[i].value.i;
+        }
+    }
+
+    if (level > QEMU_DOMAIN_MIG_PARAMETERS_LEVEL_MAX) {
+        virReportError(VIR_ERR_OVERFLOW,
+                       _("level must be less than %d"),
+                       QEMU_DOMAIN_MIG_PARAMETERS_LEVEL_MAX + 1);
+        goto cleanup;
+    } else if (priv->job.asyncJob == QEMU_ASYNC_JOB_MIGRATION_IN) {
+        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+                        _("compress level is invalid for destination "
+                          "hypervisor during live migration"));
+        goto cleanup;
+    }
+
+    if ((threads > QEMU_DOMAIN_MIG_PARAMETERS_THREADS_MAX) ||
+        (dthreads > QEMU_DOMAIN_MIG_PARAMETERS_THREADS_MAX)) {
+        virReportError(VIR_ERR_OVERFLOW, _("both compress and decompress "
+                       "threads number must be less than %d"),
+                       QEMU_DOMAIN_MIG_PARAMETERS_THREADS_MAX + 1);
+        goto cleanup;
+    } else if ((priv->job.asyncJob == QEMU_ASYNC_JOB_MIGRATION_IN) ||
+               (priv->job.asyncJob == QEMU_ASYNC_JOB_MIGRATION_OUT)) {
+        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+                       _("neither compress nor decompress threads number "
+                         "setting is valid during live migration"));
+        goto cleanup;
+    }
+
+    VIR_DEBUG("Setting migration multi-thread compress parameters: "
+              "level is %d, compress threads is %d, "
+              "decompress threads is %d", level, threads, dthreads);
+
+    qemuDomainObjEnterMonitor(driver, vm);
+    ret = qemuMonitorSetMigrationParameters(priv->mon, level, threads, dthreads);
+
+    if (qemuDomainObjExitMonitor(driver, vm) < 0)
+        ret = -1;
+    ret = 0;
+
+ cleanup:
+    virDomainObjEndAPI(&vm);
+    return ret;
+}
+
+
+static int
+qemuDomainMigrateGetParameters(virDomainPtr dom,
+                               virTypedParameterPtr params,
+                               int *nparams,
+                               unsigned int flags)
+{
+    virDomainObjPtr vm;
+    virQEMUDriverPtr driver = dom->conn->privateData;
+    qemuDomainObjPrivatePtr priv;
+    int ret = -1;
+    unsigned int level = 0;
+    unsigned int threads = 0;
+    unsigned int dthreads = 0;
+
+
+    virCheckFlags(VIR_TYPED_PARAM_STRING_OKAY, -1);
+
+    if (!(vm = qemuDomObjFromDomain(dom)))
+        goto cleanup;
+
+    priv = vm->privateData;
+
+    if (virDomainMigrateGetParametersEnsureACL(dom->conn, vm->def) < 0)
+        goto cleanup;
+
+    if ((*nparams) == 0) {
+        *nparams = QEMU_NB_MIGRATE_COMPRESS_PARAM;
+        ret = 0;
+        goto cleanup;
+    }
+
+    qemuDomainObjEnterMonitor(driver, vm);
+    /* now qemu only support 3 compression parameters,
+       and compession method such as zlib will support in later version. */
+    ret = qemuMonitorGetMigrationParameters(priv->mon, &level, &threads, &dthreads) < 0;
+    if (qemuDomainObjExitMonitor(driver, vm) < 0)
+        ret = -1;
+    if (ret < 0)
+        goto cleanup;
+
+    if (virTypedParameterAssign(params,
+                                VIR_DOMAIN_MIRGRATE_COMPRESSION_LEVEL,
+                                VIR_TYPED_PARAM_UINT,
+                                level) < 0)
+        goto cleanup;
+
+    if (virTypedParameterAssign(params + 1,
+                                VIR_DOMAIN_MIRGRATE_COMPRESSION_THREADS,
+                                VIR_TYPED_PARAM_UINT,
+                                threads) < 0)
+        goto cleanup;
+
+    if (virTypedParameterAssign(params + 2,
+                                VIR_DOMAIN_MIRGRATE_DECOMPRESSION_THREADS,
+                                VIR_TYPED_PARAM_UINT,
+                                dthreads) < 0)
+        goto cleanup;
+
+    ret = 0;
+
+ cleanup:
+    virDomainObjEndAPI(&vm);
+    return ret;
+}
 
 typedef enum {
     VIR_DISK_CHAIN_NO_ACCESS,
@@ -20315,6 +20471,8 @@ static virHypervisorDriver qemuHypervisorDriver = {
     .domainMigrateSetCompressionCache = qemuDomainMigrateSetCompressionCache, /* 1.0.3 */
     .domainMigrateSetMaxSpeed = qemuDomainMigrateSetMaxSpeed, /* 0.9.0 */
     .domainMigrateGetMaxSpeed = qemuDomainMigrateGetMaxSpeed, /* 0.9.5 */
+    .domainMigrateGetParameters = qemuDomainMigrateGetParameters, /* 1.2.17 */
+    .domainMigrateSetParameters = qemuDomainMigrateSetParameters, /* 1.2.17 */
     .connectDomainEventRegisterAny = qemuConnectDomainEventRegisterAny, /* 0.8.0 */
     .connectDomainEventDeregisterAny = qemuConnectDomainEventDeregisterAny, /* 0.8.0 */
     .domainManagedSave = qemuDomainManagedSave, /* 0.8.0 */
-- 
2.1.4

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