On Tue, Sep 30, 2014 at 16:39:25 +0200, Cristian Klein wrote:
> Signed-off-by: Cristian Klein <[email protected]>
> ---
> src/qemu/qemu_migration.c | 60
> +++++++++++++++++++++++++++++++++++++++++++++++
> src/qemu/qemu_migration.h | 3 ++-
> 2 files changed, 62 insertions(+), 1 deletion(-)
>
> diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
> index 284cd5a..4a36946 100644
> --- a/src/qemu/qemu_migration.c
> +++ b/src/qemu/qemu_migration.c
> @@ -1801,6 +1801,49 @@ qemuMigrationSetOffline(virQEMUDriverPtr driver,
>
>
> static int
> +qemuMigrationSetPostCopy(virQEMUDriverPtr driver,
> + virDomainObjPtr vm,
> + qemuDomainAsyncJob job)
> +{
> + qemuDomainObjPrivatePtr priv = vm->privateData;
> + int ret;
> +
> + if (qemuDomainObjEnterMonitorAsync(driver, vm, job) < 0)
> + return -1;
> +
> + ret = qemuMonitorGetMigrationCapability(
> + priv->mon,
> + QEMU_MONITOR_MIGRATION_CAPS_POSTCOPY);
> +
> + if (ret < 0) {
> + goto cleanup;
> + } else if (ret == 0) {
> + if (job == QEMU_ASYNC_JOB_MIGRATION_IN) {
> + virReportError(VIR_ERR_ARGUMENT_UNSUPPORTED, "%s",
> + _("Post-copy migration is not supported by "
> + "target QEMU binary"));
> + } else {
> + virReportError(VIR_ERR_ARGUMENT_UNSUPPORTED, "%s",
> + _("Post-copy migration is not supported by "
> + "source QEMU binary"));
> + }
> + ret = -1;
> + goto cleanup;
> + }
> +
> + /* Post-copy only needs to be enabled on source qemu,
> + * for target, this function only acts as a capability check */
> + if (job == QEMU_ASYNC_JOB_MIGRATION_OUT) {
> + ret = qemuMonitorSetMigrationCapability(
> + priv->mon,
> + QEMU_MONITOR_MIGRATION_CAPS_POSTCOPY);
> + }
> +
> + cleanup:
> + qemuDomainObjExitMonitor(driver, vm);
> + return ret;
> +}
Unless we need to try to set the capability to check whether it is
really available (which is not what the current code does), I think it
would make more sense to limit this function to source side only and let
destination call qemuMonitorGetMigrationCapability directly.
Empty lines missing between qemuMigrationSetPostCopy and
qemuMigrationSetCompression.
> +static int
> qemuMigrationSetCompression(virQEMUDriverPtr driver,
> virDomainObjPtr vm,
> qemuDomainAsyncJob job)
> @@ -2741,6 +2784,11 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver,
> dataFD[1] = -1; /* 'st' owns the FD now & will close it */
> }
>
> + if (flags & VIR_MIGRATE_POSTCOPY &&
> + qemuMigrationSetPostCopy(driver, vm,
> + QEMU_ASYNC_JOB_MIGRATION_IN) < 0)
> + goto stop;
> +
Just call qemuMonitorGetMigrationCapability directly here.
> if (flags & VIR_MIGRATE_COMPRESSED &&
> qemuMigrationSetCompression(driver, vm,
> QEMU_ASYNC_JOB_MIGRATION_IN) < 0)
> @@ -3583,6 +3631,18 @@ qemuMigrationRun(virQEMUDriverPtr driver,
> QEMU_ASYNC_JOB_MIGRATION_OUT) < 0)
> goto cleanup;
>
> + if (flags & VIR_MIGRATE_POSTCOPY) {
> + if (!(flags & VIR_MIGRATE_LIVE)) {
> + virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> + _("Enabling post-copy only makes sense with "
> + "live migration"));
> + goto cleanup;
> + }
> + if (qemuMigrationSetPostCopy(driver, vm,
> + QEMU_ASYNC_JOB_MIGRATION_OUT) < 0)
> + goto cleanup;
> + }
> +
> if (qemuDomainObjEnterMonitorAsync(driver, vm,
> QEMU_ASYNC_JOB_MIGRATION_OUT) < 0)
> goto cleanup;
> diff --git a/src/qemu/qemu_migration.h b/src/qemu/qemu_migration.h
> index e7a90c3..349c9c4 100644
> --- a/src/qemu/qemu_migration.h
> +++ b/src/qemu/qemu_migration.h
> @@ -41,7 +41,8 @@
> VIR_MIGRATE_COMPRESSED | \
> VIR_MIGRATE_ABORT_ON_ERROR | \
> VIR_MIGRATE_AUTO_CONVERGE | \
> - VIR_MIGRATE_RDMA_PIN_ALL)
> + VIR_MIGRATE_RDMA_PIN_ALL | \
> + VIR_MIGRATE_POSTCOPY)
>
> /* All supported migration parameters and their types. */
> # define QEMU_MIGRATION_PARAMETERS \
Jirka
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