Re: [libvirt] [PATCH] qemu: Avoid assigning unavailable migration ports

From: WangYufei <james.wangyufei(a)huawei.com&gt; https://bugzilla.redhat.com/show_bug.cgi?id=1019053 When we migrate vms concurrently, there's a chance that libvirtd on destination assigns the same port for different migrations, which will lead to migration failure during prepare phase on destination. So we use virPortAllocator here to solve the problem. Signed-off-by: WangYufei <james.wangyufei(a)huawei.com&gt; Signed-off-by: Jiri Denemark <jdenemar(a)redhat.com&gt; --- src/qemu/qemu_command.h | 3 +++ src/qemu/qemu_conf.h | 6 +++--- src/qemu/qemu_domain.h | 1 + src/qemu/qemu_driver.c | 6 ++++++ src/qemu/qemu_migration.c | 39 +++++++++++++++++++++++++-------------- 5 files changed, 38 insertions(+), 17 deletions(-)

diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c index 38edadb..a77aeb7 100644 --- a/src/qemu/qemu_migration.c +++ b/src/qemu/qemu_migration.c @@ -2550,8 +2556,8 @@ qemuMigrationPrepareDirect(virQEMUDriverPtr driver, * to be a correct hostname which refers to the target machine). */ if (uri_in == NULL) { - this_port = QEMUD_MIGRATION_FIRST_PORT + port++; - if (port == QEMUD_MIGRATION_NUM_PORTS) port = 0; + if (virPortAllocatorAcquire(driver->migrationPorts, &port) < 0) + goto cleanup; /* Get hostname */ if ((hostname = virGetHostname()) == NULL)

@@ -2607,16 +2613,16 @@ qemuMigrationPrepareDirect(virQEMUDriverPtr driver, if (uri->port == 0) { /* Generate a port */ - this_port = QEMUD_MIGRATION_FIRST_PORT + port++; - if (port == QEMUD_MIGRATION_NUM_PORTS) - port = 0; + if (virPortAllocatorAcquire(driver->migrationPorts, &port) < 0) + goto cleanup;