[Qemu-devel] [PATCH 5/5] migration: disable RDMA WRITR after postcopy started.

[Lidong Chen]

RDMA write operations are performed with no notification to the destination
qemu, then the destination qemu can not wakeup. So disable RDMA WRITE after
postcopy started.

Signed-off-by: Lidong Chen <address@hidden>
---
 migration/qemu-file.c |  3 ++-
 migration/rdma.c      | 12 ++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/migration/qemu-file.c b/migration/qemu-file.c
index 8acb574..a64ac3a 100644
--- a/migration/qemu-file.c
+++ b/migration/qemu-file.c
@@ -260,7 +260,8 @@ size_t ram_control_save_page(QEMUFile *f, ram_addr_t 
block_offset,
         int ret = f->hooks->save_page(f, f->opaque, block_offset,
                                       offset, size, bytes_sent);
         f->bytes_xfer += size;
-        if (ret != RAM_SAVE_CONTROL_DELAYED) {
+        if (ret != RAM_SAVE_CONTROL_DELAYED &&
+            ret != RAM_SAVE_CONTROL_NOT_SUPP) {
             if (bytes_sent && *bytes_sent > 0) {
                 qemu_update_position(f, *bytes_sent);
             } else if (ret < 0) {
diff --git a/migration/rdma.c b/migration/rdma.c
index 81be482..8529ddd 100644
--- a/migration/rdma.c
+++ b/migration/rdma.c
@@ -2964,6 +2964,10 @@ static size_t qemu_rdma_save_page(QEMUFile *f, void 
*opaque,
 
     CHECK_ERROR_STATE();
 
+    if (migrate_get_current()->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
+        return RAM_SAVE_CONTROL_NOT_SUPP;
+    }
+
     qemu_fflush(f);
 
     if (size > 0) {
@@ -3528,6 +3532,10 @@ static int qemu_rdma_registration_start(QEMUFile *f, 
void *opaque,
 
     CHECK_ERROR_STATE();
 
+    if (migrate_get_current()->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
+        return 0;
+    }
+
     trace_qemu_rdma_registration_start(flags);
     qemu_put_be64(f, RAM_SAVE_FLAG_HOOK);
     qemu_fflush(f);
@@ -3550,6 +3558,10 @@ static int qemu_rdma_registration_stop(QEMUFile *f, void 
*opaque,
 
     CHECK_ERROR_STATE();
 
+    if (migrate_get_current()->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
+        return 0;
+    }
+
     qemu_fflush(f);
     ret = qemu_rdma_drain_cq(f, rdma);
 
-- 
1.8.3.1