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[Xen-devel] [PATCH v3 5/5] libxl: only issue cpu-add call to QEMU for not present CPU



Calculate the final bitmap for CPUs to add to avoid having annoying
error messages complaining those CPUs are already present.

We can also properly handle error from QMP now.

Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>

v3:
1. Add Anthony's Reviewed-by tag.
---
 tools/libxl/libxl.c | 39 +++++++++++++++++++++++++++++----------
 1 file changed, 29 insertions(+), 10 deletions(-)

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index b748bf1..0e2c15a 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -5753,19 +5753,38 @@ static int libxl__set_vcpuonline_qmp(libxl__gc *gc, 
uint32_t domid,
                                      libxl_bitmap *cpumap,
                                      const libxl_dominfo *info)
 {
-    int i;
+    int i, rc;
+    libxl_bitmap current_map, final_map;
+
+    libxl_bitmap_init(&current_map);
+    libxl_bitmap_init(&final_map);
+
+    libxl_bitmap_alloc(CTX, &current_map, info->vcpu_max_id + 1);
+    libxl_bitmap_set_none(&current_map);
+    rc = libxl__qmp_query_cpus(gc, domid, &current_map);
+    if (rc) {
+        LOG(ERROR, "failed to query cpus for domain %d", domid);
+        goto out;
+    }
+
+    libxl_bitmap_copy_alloc(CTX, &final_map, cpumap);
 
-    for (i = 0; i <= info->vcpu_max_id; i++) {
-        if (libxl_bitmap_test(cpumap, i)) {
-            /* Return value is ignore because it does not tell anything useful
-             * on the completion of the command.
-             * (For instance, "CPU already plugged-in" give the same return
-             * value as "command not supported".)
-             */
-            libxl__qmp_cpu_add(gc, domid, i);
+    libxl_for_each_set_bit(i, current_map)
+        libxl_bitmap_reset(&final_map, i);
+
+    libxl_for_each_set_bit(i, final_map) {
+        rc = libxl__qmp_cpu_add(gc, domid, i);
+        if (rc) {
+            LOG(ERROR, "failed to add cpu %d to domain %d", i, domid);
+            goto out;
         }
     }
-    return 0;
+
+    rc = 0;
+out:
+    libxl_bitmap_dispose(&current_map);
+    libxl_bitmap_dispose(&final_map);
+    return rc;
 }
 
 int libxl_set_vcpuonline(libxl_ctx *ctx, uint32_t domid, libxl_bitmap *cpumap)
-- 
2.1.4


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