[RFC PATCH 2/4] libxl: Introduce CPU status map interface

[Teddy Astie <teddy.astie@xxxxxxxxxx>]

Introduce a way to query CPU status map (online, present, possible)
using the newly introduced XEN_SYSCTL_get_cpu_status_map operation.

Signed-off-by: Teddy Astie <teddy.astie@xxxxxxxxxx>
---
 tools/include/libxl.h            | 11 +++++++++
 tools/libs/light/libxl.c         | 39 ++++++++++++++++++++++++++++++++
 tools/libs/light/libxl_types.idl |  6 +++++
 3 files changed, 56 insertions(+)

diff --git a/tools/include/libxl.h b/tools/include/libxl.h
index 7c098edab6..08a2df7fc3 100644
--- a/tools/include/libxl.h
+++ b/tools/include/libxl.h
@@ -1536,6 +1536,14 @@ void libxl_mac_copy(libxl_ctx *ctx, libxl_mac *dst, 
const libxl_mac *src);
  */
 #define LIBXL_HAVE_XEN_PLATFORM_PCI_BAR_UC
 
+/*
+ * LIBXL_HAVE_CPU_STATUS_MAP
+ *
+ * If this is defined, libxl_get_cpu_status_map() is available to query CPUs
+ * status map (online, present, possible).
+ */
+#define LIBXL_HAVE_CPU_STATUS_MAP
+
 /*
  * LIBXL_HAVE_XENSTORE_QUOTA
  *
@@ -2191,6 +2199,9 @@ void libxl_pcitopology_list_free(libxl_pcitopology *, int 
num_devs);
 libxl_numainfo *libxl_get_numainfo(libxl_ctx *ctx, int *nr);
 void libxl_numainfo_list_free(libxl_numainfo *, int nr);
 
+libxl_cpu_status_map *libxl_get_cpu_status_map(libxl_ctx *ctx, int *nr);
+void libxl_cpu_status_map_free(libxl_cpu_status_map *);
+
 libxl_vcpuinfo *libxl_list_vcpu(libxl_ctx *ctx, uint32_t domid,
                                 int *nb_vcpu, int *nr_cpus_out);
 void libxl_vcpuinfo_list_free(libxl_vcpuinfo *, int nr_vcpus);
diff --git a/tools/libs/light/libxl.c b/tools/libs/light/libxl.c
index a1fe16274d..6d4b2cf4f4 100644
--- a/tools/libs/light/libxl.c
+++ b/tools/libs/light/libxl.c
@@ -546,6 +546,45 @@ libxl_numainfo *libxl_get_numainfo(libxl_ctx *ctx, int *nr)
     return ret;
 }
 
+libxl_cpu_status_map *libxl_get_cpu_status_map(libxl_ctx *ctx, int *nr)
+{
+    GC_INIT(ctx);
+    libxl_cpu_status_map *ret = NULL;
+
+    ret = libxl__zalloc(NOGC, sizeof(*ret));
+
+    *nr = xc_get_max_cpus(ctx->xch);
+    if (*nr < 0) {
+        LOGE(ERROR, "getting max_cpus");
+        goto out;
+    }
+
+    libxl_bitmap_alloc(ctx, &ret->cpu_online_map, *nr);
+    libxl_bitmap_alloc(ctx, &ret->cpu_present_map, *nr);
+    libxl_bitmap_alloc(ctx, &ret->cpu_possible_map, *nr);
+
+    if (xc_get_cpu_status_map(ctx->xch, *nr,
+                              ret->cpu_online_map.map,
+                              ret->cpu_present_map.map,
+                              ret->cpu_possible_map.map)) {
+        LOGE(ERROR, "getting cpu_status_map");
+        goto out;
+    }
+
+out:
+    GC_FREE;
+    return ret;
+}
+
+void libxl_cpu_status_map_free(libxl_cpu_status_map *cpu_status_map)
+{
+    libxl_bitmap_dispose(&cpu_status_map->cpu_online_map);
+    libxl_bitmap_dispose(&cpu_status_map->cpu_possible_map);
+    libxl_bitmap_dispose(&cpu_status_map->cpu_present_map);
+
+    free(cpu_status_map);
+}
+
 const libxl_version_info* libxl_get_version_info(libxl_ctx *ctx)
 {
     GC_INIT(ctx);
diff --git a/tools/libs/light/libxl_types.idl b/tools/libs/light/libxl_types.idl
index a7893460f0..33b81d93c8 100644
--- a/tools/libs/light/libxl_types.idl
+++ b/tools/libs/light/libxl_types.idl
@@ -1276,6 +1276,12 @@ libxl_pcitopology = Struct("pcitopology", [
     ("node", uint32),
     ], dir=DIR_OUT)
 
+libxl_cpu_status_map = Struct("cpu_status_map", [
+    ("cpu_online_map",   libxl_bitmap),
+    ("cpu_present_map",  libxl_bitmap),
+    ("cpu_possible_map", libxl_bitmap),
+])
+
 libxl_sched_credit_params = Struct("sched_credit_params", [
     ("tslice_ms", integer),
     ("ratelimit_us", integer),
-- 
2.55.0



--
Teddy Astie | Vates XCP-ng Developer

XCP-ng & Xen Orchestra - Vates solutions

web: https://vates.tech