xl: don't use libxl allocator for vcpu_list

This also fixes a bug with an erroneous call to libxl_free().
A destructor for the vcpu list is also implemented which is called from
xl.

Signed-off-by: Gianni Tedesco <gianni.tedesco@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 3f08f85394b1135d7f752d582d35ba056ab6cc64..cdff9f3b638a18827428b231c77ace72106f1153 100644 (file)
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -2722,6 +2722,8 @@ libxl_vcpuinfo *libxl_list_vcpu(libxl_ctx *ctx, uint32_t domid,
     xc_domaininfo_t domaininfo;
     xc_vcpuinfo_t vcpuinfo;
     xc_physinfo_t physinfo = { 0 };
+    uint64_t *cpumaps;
+    unsigned num_cpuwords;
 
     if (xc_domain_getinfolist(ctx->xch, domid, 1, &domaininfo) != 1) {
         XL_LOG_ERRNO(ctx, XL_LOG_ERROR, "getting infolist");
@@ -2732,14 +2734,15 @@ libxl_vcpuinfo *libxl_list_vcpu(libxl_ctx *ctx, uint32_t domid,
         return NULL;
     }
     *nrcpus = physinfo.max_cpu_id + 1;
-    ptr = libxl_calloc(ctx, domaininfo.max_vcpu_id + 1, sizeof (libxl_vcpuinfo));
+    ret = ptr = calloc(domaininfo.max_vcpu_id + 1, sizeof (libxl_vcpuinfo));
     if (!ptr) {
         return NULL;
     }
 
-    ret = ptr;
+    num_cpuwords = ((physinfo.max_cpu_id + 64) / 64);
+    cpumaps = calloc(num_cpuwords * sizeof(*cpumaps), domaininfo.max_vcpu_id + 1);
     for (*nb_vcpu = 0; *nb_vcpu <= domaininfo.max_vcpu_id; ++*nb_vcpu, ++ptr) {
-        ptr->cpumap = libxl_calloc(ctx, (*nrcpus + 63) / 64, sizeof (uint64_t));
+        ptr->cpumap = cpumaps + (num_cpuwords * *nb_vcpu);
         if (!ptr->cpumap) {
             return NULL;
         }
@@ -2762,6 +2765,13 @@ libxl_vcpuinfo *libxl_list_vcpu(libxl_ctx *ctx, uint32_t domid,
     return ret;
 }
 
+void libxl_free_vcpu_list(libxl_vcpuinfo *vcpu)
+{
+    if ( vcpu )
+        free(vcpu[0].cpumap);
+    free(vcpu);
+}
+
 int libxl_set_vcpuaffinity(libxl_ctx *ctx, uint32_t domid, uint32_t vcpuid,
                            uint64_t *cpumap, int nrcpus)
 {

diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index 2529f9948633c583f722ce73c0e14d3cabb9160b..5d513a711ca35b66ce1807eb15aa30aa63b6ee26 100644 (file)
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -598,6 +598,7 @@ typedef struct {
 int libxl_get_physinfo(libxl_ctx *ctx, libxl_physinfo *physinfo);
 libxl_vcpuinfo *libxl_list_vcpu(libxl_ctx *ctx, uint32_t domid,
                                        int *nb_vcpu, int *nrcpus);
+void libxl_free_vcpu_list(libxl_vcpuinfo *vcpu);
 int libxl_set_vcpuaffinity(libxl_ctx *ctx, uint32_t domid, uint32_t vcpuid,
                            uint64_t *cpumap, int nrcpus);
 int libxl_set_vcpucount(libxl_ctx *ctx, uint32_t domid, uint32_t count);

diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index c99c495dfe4fe147c464e6cc35800fb7b6f5963e..ca2d7f74c70dff75bd75377620f7a0f0789d6c4e 100644 (file)
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -3268,7 +3268,7 @@ static void print_vcpuinfo(uint32_t tdomid,
 void vcpulist(int argc, char **argv)
 {
     libxl_dominfo *dominfo;
-    libxl_vcpuinfo *vcpuinfo;
+    libxl_vcpuinfo *vcpuinfo, *list = NULL;
     libxl_physinfo physinfo;
     int nb_vcpu, nb_domain, nrcpus;
 
@@ -3284,7 +3284,7 @@ void vcpulist(int argc, char **argv)
             goto vcpulist_out;
         }
         for (; nb_domain > 0; --nb_domain, ++dominfo) {
-            if (!(vcpuinfo = libxl_list_vcpu(&ctx, dominfo->domid, &nb_vcpu,
+            if (!(list = vcpuinfo = libxl_list_vcpu(&ctx, dominfo->domid, &nb_vcpu,
                 &nrcpus))) {
                 fprintf(stderr, "libxl_list_vcpu failed.\n");
                 goto vcpulist_out;
@@ -3292,19 +3292,21 @@ void vcpulist(int argc, char **argv)
             for (; nb_vcpu > 0; --nb_vcpu, ++vcpuinfo) {
                 print_vcpuinfo(dominfo->domid, vcpuinfo, physinfo.nr_cpus);
             }
+            libxl_free_vcpu_list(list);
         }
     } else {
         for (; argc > 0; ++argv, --argc) {
             if (domain_qualifier_to_domid(*argv, &domid, 0) < 0) {
                 fprintf(stderr, "%s is an invalid domain identifier\n", *argv);
             }
-            if (!(vcpuinfo = libxl_list_vcpu(&ctx, domid, &nb_vcpu, &nrcpus))) {
+            if (!(list = vcpuinfo = libxl_list_vcpu(&ctx, domid, &nb_vcpu, &nrcpus))) {
                 fprintf(stderr, "libxl_list_vcpu failed.\n");
                 goto vcpulist_out;
             }
             for (; nb_vcpu > 0; --nb_vcpu, ++vcpuinfo) {
                 print_vcpuinfo(domid, vcpuinfo, physinfo.nr_cpus);
             }
+            libxl_free_vcpu_list(list);
         }
     }
   vcpulist_out: