[xen staging] tools/cpupools: Give a name to unnamed cpupools

[patchbot@xxxxxxx]

commit 5b9647f771ce0a80c4de4eeaa55f6cf07a5d1f64
Author:     Luca Fancellu <luca.fancellu@xxxxxxx>
AuthorDate: Fri May 6 13:00:06 2022 +0100
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
CommitDate: Mon May 9 13:32:05 2022 -0700

    tools/cpupools: Give a name to unnamed cpupools
    
    With the introduction of boot time cpupools, Xen can create many
    different cpupools at boot time other than cpupool with id 0.
    
    Since these newly created cpupools can't have an
    entry in Xenstore, create the entry using xen-init-dom0
    helper with the usual convention: Pool-<cpupool id>.
    
    Given the change, remove the check for poolid == 0 from
    libxl_cpupoolid_to_name(...).
    
    Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>
    Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 tools/helpers/xen-init-dom0.c  | 37 ++++++++++++++++++++++++++++++++++++-
 tools/libs/light/libxl_utils.c |  3 +--
 2 files changed, 37 insertions(+), 3 deletions(-)

diff --git a/tools/helpers/xen-init-dom0.c b/tools/helpers/xen-init-dom0.c
index c99224a4b6..37eff8868f 100644
--- a/tools/helpers/xen-init-dom0.c
+++ b/tools/helpers/xen-init-dom0.c
@@ -43,7 +43,10 @@ int main(int argc, char **argv)
     int rc;
     struct xs_handle *xsh = NULL;
     xc_interface *xch = NULL;
-    char *domname_string = NULL, *domid_string = NULL;
+    char *domname_string = NULL, *domid_string = NULL,
+         *pool_path = NULL, *pool_name = NULL;
+    xc_cpupoolinfo_t *xcinfo;
+    unsigned int pool_id = 0;
     libxl_uuid uuid;
 
     /* Accept 0 or 1 argument */
@@ -114,9 +117,41 @@ int main(int argc, char **argv)
         goto out;
     }
 
+    /* Create an entry in xenstore for each cpupool on the system */
+    do {
+        xcinfo = xc_cpupool_getinfo(xch, pool_id);
+        if (xcinfo != NULL) {
+            if (xcinfo->cpupool_id != pool_id)
+                pool_id = xcinfo->cpupool_id;
+            xc_cpupool_infofree(xch, xcinfo);
+            if (asprintf(&pool_path, "/local/pool/%d/name", pool_id) <= 0) {
+                fprintf(stderr, "cannot allocate memory for pool path\n");
+                rc = 1;
+                goto out;
+            }
+            if (asprintf(&pool_name, "Pool-%d", pool_id) <= 0) {
+                fprintf(stderr, "cannot allocate memory for pool name\n");
+                rc = 1;
+                goto out;
+            }
+            pool_id++;
+            if (!xs_write(xsh, XBT_NULL, pool_path, pool_name,
+                          strlen(pool_name))) {
+                fprintf(stderr, "cannot set pool name\n");
+                rc = 1;
+                goto out;
+            }
+            free(pool_name);
+            free(pool_path);
+            pool_path = pool_name = NULL;
+        }
+    } while(xcinfo != NULL);
+
     printf("Done setting up Dom0\n");
 
 out:
+    free(pool_path);
+    free(pool_name);
     free(domid_string);
     free(domname_string);
     xs_close(xsh);
diff --git a/tools/libs/light/libxl_utils.c b/tools/libs/light/libxl_utils.c
index 1d8a7f64ef..e5e6b2da96 100644
--- a/tools/libs/light/libxl_utils.c
+++ b/tools/libs/light/libxl_utils.c
@@ -146,8 +146,7 @@ char *libxl_cpupoolid_to_name(libxl_ctx *ctx, uint32_t 
poolid)
 
     snprintf(path, sizeof(path), "/local/pool/%d/name", poolid);
     s = xs_read(ctx->xsh, XBT_NULL, path, &len);
-    if (!s && (poolid == 0))
-        return strdup("Pool-0");
+
     return s;
 }
 
--
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