diff mbox series

[v3,1/6] tools/cpupools: Give a name to unnamed cpupools

Message ID 20220318152541.7460-2-luca.fancellu@arm.com (mailing list archive)
State Superseded
Headers show
Series Boot time cpupools | expand

Commit Message

Luca Fancellu March 18, 2022, 3:25 p.m. UTC 
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@arm.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
---
Changes in v3:
- no changes, add R-by
Changes in v2:
 - Remove unused variable, moved xc_cpupool_infofree
   ahead to simplify the code, use asprintf (Juergen)
---
 tools/helpers/xen-init-dom0.c  | 35 +++++++++++++++++++++++++++++++++-
 tools/libs/light/libxl_utils.c |  3 +--
 2 files changed, 35 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/tools/helpers/xen-init-dom0.c b/tools/helpers/xen-init-dom0.c
index c99224a4b607..84286617790f 100644
--- a/tools/helpers/xen-init-dom0.c
+++ b/tools/helpers/xen-init-dom0.c
@@ -43,7 +43,9 @@  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, *pool_name;
+    xc_cpupoolinfo_t *xcinfo;
+    unsigned int pool_id = 0;
     libxl_uuid uuid;
 
     /* Accept 0 or 1 argument */
@@ -114,6 +116,37 @@  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_err;
+            }
+            pool_id++;
+            if (!xs_write(xsh, XBT_NULL, pool_path, pool_name,
+                          strlen(pool_name))) {
+                fprintf(stderr, "cannot set pool name\n");
+                rc = 1;
+            }
+            free(pool_name);
+out_err:
+            free(pool_path);
+            if ( rc )
+                goto out;
+        }
+    } while(xcinfo != NULL);
+
     printf("Done setting up Dom0\n");
 
 out:
diff --git a/tools/libs/light/libxl_utils.c b/tools/libs/light/libxl_utils.c
index b91c2cafa223..81780da3ff40 100644
--- a/tools/libs/light/libxl_utils.c
+++ b/tools/libs/light/libxl_utils.c
@@ -151,8 +151,7 @@  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;
 }