libxl: do not assume Dom0 backend while getting nic info

Fill backend_domid field based on backend path.

---
 tools/libxl/libxl.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

index e1ab6ec..9a888a1 100644
@@ -3601,6 +3601,18 @@ static int libxl__device_nic_from_xenstore(libxl__gc *gc,
     else
         nic->devid = 0;
 
+    rc = libxl__xs_read_checked(gc, XBT_NULL,
+                                GCSPRINTF("%s/backend", libxl_path), &tmp);
+    if (rc) goto out;
+
+    if (!tmp) {
+        LOG(ERROR, "nic %s does not exist (no backend path)", libxl_path);
+        rc = ERROR_FAIL;
+        goto out;
+    }
+    rc = libxl__backendpath_parse_domid(gc, tmp, &nic->backend_domid);
+    if (rc) goto out;
+
     /* nic->mtu = */
 
     tmp = READ_LIBXLDEV(gc, "mac");

2.5.5

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Marek Marczykowski-Górecki writes ("[PATCH for-4.7,4.6] libxl: do not assume Dom0 backend while getting nic info"):

Thanks. I've put this in my queue, which I'm processing now. (That patch has been in master for a while now.)

Ian.

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Ian Jackson writes ("Re: [PATCH for-4.7,4.6] libxl: do not assume Dom0 backend while getting nic info"):

I have backported this to 4.7 and 4.6. It applies cleanly to 4.5 but since the purpose is to enable driver domains, and 4.5 is very old (out of bugfix support even), I don't propose to apply it there.

Thanks,
Ian.

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