[PATCH for-4.7, 4.6] libxl: do not assume Dom0 backend while getting nic info

[PATCH for-4.7, 4.6] libxl: do not assume Dom0 backend while getting nic info

[Marek Marczykowski-Górecki]

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Fill backend_domid field based on backend path.

Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
---
 tools/libxl/libxl.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index e1ab6ec..9a888a1 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -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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Re: [PATCH for-4.7, 4.6] libxl: do not assume Dom0 backend while getting nic info

[Ian Jackson]

Marek Marczykowski-Górecki writes ("[PATCH for-4.7,4.6] libxl: do not assume Dom0 backend while getting nic info"):
> Fill backend_domid field based on backend path.

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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Re: [PATCH for-4.7, 4.6] libxl: do not assume Dom0 backend while getting nic info

[Ian Jackson]

Ian Jackson writes ("Re: [PATCH for-4.7,4.6] libxl: do not assume Dom0 backend while getting nic info"):
> Marek Marczykowski-Górecki writes ("[PATCH for-4.7,4.6] libxl: do not assume Dom0 backend while getting nic info"):
> > Fill backend_domid field based on backend path.
> 
> Thanks.  I've put this in my queue, which I'm processing now.  (That
> patch has been in master for a while now.)

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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