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Re: [PATCH] xenstore-paths: Allow subnet prefix in IP address
- To: Jan Beulich <jbeulich@xxxxxxxx>, Tu Dinh <ngoc-tu.dinh@xxxxxxxxxx>
- From: Jürgen Groß <jgross@xxxxxxxx>
- Date: Wed, 22 Jul 2026 10:49:09 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 22 Jul 2026 08:49:31 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 22.07.26 09:14, Jan Beulich wrote:
On 08.06.2026 11:49, Tu Dinh wrote:
In the guest-reported IP address in xenstore, it's useful to know which
subnet it belongs to.
Add a specification for the IPv6 host address/prefix format specified by
RFC 4291.
For the IPv4 address/prefix notation, as there seems to be no equivalent
RFC specifying the host address/prefix format, specify it ourselves.
Signed-off-by: Tu Dinh <ngoc-tu.dinh@xxxxxxxxxx>
Btw, even if get_maintainer.pl doesn't say so, it would help to Cc the
maintainer of the component the doc for which is being modified.
Indeed.
I'm sharing Teddy's concerns. We just don't know who are potential consumers
of those Xenstore nodes. I know of at least three large SUSE customers using
Xen having written tooling accessing Xenstore.
What about adding another node for the prefix, like
~/attr/vif/$DEVID/ipv4/$INDEX/prefix = INTEGER
Juergen
Jan
--- a/docs/misc/xenstore-paths.pandoc
+++ b/docs/misc/xenstore-paths.pandoc
@@ -78,12 +78,12 @@ VALUES are strings and can take the following forms:
* MAC_ADDRESS -- 6 integers, in hexadecimal form, separated by ':',
specifying an IEEE 802.3 ethernet MAC address.
-* IPV4_ADDRESS -- 4 integers, in decimal form, separated by '.',
- specifying an IP version 4 address as described
- IETF RFC 791.
-* IPV6_ADDRESS -- Up to 8 integers, in hexadecimal form, separated
- by ':', specifying an IP version 6 address as
- described in IETF RFC 4291.
+* IPV4_ADDRESS -- An IP version 4 address as specified by IETF RFC 791,
+ optionally appended with a "/prefix" value representing the
+ prefix length of the host address's subnet, with "prefix"
+ being a decimal integer in the range of 0 to 32.
+* IPV6_ADDRESS -- An IP version 6 address or abbreviated "address/prefix"
+ combination as specified by IETF RFC 4291 and RFC 5952.
Additional TAGS may follow as a comma separated set of the following
tags enclosed in square brackets.
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