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Re: [PATCH v9 1/3] docs: update xenstore migration stream definition
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx, Julien Grall <julien@xxxxxxx>
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Tue, 25 Mar 2025 10:17:49 +0100
- Authentication-results: smtp-out2.suse.de; none
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>
- Delivery-date: Tue, 25 Mar 2025 09:18:00 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 14.03.25 13:18, Juergen Gross wrote:
In order to close a race window for Xenstore live update when using
the new unique_id of domains, the migration stream needs to contain
this unique_id for each domain known by Xenstore.
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
This patch is still missing an Ack.
Julien?
Juergen
---
V8:
- new patch
V9:
- instead of using an offset, use a flag for unique_id presence
(Julien Grall)
---
docs/designs/xenstore-migration.md | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)
diff --git a/docs/designs/xenstore-migration.md
b/docs/designs/xenstore-migration.md
index 082314bf72..a0acd76ce1 100644
--- a/docs/designs/xenstore-migration.md
+++ b/docs/designs/xenstore-migration.md
@@ -156,7 +156,7 @@ the domain being migrated.
```
0 1 2 3 4 5 6 7 octet
+-------+-------+-------+-------+-------+-------+-------+-------+
-| conn-id | conn-type | |
+| conn-id | conn-type | fields |
+-------------------------------+---------------+---------------+
| conn-spec
...
@@ -165,6 +165,9 @@ the domain being migrated.
+---------------+---------------+-------------------------------+
| data
...
++---------------------------------------------------------------+
+| unique-id |
++---------------------------------------------------------------+
```
@@ -178,6 +181,16 @@ the domain being migrated.
| | 0x0001: socket |
| | 0x0002 - 0xFFFF: reserved for future use |
| | |
+| `fields` | A collection of flags indicating presence |
+| | of additional fields after the variable |
+| | length `data` part. The additional fields |
+| | will start after a possible padding for |
+| | aligning to a 8 octet boundary. |
+| | Defined flag values (to be or-ed): |
+| | 0x0001: `unique_id` present (only needed for |
+| | `shared ring` connection in live |
+| | update streams). |
+| | |
| `conn-spec` | See below |
| | |
| `in-data-len` | The length (in octets) of any data read |
@@ -193,6 +206,9 @@ the domain being migrated.
| `data` | Pending data: first in-data-len octets of |
| | read data, then out-data-len octets of |
| | written data (any of both may be empty) |
+| | |
+| `unique-id` | Unique identifier of a domain |
+| | |
In case of live update the connection record for the connection via which
the live update command was issued will contain the response for the live
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