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Re: [PATCH v9 2/3] tools/xenstored: use unique_id to identify new domain with same domid
- To: Jason Andryuk <jason.andryuk@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Jürgen Groß <jgross@xxxxxxxx>
- Date: Fri, 14 Mar 2025 14:22:05 +0100
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- Cc: Julien Grall <julien@xxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>
- Delivery-date: Fri, 14 Mar 2025 13:22:27 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 14.03.25 13:58, Jason Andryuk wrote:
On 2025-03-14 08:18, Juergen Gross wrote:
Use the new unique_id of a domain in order to detect that a domain
has been replaced with another one reusing the doamin-id of the old
domain.
While changing the related code, switch from "dom_invalid" to
"dom_valid" in order to avoid double negation and use "bool" as type
for it.
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
V8:
- new patch
V9:
- adapt to different LU-record layout
- "dom_invalid" -> "dom_valid" (Jason Andryuk)
Thanks.
Reviewed-by: Jason Andryuk <jason.andryuk@xxxxxxx>
One thought below.
---
tools/xenstored/domain.c | 65 ++++++++++++++++++++++++++------
tools/xenstored/xenstore_state.h | 3 +-
2 files changed, 55 insertions(+), 13 deletions(-)
diff --git a/tools/xenstored/domain.c b/tools/xenstored/domain.c
index a6506a5bb2..fc0992d3a5 100644
--- a/tools/xenstored/domain.c
+++ b/tools/xenstored/domain.c
@@ -1778,6 +1811,14 @@ void read_state_connection(const void *ctx, const void
*state)
conn->conn_id = sc->conn_id;
read_state_buffered_data(ctx, conn, sc);
+
+ /* Validity of unique_id will be tested by check_domains() later. */
+ if ((sc->fields & XS_STATE_CONN_FIELDS_UNIQ_ID) && domain) {
Is it worth adding a sanity check for the other bits in sc->fields == 0?
Definitely not. Unknown flags can be ignored, they should never result
in an error. Otherwise LU to an older Xenstore might not be possible
any longer.
And a check domain != NULL when XS_STATE_CONN_FIELDS_UNIQ_ID is set?
No, I don't think so. Failing a LU due to such a case would inhibit the
possibility to fix such a bug using LU.
Juergen
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