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xen: Expect xenstore write to fail when restricted 

Saving the current state to xenstore may fail when running restricted
(in particular, after a migration). Therefore, don't report the error or
exit when running restricted.  Toolstacks that want to allow running
QEMU restricted should instead make use of QMP events to listen for
state changes.

CC: Ian Jackson <ian.jackson@eu.citrix.com>
Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Reviewed-by: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>
This commit is contained in:
Ross Lagerwall 2018-03-05 10:07:46 +00:00 committed by Ian Jackson
parent 1c4010fa09
commit 4473348adf
1 changed files with 6 additions and 1 deletions
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7
hw/xen/xen-common.c
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@ -101,7 +101,12 @@ static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
}
snprintf(path, sizeof (path), "device-model/%u/state", xen_domid);
if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) {
/*
* This call may fail when running restricted so don't make it fatal in
* that case. Toolstacks should instead use QMP to listen for state changes.
*/
if (!xs_write(xs, XBT_NULL, path, state, strlen(state)) &&
!xen_domid_restrict) {
error_report("error recording dm state");
exit(1);
}