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Re: [PATCH] Revert "evtchn: refuse EVTCHNOP_status for Xen-bound event channels"
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 3 Apr 2024 09:35:19 -0400
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- Cc: George Dunlap <George.Dunlap@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>
- Delivery-date: Wed, 03 Apr 2024 13:35:33 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 4/2/24 13:06, Andrew Cooper wrote:
The commit makes a claim without any kind of justification.
The claim is false, and the commit broke lsevtchn in dom0. It is also quite
obvious from XSM_TARGET that it has broken device model stubdoms too.
Whether to return information about a xen-owned evtchn is a matter of policy,
and it's not acceptable to short circuit the XSM on the matter.
This reverts commit f60ab5337f968e2f10c639ab59db7afb0fe4f7c3.
Fixes: f60ab5337f96 ("evtchn: refuse EVTCHNOP_status for Xen-bound event
channels")
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: George Dunlap <George.Dunlap@xxxxxxxxxx>
CC: Jan Beulich <JBeulich@xxxxxxxx>
CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
CC: Julien Grall <julien@xxxxxxx>
CC: Daniel Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>
---
xen/common/event_channel.c | 6 ------
1 file changed, 6 deletions(-)
diff --git a/xen/common/event_channel.c b/xen/common/event_channel.c
index 20f586cf5ecd..ae6c2f902645 100644
--- a/xen/common/event_channel.c
+++ b/xen/common/event_channel.c
@@ -1040,12 +1040,6 @@ int evtchn_status(evtchn_status_t *status)
read_lock(&d->event_lock);
- if ( consumer_is_xen(chn) )
- {
- rc = -EACCES;
- goto out;
- }
-
rc = xsm_evtchn_status(XSM_TARGET, d, chn);
if ( rc )
goto out;
base-commit: 7a09966e7b2823b70f6d56d0cf66c11124f4a3c1
Acked-by: Daniel P. Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>
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