[PATCH 1/3] evtchn/hvm: do not allow binding PIRQs unless supported

[Roger Pau Monne]

HVM (or PVH) domain not having PIRQ support won't be allowed to map PIRQs in
the first place, but would still be allowed usage of
EVTCHNOP_bind_pirq. Such hypercall won't have any practical effect on
the domain, as the event channels would never be bound to PIRQs.

Signed-off-by: Roger Pau Monné <roger....@citrix.com>
---
 xen/common/event_channel.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/common/event_channel.c b/xen/common/event_channel.c
index ffb042a241..bc4985706a 100644
--- a/xen/common/event_channel.c
+++ b/xen/common/event_channel.c
@@ -556,6 +556,9 @@ static int evtchn_bind_pirq(evtchn_bind_pirq_t *bind)
     int            port = 0, rc;
     unsigned int   pirq = bind->pirq;
 
+    if ( is_hvm_domain(d) && !has_pirq(d) )
+        return -ENOSYS;
+
     if ( pirq >= d->nr_pirqs )
         return -EINVAL;
 
-- 
2.34.1