[Xen-devel] [PATCH] xen: do not remap pirqs if !is_hvm_pv_evtchn_domain

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

If the guest is an HVM guest and it is not using the vector callback
mechanism, refuse to remap pirqs onto event channels.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Tested-by: Paulian Bogdan Marinca <paulian@xxxxxxxxxxx>

diff --git a/xen/arch/x86/physdev.c b/xen/arch/x86/physdev.c
index f280c28..2173097 100644
--- a/xen/arch/x86/physdev.c
+++ b/xen/arch/x86/physdev.c
@@ -93,6 +93,11 @@ int physdev_map_pirq(domid_t domid, int type, int *index, 
int *pirq_p,
 
     if ( domid == DOMID_SELF && is_hvm_domain(d) )
     {
+        if ( !is_hvm_pv_evtchn_domain(d) )
+        {
+            ret = -EINVAL;
+            goto free_domain;
+        }
         ret = physdev_hvm_map_pirq(d, type, index, pirq_p);
         goto free_domain;
     }

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