xen: add a dummy xc_hvm_inject_msi for Xen < 4.2

xc_hvm_inject_msi is only available on Xen >= 4.2: add a dummy
compatibility function for Xen < 4.2.

Also enable msi support only on Xen >= 4.2.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/hw/pc.c b/hw/pc.c
index 1f5aacb..4d34a33 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -916,7 +916,7 @@ static DeviceState *apic_init(void *env, uint8_t apic_id)
         msi_supported = true;
     }
 
-    if (xen_enabled()) {
+    if (xen_msi_support()) {
         msi_supported = true;
     }