[14/15] xen pvhvm: do not remap pirqs onto evtchns if !xen_have_vector_callback

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stefano Stabellini <redacted>

commit 207d543f472c1ac9552df79838dc807cbcaa9740 upstream.

Signed-off-by: Stefano Stabellini <redacted>
Signed-off-by: Konrad Rzeszutek Wilk <redacted>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/x86/pci/xen.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c

@@ -308,7 +308,7 @@ int __init pci_xen_init(void)
 
 int __init pci_xen_hvm_init(void)
 {
-	if (!xen_feature(XENFEAT_hvm_pirqs))
+	if (!xen_have_vector_callback || !xen_feature(XENFEAT_hvm_pirqs))
 		return 0;
 
 #ifdef CONFIG_ACPI