xen pvhvm: do not remap pirqs onto evtchns if !xen_have_vector_callback

CC: stable@kernel.org #2.6.37 and onwards
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 492ade8..d99346e 100644 (file)
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -374,7 +374,7 @@ 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