1 files changed, 10 insertions, 1 deletions

diff --git a/arch/x86/kernel/vsmp_64.c b/arch/x86/kernel/vsmp_64.c
index f6584a90aba3..5edc34b5b951 100644
--- a/arch/x86/kernel/vsmp_64.c
+++ b/arch/x86/kernel/vsmp_64.c
@@ -26,6 +26,9 @@
 
 #define TOPOLOGY_REGISTER_OFFSET 0x10
 
+/* Flag below is initialized once during vSMP PCI initialization. */
+static int irq_routing_comply = 1;
+
 #if defined CONFIG_PCI && defined CONFIG_PARAVIRT
 /*
  * Interrupt control on vSMPowered systems:
@@ -101,6 +104,10 @@ static void __init set_vsmp_pv_ops(void)
 #ifdef CONFIG_SMP
         if (cap & ctl & BIT(8)) {
                 ctl &= ~BIT(8);
+
+                /* Interrupt routing set to ignore */
+                irq_routing_comply = 0;
+
 #ifdef CONFIG_PROC_FS
                 /* Don't let users change irq affinity via procfs */
                 no_irq_affinity = 1;
@@ -218,7 +225,9 @@ static void vsmp_apic_post_init(void)
 {
         /* need to update phys_pkg_id */
         apic->phys_pkg_id = apicid_phys_pkg_id;
-        apic->vector_allocation_domain = fill_vector_allocation_domain;
+
+        if (!irq_routing_comply)
+                apic->vector_allocation_domain = fill_vector_allocation_domain;
 }
 
 void __init vsmp_init(void)