1 files changed, 24 insertions, 0 deletions

diff --git a/arch/x86_64/kernel/genapic_flat.c b/arch/x86_64/kernel/genapic_flat.c
index 50ad153eaac4..0dfc223c1839 100644
--- a/arch/x86_64/kernel/genapic_flat.c
+++ b/arch/x86_64/kernel/genapic_flat.c
@@ -22,6 +22,20 @@ static cpumask_t flat_target_cpus(void)
         return cpu_online_map;
 }
 
+static cpumask_t flat_vector_allocation_domain(int cpu)
+{
+        /* Careful. Some cpus do not strictly honor the set of cpus
+         * specified in the interrupt destination when using lowest
+         * priority interrupt delivery mode.
+         *
+         * In particular there was a hyperthreading cpu observed to
+         * deliver interrupts to the wrong hyperthread when only one
+         * hyperthread was specified in the interrupt desitination.
+         */
+        cpumask_t domain = { { [0] = APIC_ALL_CPUS, } };
+        return domain;
+}
+
 /*
  * Set up the logical destination ID.
  *
@@ -121,6 +135,7 @@ struct genapic apic_flat =  {
         .int_delivery_mode = dest_LowestPrio,
         .int_dest_mode = (APIC_DEST_LOGICAL != 0),
         .target_cpus = flat_target_cpus,
+        .vector_allocation_domain = flat_vector_allocation_domain,
         .apic_id_registered = flat_apic_id_registered,
         .init_apic_ldr = flat_init_apic_ldr,
         .send_IPI_all = flat_send_IPI_all,
@@ -141,6 +156,14 @@ static cpumask_t physflat_target_cpus(void)
         return cpumask_of_cpu(0);
 }
 
+static cpumask_t physflat_vector_allocation_domain(int cpu)
+{
+        cpumask_t domain = CPU_MASK_NONE;
+        cpu_set(cpu, domain);
+        return domain;
+}
+
+
 static void physflat_send_IPI_mask(cpumask_t cpumask, int vector)
 {
         send_IPI_mask_sequence(cpumask, vector);
@@ -179,6 +202,7 @@ struct genapic apic_physflat =  {
         .int_delivery_mode = dest_Fixed,
         .int_dest_mode = (APIC_DEST_PHYSICAL != 0),
         .target_cpus = physflat_target_cpus,
+        .vector_allocation_domain = physflat_vector_allocation_domain,
         .apic_id_registered = flat_apic_id_registered,
         .init_apic_ldr = flat_init_apic_ldr,/*not needed, but shouldn't hurt*/
         .send_IPI_all = physflat_send_IPI_all,