1 files changed, 11 insertions, 1 deletions

diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c
index 819b748a33f..8d10c063d7f 100644
--- a/arch/x86/kvm/i8259.c
+++ b/arch/x86/kvm/i8259.c
@@ -363,10 +363,20 @@ static void pic_ioport_write(void *opaque, u32 addr, u32 val)
                 }
         } else
                 switch (s->init_state) {
-                case 0:         /* normal mode */
+                case 0: { /* normal mode */
+                        u8 imr_diff = s->imr ^ val,
+                                off = (s == &s->pics_state->pics[0]) ? 0 : 8;
                         s->imr = val;
+                        for (irq = 0; irq < PIC_NUM_PINS/2; irq++)
+                                if (imr_diff & (1 << irq))
+                                        kvm_fire_mask_notifiers(
+                                                s->pics_state->kvm,
+                                                SELECT_PIC(irq + off),
+                                                irq + off,
+                                                !!(s->imr & (1 << irq)));
                         pic_update_irq(s->pics_state);
                         break;
+                }
                 case 1:
                         s->irq_base = val & 0xf8;
                         s->init_state = 2;