Don't route PIC interrupts through the local APIC if the local APIC

config says so. By Ari Kivity.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3371 c046a42c-6fe2-441c-8c8c-71466251a162

2 files changed, 37 insertions, 3 deletions

diff --git a/hw/apic.c b/hw/apic.c
index 9e0f4762fe..3a442bf826 100644
--- a/hw/apic.c
+++ b/hw/apic.c
@@ -484,6 +484,25 @@ int apic_get_interrupt(CPUState *env)
     return intno;
 }
 
+int apic_accept_pic_intr(CPUState *env)
+{
+    APICState *s = env->apic_state;
+    uint32_t lvt0;
+
+    if (!s)
+        return -1;
+
+    lvt0 = s->lvt[APIC_LVT_LINT0];
+
+    if (s->id == 0 &&
+        ((s->apicbase & MSR_IA32_APICBASE_ENABLE) == 0 ||
+         ((lvt0 & APIC_LVT_MASKED) == 0 &&
+          ((lvt0 >> 8) & 0x7) == APIC_DM_EXTINT)))
+        return 1;
+
+    return 0;
+}
+
 static uint32_t apic_get_current_count(APICState *s)
 {
     int64_t d;
@@ -790,6 +809,13 @@ static void apic_reset(void *opaque)
 {
     APICState *s = opaque;
     apic_init_ipi(s);
+
+    /*
+     * LINT0 delivery mode is set to ExtInt at initialization time
+     * typically by BIOS, so PIC interrupt can be delivered to the
+     * processor when local APIC is enabled.
+     */
+    s->lvt[APIC_LVT_LINT0] = 0x700;
 }
 
 static CPUReadMemoryFunc *apic_mem_read[3] = {
@@ -821,6 +847,13 @@ int apic_init(CPUState *env)
     s->apicbase = 0xfee00000 |
         (s->id ? 0 : MSR_IA32_APICBASE_BSP) | MSR_IA32_APICBASE_ENABLE;
 
+    /*
+     * LINT0 delivery mode is set to ExtInt at initialization time
+     * typically by BIOS, so PIC interrupt can be delivered to the
+     * processor when local APIC is enabled.
+     */
+    s->lvt[APIC_LVT_LINT0] = 0x700;
+
     /* XXX: mapping more APICs at the same memory location */
     if (apic_io_memory == 0) {
         /* NOTE: the APIC is directly connected to the CPU - it is not
diff --git a/hw/pc.c b/hw/pc.c
index 5bc0b63e79..c561cbf2e6 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -93,6 +93,9 @@ int cpu_get_pic_interrupt(CPUState *env)
         return intno;
     }
     /* read the irq from the PIC */
+    if (!apic_accept_pic_intr(env))
+        return -1;
+
     intno = pic_read_irq(isa_pic);
     return intno;
 }
@@ -100,10 +103,8 @@ int cpu_get_pic_interrupt(CPUState *env)
 static void pic_irq_request(void *opaque, int irq, int level)
 {
     CPUState *env = opaque;
-    if (level)
+    if (level && apic_accept_pic_intr(env))
         cpu_interrupt(env, CPU_INTERRUPT_HARD);
-    else
-        cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);
 }
 
 /* PC cmos mappings */