Merge remote-tracking branch 'qemu-kvm/uq/master' into staging

* qemu-kvm/uq/master:
  virtio: move common irqfd handling out of virtio-pci
  virtio: move common ioeventfd handling out of virtio-pci
  event_notifier: add event_notifier_set_handler
  memory: pass EventNotifier, not eventfd
  ivshmem: wrap ivshmem_del_eventfd loops with transaction
  ivshmem: use EventNotifier and memory API
  event_notifier: add event_notifier_init_fd
  event_notifier: remove event_notifier_test
  event_notifier: add event_notifier_set
  apic: Defer interrupt updates to VCPU thread
  apic: Reevaluate pending interrupts on LVT_LINT0 changes
  apic: Resolve potential endless loop around apic_update_irq
  kvm: expose tsc deadline timer feature to guest
  kvm_pv_eoi: add flag support
  kvm: Don't abort on kvm_irqchip_add_msi_route()

1 files changed, 22 insertions, 5 deletions

diff --git a/hw/apic.c b/hw/apic.c
index 60552df619..385555eb43 100644
--- a/hw/apic.c
+++ b/hw/apic.c
@@ -16,6 +16,7 @@
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, see <http://www.gnu.org/licenses/>
  */
+#include "qemu-thread.h"
 #include "apic_internal.h"
 #include "apic.h"
 #include "ioapic.h"
@@ -361,11 +362,10 @@ static void apic_update_irq(APICCommonState *s)
     if (!(s->spurious_vec & APIC_SV_ENABLE)) {
         return;
     }
-    if (apic_irq_pending(s) > 0) {
+    if (!qemu_cpu_is_self(s->cpu_env)) {
+        cpu_interrupt(s->cpu_env, CPU_INTERRUPT_POLL);
+    } else if (apic_irq_pending(s) > 0) {
         cpu_interrupt(s->cpu_env, CPU_INTERRUPT_HARD);
-    } else if (apic_accept_pic_intr(&s->busdev.qdev) &&
-               pic_get_output(isa_pic)) {
-        apic_deliver_pic_intr(&s->busdev.qdev, 1);
     }
 }
 
@@ -535,6 +535,15 @@ static void apic_deliver(DeviceState *d, uint8_t dest, uint8_t dest_mode,
     apic_bus_deliver(deliver_bitmask, delivery_mode, vector_num, trigger_mode);
 }
 
+static bool apic_check_pic(APICCommonState *s)
+{
+    if (!apic_accept_pic_intr(&s->busdev.qdev) || !pic_get_output(isa_pic)) {
+        return false;
+    }
+    apic_deliver_pic_intr(&s->busdev.qdev, 1);
+    return true;
+}
+
 int apic_get_interrupt(DeviceState *d)
 {
     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
@@ -560,7 +569,12 @@ int apic_get_interrupt(DeviceState *d)
     reset_bit(s->irr, intno);
     set_bit(s->isr, intno);
     apic_sync_vapic(s, SYNC_TO_VAPIC);
+
+    /* re-inject if there is still a pending PIC interrupt */
+    apic_check_pic(s);
+
     apic_update_irq(s);
+
     return intno;
 }
 
@@ -800,8 +814,11 @@ static void apic_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
         {
             int n = index - 0x32;
             s->lvt[n] = val;
-            if (n == APIC_LVT_TIMER)
+            if (n == APIC_LVT_TIMER) {
                 apic_timer_update(s, qemu_get_clock_ns(vm_clock));
+            } else if (n == APIC_LVT_LINT0 && apic_check_pic(s)) {
+                apic_update_irq(s);
+            }
         }
         break;
     case 0x38: