kvm: Add a helper method to access device event queues

The VM's event queue is normally used for devices in multi-core KVM
mode. Add a helper method, BaseKvmCPU::deviceEventQueue(), to access
this queue. This makes the intention of code migrating to device event
queues clearer.

Change-Id: Ifb10f553a6d7445c8d562f658cf9d0b1f4c577ff
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/4287
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/cpu/kvm/base.hh b/src/cpu/kvm/base.hh
index 29872e744..a22637f98 100644
--- a/src/cpu/kvm/base.hh
+++ b/src/cpu/kvm/base.hh
@@ -419,6 +419,16 @@ class BaseKvmCPU : public BaseCPU
     void syncThreadContext();
 
     /**
+     * Get a pointer to the event queue owning devices.
+     *
+     * Devices always live in a separate device event queue when
+     * running in multi-core mode. We need to temporarily migrate to
+     * this queue when accessing devices. By convention, devices and
+     * the VM use the same event queue.
+     */
+    EventQueue *deviceEventQueue() { return vm.eventQueue(); }
+
+    /**
      * Update the KVM if the thread context is dirty.
      */
     void syncKvmState();