[RFC][PATCH] cpu: implement CPEJ method for unpluging cpu

[Chen Fan]

After OS ejecting a vcpu successful, it will call CPEJ method,
there communicate the masked vcpu bitmap to QEMU.

Signed-off-by: Chen Fan 
---
 src/acpi-dsdt-cpu-hotplug.dsl | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/acpi-dsdt-cpu-hotplug.dsl b/src/acpi-dsdt-cpu-hotplug.dsl
index 0f3e83b..b25963c 100644
--- a/src/acpi-dsdt-cpu-hotplug.dsl
+++ b/src/acpi-dsdt-cpu-hotplug.dsl
@@ -34,7 +34,11 @@ Scope(_SB) {
     }
     Method(CPEJ, 2, NotSerialized) {
         // _EJ0 method - eject callback
-        Sleep(200)
+        Store(Zero, Index(CPON, ToInteger(Arg0)))
+        Store(One, Local0)
+        ShiftLeft(Local0, Arg0, Local0)
+        Not(Local0, Local0)
+        And(PRS, Local0, PRS)
     }

/* CPU hotplug notify method */