x86/apic: Add apic->eoi_write() callback

Add eoi_write callback so that kvm can override
eoi accesses without touching the rest of the apic.
As a side-effect, this will enable a micro-optimization
for apics using msr.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Cc: Avi Kivity <avi@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: gleb@redhat.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/0df425d746c49ac2ecc405174df87752869629d2.1337184153.git.mst@redhat.com
[ tidied it up a bit ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/x86/kernel/apic/apic_flat_64.c b/arch/x86/kernel/apic/apic_flat_64.c
index 359b6899a36c..0e881c46e8c8 100644
--- a/arch/x86/kernel/apic/apic_flat_64.c
+++ b/arch/x86/kernel/apic/apic_flat_64.c
@@ -227,6 +227,7 @@ static struct apic apic_flat =  {
 
         .read                           = native_apic_mem_read,
         .write                          = native_apic_mem_write,
+        .eoi_write                      = native_apic_mem_write,
         .icr_read                       = native_apic_icr_read,
         .icr_write                      = native_apic_icr_write,
         .wait_icr_idle                  = native_apic_wait_icr_idle,
@@ -386,6 +387,7 @@ static struct apic apic_physflat =  {
 
         .read                           = native_apic_mem_read,
         .write                          = native_apic_mem_write,
+        .eoi_write                      = native_apic_mem_write,
         .icr_read                       = native_apic_icr_read,
         .icr_write                      = native_apic_icr_write,
         .wait_icr_idle                  = native_apic_wait_icr_idle,