[Xen-changelog] [PATCH] vmx-io-events.patch

[BitKeeper Bot <riel@xxxxxxxxxxx>]

ChangeSet 1.1695, 2005/06/08 09:40:39+01:00, arun.sharma@xxxxxxxxx

        [PATCH] vmx-io-events.patch
        
        - Handle the case where the VMX domains get events from ports other than
          IOPACKET_PORT (because of paravirtualized drivers)
        
        - Use clear_bit() to operate on evtchn_upcall_pending
        
        Signed-off-by: Xiaofeng Ling <xiaofeng.ling@xxxxxxxxx>
        Signed-off-by: Kevin Tian <kevin.tian@xxxxxxxxx>
        Signed-off-by: Arun Sharma <arun.sharma@xxxxxxxxx>



 vmx_io.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)


diff -Nru a/xen/arch/x86/vmx_io.c b/xen/arch/x86/vmx_io.c
--- a/xen/arch/x86/vmx_io.c     2005-06-08 06:03:12 -04:00
+++ b/xen/arch/x86/vmx_io.c     2005-06-08 06:03:12 -04:00
@@ -283,7 +283,7 @@
 
     /* Note: VMX domains may need upcalls as well */
     if (!v->vcpu_info->evtchn_pending_sel) 
-        v->vcpu_info->evtchn_upcall_pending = 0;
+        clear_bit(0, &v->vcpu_info->evtchn_upcall_pending);
 
     /* clear the pending bit for IOPACKET_PORT */
     return test_and_clear_bit(IOPACKET_PORT, 
@@ -311,10 +311,16 @@
     extern void do_block();
 
     do {
-        do_block();
+        if(!test_bit(IOPACKET_PORT, 
+            &current->domain->shared_info->evtchn_pending[0]))
+            do_block();
         vmx_check_events(current);
         if (!test_bit(ARCH_VMX_IO_WAIT, &current->arch.arch_vmx.flags))
             break;
+        /* Events other than IOPACKET_PORT might have woken us up. In that
+           case, safely go back to sleep. */
+        clear_bit(IOPACKET_PORT>>5, &current->vcpu_info->evtchn_pending_sel);
+        clear_bit(0, &current->vcpu_info->evtchn_upcall_pending);
     } while(1);
 }
 

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