[Xen-changelog] [xen-unstable] nested vmx: fix interrupt delivery to L2 guest

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
# Date 1354813139 0
# Node ID 90831c29bfde6aac013b7e5ec98934a4953c31c9
# Parent  25dd352265ca23750f1a1a983124b36f518c4384
nested vmx: fix interrupt delivery to L2 guest

While delivering interrupt into L2 guest, L0 hypervisor need to check
whether L1 hypervisor wants to own the interrupt, if not, directly
inject the interrupt into L2 guest.

Signed-off-by: Xiantao Zhang <xiantao.zhang@xxxxxxxxx>
Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Committed-by: Keir Fraser <keir@xxxxxxx>
---


diff -r 25dd352265ca -r 90831c29bfde xen/arch/x86/hvm/vmx/intr.c
--- a/xen/arch/x86/hvm/vmx/intr.c       Thu Dec 06 16:58:23 2012 +0000
+++ b/xen/arch/x86/hvm/vmx/intr.c       Thu Dec 06 16:58:59 2012 +0000
@@ -163,7 +163,7 @@ enum hvm_intblk nvmx_intr_blocked(struct
 
 static int nvmx_intr_intercept(struct vcpu *v, struct hvm_intack intack)
 {
-    u32 exit_ctrl;
+    u32 ctrl;
 
     if ( nvmx_intr_blocked(v) != hvm_intblk_none )
     {
@@ -176,11 +176,14 @@ static int nvmx_intr_intercept(struct vc
         if ( intack.source == hvm_intsrc_pic ||
                  intack.source == hvm_intsrc_lapic )
         {
+            ctrl = __get_vvmcs(vcpu_nestedhvm(v).nv_vvmcx, 
PIN_BASED_VM_EXEC_CONTROL);
+            if ( !(ctrl & PIN_BASED_EXT_INTR_MASK) )
+                return 0;
+
             vmx_inject_extint(intack.vector);
 
-            exit_ctrl = __get_vvmcs(vcpu_nestedhvm(v).nv_vvmcx,
-                            VM_EXIT_CONTROLS);
-            if ( exit_ctrl & VM_EXIT_ACK_INTR_ON_EXIT )
+            ctrl = __get_vvmcs(vcpu_nestedhvm(v).nv_vvmcx, VM_EXIT_CONTROLS);
+            if ( ctrl & VM_EXIT_ACK_INTR_ON_EXIT )
             {
                 /* for now, duplicate the ack path in vmx_intr_assist */
                 hvm_vcpu_ack_pending_irq(v, intack);

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