[Xen-devel] [PATCH v4 10/11] nested vmx: fix interrupt delivery to L2 guest

[Dongxiao Xu <dongxiao.xu@xxxxxxxxx>]

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>
---
 xen/arch/x86/hvm/vmx/intr.c |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/intr.c b/xen/arch/x86/hvm/vmx/intr.c
index 3961bc7..ef8b925 100644
--- a/xen/arch/x86/hvm/vmx/intr.c
+++ b/xen/arch/x86/hvm/vmx/intr.c
@@ -163,7 +163,7 @@ enum hvm_intblk nvmx_intr_blocked(struct vcpu *v)
 
 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 vcpu *v, struct 
hvm_intack intack)
         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);
-- 
1.7.1


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