[Xen-devel] [RFC v1 14/15] Suppress posting interrupts when 'SN' is set

[Feng Wu <feng.wu@xxxxxxxxx>]

Currently, we don't support urgent interrupt, all interrupts
are recognized as non-urgent interrupt, so we cannot send
posted-interrupt when 'SN' is set.

Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vmx.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index 6323bd6..40c7b0e 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -1663,9 +1663,20 @@ static void __vmx_deliver_posted_interrupt(struct vcpu 
*v)
 
 static void vmx_deliver_posted_intr(struct vcpu *v, u8 vector)
 {
+    int r, sn;
+
     if ( pi_test_and_set_pir(vector, &v->arch.hvm_vmx.pi_desc) )
         return;
 
+    /*
+     * Currently, we don't support urgent interrupt, all interrupts
+     * are recognized as non-urgent interrupt, so we cannot send
+     * posted-interrupt when 'SN' is set.
+     */
+
+    sn = pi_test_sn(&v->arch.hvm_vmx.pi_desc);
+    r = pi_test_and_set_on(&v->arch.hvm_vmx.pi_desc);
+
     if ( unlikely(v->arch.hvm_vmx.eoi_exitmap_changed) )
     {
         /*
@@ -1675,7 +1686,7 @@ static void vmx_deliver_posted_intr(struct vcpu *v, u8 
vector)
          */
         pi_set_on(&v->arch.hvm_vmx.pi_desc);
     }
-    else if ( !pi_test_and_set_on(&v->arch.hvm_vmx.pi_desc) )
+    else if ( !r && !sn )
     {
         __vmx_deliver_posted_interrupt(v);
         return;
-- 
2.1.0


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