[Xen-devel] [RFC v2 05/15] vmx: Initialize VT-d Posted-Interrupts Descriptor

[Feng Wu <feng.wu@xxxxxxxxx>]

This patch initializes the VT-d Posted-interrupt Descriptor.

Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vmcs.c       |  3 +++
 xen/include/asm-x86/hvm/vmx/vmx.h | 20 +++++++++++++++++++-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c
index 63007a9..f60a454 100644
--- a/xen/arch/x86/hvm/vmx/vmcs.c
+++ b/xen/arch/x86/hvm/vmx/vmcs.c
@@ -1004,6 +1004,9 @@ static int construct_vmcs(struct vcpu *v)
 
     if ( cpu_has_vmx_posted_intr_processing )
     {
+        if ( iommu_intpost )
+            pi_desc_init(v);
+
         __vmwrite(PI_DESC_ADDR, virt_to_maddr(&v->arch.hvm_vmx.pi_desc));
         __vmwrite(POSTED_INTR_NOTIFICATION_VECTOR, posted_intr_vector);
     }
diff --git a/xen/include/asm-x86/hvm/vmx/vmx.h 
b/xen/include/asm-x86/hvm/vmx/vmx.h
index 91c5e18..e4292cc 100644
--- a/xen/include/asm-x86/hvm/vmx/vmx.h
+++ b/xen/include/asm-x86/hvm/vmx/vmx.h
@@ -28,6 +28,9 @@
 #include <asm/hvm/support.h>
 #include <asm/hvm/trace.h>
 #include <asm/hvm/vmx/vmcs.h>
+#include <asm/apic.h>
+
+extern uint8_t posted_intr_vector;
 
 typedef union {
     struct {
@@ -125,6 +128,22 @@ static inline unsigned long pi_get_pir(struct pi_desc 
*pi_desc, int group)
     return xchg(&pi_desc->pir[group], 0);
 }
 
+#define PI_xAPIC_NDST_MASK   0xFF00
+
+static inline void pi_desc_init(struct vcpu *v)
+{
+    uint32_t dest;
+
+    v->arch.hvm_vmx.pi_desc.nv = posted_intr_vector;
+
+    dest = cpu_physical_id(v->processor);
+
+    if ( x2apic_enabled )
+        v->arch.hvm_vmx.pi_desc.ndst = dest;
+    else
+        v->arch.hvm_vmx.pi_desc.ndst = MASK_INSR(dest, PI_xAPIC_NDST_MASK);
+}
+
 /*
  * Exit Reasons
  */
@@ -244,7 +263,6 @@ static inline unsigned long pi_get_pir(struct pi_desc 
*pi_desc, int group)
 #define MODRM_EAX_ECX   ".byte 0xc1\n" /* EAX, ECX */
 
 extern u64 vmx_ept_vpid_cap;
-extern uint8_t posted_intr_vector;
 
 #define cpu_has_vmx_ept_exec_only_supported        \
     (vmx_ept_vpid_cap & VMX_EPT_EXEC_ONLY_SUPPORTED)
-- 
2.1.0


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