VMX: Turn on posted interrupt bit in vmcs

Turn on posted interrupt for vcpu if posted interrupt is avaliable.

Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com>
Reviewed-by: Jun Nakajima <jun.nakajima@intel.com>
Acked-by: Keir Fraser <keir@xen.org>
Acked-by: George Dunlap <george.dunlap@eu.citrix.com> (from a release perspective)

2 files changed, 11 insertions, 0 deletions

diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c
index d634d488e6..ef0ee7f836 100644
--- a/xen/arch/x86/hvm/vmx/vmcs.c
+++ b/xen/arch/x86/hvm/vmx/vmcs.c
@@ -926,6 +926,12 @@ static int construct_vmcs(struct vcpu *v)
         __vmwrite(GUEST_INTR_STATUS, 0);
     }
 
+    if ( cpu_has_vmx_posted_intr_processing )
+    {
+        __vmwrite(PI_DESC_ADDR, virt_to_maddr(&v->arch.hvm_vmx.pi_desc));
+        __vmwrite(POSTED_INTR_NOTIFICATION_VECTOR, posted_intr_vector);
+    }
+
     /* Host data selectors. */
     __vmwrite(HOST_SS_SELECTOR, __HYPERVISOR_DS);
     __vmwrite(HOST_DS_SELECTOR, __HYPERVISOR_DS);
diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index e36dbcbad1..0aa4b8293e 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -75,6 +75,8 @@ static int vmx_msr_read_intercept(unsigned int msr, uint64_t *msr_content);
 static int vmx_msr_write_intercept(unsigned int msr, uint64_t msr_content);
 static void vmx_invlpg_intercept(unsigned long vaddr);
 
+uint8_t __read_mostly posted_intr_vector;
+
 static int vmx_domain_initialise(struct domain *d)
 {
     int rc;
@@ -1521,6 +1523,9 @@ struct hvm_function_table * __init start_vmx(void)
 
         setup_ept_dump();
     }
+ 
+    if ( cpu_has_vmx_posted_intr_processing )
+        alloc_direct_apic_vector(&posted_intr_vector, event_check_interrupt);
 
     setup_vmcs_dump();