[Xen-devel] [PATCH v3 2/5] VMX: Turn on posted interrupt bit in vmcs

[Yang Zhang <yang.z.zhang@xxxxxxxxx>]

From: Yang Zhang <yang.z.zhang@xxxxxxxxx>

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

Signed-off-by: Yang Zhang <yang.z.zhang@xxxxxxxxx>
Reviewed-by: Jun Nakajima <jun.nakajima@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vmcs.c        |    8 ++++++++
 xen/arch/x86/hvm/vmx/vmx.c         |    5 +++++
 xen/include/asm-x86/hvm/vmx/vmcs.h |    8 ++++++++
 3 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c
index a88a548..1eee551 100644
--- a/xen/arch/x86/hvm/vmx/vmcs.c
+++ b/xen/arch/x86/hvm/vmx/vmcs.c
@@ -76,6 +76,8 @@ static DEFINE_PER_CPU(bool_t, vmxon);
 
 static u32 vmcs_revision_id __read_mostly;
 
+extern uint8_t posted_intr_vector;
+
 static void __init vmx_display_features(void)
 {
     int printed = 0;
@@ -926,6 +928,12 @@ 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 e36dbcb..43f9d52 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 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();
 
diff --git a/xen/include/asm-x86/hvm/vmx/vmcs.h 
b/xen/include/asm-x86/hvm/vmx/vmcs.h
index 3a5c91a..f30e5ac 100644
--- a/xen/include/asm-x86/hvm/vmx/vmcs.h
+++ b/xen/include/asm-x86/hvm/vmx/vmcs.h
@@ -21,6 +21,7 @@
 
 #include <asm/hvm/io.h>
 #include <asm/hvm/vpmu.h>
+#include <irq_vectors.h>
 
 extern void vmcs_dump_vcpu(struct vcpu *v);
 extern void setup_vmcs_dump(void);
@@ -73,6 +74,12 @@ struct vmx_domain {
     unsigned long apic_access_mfn;
 };
 
+struct pi_desc {
+    DECLARE_BITMAP(pir, NR_VECTORS);
+    u32 control;
+    u32 rsvd[7];
+} __attribute__ ((aligned (64)));
+
 #define ept_get_wl(ept)   ((ept)->ept_wl)
 #define ept_get_asr(ept)  ((ept)->asr)
 #define ept_get_eptp(ept) ((ept)->eptp)
@@ -113,6 +120,7 @@ struct arch_vmx_struct {
 
     uint32_t             eoi_exitmap_changed;
     uint64_t             eoi_exit_bitmap[4];
+    struct pi_desc       pi_desc;
 
     unsigned long        host_cr0;
 
-- 
1.7.1


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