[Xen-devel] [PATCH 2/4] 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                    |    6 ++++++
 xen/arch/x86/hvm/vmx/vmx.c                     |   11 +++++++++++
 xen/include/asm-x86/hvm/vmx/vmcs.h             |    7 +++++++
 xen/include/asm-x86/mach-default/irq_vectors.h |    3 ++-
 4 files changed, 26 insertions(+), 1 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c
index a88a548..fb1be8d 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_INTERRUPT_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 a869ed4..fba9998 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -1500,6 +1500,13 @@ static struct hvm_function_table __read_mostly 
vmx_function_table = {
     .nhvm_hap_walk_L1_p2m = nvmx_hap_walk_L1_p2m,
 };
 
+static void posted_interrupt_handler(struct cpu_user_regs *regs)
+{
+    ack_APIC_irq();
+    perfc_incr(ipis);
+    this_cpu(irq_count)++;
+}
+
 struct hvm_function_table * __init start_vmx(void)
 {
     set_in_cr4(X86_CR4_VMXE);
@@ -1524,6 +1531,10 @@ struct hvm_function_table * __init start_vmx(void)
         setup_ept_dump();
     }
 
+    if ( cpu_has_vmx_posted_intr_processing )
+        set_direct_apic_vector(POSTED_INTERRUPT_VECTOR,
+                posted_interrupt_handler);
+
     setup_vmcs_dump();
 
     return &vmx_function_table;
diff --git a/xen/include/asm-x86/hvm/vmx/vmcs.h 
b/xen/include/asm-x86/hvm/vmx/vmcs.h
index 3a5c91a..1825a19 100644
--- a/xen/include/asm-x86/hvm/vmx/vmcs.h
+++ b/xen/include/asm-x86/hvm/vmx/vmcs.h
@@ -73,6 +73,12 @@ struct vmx_domain {
     unsigned long apic_access_mfn;
 };
 
+struct pi_desc {
+    u32 pir[8];
+    u32 control;
+    u32 rsvd[7];
+} __attribute__ ((packed, 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 +119,7 @@ struct arch_vmx_struct {
 
     uint32_t             eoi_exitmap_changed;
     uint64_t             eoi_exit_bitmap[4];
+    struct pi_desc      pi_desc;
 
     unsigned long        host_cr0;
 
diff --git a/xen/include/asm-x86/mach-default/irq_vectors.h 
b/xen/include/asm-x86/mach-default/irq_vectors.h
index 992e00c..34c2f44 100644
--- a/xen/include/asm-x86/mach-default/irq_vectors.h
+++ b/xen/include/asm-x86/mach-default/irq_vectors.h
@@ -9,12 +9,13 @@
 #define CALL_FUNCTION_VECTOR   0xfb
 #define LOCAL_TIMER_VECTOR     0xfa
 #define PMU_APIC_VECTOR        0xf9
+#define POSTED_INTERRUPT_VECTOR        0xf8
 /*
  * High-priority dynamically-allocated vectors. For interrupts that
  * must be higher priority than any guest-bound interrupt.
  */
 #define FIRST_HIPRIORITY_VECTOR        0xf1
-#define LAST_HIPRIORITY_VECTOR  0xf8
+#define LAST_HIPRIORITY_VECTOR  0xf7
 /* IRQ0 (timer) is statically allocated but must be high priority. */
 #define IRQ0_VECTOR             0xf0
 
-- 
1.7.1


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