[Xen-devel] [PATCH 1/4] VMX: Detect posted interrupt capability

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

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

Check whether the Hardware supports posted interrupt capability.

Signed-off-by: Yang Zhang <yang.z.zhang@xxxxxxxxx>
Reviewed-by: Jun Nakajima <jun.nakajima@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vmcs.c        |   12 +++++++++++-
 xen/include/asm-x86/hvm/vmx/vmcs.h |    6 ++++++
 2 files changed, 17 insertions(+), 1 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c
index 9926ffb..a88a548 100644
--- a/xen/arch/x86/hvm/vmx/vmcs.c
+++ b/xen/arch/x86/hvm/vmx/vmcs.c
@@ -92,6 +92,7 @@ static void __init vmx_display_features(void)
     P(cpu_has_vmx_unrestricted_guest, "Unrestricted Guest");
     P(cpu_has_vmx_apic_reg_virt, "APIC Register Virtualization");
     P(cpu_has_vmx_virtual_intr_delivery, "Virtual Interrupt Delivery");
+    P(cpu_has_vmx_posted_intr_processing, "Posted Interrupt Processing");
     P(cpu_has_vmx_vmcs_shadowing, "VMCS shadowing");
 #undef P
 
@@ -143,7 +144,8 @@ static int vmx_init_vmcs_config(void)
 
     min = (PIN_BASED_EXT_INTR_MASK |
            PIN_BASED_NMI_EXITING);
-    opt = PIN_BASED_VIRTUAL_NMIS;
+    opt = (PIN_BASED_VIRTUAL_NMIS |
+            PIN_BASED_POSTED_INTERRUPT);
     _vmx_pin_based_exec_control = adjust_vmx_controls(
         "Pin-Based Exec Control", min, opt,
         MSR_IA32_VMX_PINBASED_CTLS, &mismatch);
@@ -269,6 +271,14 @@ static int vmx_init_vmcs_config(void)
     _vmx_vmexit_control = adjust_vmx_controls(
         "VMExit Control", min, opt, MSR_IA32_VMX_EXIT_CTLS, &mismatch);
 
+    /*
+     * "Process posted interrupt" can be set only when "virtual-interrupt
+     * delivery" and "acknowledge interrupt on exit" is set
+     */
+    if ( !(_vmx_secondary_exec_control & SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY)
+          || !(_vmx_vmexit_control & VM_EXIT_ACK_INTR_ON_EXIT) )
+        _vmx_pin_based_exec_control  &= ~ PIN_BASED_POSTED_INTERRUPT;
+
     min = 0;
     opt = VM_ENTRY_LOAD_GUEST_PAT;
     _vmx_vmentry_control = adjust_vmx_controls(
diff --git a/xen/include/asm-x86/hvm/vmx/vmcs.h 
b/xen/include/asm-x86/hvm/vmx/vmcs.h
index 37e6734..3a5c91a 100644
--- a/xen/include/asm-x86/hvm/vmx/vmcs.h
+++ b/xen/include/asm-x86/hvm/vmx/vmcs.h
@@ -165,6 +165,7 @@ extern u32 vmx_cpu_based_exec_control;
 #define PIN_BASED_NMI_EXITING           0x00000008
 #define PIN_BASED_VIRTUAL_NMIS          0x00000020
 #define PIN_BASED_PREEMPT_TIMER         0x00000040
+#define PIN_BASED_POSTED_INTERRUPT      0x00000080
 extern u32 vmx_pin_based_exec_control;
 
 #define VM_EXIT_SAVE_DEBUG_CNTRLS       0x00000004
@@ -256,6 +257,8 @@ extern bool_t cpu_has_vmx_ins_outs_instr_info;
     (vmx_secondary_exec_control & SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY)
 #define cpu_has_vmx_virtualize_x2apic_mode \
     (vmx_secondary_exec_control & SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE)
+#define cpu_has_vmx_posted_intr_processing \
+    (vmx_pin_based_exec_control & PIN_BASED_POSTED_INTERRUPT)
 #define cpu_has_vmx_vmcs_shadowing \
     (vmx_secondary_exec_control & SECONDARY_EXEC_ENABLE_VMCS_SHADOWING)
 
@@ -280,6 +283,7 @@ extern bool_t cpu_has_vmx_ins_outs_instr_info;
 /* VMCS field encodings. */
 enum vmcs_field {
     VIRTUAL_PROCESSOR_ID            = 0x00000000,
+    POSTED_INTR_NOTIFICATION_VECTOR = 0x00000002,
     GUEST_ES_SELECTOR               = 0x00000800,
     GUEST_CS_SELECTOR               = 0x00000802,
     GUEST_SS_SELECTOR               = 0x00000804,
@@ -314,6 +318,8 @@ enum vmcs_field {
     VIRTUAL_APIC_PAGE_ADDR_HIGH     = 0x00002013,
     APIC_ACCESS_ADDR                = 0x00002014,
     APIC_ACCESS_ADDR_HIGH           = 0x00002015,
+    PI_DESC_ADDR                    = 0x00002016,
+    PI_DESC_ADDR_HIGH               = 0x00002017,
     EPT_POINTER                     = 0x0000201a,
     EPT_POINTER_HIGH                = 0x0000201b,
     EOI_EXIT_BITMAP0                = 0x0000201c,
-- 
1.7.1


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