KVM: VMX: wbinvd exiting

Add wbinvd VM Exit support to prepare for pass-through
device cache emulation and also enhance real time
responsiveness.

Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

2 files changed, 12 insertions, 1 deletions

diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index 26719aa9701e..c3bde7532714 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -980,7 +980,8 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
 #endif
         if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) {
                 min = 0;
-                opt = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
+                opt = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
+                        SECONDARY_EXEC_WBINVD_EXITING;
                 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS2,
                                         &_cpu_based_2nd_exec_control) < 0)
                         return -EIO;
@@ -2133,6 +2134,13 @@ static int handle_vmcall(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
         return 1;
 }
 
+static int handle_wbinvd(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+        skip_emulated_instruction(vcpu);
+        /* TODO: Add support for VT-d/pass-through device */
+        return 1;
+}
+
 static int handle_apic_access(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 {
         u64 exit_qualification;
@@ -2174,6 +2182,7 @@ static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu,
         [EXIT_REASON_VMCALL]                  = handle_vmcall,
         [EXIT_REASON_TPR_BELOW_THRESHOLD]     = handle_tpr_below_threshold,
         [EXIT_REASON_APIC_ACCESS]             = handle_apic_access,
+        [EXIT_REASON_WBINVD]                  = handle_wbinvd,
 };
 
 static const int kvm_vmx_max_exit_handlers =
diff --git a/drivers/kvm/vmx.h b/drivers/kvm/vmx.h
index 6d32bc69285e..d52ae8d7303d 100644
--- a/drivers/kvm/vmx.h
+++ b/drivers/kvm/vmx.h
@@ -49,6 +49,7 @@
  * Definitions of Secondary Processor-Based VM-Execution Controls.
  */
 #define SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES 0x00000001
+#define SECONDARY_EXEC_WBINVD_EXITING           0x00000040
 
 
 #define PIN_BASED_EXT_INTR_MASK                 0x00000001
@@ -223,6 +224,7 @@ enum vmcs_field {
 #define EXIT_REASON_MWAIT_INSTRUCTION   36
 #define EXIT_REASON_TPR_BELOW_THRESHOLD 43
 #define EXIT_REASON_APIC_ACCESS         44
+#define EXIT_REASON_WBINVD              54
 
 /*
  * Interruption-information format