[kvm-devel] Add WBINVD exit support

[Dong, E. <edd...@in...>]

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

    Signed-off-by: Yaozu (Eddie) Dong <edd...@in...>
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index 6fc981d..6d80a41 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -972,7 +972,8 @@ static __init int setup_vmcs_config(struct
vmcs_config *vmcs_conf)
 #endif
 	if (_cpu_based_exec_control &
CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) {
 		min =3D 0;
-		opt =3D SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
+		opt =3D 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;
@@ -2164,6 +2165,13 @@ static int handle_vmcall(struct kvm_vcpu *vcpu,
struct kvm_run *kvm_run)
 	return 1;
 }
=20
+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;
@@ -2205,6 +2213,7 @@ static int (*kvm_vmx_exit_handlers[])(struct
kvm_vcpu *vcpu,
 	[EXIT_REASON_VMCALL]                  =3D handle_vmcall,
 	[EXIT_REASON_TPR_BELOW_THRESHOLD]     =3D
handle_tpr_below_threshold,
 	[EXIT_REASON_APIC_ACCESS]             =3D handle_apic_access,
+	[EXIT_REASON_WBINVD]                  =3D handle_wbinvd,
 };
=20
 static const int kvm_vmx_max_exit_handlers =3D
diff --git a/drivers/kvm/vmx.h b/drivers/kvm/vmx.h
index 2ea35b9..5159374 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
=20
=20
 #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
=20
 /*
  * Interruption-information format