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>
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index 26719aa..c3bde75 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -980,7 +980,8 @@
#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 @@
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 @@
[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 =