HV: implement wbinvd instruction emulation

wbinvd is used to write back all modified cache lines in the processor's
internal cache to main memory and invalidates(flushes) the internal caches.

Using clflushopt instructions to emulate wbinvd to flush each
guest vm memory, if CLFLUSHOPT is not supported, boot will fail.

Signed-off-by: Jack Ren <jack.ren@intel.com>
Signed-off-by: Yuan Liu <yuan1.liu@intel.com>
Reviewed-by: Li, Fei1 <fei1.li@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

Author: yliu80

hypervisor/arch/x86/guest/vmexit.c

@@ -347,8 +347,10 @@ static int32_t xsetbv_vmexit_handler(struct acrn_vcpu *vcpu)
 
 static int32_t wbinvd_vmexit_handler(struct acrn_vcpu *vcpu)
 {
-	if (!iommu_snoop_supported(vcpu->vm->iommu)) {
+	if (has_rt_vm() == false) {
 		cache_flush_invalidate_all();
+	} else {
+		walk_ept_table(vcpu->vm, ept_flush_leaf_page);
 	}
 
 	return 0;