1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * KVM L1 hypervisor optimizations on Hyper-V for SVM. 4 */ 5 6 #include <linux/kvm_host.h> 7 8 #include <asm/mshyperv.h> 9 10 #include "svm.h" 11 #include "svm_ops.h" 12 13 #include "hyperv.h" 14 #include "kvm_onhyperv.h" 15 #include "svm_onhyperv.h" 16 17 int svm_hv_enable_direct_tlbflush(struct kvm_vcpu *vcpu) 18 { 19 struct hv_enlightenments *hve; 20 struct hv_partition_assist_pg **p_hv_pa_pg = 21 &to_kvm_hv(vcpu->kvm)->hv_pa_pg; 22 23 if (!*p_hv_pa_pg) 24 *p_hv_pa_pg = kzalloc(PAGE_SIZE, GFP_KERNEL); 25 26 if (!*p_hv_pa_pg) 27 return -ENOMEM; 28 29 hve = (struct hv_enlightenments *)to_svm(vcpu)->vmcb->control.reserved_sw; 30 31 hve->partition_assist_page = __pa(*p_hv_pa_pg); 32 hve->hv_vm_id = (unsigned long)vcpu->kvm; 33 if (!hve->hv_enlightenments_control.nested_flush_hypercall) { 34 hve->hv_enlightenments_control.nested_flush_hypercall = 1; 35 vmcb_mark_dirty(to_svm(vcpu)->vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS); 36 } 37 38 return 0; 39 } 40 41