1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * KVM L1 hypervisor optimizations on Hyper-V for SVM. 4 */ 5 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 6 7 #include <linux/kvm_host.h> 8 9 #include <asm/mshyperv.h> 10 11 #include "svm.h" 12 #include "svm_ops.h" 13 14 #include "hyperv.h" 15 #include "kvm_onhyperv.h" 16 #include "svm_onhyperv.h" 17 18 int svm_hv_enable_l2_tlb_flush(struct kvm_vcpu *vcpu) 19 { 20 struct hv_vmcb_enlightenments *hve; 21 struct hv_partition_assist_pg **p_hv_pa_pg = 22 &to_kvm_hv(vcpu->kvm)->hv_pa_pg; 23 24 if (!*p_hv_pa_pg) 25 *p_hv_pa_pg = kzalloc(PAGE_SIZE, GFP_KERNEL); 26 27 if (!*p_hv_pa_pg) 28 return -ENOMEM; 29 30 hve = &to_svm(vcpu)->vmcb->control.hv_enlightenments; 31 32 hve->partition_assist_page = __pa(*p_hv_pa_pg); 33 hve->hv_vm_id = (unsigned long)vcpu->kvm; 34 if (!hve->hv_enlightenments_control.nested_flush_hypercall) { 35 hve->hv_enlightenments_control.nested_flush_hypercall = 1; 36 vmcb_mark_dirty(to_svm(vcpu)->vmcb, HV_VMCB_NESTED_ENLIGHTENMENTS); 37 } 38 39 return 0; 40 } 41 42