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 static int svm_hv_enable_l2_tlb_flush(struct kvm_vcpu *vcpu) 19 { 20 struct hv_vmcb_enlightenments *hve; 21 hpa_t partition_assist_page = hv_get_partition_assist_page(vcpu); 22 23 if (partition_assist_page == INVALID_PAGE) 24 return -ENOMEM; 25 26 hve = &to_svm(vcpu)->vmcb->control.hv_enlightenments; 27 28 hve->partition_assist_page = partition_assist_page; 29 hve->hv_vm_id = (unsigned long)vcpu->kvm; 30 if (!hve->hv_enlightenments_control.nested_flush_hypercall) { 31 hve->hv_enlightenments_control.nested_flush_hypercall = 1; 32 vmcb_mark_dirty(to_svm(vcpu)->vmcb, HV_VMCB_NESTED_ENLIGHTENMENTS); 33 } 34 35 return 0; 36 } 37 38 __init void svm_hv_hardware_setup(void) 39 { 40 if (npt_enabled && 41 ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB) { 42 pr_info(KBUILD_MODNAME ": Hyper-V enlightened NPT TLB flush enabled\n"); 43 svm_x86_ops.flush_remote_tlbs = hv_flush_remote_tlbs; 44 svm_x86_ops.flush_remote_tlbs_range = hv_flush_remote_tlbs_range; 45 } 46 47 if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) { 48 int cpu; 49 50 pr_info(KBUILD_MODNAME ": Hyper-V Direct TLB Flush enabled\n"); 51 for_each_online_cpu(cpu) { 52 struct hv_vp_assist_page *vp_ap = 53 hv_get_vp_assist_page(cpu); 54 55 if (!vp_ap) 56 continue; 57 58 vp_ap->nested_control.features.directhypercall = 1; 59 } 60 svm_x86_ops.enable_l2_tlb_flush = 61 svm_hv_enable_l2_tlb_flush; 62 } 63 } 64