arch/x86/kvm/svm/svm_onhyperv.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * KVM L1 hypervisor optimizations on Hyper-V for SVM.
   4  */
   5
   6 #ifndef __ARCH_X86_KVM_SVM_ONHYPERV_H__
   7 #define __ARCH_X86_KVM_SVM_ONHYPERV_H__
   8
   9 #include <asm/mshyperv.h>
  10
  11 #if IS_ENABLED(CONFIG_HYPERV)
  12
  13 #include "kvm_onhyperv.h"
  14 #include "svm/hyperv.h"
  15
  16 static struct kvm_x86_ops svm_x86_ops;
  17
  18 int svm_hv_enable_l2_tlb_flush(struct kvm_vcpu *vcpu);
  19
  20 static inline bool svm_hv_is_enlightened_tlb_enabled(struct kvm_vcpu *vcpu)
  21 {
  22         struct hv_vmcb_enlightenments *hve = &to_svm(vcpu)->vmcb->control.hv_enlightenments;
  23
  24         return ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB &&
  25                !!hve->hv_enlightenments_control.enlightened_npt_tlb;
  26 }
  27
  28 static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
  29 {
  30         struct hv_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments;
  31
  32         BUILD_BUG_ON(sizeof(vmcb->control.hv_enlightenments) !=
  33                      sizeof(vmcb->control.reserved_sw));
  34
  35         if (npt_enabled &&
  36             ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB)
  37                 hve->hv_enlightenments_control.enlightened_npt_tlb = 1;
  38
  39         if (ms_hyperv.nested_features & HV_X64_NESTED_MSR_BITMAP)
  40                 hve->hv_enlightenments_control.msr_bitmap = 1;
  41 }
  42
  43 static inline __init void svm_hv_hardware_setup(void)
  44 {
  45         if (npt_enabled &&
  46             ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB) {
  47                 pr_info(KBUILD_MODNAME ": Hyper-V enlightened NPT TLB flush enabled\n");
  48                 svm_x86_ops.tlb_remote_flush = hv_remote_flush_tlb;
  49                 svm_x86_ops.tlb_remote_flush_with_range =
  50                                 hv_remote_flush_tlb_with_range;
  51         }
  52
  53         if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) {
  54                 int cpu;
  55
  56                 pr_info(KBUILD_MODNAME ": Hyper-V Direct TLB Flush enabled\n");
  57                 for_each_online_cpu(cpu) {
  58                         struct hv_vp_assist_page *vp_ap =
  59                                 hv_get_vp_assist_page(cpu);
  60
  61                         if (!vp_ap)
  62                                 continue;
  63
  64                         vp_ap->nested_control.features.directhypercall = 1;
  65                 }
  66                 svm_x86_ops.enable_l2_tlb_flush =
  67                                 svm_hv_enable_l2_tlb_flush;
  68         }
  69 }
  70
  71 static inline void svm_hv_vmcb_dirty_nested_enlightenments(
  72                 struct kvm_vcpu *vcpu)
  73 {
  74         struct vmcb *vmcb = to_svm(vcpu)->vmcb;
  75         struct hv_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments;
  76
  77         if (hve->hv_enlightenments_control.msr_bitmap)
  78                 vmcb_mark_dirty(vmcb, HV_VMCB_NESTED_ENLIGHTENMENTS);
  79 }
  80
  81 static inline void svm_hv_update_vp_id(struct vmcb *vmcb, struct kvm_vcpu *vcpu)
  82 {
  83         struct hv_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments;
  84         u32 vp_index = kvm_hv_get_vpindex(vcpu);
  85
  86         if (hve->hv_vp_id != vp_index) {
  87                 hve->hv_vp_id = vp_index;
  88                 vmcb_mark_dirty(vmcb, HV_VMCB_NESTED_ENLIGHTENMENTS);
  89         }
  90 }
  91 #else
  92
  93 static inline bool svm_hv_is_enlightened_tlb_enabled(struct kvm_vcpu *vcpu)
  94 {
  95         return false;
  96 }
  97
  98 static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
  99 {
 100 }
 101
 102 static inline __init void svm_hv_hardware_setup(void)
 103 {
 104 }
 105
 106 static inline void svm_hv_vmcb_dirty_nested_enlightenments(
 107                 struct kvm_vcpu *vcpu)
 108 {
 109 }
 110
 111 static inline void svm_hv_update_vp_id(struct vmcb *vmcb,
 112                 struct kvm_vcpu *vcpu)
 113 {
 114 }
 115 #endif /* CONFIG_HYPERV */
 116
 117 #endif /* __ARCH_X86_KVM_SVM_ONHYPERV_H__ */