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 #if IS_ENABLED(CONFIG_HYPERV)
  10
  11 #include "kvm_onhyperv.h"
  12 #include "svm/hyperv.h"
  13
  14 static struct kvm_x86_ops svm_x86_ops;
  15
  16 int svm_hv_enable_direct_tlbflush(struct kvm_vcpu *vcpu);
  17
  18 static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
  19 {
  20         struct hv_enlightenments *hve =
  21                 (struct hv_enlightenments *)vmcb->control.reserved_sw;
  22
  23         if (npt_enabled &&
  24             ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB)
  25                 hve->hv_enlightenments_control.enlightened_npt_tlb = 1;
  26
  27         if (ms_hyperv.nested_features & HV_X64_NESTED_MSR_BITMAP)
  28                 hve->hv_enlightenments_control.msr_bitmap = 1;
  29 }
  30
  31 static inline void svm_hv_hardware_setup(void)
  32 {
  33         if (npt_enabled &&
  34             ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB) {
  35                 pr_info("kvm: Hyper-V enlightened NPT TLB flush enabled\n");
  36                 svm_x86_ops.tlb_remote_flush = hv_remote_flush_tlb;
  37                 svm_x86_ops.tlb_remote_flush_with_range =
  38                                 hv_remote_flush_tlb_with_range;
  39         }
  40
  41         if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) {
  42                 int cpu;
  43
  44                 pr_info("kvm: Hyper-V Direct TLB Flush enabled\n");
  45                 for_each_online_cpu(cpu) {
  46                         struct hv_vp_assist_page *vp_ap =
  47                                 hv_get_vp_assist_page(cpu);
  48
  49                         if (!vp_ap)
  50                                 continue;
  51
  52                         vp_ap->nested_control.features.directhypercall = 1;
  53                 }
  54                 svm_x86_ops.enable_direct_tlbflush =
  55                                 svm_hv_enable_direct_tlbflush;
  56         }
  57 }
  58
  59 static inline void svm_hv_vmcb_dirty_nested_enlightenments(
  60                 struct kvm_vcpu *vcpu)
  61 {
  62         struct vmcb *vmcb = to_svm(vcpu)->vmcb;
  63         struct hv_enlightenments *hve =
  64                 (struct hv_enlightenments *)vmcb->control.reserved_sw;
  65
  66         if (hve->hv_enlightenments_control.msr_bitmap)
  67                 vmcb_mark_dirty(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS);
  68 }
  69
  70 static inline void svm_hv_update_vp_id(struct vmcb *vmcb,
  71                 struct kvm_vcpu *vcpu)
  72 {
  73         struct hv_enlightenments *hve =
  74                 (struct hv_enlightenments *)vmcb->control.reserved_sw;
  75         u32 vp_index = kvm_hv_get_vpindex(vcpu);
  76
  77         if (hve->hv_vp_id != vp_index) {
  78                 hve->hv_vp_id = vp_index;
  79                 vmcb_mark_dirty(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS);
  80         }
  81 }
  82 #else
  83
  84 static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
  85 {
  86 }
  87
  88 static inline void svm_hv_hardware_setup(void)
  89 {
  90 }
  91
  92 static inline void svm_hv_vmcb_dirty_nested_enlightenments(
  93                 struct kvm_vcpu *vcpu)
  94 {
  95 }
  96
  97 static inline void svm_hv_update_vp_id(struct vmcb *vmcb,
  98                 struct kvm_vcpu *vcpu)
  99 {
 100 }
 101 #endif /* CONFIG_HYPERV */
 102
 103 #endif /* __ARCH_X86_KVM_SVM_ONHYPERV_H__ */