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_l2_tlb_flush(struct kvm_vcpu *vcpu);
  17
  18 static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
  19 {
  20         struct hv_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments;
  21
  22         BUILD_BUG_ON(sizeof(vmcb->control.hv_enlightenments) !=
  23                      sizeof(vmcb->control.reserved_sw));
  24
  25         if (npt_enabled &&
  26             ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB)
  27                 hve->hv_enlightenments_control.enlightened_npt_tlb = 1;
  28
  29         if (ms_hyperv.nested_features & HV_X64_NESTED_MSR_BITMAP)
  30                 hve->hv_enlightenments_control.msr_bitmap = 1;
  31 }
  32
  33 static inline __init void svm_hv_hardware_setup(void)
  34 {
  35         if (npt_enabled &&
  36             ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB) {
  37                 pr_info(KBUILD_MODNAME ": Hyper-V enlightened NPT TLB flush enabled\n");
  38                 svm_x86_ops.tlb_remote_flush = hv_remote_flush_tlb;
  39                 svm_x86_ops.tlb_remote_flush_with_range =
  40                                 hv_remote_flush_tlb_with_range;
  41         }
  42
  43         if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) {
  44                 int cpu;
  45
  46                 pr_info(KBUILD_MODNAME ": Hyper-V Direct TLB Flush enabled\n");
  47                 for_each_online_cpu(cpu) {
  48                         struct hv_vp_assist_page *vp_ap =
  49                                 hv_get_vp_assist_page(cpu);
  50
  51                         if (!vp_ap)
  52                                 continue;
  53
  54                         vp_ap->nested_control.features.directhypercall = 1;
  55                 }
  56                 svm_x86_ops.enable_l2_tlb_flush =
  57                                 svm_hv_enable_l2_tlb_flush;
  58         }
  59 }
  60
  61 static inline void svm_hv_vmcb_dirty_nested_enlightenments(
  62                 struct kvm_vcpu *vcpu)
  63 {
  64         struct vmcb *vmcb = to_svm(vcpu)->vmcb;
  65         struct hv_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments;
  66
  67         if (hve->hv_enlightenments_control.msr_bitmap)
  68                 vmcb_mark_dirty(vmcb, HV_VMCB_NESTED_ENLIGHTENMENTS);
  69 }
  70
  71 static inline void svm_hv_update_vp_id(struct vmcb *vmcb, struct kvm_vcpu *vcpu)
  72 {
  73         struct hv_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments;
  74         u32 vp_index = kvm_hv_get_vpindex(vcpu);
  75
  76         if (hve->hv_vp_id != vp_index) {
  77                 hve->hv_vp_id = vp_index;
  78                 vmcb_mark_dirty(vmcb, HV_VMCB_NESTED_ENLIGHTENMENTS);
  79         }
  80 }
  81 #else
  82
  83 static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
  84 {
  85 }
  86
  87 static inline __init void svm_hv_hardware_setup(void)
  88 {
  89 }
  90
  91 static inline void svm_hv_vmcb_dirty_nested_enlightenments(
  92                 struct kvm_vcpu *vcpu)
  93 {
  94 }
  95
  96 static inline void svm_hv_update_vp_id(struct vmcb *vmcb,
  97                 struct kvm_vcpu *vcpu)
  98 {
  99 }
 100 #endif /* CONFIG_HYPERV */
 101
 102 #endif /* __ARCH_X86_KVM_SVM_ONHYPERV_H__ */