| 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.flush_remote_tlbs = hv_flush_remote_tlbs; |
| 49 | svm_x86_ops.flush_remote_tlbs_range = hv_flush_remote_tlbs_range; |
| 50 | } |
| 51 | |
| 52 | if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) { |
| 53 | int cpu; |
| 54 | |
| 55 | pr_info(KBUILD_MODNAME ": Hyper-V Direct TLB Flush enabled\n"); |
| 56 | for_each_online_cpu(cpu) { |
| 57 | struct hv_vp_assist_page *vp_ap = |
| 58 | hv_get_vp_assist_page(cpu); |
| 59 | |
| 60 | if (!vp_ap) |
| 61 | continue; |
| 62 | |
| 63 | vp_ap->nested_control.features.directhypercall = 1; |
| 64 | } |
| 65 | svm_x86_ops.enable_l2_tlb_flush = |
| 66 | svm_hv_enable_l2_tlb_flush; |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | static inline void svm_hv_vmcb_dirty_nested_enlightenments( |
| 71 | struct kvm_vcpu *vcpu) |
| 72 | { |
| 73 | struct vmcb *vmcb = to_svm(vcpu)->vmcb; |
| 74 | struct hv_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments; |
| 75 | |
| 76 | if (hve->hv_enlightenments_control.msr_bitmap) |
| 77 | vmcb_mark_dirty(vmcb, HV_VMCB_NESTED_ENLIGHTENMENTS); |
| 78 | } |
| 79 | |
| 80 | static inline void svm_hv_update_vp_id(struct vmcb *vmcb, struct kvm_vcpu *vcpu) |
| 81 | { |
| 82 | struct hv_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments; |
| 83 | u32 vp_index = kvm_hv_get_vpindex(vcpu); |
| 84 | |
| 85 | if (hve->hv_vp_id != vp_index) { |
| 86 | hve->hv_vp_id = vp_index; |
| 87 | vmcb_mark_dirty(vmcb, HV_VMCB_NESTED_ENLIGHTENMENTS); |
| 88 | } |
| 89 | } |
| 90 | #else |
| 91 | |
| 92 | static inline bool svm_hv_is_enlightened_tlb_enabled(struct kvm_vcpu *vcpu) |
| 93 | { |
| 94 | return false; |
| 95 | } |
| 96 | |
| 97 | static inline void svm_hv_init_vmcb(struct vmcb *vmcb) |
| 98 | { |
| 99 | } |
| 100 | |
| 101 | static inline __init void svm_hv_hardware_setup(void) |
| 102 | { |
| 103 | } |
| 104 | |
| 105 | static inline void svm_hv_vmcb_dirty_nested_enlightenments( |
| 106 | struct kvm_vcpu *vcpu) |
| 107 | { |
| 108 | } |
| 109 | |
| 110 | static inline void svm_hv_update_vp_id(struct vmcb *vmcb, |
| 111 | struct kvm_vcpu *vcpu) |
| 112 | { |
| 113 | } |
| 114 | #endif /* CONFIG_HYPERV */ |
| 115 | |
| 116 | #endif /* __ARCH_X86_KVM_SVM_ONHYPERV_H__ */ |
| 117 |