11e0c7d40SVineeth Pillai /* SPDX-License-Identifier: GPL-2.0-only */ 21e0c7d40SVineeth Pillai /* 31e0c7d40SVineeth Pillai * KVM L1 hypervisor optimizations on Hyper-V for SVM. 41e0c7d40SVineeth Pillai */ 51e0c7d40SVineeth Pillai 61e0c7d40SVineeth Pillai #ifndef __ARCH_X86_KVM_SVM_ONHYPERV_H__ 71e0c7d40SVineeth Pillai #define __ARCH_X86_KVM_SVM_ONHYPERV_H__ 81e0c7d40SVineeth Pillai 91e0c7d40SVineeth Pillai #if IS_ENABLED(CONFIG_HYPERV) 101e0c7d40SVineeth Pillai #include <asm/mshyperv.h> 111e0c7d40SVineeth Pillai 121e0c7d40SVineeth Pillai #include "hyperv.h" 131e0c7d40SVineeth Pillai #include "kvm_onhyperv.h" 141e0c7d40SVineeth Pillai 151e0c7d40SVineeth Pillai static struct kvm_x86_ops svm_x86_ops; 161e0c7d40SVineeth Pillai 171e0c7d40SVineeth Pillai /* 181e0c7d40SVineeth Pillai * Hyper-V uses the software reserved 32 bytes in VMCB 191e0c7d40SVineeth Pillai * control area to expose SVM enlightenments to guests. 201e0c7d40SVineeth Pillai */ 211e0c7d40SVineeth Pillai struct hv_enlightenments { 221e0c7d40SVineeth Pillai struct __packed hv_enlightenments_control { 231e0c7d40SVineeth Pillai u32 nested_flush_hypercall:1; 241e0c7d40SVineeth Pillai u32 msr_bitmap:1; 251e0c7d40SVineeth Pillai u32 enlightened_npt_tlb: 1; 261e0c7d40SVineeth Pillai u32 reserved:29; 271e0c7d40SVineeth Pillai } __packed hv_enlightenments_control; 281e0c7d40SVineeth Pillai u32 hv_vp_id; 291e0c7d40SVineeth Pillai u64 hv_vm_id; 301e0c7d40SVineeth Pillai u64 partition_assist_page; 311e0c7d40SVineeth Pillai u64 reserved; 321e0c7d40SVineeth Pillai } __packed; 331e0c7d40SVineeth Pillai 34*c4327f15SVineeth Pillai /* 35*c4327f15SVineeth Pillai * Hyper-V uses the software reserved clean bit in VMCB 36*c4327f15SVineeth Pillai */ 37*c4327f15SVineeth Pillai #define VMCB_HV_NESTED_ENLIGHTENMENTS VMCB_SW 38*c4327f15SVineeth Pillai 391e0c7d40SVineeth Pillai static inline void svm_hv_init_vmcb(struct vmcb *vmcb) 401e0c7d40SVineeth Pillai { 411e0c7d40SVineeth Pillai struct hv_enlightenments *hve = 421e0c7d40SVineeth Pillai (struct hv_enlightenments *)vmcb->control.reserved_sw; 431e0c7d40SVineeth Pillai 441e0c7d40SVineeth Pillai if (npt_enabled && 451e0c7d40SVineeth Pillai ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB) 461e0c7d40SVineeth Pillai hve->hv_enlightenments_control.enlightened_npt_tlb = 1; 471e0c7d40SVineeth Pillai } 481e0c7d40SVineeth Pillai 491e0c7d40SVineeth Pillai static inline void svm_hv_hardware_setup(void) 501e0c7d40SVineeth Pillai { 511e0c7d40SVineeth Pillai if (npt_enabled && 521e0c7d40SVineeth Pillai ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB) { 531e0c7d40SVineeth Pillai pr_info("kvm: Hyper-V enlightened NPT TLB flush enabled\n"); 541e0c7d40SVineeth Pillai svm_x86_ops.tlb_remote_flush = hv_remote_flush_tlb; 551e0c7d40SVineeth Pillai svm_x86_ops.tlb_remote_flush_with_range = 561e0c7d40SVineeth Pillai hv_remote_flush_tlb_with_range; 571e0c7d40SVineeth Pillai } 581e0c7d40SVineeth Pillai } 591e0c7d40SVineeth Pillai 60*c4327f15SVineeth Pillai static inline void svm_hv_vmcb_dirty_nested_enlightenments( 61*c4327f15SVineeth Pillai struct kvm_vcpu *vcpu) 62*c4327f15SVineeth Pillai { 63*c4327f15SVineeth Pillai struct vmcb *vmcb = to_svm(vcpu)->vmcb; 64*c4327f15SVineeth Pillai struct hv_enlightenments *hve = 65*c4327f15SVineeth Pillai (struct hv_enlightenments *)vmcb->control.reserved_sw; 66*c4327f15SVineeth Pillai 67*c4327f15SVineeth Pillai /* 68*c4327f15SVineeth Pillai * vmcb can be NULL if called during early vcpu init. 69*c4327f15SVineeth Pillai * And its okay not to mark vmcb dirty during vcpu init 70*c4327f15SVineeth Pillai * as we mark it dirty unconditionally towards end of vcpu 71*c4327f15SVineeth Pillai * init phase. 72*c4327f15SVineeth Pillai */ 73*c4327f15SVineeth Pillai if (vmcb && vmcb_is_clean(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS) && 74*c4327f15SVineeth Pillai hve->hv_enlightenments_control.msr_bitmap) 75*c4327f15SVineeth Pillai vmcb_mark_dirty(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS); 76*c4327f15SVineeth Pillai } 771e0c7d40SVineeth Pillai #else 781e0c7d40SVineeth Pillai 791e0c7d40SVineeth Pillai static inline void svm_hv_init_vmcb(struct vmcb *vmcb) 801e0c7d40SVineeth Pillai { 811e0c7d40SVineeth Pillai } 821e0c7d40SVineeth Pillai 831e0c7d40SVineeth Pillai static inline void svm_hv_hardware_setup(void) 841e0c7d40SVineeth Pillai { 851e0c7d40SVineeth Pillai } 86*c4327f15SVineeth Pillai 87*c4327f15SVineeth Pillai static inline void svm_hv_vmcb_dirty_nested_enlightenments( 88*c4327f15SVineeth Pillai struct kvm_vcpu *vcpu) 89*c4327f15SVineeth Pillai { 90*c4327f15SVineeth Pillai } 911e0c7d40SVineeth Pillai #endif /* CONFIG_HYPERV */ 921e0c7d40SVineeth Pillai 931e0c7d40SVineeth Pillai #endif /* __ARCH_X86_KVM_SVM_ONHYPERV_H__ */ 94