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130 lines
3.2 KiB
130 lines
3.2 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* KVM L1 hypervisor optimizations on Hyper-V for SVM. |
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*/ |
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#ifndef __ARCH_X86_KVM_SVM_ONHYPERV_H__ |
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#define __ARCH_X86_KVM_SVM_ONHYPERV_H__ |
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#if IS_ENABLED(CONFIG_HYPERV) |
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#include <asm/mshyperv.h> |
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#include "hyperv.h" |
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#include "kvm_onhyperv.h" |
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static struct kvm_x86_ops svm_x86_ops; |
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/* |
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* Hyper-V uses the software reserved 32 bytes in VMCB |
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* control area to expose SVM enlightenments to guests. |
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*/ |
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struct hv_enlightenments { |
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struct __packed hv_enlightenments_control { |
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u32 nested_flush_hypercall:1; |
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u32 msr_bitmap:1; |
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u32 enlightened_npt_tlb: 1; |
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u32 reserved:29; |
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} __packed hv_enlightenments_control; |
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u32 hv_vp_id; |
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u64 hv_vm_id; |
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u64 partition_assist_page; |
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u64 reserved; |
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} __packed; |
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/* |
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* Hyper-V uses the software reserved clean bit in VMCB |
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*/ |
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#define VMCB_HV_NESTED_ENLIGHTENMENTS VMCB_SW |
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int svm_hv_enable_direct_tlbflush(struct kvm_vcpu *vcpu); |
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static inline void svm_hv_init_vmcb(struct vmcb *vmcb) |
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{ |
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struct hv_enlightenments *hve = |
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(struct hv_enlightenments *)vmcb->control.reserved_sw; |
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if (npt_enabled && |
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ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB) |
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hve->hv_enlightenments_control.enlightened_npt_tlb = 1; |
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} |
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static inline void svm_hv_hardware_setup(void) |
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{ |
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if (npt_enabled && |
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ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB) { |
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pr_info("kvm: Hyper-V enlightened NPT TLB flush enabled\n"); |
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svm_x86_ops.tlb_remote_flush = hv_remote_flush_tlb; |
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svm_x86_ops.tlb_remote_flush_with_range = |
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hv_remote_flush_tlb_with_range; |
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} |
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if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) { |
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int cpu; |
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pr_info("kvm: Hyper-V Direct TLB Flush enabled\n"); |
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for_each_online_cpu(cpu) { |
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struct hv_vp_assist_page *vp_ap = |
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hv_get_vp_assist_page(cpu); |
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if (!vp_ap) |
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continue; |
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vp_ap->nested_control.features.directhypercall = 1; |
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} |
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svm_x86_ops.enable_direct_tlbflush = |
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svm_hv_enable_direct_tlbflush; |
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} |
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} |
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static inline void svm_hv_vmcb_dirty_nested_enlightenments( |
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struct kvm_vcpu *vcpu) |
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{ |
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struct vmcb *vmcb = to_svm(vcpu)->vmcb; |
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struct hv_enlightenments *hve = |
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(struct hv_enlightenments *)vmcb->control.reserved_sw; |
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/* |
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* vmcb can be NULL if called during early vcpu init. |
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* And its okay not to mark vmcb dirty during vcpu init |
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* as we mark it dirty unconditionally towards end of vcpu |
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* init phase. |
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*/ |
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if (vmcb_is_clean(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS) && |
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hve->hv_enlightenments_control.msr_bitmap) |
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vmcb_mark_dirty(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS); |
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} |
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static inline void svm_hv_update_vp_id(struct vmcb *vmcb, |
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struct kvm_vcpu *vcpu) |
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{ |
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struct hv_enlightenments *hve = |
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(struct hv_enlightenments *)vmcb->control.reserved_sw; |
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u32 vp_index = kvm_hv_get_vpindex(vcpu); |
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if (hve->hv_vp_id != vp_index) { |
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hve->hv_vp_id = vp_index; |
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vmcb_mark_dirty(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS); |
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} |
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} |
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#else |
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static inline void svm_hv_init_vmcb(struct vmcb *vmcb) |
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{ |
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} |
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static inline void svm_hv_hardware_setup(void) |
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{ |
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} |
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static inline void svm_hv_vmcb_dirty_nested_enlightenments( |
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struct kvm_vcpu *vcpu) |
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{ |
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} |
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static inline void svm_hv_update_vp_id(struct vmcb *vmcb, |
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struct kvm_vcpu *vcpu) |
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{ |
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} |
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#endif /* CONFIG_HYPERV */ |
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#endif /* __ARCH_X86_KVM_SVM_ONHYPERV_H__ */
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