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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/x86/kvm/svm/svm_onhyperv.h
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/* 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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#include <asm/mshyperv.h>

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#if IS_ENABLED(CONFIG_HYPERV)

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#include "kvm_onhyperv.h"

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#include "svm/hyperv.h"

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static struct kvm_x86_ops svm_x86_ops;

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int svm_hv_enable_l2_tlb_flush(struct kvm_vcpu *vcpu);

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static inline bool svm_hv_is_enlightened_tlb_enabled(struct kvm_vcpu *vcpu)

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{

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	struct hv_vmcb_enlightenments *hve = &to_svm(vcpu)->vmcb->control.hv_enlightenments;

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	return ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB &&

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	       !!hve->hv_enlightenments_control.enlightened_npt_tlb;

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}

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static inline void svm_hv_init_vmcb(struct vmcb *vmcb)

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{

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	struct hv_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments;

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	BUILD_BUG_ON(sizeof(vmcb->control.hv_enlightenments) !=

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		     sizeof(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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	if (ms_hyperv.nested_features & HV_X64_NESTED_MSR_BITMAP)

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		hve->hv_enlightenments_control.msr_bitmap = 1;

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}

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static inline __init 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(KBUILD_MODNAME ": Hyper-V enlightened NPT TLB flush enabled\n");

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		svm_x86_ops.flush_remote_tlbs = hv_flush_remote_tlbs;

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		svm_x86_ops.flush_remote_tlbs_range = hv_flush_remote_tlbs_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(KBUILD_MODNAME ": 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_l2_tlb_flush =

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				svm_hv_enable_l2_tlb_flush;

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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_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments;

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	if (hve->hv_enlightenments_control.msr_bitmap)

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		vmcb_mark_dirty(vmcb, HV_VMCB_NESTED_ENLIGHTENMENTS);

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}

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static inline void svm_hv_update_vp_id(struct vmcb *vmcb, struct kvm_vcpu *vcpu)

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{

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	struct hv_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments;

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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, HV_VMCB_NESTED_ENLIGHTENMENTS);

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	}

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}

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#else

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static inline bool svm_hv_is_enlightened_tlb_enabled(struct kvm_vcpu *vcpu)

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{

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	return false;

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}

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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 __init 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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