45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
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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.
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*/
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#ifndef __ARCH_X86_KVM_KVM_ONHYPERV_H__
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#define __ARCH_X86_KVM_KVM_ONHYPERV_H__
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#if IS_ENABLED(CONFIG_HYPERV)
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int hv_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, gfn_t nr_pages);
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int hv_flush_remote_tlbs(struct kvm *kvm);
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void hv_track_root_tdp(struct kvm_vcpu *vcpu, hpa_t root_tdp);
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static inline hpa_t hv_get_partition_assist_page(struct kvm_vcpu *vcpu)
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{
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/*
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* Partition assist page is something which Hyper-V running in L0
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* requires from KVM running in L1 before direct TLB flush for L2
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* guests can be enabled. KVM doesn't currently use the page but to
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* comply with TLFS it still needs to be allocated. For now, this
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* is a single page shared among all vCPUs.
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*/
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struct hv_partition_assist_pg **p_hv_pa_pg =
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&vcpu->kvm->arch.hv_pa_pg;
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if (!*p_hv_pa_pg)
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*p_hv_pa_pg = kzalloc(PAGE_SIZE, GFP_KERNEL_ACCOUNT);
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if (!*p_hv_pa_pg)
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return INVALID_PAGE;
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return __pa(*p_hv_pa_pg);
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}
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#else /* !CONFIG_HYPERV */
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static inline int hv_flush_remote_tlbs(struct kvm *kvm)
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{
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return -EOPNOTSUPP;
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}
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static inline void hv_track_root_tdp(struct kvm_vcpu *vcpu, hpa_t root_tdp)
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{
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}
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#endif /* !CONFIG_HYPERV */
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#endif
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