| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
|---|---|
| 2 | /* |
| 3 | * KVM L1 hypervisor optimizations on Hyper-V. |
| 4 | */ |
| 5 | |
| 6 | #ifndef __ARCH_X86_KVM_KVM_ONHYPERV_H__ |
| 7 | #define __ARCH_X86_KVM_KVM_ONHYPERV_H__ |
| 8 | |
| 9 | #if IS_ENABLED(CONFIG_HYPERV) |
| 10 | int hv_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, gfn_t nr_pages); |
| 11 | int hv_flush_remote_tlbs(struct kvm *kvm); |
| 12 | void hv_track_root_tdp(struct kvm_vcpu *vcpu, hpa_t root_tdp); |
| 13 | static inline hpa_t hv_get_partition_assist_page(struct kvm_vcpu *vcpu) |
| 14 | { |
| 15 | /* |
| 16 | * Partition assist page is something which Hyper-V running in L0 |
| 17 | * requires from KVM running in L1 before direct TLB flush for L2 |
| 18 | * guests can be enabled. KVM doesn't currently use the page but to |
| 19 | * comply with TLFS it still needs to be allocated. For now, this |
| 20 | * is a single page shared among all vCPUs. |
| 21 | */ |
| 22 | struct hv_partition_assist_pg **p_hv_pa_pg = |
| 23 | &vcpu->kvm->arch.hv_pa_pg; |
| 24 | |
| 25 | if (!*p_hv_pa_pg) |
| 26 | *p_hv_pa_pg = kzalloc(PAGE_SIZE, GFP_KERNEL_ACCOUNT); |
| 27 | |
| 28 | if (!*p_hv_pa_pg) |
| 29 | return INVALID_PAGE; |
| 30 | |
| 31 | return __pa(*p_hv_pa_pg); |
| 32 | } |
| 33 | #else /* !CONFIG_HYPERV */ |
| 34 | static inline int hv_flush_remote_tlbs(struct kvm *kvm) |
| 35 | { |
| 36 | return -EOPNOTSUPP; |
| 37 | } |
| 38 | |
| 39 | static inline void hv_track_root_tdp(struct kvm_vcpu *vcpu, hpa_t root_tdp) |
| 40 | { |
| 41 | } |
| 42 | #endif /* !CONFIG_HYPERV */ |
| 43 | |
| 44 | #endif |
| 45 |