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 |