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
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