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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* KVM L1 hypervisor optimizations on Hyper-V.
*/
#ifndef __ARCH_X86_KVM_KVM_ONHYPERV_H__
#define __ARCH_X86_KVM_KVM_ONHYPERV_H__
#if IS_ENABLED(CONFIG_HYPERV)
int hv_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, gfn_t nr_pages);
int hv_flush_remote_tlbs(struct kvm *kvm);
void hv_track_root_tdp(struct kvm_vcpu *vcpu, hpa_t root_tdp);
static inline hpa_t hv_get_partition_assist_page(struct kvm_vcpu *vcpu)
{
/*
* Partition assist page is something which Hyper-V running in L0
* requires from KVM running in L1 before direct TLB flush for L2
* guests can be enabled. KVM doesn't currently use the page but to
* comply with TLFS it still needs to be allocated. For now, this
* is a single page shared among all vCPUs.
*/
struct hv_partition_assist_pg **p_hv_pa_pg =
&vcpu->kvm->arch.hv_pa_pg;
if (!*p_hv_pa_pg)
*p_hv_pa_pg = kzalloc(PAGE_SIZE, GFP_KERNEL_ACCOUNT);
if (!*p_hv_pa_pg)
return INVALID_PAGE;
return __pa(*p_hv_pa_pg);
}
#else /* !CONFIG_HYPERV */
static inline int hv_flush_remote_tlbs(struct kvm *kvm)
{
return -EOPNOTSUPP;
}
static inline void hv_track_root_tdp(struct kvm_vcpu *vcpu, hpa_t root_tdp)
{
}
#endif /* !CONFIG_HYPERV */
#endif
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