kvm_onhyperv.h

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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