svm_onhyperv.h

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/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * KVM L1 hypervisor optimizations on Hyper-V for SVM.
 */
 
#ifndef __ARCH_X86_KVM_SVM_ONHYPERV_H__
#define __ARCH_X86_KVM_SVM_ONHYPERV_H__
 
#include <asm/mshyperv.h>
 
#if IS_ENABLED(CONFIG_HYPERV)
 
#include "kvm_onhyperv.h"
#include "svm/hyperv.h"
 
static struct kvm_x86_ops svm_x86_ops;
 
int svm_hv_enable_l2_tlb_flush(struct kvm_vcpu *vcpu);
 
static inline bool svm_hv_is_enlightened_tlb_enabled(struct kvm_vcpu *vcpu)
{
    struct hv_vmcb_enlightenments *hve = &to_svm(vcpu)->vmcb->control.hv_enlightenments;
 
    return ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB &&
           !!hve->hv_enlightenments_control.enlightened_npt_tlb;
}
 
static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
{
    struct hv_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments;
 
    BUILD_BUG_ON(sizeof(vmcb->control.hv_enlightenments) !=
             sizeof(vmcb->control.reserved_sw));
 
    if (npt_enabled &&
        ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB)
        hve->hv_enlightenments_control.enlightened_npt_tlb = 1;
 
    if (ms_hyperv.nested_features & HV_X64_NESTED_MSR_BITMAP)
        hve->hv_enlightenments_control.msr_bitmap = 1;
}
 
static inline __init void svm_hv_hardware_setup(void)
{
    if (npt_enabled &&
        ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB) {
        pr_info(KBUILD_MODNAME ": Hyper-V enlightened NPT TLB flush enabled\n");
        svm_x86_ops.flush_remote_tlbs = hv_flush_remote_tlbs;
        svm_x86_ops.flush_remote_tlbs_range = hv_flush_remote_tlbs_range;
    }
 
    if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) {
        int cpu;
 
        pr_info(KBUILD_MODNAME ": Hyper-V Direct TLB Flush enabled\n");
        for_each_online_cpu(cpu) {
            struct hv_vp_assist_page *vp_ap =
                hv_get_vp_assist_page(cpu);
 
            if (!vp_ap)
                continue;
 
            vp_ap->nested_control.features.directhypercall = 1;
        }
        svm_x86_ops.enable_l2_tlb_flush =
                svm_hv_enable_l2_tlb_flush;
    }
}
 
static inline void svm_hv_vmcb_dirty_nested_enlightenments(
        struct kvm_vcpu *vcpu)
{
    struct vmcb *vmcb = to_svm(vcpu)->vmcb;
    struct hv_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments;
 
    if (hve->hv_enlightenments_control.msr_bitmap)
        vmcb_mark_dirty(vmcb, HV_VMCB_NESTED_ENLIGHTENMENTS);
}
 
static inline void svm_hv_update_vp_id(struct vmcb *vmcb, struct kvm_vcpu *vcpu)
{
    struct hv_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments;
    u32 vp_index = kvm_hv_get_vpindex(vcpu);
 
    if (hve->hv_vp_id != vp_index) {
        hve->hv_vp_id = vp_index;
        vmcb_mark_dirty(vmcb, HV_VMCB_NESTED_ENLIGHTENMENTS);
    }
}
#else
 
static inline bool svm_hv_is_enlightened_tlb_enabled(struct kvm_vcpu *vcpu)
{
    return false;
}
 
static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
{
}
 
static inline __init void svm_hv_hardware_setup(void)
{
}
 
static inline void svm_hv_vmcb_dirty_nested_enlightenments(
        struct kvm_vcpu *vcpu)
{
}
 
static inline void svm_hv_update_vp_id(struct vmcb *vmcb,
        struct kvm_vcpu *vcpu)
{
}
#endif /* CONFIG_HYPERV */
 
#endif /* __ARCH_X86_KVM_SVM_ONHYPERV_H__ */