LXR linux/arch/x86/kvm/svm/svm

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * KVM L1 hypervisor optimizations on Hyper-V for SVM.
   4 */
   5
   6#include <linux/kvm_host.h>
   7#include "kvm_cache_regs.h"
   8
   9#include <asm/mshyperv.h>
  10
  11#include "svm.h"
  12#include "svm_ops.h"
  13
  14#include "hyperv.h"
  15#include "kvm_onhyperv.h"
  16#include "svm_onhyperv.h"
  17
  18int svm_hv_enable_direct_tlbflush(struct kvm_vcpu *vcpu)
  19{
  20        struct hv_enlightenments *hve;
  21        struct hv_partition_assist_pg **p_hv_pa_pg =
  22                        &to_kvm_hv(vcpu->kvm)->hv_pa_pg;
  23
  24        if (!*p_hv_pa_pg)
  25                *p_hv_pa_pg = kzalloc(PAGE_SIZE, GFP_KERNEL);
  26
  27        if (!*p_hv_pa_pg)
  28                return -ENOMEM;
  29
  30        hve = (struct hv_enlightenments *)to_svm(vcpu)->vmcb->control.reserved_sw;
  31
  32        hve->partition_assist_page = __pa(*p_hv_pa_pg);
  33        hve->hv_vm_id = (unsigned long)vcpu->kvm;
  34        if (!hve->hv_enlightenments_control.nested_flush_hypercall) {
  35                hve->hv_enlightenments_control.nested_flush_hypercall = 1;
  36                vmcb_mark_dirty(to_svm(vcpu)->vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS);
  37        }
  38
  39        return 0;
  40}
  41
  42