arch/x86/kvm/svm/svm_onhyperv.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * KVM L1 hypervisor optimizations on Hyper-V for SVM.
   4  */
   5 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   6
   7 #include <linux/kvm_host.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
  18 int svm_hv_enable_l2_tlb_flush(struct kvm_vcpu *vcpu)
  19 {
  20         struct hv_vmcb_enlightenments *hve;
  21         hpa_t partition_assist_page = hv_get_partition_assist_page(vcpu);
  22
  23         if (partition_assist_page == INVALID_PAGE)
  24                 return -ENOMEM;
  25
  26         hve = &to_svm(vcpu)->vmcb->control.hv_enlightenments;
  27
  28         hve->partition_assist_page = partition_assist_page;
  29         hve->hv_vm_id = (unsigned long)vcpu->kvm;
  30         if (!hve->hv_enlightenments_control.nested_flush_hypercall) {
  31                 hve->hv_enlightenments_control.nested_flush_hypercall = 1;
  32                 vmcb_mark_dirty(to_svm(vcpu)->vmcb, HV_VMCB_NESTED_ENLIGHTENMENTS);
  33         }
  34
  35         return 0;
  36 }
  37