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