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 #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
  18 int 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