arch/loongarch/kvm/vm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
   4  */
   5
   6 #include <linux/kvm_host.h>
   7 #include <asm/kvm_mmu.h>
   8
   9 const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
  10         KVM_GENERIC_VM_STATS(),
  11         STATS_DESC_ICOUNTER(VM, pages),
  12         STATS_DESC_ICOUNTER(VM, hugepages),
  13 };
  14
  15 const struct kvm_stats_header kvm_vm_stats_header = {
  16         .name_size = KVM_STATS_NAME_SIZE,
  17         .num_desc = ARRAY_SIZE(kvm_vm_stats_desc),
  18         .id_offset =  sizeof(struct kvm_stats_header),
  19         .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
  20         .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
  21                                         sizeof(kvm_vm_stats_desc),
  22 };
  23
  24 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
  25 {
  26         int i;
  27
  28         /* Allocate page table to map GPA -> RPA */
  29         kvm->arch.pgd = kvm_pgd_alloc();
  30         if (!kvm->arch.pgd)
  31                 return -ENOMEM;
  32
  33         kvm_init_vmcs(kvm);
  34         kvm->arch.gpa_size = BIT(cpu_vabits - 1);
  35         kvm->arch.root_level = CONFIG_PGTABLE_LEVELS - 1;
  36         kvm->arch.invalid_ptes[0] = 0;
  37         kvm->arch.invalid_ptes[1] = (unsigned long)invalid_pte_table;
  38 #if CONFIG_PGTABLE_LEVELS > 2
  39         kvm->arch.invalid_ptes[2] = (unsigned long)invalid_pmd_table;
  40 #endif
  41 #if CONFIG_PGTABLE_LEVELS > 3
  42         kvm->arch.invalid_ptes[3] = (unsigned long)invalid_pud_table;
  43 #endif
  44         for (i = 0; i <= kvm->arch.root_level; i++)
  45                 kvm->arch.pte_shifts[i] = PAGE_SHIFT + i * (PAGE_SHIFT - 3);
  46
  47         return 0;
  48 }
  49
  50 void kvm_arch_destroy_vm(struct kvm *kvm)
  51 {
  52         kvm_destroy_vcpus(kvm);
  53         free_page((unsigned long)kvm->arch.pgd);
  54         kvm->arch.pgd = NULL;
  55 }
  56
  57 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
  58 {
  59         int r;
  60
  61         switch (ext) {
  62         case KVM_CAP_ONE_REG:
  63         case KVM_CAP_ENABLE_CAP:
  64         case KVM_CAP_READONLY_MEM:
  65         case KVM_CAP_SYNC_MMU:
  66         case KVM_CAP_IMMEDIATE_EXIT:
  67         case KVM_CAP_IOEVENTFD:
  68         case KVM_CAP_MP_STATE:
  69                 r = 1;
  70                 break;
  71         case KVM_CAP_NR_VCPUS:
  72                 r = num_online_cpus();
  73                 break;
  74         case KVM_CAP_MAX_VCPUS:
  75                 r = KVM_MAX_VCPUS;
  76                 break;
  77         case KVM_CAP_MAX_VCPU_ID:
  78                 r = KVM_MAX_VCPU_IDS;
  79                 break;
  80         case KVM_CAP_NR_MEMSLOTS:
  81                 r = KVM_USER_MEM_SLOTS;
  82                 break;
  83         default:
  84                 r = 0;
  85                 break;
  86         }
  87
  88         return r;
  89 }
  90
  91 int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
  92 {
  93         return -ENOIOCTLCMD;
  94 }