arch/riscv/kvm/vm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2019 Western Digital Corporation or its affiliates.
   4  *
   5  * Authors:
   6  *     Anup Patel <anup.patel@wdc.com>
   7  */
   8
   9 #include <linux/errno.h>
  10 #include <linux/err.h>
  11 #include <linux/module.h>
  12 #include <linux/uaccess.h>
  13 #include <linux/kvm_host.h>
  14
  15 const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
  16         KVM_GENERIC_VM_STATS()
  17 };
  18 static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==
  19                 sizeof(struct kvm_vm_stat) / sizeof(u64));
  20
  21 const struct kvm_stats_header kvm_vm_stats_header = {
  22         .name_size = KVM_STATS_NAME_SIZE,
  23         .num_desc = ARRAY_SIZE(kvm_vm_stats_desc),
  24         .id_offset =  sizeof(struct kvm_stats_header),
  25         .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
  26         .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
  27                        sizeof(kvm_vm_stats_desc),
  28 };
  29
  30 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
  31 {
  32         int r;
  33
  34         r = kvm_riscv_gstage_alloc_pgd(kvm);
  35         if (r)
  36                 return r;
  37
  38         r = kvm_riscv_gstage_vmid_init(kvm);
  39         if (r) {
  40                 kvm_riscv_gstage_free_pgd(kvm);
  41                 return r;
  42         }
  43
  44         kvm_riscv_guest_timer_init(kvm);
  45
  46         return 0;
  47 }
  48
  49 void kvm_arch_destroy_vm(struct kvm *kvm)
  50 {
  51         kvm_destroy_vcpus(kvm);
  52 }
  53
  54 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
  55 {
  56         int r;
  57
  58         switch (ext) {
  59         case KVM_CAP_IOEVENTFD:
  60         case KVM_CAP_DEVICE_CTRL:
  61         case KVM_CAP_USER_MEMORY:
  62         case KVM_CAP_SYNC_MMU:
  63         case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
  64         case KVM_CAP_ONE_REG:
  65         case KVM_CAP_READONLY_MEM:
  66         case KVM_CAP_MP_STATE:
  67         case KVM_CAP_IMMEDIATE_EXIT:
  68                 r = 1;
  69                 break;
  70         case KVM_CAP_NR_VCPUS:
  71                 r = min_t(unsigned int, num_online_cpus(), KVM_MAX_VCPUS);
  72                 break;
  73         case KVM_CAP_MAX_VCPUS:
  74                 r = KVM_MAX_VCPUS;
  75                 break;
  76         case KVM_CAP_NR_MEMSLOTS:
  77                 r = KVM_USER_MEM_SLOTS;
  78                 break;
  79         case KVM_CAP_VM_GPA_BITS:
  80                 r = kvm_riscv_gstage_gpa_bits();
  81                 break;
  82         default:
  83                 r = 0;
  84                 break;
  85         }
  86
  87         return r;
  88 }
  89
  90 long kvm_arch_vm_ioctl(struct file *filp,
  91                        unsigned int ioctl, unsigned long arg)
  92 {
  93         return -EINVAL;
  94 }