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_aia_init_vm(kvm);
  45
  46         kvm_riscv_guest_timer_init(kvm);
  47
  48         return 0;
  49 }
  50
  51 void kvm_arch_destroy_vm(struct kvm *kvm)
  52 {
  53         kvm_destroy_vcpus(kvm);
  54
  55         kvm_riscv_aia_destroy_vm(kvm);
  56 }
  57
  58 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irql,
  59                           bool line_status)
  60 {
  61         if (!irqchip_in_kernel(kvm))
  62                 return -ENXIO;
  63
  64         return kvm_riscv_aia_inject_irq(kvm, irql->irq, irql->level);
  65 }
  66
  67 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
  68                 struct kvm *kvm, int irq_source_id,
  69                 int level, bool line_status)
  70 {
  71         struct kvm_msi msi;
  72
  73         if (!level)
  74                 return -1;
  75
  76         msi.address_lo = e->msi.address_lo;
  77         msi.address_hi = e->msi.address_hi;
  78         msi.data = e->msi.data;
  79         msi.flags = e->msi.flags;
  80         msi.devid = e->msi.devid;
  81
  82         return kvm_riscv_aia_inject_msi(kvm, &msi);
  83 }
  84
  85 static int kvm_riscv_set_irq(struct kvm_kernel_irq_routing_entry *e,
  86                              struct kvm *kvm, int irq_source_id,
  87                              int level, bool line_status)
  88 {
  89         return kvm_riscv_aia_inject_irq(kvm, e->irqchip.pin, level);
  90 }
  91
  92 int kvm_riscv_setup_default_irq_routing(struct kvm *kvm, u32 lines)
  93 {
  94         struct kvm_irq_routing_entry *ents;
  95         int i, rc;
  96
  97         ents = kcalloc(lines, sizeof(*ents), GFP_KERNEL);
  98         if (!ents)
  99                 return -ENOMEM;
 100
 101         for (i = 0; i < lines; i++) {
 102                 ents[i].gsi = i;
 103                 ents[i].type = KVM_IRQ_ROUTING_IRQCHIP;
 104                 ents[i].u.irqchip.irqchip = 0;
 105                 ents[i].u.irqchip.pin = i;
 106         }
 107         rc = kvm_set_irq_routing(kvm, ents, lines, 0);
 108         kfree(ents);
 109
 110         return rc;
 111 }
 112
 113 bool kvm_arch_can_set_irq_routing(struct kvm *kvm)
 114 {
 115         return irqchip_in_kernel(kvm);
 116 }
 117
 118 int kvm_set_routing_entry(struct kvm *kvm,
 119                           struct kvm_kernel_irq_routing_entry *e,
 120                           const struct kvm_irq_routing_entry *ue)
 121 {
 122         int r = -EINVAL;
 123
 124         switch (ue->type) {
 125         case KVM_IRQ_ROUTING_IRQCHIP:
 126                 e->set = kvm_riscv_set_irq;
 127                 e->irqchip.irqchip = ue->u.irqchip.irqchip;
 128                 e->irqchip.pin = ue->u.irqchip.pin;
 129                 if ((e->irqchip.pin >= KVM_IRQCHIP_NUM_PINS) ||
 130                     (e->irqchip.irqchip >= KVM_NR_IRQCHIPS))
 131                         goto out;
 132                 break;
 133         case KVM_IRQ_ROUTING_MSI:
 134                 e->set = kvm_set_msi;
 135                 e->msi.address_lo = ue->u.msi.address_lo;
 136                 e->msi.address_hi = ue->u.msi.address_hi;
 137                 e->msi.data = ue->u.msi.data;
 138                 e->msi.flags = ue->flags;
 139                 e->msi.devid = ue->u.msi.devid;
 140                 break;
 141         default:
 142                 goto out;
 143         }
 144         r = 0;
 145 out:
 146         return r;
 147 }
 148
 149 int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
 150                               struct kvm *kvm, int irq_source_id, int level,
 151                               bool line_status)
 152 {
 153         if (!level)
 154                 return -EWOULDBLOCK;
 155
 156         switch (e->type) {
 157         case KVM_IRQ_ROUTING_MSI:
 158                 return kvm_set_msi(e, kvm, irq_source_id, level, line_status);
 159
 160         case KVM_IRQ_ROUTING_IRQCHIP:
 161                 return kvm_riscv_set_irq(e, kvm, irq_source_id,
 162                                          level, line_status);
 163         }
 164
 165         return -EWOULDBLOCK;
 166 }
 167
 168 bool kvm_arch_irqchip_in_kernel(struct kvm *kvm)
 169 {
 170         return irqchip_in_kernel(kvm);
 171 }
 172
 173 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 174 {
 175         int r;
 176
 177         switch (ext) {
 178         case KVM_CAP_IRQCHIP:
 179                 r = kvm_riscv_aia_available();
 180                 break;
 181         case KVM_CAP_IOEVENTFD:
 182         case KVM_CAP_USER_MEMORY:
 183         case KVM_CAP_SYNC_MMU:
 184         case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
 185         case KVM_CAP_ONE_REG:
 186         case KVM_CAP_READONLY_MEM:
 187         case KVM_CAP_MP_STATE:
 188         case KVM_CAP_IMMEDIATE_EXIT:
 189         case KVM_CAP_SET_GUEST_DEBUG:
 190                 r = 1;
 191                 break;
 192         case KVM_CAP_NR_VCPUS:
 193                 r = min_t(unsigned int, num_online_cpus(), KVM_MAX_VCPUS);
 194                 break;
 195         case KVM_CAP_MAX_VCPUS:
 196                 r = KVM_MAX_VCPUS;
 197                 break;
 198         case KVM_CAP_NR_MEMSLOTS:
 199                 r = KVM_USER_MEM_SLOTS;
 200                 break;
 201         case KVM_CAP_VM_GPA_BITS:
 202                 r = kvm_riscv_gstage_gpa_bits();
 203                 break;
 204         default:
 205                 r = 0;
 206                 break;
 207         }
 208
 209         return r;
 210 }
 211
 212 int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 213 {
 214         return -EINVAL;
 215 }