tools/testing/selftests/kvm/lib/guest_modes.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2020, Red Hat, Inc.
   4  */
   5 #include "guest_modes.h"
   6
   7 #ifdef __aarch64__
   8 #include "processor.h"
   9 enum vm_guest_mode vm_mode_default;
  10 #endif
  11
  12 struct guest_mode guest_modes[NUM_VM_MODES];
  13
  14 void guest_modes_append_default(void)
  15 {
  16 #ifndef __aarch64__
  17         guest_mode_append(VM_MODE_DEFAULT, true);
  18 #else
  19         {
  20                 unsigned int limit = kvm_check_cap(KVM_CAP_ARM_VM_IPA_SIZE);
  21                 uint32_t ipa4k, ipa16k, ipa64k;
  22                 int i;
  23
  24                 aarch64_get_supported_page_sizes(limit, &ipa4k, &ipa16k, &ipa64k);
  25
  26                 guest_mode_append(VM_MODE_P52V48_4K, ipa4k >= 52);
  27                 guest_mode_append(VM_MODE_P52V48_16K, ipa16k >= 52);
  28                 guest_mode_append(VM_MODE_P52V48_64K, ipa64k >= 52);
  29
  30                 guest_mode_append(VM_MODE_P48V48_4K, ipa4k >= 48);
  31                 guest_mode_append(VM_MODE_P48V48_16K, ipa16k >= 48);
  32                 guest_mode_append(VM_MODE_P48V48_64K, ipa64k >= 48);
  33
  34                 guest_mode_append(VM_MODE_P40V48_4K, ipa4k >= 40);
  35                 guest_mode_append(VM_MODE_P40V48_16K, ipa16k >= 40);
  36                 guest_mode_append(VM_MODE_P40V48_64K, ipa64k >= 40);
  37
  38                 guest_mode_append(VM_MODE_P36V48_4K, ipa4k >= 36);
  39                 guest_mode_append(VM_MODE_P36V48_16K, ipa16k >= 36);
  40                 guest_mode_append(VM_MODE_P36V48_64K, ipa64k >= 36);
  41                 guest_mode_append(VM_MODE_P36V47_16K, ipa16k >= 36);
  42
  43                 vm_mode_default = ipa4k >= 40 ? VM_MODE_P40V48_4K : NUM_VM_MODES;
  44
  45                 /*
  46                  * Pick the first supported IPA size if the default
  47                  * isn't available.
  48                  */
  49                 for (i = 0; vm_mode_default == NUM_VM_MODES && i < NUM_VM_MODES; i++) {
  50                         if (guest_modes[i].supported && guest_modes[i].enabled)
  51                                 vm_mode_default = i;
  52                 }
  53
  54                 TEST_ASSERT(vm_mode_default != NUM_VM_MODES,
  55                             "No supported mode!");
  56         }
  57 #endif
  58 #ifdef __s390x__
  59         {
  60                 int kvm_fd, vm_fd;
  61                 struct kvm_s390_vm_cpu_processor info;
  62
  63                 kvm_fd = open_kvm_dev_path_or_exit();
  64                 vm_fd = __kvm_ioctl(kvm_fd, KVM_CREATE_VM, NULL);
  65                 kvm_device_attr_get(vm_fd, KVM_S390_VM_CPU_MODEL,
  66                                     KVM_S390_VM_CPU_PROCESSOR, &info);
  67                 close(vm_fd);
  68                 close(kvm_fd);
  69                 /* Starting with z13 we have 47bits of physical address */
  70                 if (info.ibc >= 0x30)
  71                         guest_mode_append(VM_MODE_P47V64_4K, true);
  72         }
  73 #endif
  74 #ifdef __riscv
  75         {
  76                 unsigned int sz = kvm_check_cap(KVM_CAP_VM_GPA_BITS);
  77
  78                 if (sz >= 52)
  79                         guest_mode_append(VM_MODE_P52V48_4K, true);
  80                 if (sz >= 48)
  81                         guest_mode_append(VM_MODE_P48V48_4K, true);
  82         }
  83 #endif
  84 }
  85
  86 void for_each_guest_mode(void (*func)(enum vm_guest_mode, void *), void *arg)
  87 {
  88         int i;
  89
  90         for (i = 0; i < NUM_VM_MODES; ++i) {
  91                 if (!guest_modes[i].enabled)
  92                         continue;
  93                 TEST_ASSERT(guest_modes[i].supported,
  94                             "Guest mode ID %d (%s) not supported.",
  95                             i, vm_guest_mode_string(i));
  96                 func(i, arg);
  97         }
  98 }
  99
 100 void guest_modes_help(void)
 101 {
 102         int i;
 103
 104         printf(" -m: specify the guest mode ID to test\n"
 105                "     (default: test all supported modes)\n"
 106                "     This option may be used multiple times.\n"
 107                "     Guest mode IDs:\n");
 108         for (i = 0; i < NUM_VM_MODES; ++i) {
 109                 printf("         %d:    %s%s\n", i, vm_guest_mode_string(i),
 110                        guest_modes[i].supported ? " (supported)" : "");
 111         }
 112 }
 113
 114 void guest_modes_cmdline(const char *arg)
 115 {
 116         static bool mode_selected;
 117         unsigned int mode;
 118         int i;
 119
 120         if (!mode_selected) {
 121                 for (i = 0; i < NUM_VM_MODES; ++i)
 122                         guest_modes[i].enabled = false;
 123                 mode_selected = true;
 124         }
 125
 126         mode = atoi_non_negative("Guest mode ID", arg);
 127         TEST_ASSERT(mode < NUM_VM_MODES, "Guest mode ID %d too big", mode);
 128         guest_modes[mode].enabled = true;
 129 }