tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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"
9enum vm_guest_mode vm_mode_default;
10#endif
11
12struct guest_mode guest_modes[NUM_VM_MODES];
13
14void 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
86void 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
100void 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
114void 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}