Claudio Fontana | f5cc5a5 | 2021-03-22 14:27:40 +0100 | [diff] [blame] | 1 | /* |
| 2 | * x86 host CPU functions, and "host" cpu type initialization |
| 3 | * |
| 4 | * Copyright 2021 SUSE LLC |
| 5 | * |
| 6 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 7 | * See the COPYING file in the top-level directory. |
| 8 | */ |
| 9 | |
| 10 | #include "qemu/osdep.h" |
| 11 | #include "cpu.h" |
| 12 | #include "host-cpu.h" |
| 13 | #include "qapi/error.h" |
Richard Henderson | cc37d98 | 2023-03-15 17:43:13 +0000 | [diff] [blame] | 14 | #include "qemu/error-report.h" |
Claudio Fontana | f5cc5a5 | 2021-03-22 14:27:40 +0100 | [diff] [blame] | 15 | #include "sysemu/sysemu.h" |
| 16 | |
| 17 | /* Note: Only safe for use on x86(-64) hosts */ |
| 18 | static uint32_t host_cpu_phys_bits(void) |
| 19 | { |
| 20 | uint32_t eax; |
| 21 | uint32_t host_phys_bits; |
| 22 | |
| 23 | host_cpuid(0x80000000, 0, &eax, NULL, NULL, NULL); |
| 24 | if (eax >= 0x80000008) { |
| 25 | host_cpuid(0x80000008, 0, &eax, NULL, NULL, NULL); |
| 26 | /* |
| 27 | * Note: According to AMD doc 25481 rev 2.34 they have a field |
| 28 | * at 23:16 that can specify a maximum physical address bits for |
| 29 | * the guest that can override this value; but I've not seen |
| 30 | * anything with that set. |
| 31 | */ |
| 32 | host_phys_bits = eax & 0xff; |
| 33 | } else { |
| 34 | /* |
| 35 | * It's an odd 64 bit machine that doesn't have the leaf for |
| 36 | * physical address bits; fall back to 36 that's most older |
| 37 | * Intel. |
| 38 | */ |
| 39 | host_phys_bits = 36; |
| 40 | } |
| 41 | |
| 42 | return host_phys_bits; |
| 43 | } |
| 44 | |
Claudio Fontana | ce21726 | 2021-03-22 14:27:43 +0100 | [diff] [blame] | 45 | static uint32_t host_cpu_adjust_phys_bits(X86CPU *cpu) |
Claudio Fontana | f5cc5a5 | 2021-03-22 14:27:40 +0100 | [diff] [blame] | 46 | { |
| 47 | uint32_t host_phys_bits = host_cpu_phys_bits(); |
| 48 | uint32_t phys_bits = cpu->phys_bits; |
Claudio Fontana | f5cc5a5 | 2021-03-22 14:27:40 +0100 | [diff] [blame] | 49 | |
| 50 | /* |
| 51 | * Print a warning if the user set it to a value that's not the |
| 52 | * host value. |
| 53 | */ |
Zhao Liu | 7502ffb | 2024-03-27 18:39:49 +0800 | [diff] [blame] | 54 | if (phys_bits != host_phys_bits && phys_bits != 0) { |
| 55 | warn_report_once("Host physical bits (%u)" |
| 56 | " does not match phys-bits property (%u)", |
| 57 | host_phys_bits, phys_bits); |
Claudio Fontana | f5cc5a5 | 2021-03-22 14:27:40 +0100 | [diff] [blame] | 58 | } |
| 59 | |
| 60 | if (cpu->host_phys_bits) { |
| 61 | /* The user asked for us to use the host physical bits */ |
| 62 | phys_bits = host_phys_bits; |
| 63 | if (cpu->host_phys_bits_limit && |
| 64 | phys_bits > cpu->host_phys_bits_limit) { |
| 65 | phys_bits = cpu->host_phys_bits_limit; |
| 66 | } |
| 67 | } |
| 68 | |
Claudio Fontana | f5cc5a5 | 2021-03-22 14:27:40 +0100 | [diff] [blame] | 69 | return phys_bits; |
| 70 | } |
| 71 | |
Claudio Fontana | 9ea057d | 2021-03-22 14:27:44 +0100 | [diff] [blame] | 72 | bool host_cpu_realizefn(CPUState *cs, Error **errp) |
Claudio Fontana | f5cc5a5 | 2021-03-22 14:27:40 +0100 | [diff] [blame] | 73 | { |
| 74 | X86CPU *cpu = X86_CPU(cs); |
| 75 | CPUX86State *env = &cpu->env; |
| 76 | |
Claudio Fontana | f5cc5a5 | 2021-03-22 14:27:40 +0100 | [diff] [blame] | 77 | if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_LM) { |
Claudio Fontana | ce21726 | 2021-03-22 14:27:43 +0100 | [diff] [blame] | 78 | uint32_t phys_bits = host_cpu_adjust_phys_bits(cpu); |
| 79 | |
| 80 | if (phys_bits && |
| 81 | (phys_bits > TARGET_PHYS_ADDR_SPACE_BITS || |
| 82 | phys_bits < 32)) { |
| 83 | error_setg(errp, "phys-bits should be between 32 and %u " |
| 84 | " (but is %u)", |
| 85 | TARGET_PHYS_ADDR_SPACE_BITS, phys_bits); |
Claudio Fontana | 9ea057d | 2021-03-22 14:27:44 +0100 | [diff] [blame] | 86 | return false; |
Claudio Fontana | ce21726 | 2021-03-22 14:27:43 +0100 | [diff] [blame] | 87 | } |
| 88 | cpu->phys_bits = phys_bits; |
Claudio Fontana | f5cc5a5 | 2021-03-22 14:27:40 +0100 | [diff] [blame] | 89 | } |
Claudio Fontana | 9ea057d | 2021-03-22 14:27:44 +0100 | [diff] [blame] | 90 | return true; |
Claudio Fontana | f5cc5a5 | 2021-03-22 14:27:40 +0100 | [diff] [blame] | 91 | } |
| 92 | |
| 93 | #define CPUID_MODEL_ID_SZ 48 |
| 94 | /** |
| 95 | * cpu_x86_fill_model_id: |
| 96 | * Get CPUID model ID string from host CPU. |
| 97 | * |
| 98 | * @str should have at least CPUID_MODEL_ID_SZ bytes |
| 99 | * |
| 100 | * The function does NOT add a null terminator to the string |
| 101 | * automatically. |
| 102 | */ |
| 103 | static int host_cpu_fill_model_id(char *str) |
| 104 | { |
| 105 | uint32_t eax = 0, ebx = 0, ecx = 0, edx = 0; |
| 106 | int i; |
| 107 | |
| 108 | for (i = 0; i < 3; i++) { |
| 109 | host_cpuid(0x80000002 + i, 0, &eax, &ebx, &ecx, &edx); |
| 110 | memcpy(str + i * 16 + 0, &eax, 4); |
| 111 | memcpy(str + i * 16 + 4, &ebx, 4); |
| 112 | memcpy(str + i * 16 + 8, &ecx, 4); |
| 113 | memcpy(str + i * 16 + 12, &edx, 4); |
| 114 | } |
| 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | void host_cpu_vendor_fms(char *vendor, int *family, int *model, int *stepping) |
| 119 | { |
| 120 | uint32_t eax, ebx, ecx, edx; |
| 121 | |
| 122 | host_cpuid(0x0, 0, &eax, &ebx, &ecx, &edx); |
| 123 | x86_cpu_vendor_words2str(vendor, ebx, edx, ecx); |
| 124 | |
| 125 | host_cpuid(0x1, 0, &eax, &ebx, &ecx, &edx); |
| 126 | if (family) { |
| 127 | *family = ((eax >> 8) & 0x0F) + ((eax >> 20) & 0xFF); |
| 128 | } |
| 129 | if (model) { |
| 130 | *model = ((eax >> 4) & 0x0F) | ((eax & 0xF0000) >> 12); |
| 131 | } |
| 132 | if (stepping) { |
| 133 | *stepping = eax & 0x0F; |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | void host_cpu_instance_init(X86CPU *cpu) |
| 138 | { |
Claudio Fontana | 5b8978d | 2021-07-23 13:29:21 +0200 | [diff] [blame] | 139 | X86CPUClass *xcc = X86_CPU_GET_CLASS(cpu); |
Claudio Fontana | f5cc5a5 | 2021-03-22 14:27:40 +0100 | [diff] [blame] | 140 | |
Claudio Fontana | 5b8978d | 2021-07-23 13:29:21 +0200 | [diff] [blame] | 141 | if (xcc->model) { |
| 142 | uint32_t ebx = 0, ecx = 0, edx = 0; |
| 143 | char vendor[CPUID_VENDOR_SZ + 1]; |
Claudio Fontana | f5cc5a5 | 2021-03-22 14:27:40 +0100 | [diff] [blame] | 144 | |
Claudio Fontana | 5b8978d | 2021-07-23 13:29:21 +0200 | [diff] [blame] | 145 | host_cpuid(0, 0, NULL, &ebx, &ecx, &edx); |
| 146 | x86_cpu_vendor_words2str(vendor, ebx, edx, ecx); |
| 147 | object_property_set_str(OBJECT(cpu), "vendor", vendor, &error_abort); |
| 148 | } |
Claudio Fontana | f5cc5a5 | 2021-03-22 14:27:40 +0100 | [diff] [blame] | 149 | } |
| 150 | |
| 151 | void host_cpu_max_instance_init(X86CPU *cpu) |
| 152 | { |
| 153 | char vendor[CPUID_VENDOR_SZ + 1] = { 0 }; |
| 154 | char model_id[CPUID_MODEL_ID_SZ + 1] = { 0 }; |
| 155 | int family, model, stepping; |
| 156 | |
| 157 | /* Use max host physical address bits if -cpu max option is applied */ |
| 158 | object_property_set_bool(OBJECT(cpu), "host-phys-bits", true, &error_abort); |
| 159 | |
| 160 | host_cpu_vendor_fms(vendor, &family, &model, &stepping); |
| 161 | host_cpu_fill_model_id(model_id); |
| 162 | |
| 163 | object_property_set_str(OBJECT(cpu), "vendor", vendor, &error_abort); |
| 164 | object_property_set_int(OBJECT(cpu), "family", family, &error_abort); |
| 165 | object_property_set_int(OBJECT(cpu), "model", model, &error_abort); |
| 166 | object_property_set_int(OBJECT(cpu), "stepping", stepping, |
| 167 | &error_abort); |
| 168 | object_property_set_str(OBJECT(cpu), "model-id", model_id, |
| 169 | &error_abort); |
| 170 | } |
| 171 | |
| 172 | static void host_cpu_class_init(ObjectClass *oc, void *data) |
| 173 | { |
| 174 | X86CPUClass *xcc = X86_CPU_CLASS(oc); |
| 175 | |
| 176 | xcc->host_cpuid_required = true; |
| 177 | xcc->ordering = 8; |
| 178 | xcc->model_description = |
| 179 | g_strdup_printf("processor with all supported host features "); |
| 180 | } |
| 181 | |
| 182 | static const TypeInfo host_cpu_type_info = { |
| 183 | .name = X86_CPU_TYPE_NAME("host"), |
| 184 | .parent = X86_CPU_TYPE_NAME("max"), |
| 185 | .class_init = host_cpu_class_init, |
| 186 | }; |
| 187 | |
| 188 | static void host_cpu_type_init(void) |
| 189 | { |
| 190 | type_register_static(&host_cpu_type_info); |
| 191 | } |
| 192 | |
| 193 | type_init(host_cpu_type_init); |