LXR qemu/target/s390x/cpu

   1/*
   2 * CPU models for s390x
   3 *
   4 * Copyright 2016 IBM Corp.
   5 *
   6 * Author(s): David Hildenbrand <dahi@linux.vnet.ibm.com>
   7 *
   8 * This work is licensed under the terms of the GNU GPL, version 2 or (at
   9 * your option) any later version. See the COPYING file in the top-level
  10 * directory.
  11 */
  12
  13#ifndef TARGET_S390X_CPU_MODELS_H
  14#define TARGET_S390X_CPU_MODELS_H
  15
  16#include "cpu_features.h"
  17#include "target/s390x/gen-features.h"
  18#include "hw/core/cpu.h"
  19
  20/* static CPU definition */
  21struct S390CPUDef {
  22    const char *name;       /* name exposed to the user */
  23    const char *desc;       /* description exposed to the user */
  24    uint8_t gen;            /* hw generation identification */
  25    uint16_t type;          /* cpu type identification */
  26    uint8_t ec_ga;          /* EC GA version (on which also the BC is based) */
  27    uint8_t mha_pow;        /* maximum host address power, mha = 2^pow-1 */
  28    uint32_t hmfai;         /* hypervisor-managed facilities */
  29    /* base/min features, must never be changed between QEMU versions */
  30    S390FeatBitmap base_feat;
  31    /* used to init base_feat from generated data */
  32    S390FeatInit base_init;
  33    /* default features, QEMU version specific */
  34    S390FeatBitmap default_feat;
  35    /* used to init default_feat from generated data */
  36    S390FeatInit default_init;
  37    /* max allowed features, QEMU version specific */
  38    S390FeatBitmap full_feat;
  39    /* used to init full_feat from generated data */
  40    S390FeatInit full_init;
  41};
  42
  43/* CPU model based on a CPU definition */
  44struct S390CPUModel {
  45    const S390CPUDef *def;
  46    S390FeatBitmap features;
  47    /* values copied from the "host" model, can change during migration */
  48    uint16_t lowest_ibc;    /* lowest IBC that the hardware supports */
  49    uint32_t cpu_id;        /* CPU id */
  50    uint8_t cpu_id_format;  /* CPU id format bit */
  51    uint8_t cpu_ver;        /* CPU version, usually "ff" for kvm */
  52};
  53
  54/*
  55 * CPU ID
  56 *
  57 * bits 0-7: Zeroes (ff for kvm)
  58 * bits 8-31: CPU ID (serial number)
  59 * bits 32-47: Machine type
  60 * bit  48: CPU ID format
  61 * bits 49-63: Zeroes
  62 */
  63#define cpuid_type(x)     (((x) >> 16) & 0xffff)
  64#define cpuid_id(x)       (((x) >> 32) & 0xffffff)
  65#define cpuid_ver(x)      (((x) >> 56) & 0xff)
  66#define cpuid_format(x)   (((x) >> 15) & 0x1)
  67
  68#define lowest_ibc(x)     (((uint32_t)(x) >> 16) & 0xfff)
  69#define unblocked_ibc(x)  ((uint32_t)(x) & 0xfff)
  70#define has_ibc(x)        (lowest_ibc(x) != 0)
  71
  72#define S390_GEN_Z10 0xa
  73#define ibc_gen(x)        (x == 0 ? 0 : ((x >> 4) + S390_GEN_Z10))
  74#define ibc_ec_ga(x)      (x & 0xf)
  75
  76void s390_cpudef_featoff(uint8_t gen, uint8_t ec_ga, S390Feat feat);
  77void s390_cpudef_featoff_greater(uint8_t gen, uint8_t ec_ga, S390Feat feat);
  78void s390_cpudef_group_featoff_greater(uint8_t gen, uint8_t ec_ga,
  79                                       S390FeatGroup group);
  80uint32_t s390_get_hmfai(void);
  81uint8_t s390_get_mha_pow(void);
  82uint32_t s390_get_ibc_val(void);
  83static inline uint16_t s390_ibc_from_cpu_model(const S390CPUModel *model)
  84{
  85    uint16_t ibc = 0;
  86
  87    if (model->def->gen >= S390_GEN_Z10) {
  88        ibc = ((model->def->gen - S390_GEN_Z10) << 4) + model->def->ec_ga;
  89    }
  90    return ibc;
  91}
  92void s390_get_feat_block(S390FeatType type, uint8_t *data);
  93bool s390_has_feat(S390Feat feat);
  94uint8_t s390_get_gen_for_cpu_type(uint16_t type);
  95static inline bool s390_known_cpu_type(uint16_t type)
  96{
  97    return s390_get_gen_for_cpu_type(type) != 0;
  98}
  99#define CPU_ID_SHIFT 32
 100#define CPU_ID_BITS 24
 101/*
 102 * When cpu_id_format is 0 (basic mode), the leftmost 4 bits of cpu_id contain
 103 * the rightmost 4 bits of the physical CPU address.
 104 */
 105#define CPU_PHYS_ADDR_BITS 4
 106#define CPU_PHYS_ADDR_SHIFT (CPU_ID_SHIFT + CPU_ID_BITS - CPU_PHYS_ADDR_BITS)
 107static inline uint64_t s390_cpuid_from_cpu_model(const S390CPUModel *model)
 108{
 109    return ((uint64_t)model->cpu_ver << 56) |
 110           ((uint64_t)model->cpu_id << CPU_ID_SHIFT) |
 111           ((uint64_t)model->def->type << 16) |
 112           (model->def->gen == 7 ? 0 : (uint64_t)model->cpu_id_format << 15);
 113}
 114S390CPUDef const *s390_find_cpu_def(uint16_t type, uint8_t gen, uint8_t ec_ga,
 115                                    S390FeatBitmap features);
 116
 117#ifdef CONFIG_KVM
 118bool kvm_s390_cpu_models_supported(void);
 119void kvm_s390_get_host_cpu_model(S390CPUModel *model, Error **errp);
 120void kvm_s390_apply_cpu_model(const S390CPUModel *model,  Error **errp);
 121#else
 122static inline void kvm_s390_get_host_cpu_model(S390CPUModel *model,
 123                                               Error **errp)
 124{
 125}
 126static inline void kvm_s390_apply_cpu_model(const S390CPUModel *model,
 127                                            Error **errp)
 128{
 129}
 130static inline bool kvm_s390_cpu_models_supported(void)
 131{
 132    return false;
 133}
 134#endif
 135
 136#endif /* TARGET_S390X_CPU_MODELS_H */
 137