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 "gen-features.h"
  18#include "qom/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 Adress 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    /* deafault 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);
  78uint32_t s390_get_hmfai(void);
  79uint8_t s390_get_mha_pow(void);
  80uint32_t s390_get_ibc_val(void);
  81static inline uint16_t s390_ibc_from_cpu_model(const S390CPUModel *model)
  82{
  83    uint16_t ibc = 0;
  84
  85    if (model->def->gen >= S390_GEN_Z10) {
  86        ibc = ((model->def->gen - S390_GEN_Z10) << 4) + model->def->ec_ga;
  87    }
  88    return ibc;
  89}
  90void s390_get_feat_block(S390FeatType type, uint8_t *data);
  91bool s390_has_feat(S390Feat feat);
  92uint8_t s390_get_gen_for_cpu_type(uint16_t type);
  93static inline bool s390_known_cpu_type(uint16_t type)
  94{
  95    return s390_get_gen_for_cpu_type(type) != 0;
  96}
  97static inline uint64_t s390_cpuid_from_cpu_model(const S390CPUModel *model)
  98{
  99    return ((uint64_t)model->cpu_ver << 56) |
 100           ((uint64_t)model->cpu_id << 32) |
 101           ((uint64_t)model->def->type << 16) |
 102           (model->def->gen == 7 ? 0 : (uint64_t)model->cpu_id_format << 15);
 103}
 104S390CPUDef const *s390_find_cpu_def(uint16_t type, uint8_t gen, uint8_t ec_ga,
 105                                    S390FeatBitmap features);
 106
 107#ifdef CONFIG_KVM
 108bool kvm_s390_cpu_models_supported(void);
 109void kvm_s390_get_host_cpu_model(S390CPUModel *model, Error **errp);
 110void kvm_s390_apply_cpu_model(const S390CPUModel *model,  Error **errp);
 111#else
 112static inline void kvm_s390_get_host_cpu_model(S390CPUModel *model,
 113                                               Error **errp)
 114{
 115}
 116static inline void kvm_s390_apply_cpu_model(const S390CPUModel *model,
 117                                            Error **errp)
 118{
 119}
 120static inline bool kvm_s390_cpu_models_supported(void)
 121{
 122    return false;
 123}
 124#endif
 125
 126#endif /* TARGET_S390X_CPU_MODELS_H */
 127