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 "qom/cpu.h"
  18
  19/* static CPU definition */
  20typedef struct S390CPUDef {
  21    const char *name;       /* name exposed to the user */
  22    const char *desc;       /* description exposed to the user */
  23    uint8_t gen;            /* hw generation identification */
  24    uint16_t type;          /* cpu type identification */
  25    uint8_t ec_ga;          /* EC GA version (on which also the BC is based) */
  26    uint8_t mha_pow;        /* Maximum Host Adress Power, mha = 2^pow-1 */
  27    uint32_t hmfai;         /* hypervisor-managed facilities */
  28    /* base/min features, must never be changed between QEMU versions */
  29    S390FeatBitmap base_feat;
  30    /* used to init base_feat from generated data */
  31    S390FeatInit base_init;
  32    /* deafault features, QEMU version specific */
  33    S390FeatBitmap default_feat;
  34    /* used to init default_feat from generated data */
  35    S390FeatInit default_init;
  36    /* max allowed features, QEMU version specific */
  37    S390FeatBitmap full_feat;
  38    /* used to init full_feat from generated data */
  39    S390FeatInit full_init;
  40} S390CPUDef;
  41
  42/* CPU model based on a CPU definition */
  43typedef struct S390CPUModel {
  44    const S390CPUDef *def;
  45    S390FeatBitmap features;
  46    /* values copied from the "host" model, can change during migration */
  47    uint16_t lowest_ibc;    /* lowest IBC that the hardware supports */
  48    uint32_t cpu_id;        /* CPU id */
  49    uint8_t cpu_id_format;  /* CPU id format bit */
  50    uint8_t cpu_ver;        /* CPU version, usually "ff" for kvm */
  51} S390CPUModel;
  52
  53/*
  54 * CPU ID
  55 *
  56 * bits 0-7: Zeroes (ff for kvm)
  57 * bits 8-31: CPU ID (serial number)
  58 * bits 32-47: Machine type
  59 * bit  48: CPU ID format
  60 * bits 49-63: Zeroes
  61 */
  62#define cpuid_type(x)     (((x) >> 16) & 0xffff)
  63#define cpuid_id(x)       (((x) >> 32) & 0xffffff)
  64#define cpuid_ver(x)      (((x) >> 56) & 0xff)
  65#define cpuid_format(x)   (((x) >> 15) & 0x1)
  66
  67#define lowest_ibc(x)     (((uint32_t)(x) >> 16) & 0xfff)
  68#define unblocked_ibc(x)  ((uint32_t)(x) & 0xfff)
  69#define has_ibc(x)        (lowest_ibc(x) != 0)
  70
  71#define S390_GEN_Z10 0xa
  72#define ibc_gen(x)        (x == 0 ? 0 : ((x >> 4) + S390_GEN_Z10))
  73#define ibc_ec_ga(x)      (x & 0xf)
  74
  75void s390_cpudef_featoff(uint8_t gen, uint8_t ec_ga, S390Feat feat);
  76void s390_cpudef_featoff_greater(uint8_t gen, uint8_t ec_ga, S390Feat feat);
  77uint32_t s390_get_hmfai(void);
  78uint8_t s390_get_mha_pow(void);
  79uint32_t s390_get_ibc_val(void);
  80static inline uint16_t s390_ibc_from_cpu_model(const S390CPUModel *model)
  81{
  82    uint16_t ibc = 0;
  83
  84    if (model->def->gen >= S390_GEN_Z10) {
  85        ibc = ((model->def->gen - S390_GEN_Z10) << 4) + model->def->ec_ga;
  86    }
  87    return ibc;
  88}
  89void s390_get_feat_block(S390FeatType type, uint8_t *data);
  90bool s390_has_feat(S390Feat feat);
  91uint8_t s390_get_gen_for_cpu_type(uint16_t type);
  92static inline bool s390_known_cpu_type(uint16_t type)
  93{
  94    return s390_get_gen_for_cpu_type(type) != 0;
  95}
  96static inline uint64_t s390_cpuid_from_cpu_model(const S390CPUModel *model)
  97{
  98    return ((uint64_t)model->cpu_ver << 56) |
  99           ((uint64_t)model->cpu_id << 32) |
 100           ((uint64_t)model->def->type << 16) |
 101           (model->def->gen == 7 ? 0 : (uint64_t)model->cpu_id_format << 15);
 102}
 103S390CPUDef const *s390_find_cpu_def(uint16_t type, uint8_t gen, uint8_t ec_ga,
 104                                    S390FeatBitmap features);
 105
 106#ifdef CONFIG_KVM
 107bool kvm_s390_cpu_models_supported(void);
 108void kvm_s390_get_host_cpu_model(S390CPUModel *model, Error **errp);
 109void kvm_s390_apply_cpu_model(const S390CPUModel *model,  Error **errp);
 110#else
 111static inline void kvm_s390_get_host_cpu_model(S390CPUModel *model,
 112                                               Error **errp)
 113{
 114}
 115static inline void kvm_s390_apply_cpu_model(const S390CPUModel *model,
 116                                            Error **errp)
 117{
 118}
 119static inline bool kvm_s390_cpu_models_supported(void)
 120{
 121    return false;
 122}
 123#endif
 124
 125#endif /* TARGET_S390X_CPU_MODELS_H */
 126