target/arm/kvm_arm.h

   1 /*
   2  * QEMU KVM support -- ARM specific functions.
   3  *
   4  * Copyright (c) 2012 Linaro Limited
   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
  11 #ifndef QEMU_KVM_ARM_H
  12 #define QEMU_KVM_ARM_H
  13
  14 #include "sysemu/kvm.h"
  15 #include "exec/memory.h"
  16 #include "qemu/error-report.h"
  17
  18 #define KVM_ARM_VGIC_V2   (1 << 0)
  19 #define KVM_ARM_VGIC_V3   (1 << 1)
  20
  21 /**
  22  * kvm_arm_register_device:
  23  * @mr: memory region for this device
  24  * @devid: the KVM device ID
  25  * @group: device control API group for setting addresses
  26  * @attr: device control API address type
  27  * @dev_fd: device control device file descriptor (or -1 if not supported)
  28  * @addr_ormask: value to be OR'ed with resolved address
  29  *
  30  * Remember the memory region @mr, and when it is mapped by the
  31  * machine model, tell the kernel that base address using the
  32  * KVM_ARM_SET_DEVICE_ADDRESS ioctl or the newer device control API.  @devid
  33  * should be the ID of the device as defined by KVM_ARM_SET_DEVICE_ADDRESS or
  34  * the arm-vgic device in the device control API.
  35  * The machine model may map
  36  * and unmap the device multiple times; the kernel will only be told the final
  37  * address at the point where machine init is complete.
  38  */
  39 void kvm_arm_register_device(MemoryRegion *mr, uint64_t devid, uint64_t group,
  40                              uint64_t attr, int dev_fd, uint64_t addr_ormask);
  41
  42 /**
  43  * write_list_to_kvmstate:
  44  * @cpu: ARMCPU
  45  * @level: the state level to sync
  46  *
  47  * For each register listed in the ARMCPU cpreg_indexes list, write
  48  * its value from the cpreg_values list into the kernel (via ioctl).
  49  * This updates KVM's working data structures from TCG data or
  50  * from incoming migration state.
  51  *
  52  * Returns: true if all register values were updated correctly,
  53  * false if some register was unknown to the kernel or could not
  54  * be written (eg constant register with the wrong value).
  55  * Note that we do not stop early on failure -- we will attempt
  56  * writing all registers in the list.
  57  */
  58 bool write_list_to_kvmstate(ARMCPU *cpu, int level);
  59
  60 /**
  61  * write_kvmstate_to_list:
  62  * @cpu: ARMCPU
  63  *
  64  * For each register listed in the ARMCPU cpreg_indexes list, write
  65  * its value from the kernel into the cpreg_values list. This is used to
  66  * copy info from KVM's working data structures into TCG or
  67  * for outbound migration.
  68  *
  69  * Returns: true if all register values were read correctly,
  70  * false if some register was unknown or could not be read.
  71  * Note that we do not stop early on failure -- we will attempt
  72  * reading all registers in the list.
  73  */
  74 bool write_kvmstate_to_list(ARMCPU *cpu);
  75
  76 /**
  77  * kvm_arm_cpu_pre_save:
  78  * @cpu: ARMCPU
  79  *
  80  * Called after write_kvmstate_to_list() from cpu_pre_save() to update
  81  * the cpreg list with KVM CPU state.
  82  */
  83 void kvm_arm_cpu_pre_save(ARMCPU *cpu);
  84
  85 /**
  86  * kvm_arm_cpu_post_load:
  87  * @cpu: ARMCPU
  88  *
  89  * Called from cpu_post_load() to update KVM CPU state from the cpreg list.
  90  */
  91 void kvm_arm_cpu_post_load(ARMCPU *cpu);
  92
  93 /**
  94  * kvm_arm_reset_vcpu:
  95  * @cpu: ARMCPU
  96  *
  97  * Called at reset time to kernel registers to their initial values.
  98  */
  99 void kvm_arm_reset_vcpu(ARMCPU *cpu);
 100
 101 #ifdef CONFIG_KVM
 102 /**
 103  * kvm_arm_create_scratch_host_vcpu:
 104  * @cpus_to_try: array of QEMU_KVM_ARM_TARGET_* values (terminated with
 105  * QEMU_KVM_ARM_TARGET_NONE) to try as fallback if the kernel does not
 106  * know the PREFERRED_TARGET ioctl. Passing NULL is the same as passing
 107  * an empty array.
 108  * @fdarray: filled in with kvmfd, vmfd, cpufd file descriptors in that order
 109  * @init: filled in with the necessary values for creating a host
 110  * vcpu. If NULL is provided, will not init the vCPU (though the cpufd
 111  * will still be set up).
 112  *
 113  * Create a scratch vcpu in its own VM of the type preferred by the host
 114  * kernel (as would be used for '-cpu host'), for purposes of probing it
 115  * for capabilities.
 116  *
 117  * Returns: true on success (and fdarray and init are filled in),
 118  * false on failure (and fdarray and init are not valid).
 119  */
 120 bool kvm_arm_create_scratch_host_vcpu(const uint32_t *cpus_to_try,
 121                                       int *fdarray,
 122                                       struct kvm_vcpu_init *init);
 123
 124 /**
 125  * kvm_arm_destroy_scratch_host_vcpu:
 126  * @fdarray: array of fds as set up by kvm_arm_create_scratch_host_vcpu
 127  *
 128  * Tear down the scratch vcpu created by kvm_arm_create_scratch_host_vcpu.
 129  */
 130 void kvm_arm_destroy_scratch_host_vcpu(int *fdarray);
 131
 132 /**
 133  * kvm_arm_sve_get_vls:
 134  * @cs: CPUState
 135  *
 136  * Get all the SVE vector lengths supported by the KVM host, setting
 137  * the bits corresponding to their length in quadwords minus one
 138  * (vq - 1) up to ARM_MAX_VQ.  Return the resulting map.
 139  */
 140 uint32_t kvm_arm_sve_get_vls(CPUState *cs);
 141
 142 /**
 143  * kvm_arm_set_cpu_features_from_host:
 144  * @cpu: ARMCPU to set the features for
 145  *
 146  * Set up the ARMCPU struct fields up to match the information probed
 147  * from the host CPU.
 148  */
 149 void kvm_arm_set_cpu_features_from_host(ARMCPU *cpu);
 150
 151 /**
 152  * kvm_arm_add_vcpu_properties:
 153  * @obj: The CPU object to add the properties to
 154  *
 155  * Add all KVM specific CPU properties to the CPU object. These
 156  * are the CPU properties with "kvm-" prefixed names.
 157  */
 158 void kvm_arm_add_vcpu_properties(Object *obj);
 159
 160 /**
 161  * kvm_arm_steal_time_finalize:
 162  * @cpu: ARMCPU for which to finalize kvm-steal-time
 163  * @errp: Pointer to Error* for error propagation
 164  *
 165  * Validate the kvm-steal-time property selection and set its default
 166  * based on KVM support and guest configuration.
 167  */
 168 void kvm_arm_steal_time_finalize(ARMCPU *cpu, Error **errp);
 169
 170 /**
 171  * kvm_arm_aarch32_supported:
 172  *
 173  * Returns: true if KVM can enable AArch32 mode
 174  * and false otherwise.
 175  */
 176 bool kvm_arm_aarch32_supported(void);
 177
 178 /**
 179  * kvm_arm_pmu_supported:
 180  *
 181  * Returns: true if KVM can enable the PMU
 182  * and false otherwise.
 183  */
 184 bool kvm_arm_pmu_supported(void);
 185
 186 /**
 187  * kvm_arm_sve_supported:
 188  *
 189  * Returns true if KVM can enable SVE and false otherwise.
 190  */
 191 bool kvm_arm_sve_supported(void);
 192
 193 /**
 194  * kvm_arm_get_max_vm_ipa_size:
 195  * @ms: Machine state handle
 196  * @fixed_ipa: True when the IPA limit is fixed at 40. This is the case
 197  * for legacy KVM.
 198  *
 199  * Returns the number of bits in the IPA address space supported by KVM
 200  */
 201 int kvm_arm_get_max_vm_ipa_size(MachineState *ms, bool *fixed_ipa);
 202
 203 void kvm_arm_vm_state_change(void *opaque, bool running, RunState state);
 204
 205 int kvm_arm_vgic_probe(void);
 206
 207 void kvm_arm_pmu_set_irq(CPUState *cs, int irq);
 208 void kvm_arm_pmu_init(CPUState *cs);
 209
 210 /**
 211  * kvm_arm_pvtime_init:
 212  * @cs: CPUState
 213  * @ipa: Per-vcpu guest physical base address of the pvtime structures
 214  *
 215  * Initializes PVTIME for the VCPU, setting the PVTIME IPA to @ipa.
 216  */
 217 void kvm_arm_pvtime_init(CPUState *cs, uint64_t ipa);
 218
 219 int kvm_arm_set_irq(int cpu, int irqtype, int irq, int level);
 220
 221 #else
 222
 223 /*
 224  * It's safe to call these functions without KVM support.
 225  * They should either do nothing or return "not supported".
 226  */
 227 static inline bool kvm_arm_aarch32_supported(void)
 228 {
 229     return false;
 230 }
 231
 232 static inline bool kvm_arm_pmu_supported(void)
 233 {
 234     return false;
 235 }
 236
 237 static inline bool kvm_arm_sve_supported(void)
 238 {
 239     return false;
 240 }
 241
 242 /*
 243  * These functions should never actually be called without KVM support.
 244  */
 245 static inline void kvm_arm_set_cpu_features_from_host(ARMCPU *cpu)
 246 {
 247     g_assert_not_reached();
 248 }
 249
 250 static inline void kvm_arm_add_vcpu_properties(Object *obj)
 251 {
 252     g_assert_not_reached();
 253 }
 254
 255 static inline int kvm_arm_get_max_vm_ipa_size(MachineState *ms, bool *fixed_ipa)
 256 {
 257     g_assert_not_reached();
 258 }
 259
 260 static inline int kvm_arm_vgic_probe(void)
 261 {
 262     g_assert_not_reached();
 263 }
 264
 265 static inline void kvm_arm_pmu_set_irq(CPUState *cs, int irq)
 266 {
 267     g_assert_not_reached();
 268 }
 269
 270 static inline void kvm_arm_pmu_init(CPUState *cs)
 271 {
 272     g_assert_not_reached();
 273 }
 274
 275 static inline void kvm_arm_pvtime_init(CPUState *cs, uint64_t ipa)
 276 {
 277     g_assert_not_reached();
 278 }
 279
 280 static inline void kvm_arm_steal_time_finalize(ARMCPU *cpu, Error **errp)
 281 {
 282     g_assert_not_reached();
 283 }
 284
 285 static inline uint32_t kvm_arm_sve_get_vls(CPUState *cs)
 286 {
 287     g_assert_not_reached();
 288 }
 289
 290 #endif
 291
 292 #endif