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 /**
  19  * kvm_arm_vcpu_init:
  20  * @cs: CPUState
  21  *
  22  * Initialize (or reinitialize) the VCPU by invoking the
  23  * KVM_ARM_VCPU_INIT ioctl with the CPU type and feature
  24  * bitmask specified in the CPUState.
  25  *
  26  * Returns: 0 if success else < 0 error code
  27  */
  28 int kvm_arm_vcpu_init(CPUState *cs);
  29
  30 /**
  31  * kvm_arm_register_device:
  32  * @mr: memory region for this device
  33  * @devid: the KVM device ID
  34  * @group: device control API group for setting addresses
  35  * @attr: device control API address type
  36  * @dev_fd: device control device file descriptor (or -1 if not supported)
  37  * @addr_ormask: value to be OR'ed with resolved address
  38  *
  39  * Remember the memory region @mr, and when it is mapped by the
  40  * machine model, tell the kernel that base address using the
  41  * KVM_ARM_SET_DEVICE_ADDRESS ioctl or the newer device control API.  @devid
  42  * should be the ID of the device as defined by KVM_ARM_SET_DEVICE_ADDRESS or
  43  * the arm-vgic device in the device control API.
  44  * The machine model may map
  45  * and unmap the device multiple times; the kernel will only be told the final
  46  * address at the point where machine init is complete.
  47  */
  48 void kvm_arm_register_device(MemoryRegion *mr, uint64_t devid, uint64_t group,
  49                              uint64_t attr, int dev_fd, uint64_t addr_ormask);
  50
  51 /**
  52  * kvm_arm_init_cpreg_list:
  53  * @cpu: ARMCPU
  54  *
  55  * Initialize the ARMCPU cpreg list according to the kernel's
  56  * definition of what CPU registers it knows about (and throw away
  57  * the previous TCG-created cpreg list).
  58  *
  59  * Returns: 0 if success, else < 0 error code
  60  */
  61 int kvm_arm_init_cpreg_list(ARMCPU *cpu);
  62
  63 /**
  64  * kvm_arm_reg_syncs_via_cpreg_list
  65  * regidx: KVM register index
  66  *
  67  * Return true if this KVM register should be synchronized via the
  68  * cpreg list of arbitrary system registers, false if it is synchronized
  69  * by hand using code in kvm_arch_get/put_registers().
  70  */
  71 bool kvm_arm_reg_syncs_via_cpreg_list(uint64_t regidx);
  72
  73 /**
  74  * kvm_arm_cpreg_level
  75  * regidx: KVM register index
  76  *
  77  * Return the level of this coprocessor/system register.  Return value is
  78  * either KVM_PUT_RUNTIME_STATE, KVM_PUT_RESET_STATE, or KVM_PUT_FULL_STATE.
  79  */
  80 int kvm_arm_cpreg_level(uint64_t regidx);
  81
  82 /**
  83  * write_list_to_kvmstate:
  84  * @cpu: ARMCPU
  85  * @level: the state level to sync
  86  *
  87  * For each register listed in the ARMCPU cpreg_indexes list, write
  88  * its value from the cpreg_values list into the kernel (via ioctl).
  89  * This updates KVM's working data structures from TCG data or
  90  * from incoming migration state.
  91  *
  92  * Returns: true if all register values were updated correctly,
  93  * false if some register was unknown to the kernel or could not
  94  * be written (eg constant register with the wrong value).
  95  * Note that we do not stop early on failure -- we will attempt
  96  * writing all registers in the list.
  97  */
  98 bool write_list_to_kvmstate(ARMCPU *cpu, int level);
  99
 100 /**
 101  * write_kvmstate_to_list:
 102  * @cpu: ARMCPU
 103  *
 104  * For each register listed in the ARMCPU cpreg_indexes list, write
 105  * its value from the kernel into the cpreg_values list. This is used to
 106  * copy info from KVM's working data structures into TCG or
 107  * for outbound migration.
 108  *
 109  * Returns: true if all register values were read correctly,
 110  * false if some register was unknown or could not be read.
 111  * Note that we do not stop early on failure -- we will attempt
 112  * reading all registers in the list.
 113  */
 114 bool write_kvmstate_to_list(ARMCPU *cpu);
 115
 116 /**
 117  * kvm_arm_reset_vcpu:
 118  * @cpu: ARMCPU
 119  *
 120  * Called at reset time to kernel registers to their initial values.
 121  */
 122 void kvm_arm_reset_vcpu(ARMCPU *cpu);
 123
 124 #ifdef CONFIG_KVM
 125 /**
 126  * kvm_arm_create_scratch_host_vcpu:
 127  * @cpus_to_try: array of QEMU_KVM_ARM_TARGET_* values (terminated with
 128  * QEMU_KVM_ARM_TARGET_NONE) to try as fallback if the kernel does not
 129  * know the PREFERRED_TARGET ioctl. Passing NULL is the same as passing
 130  * an empty array.
 131  * @fdarray: filled in with kvmfd, vmfd, cpufd file descriptors in that order
 132  * @init: filled in with the necessary values for creating a host
 133  * vcpu. If NULL is provided, will not init the vCPU (though the cpufd
 134  * will still be set up).
 135  *
 136  * Create a scratch vcpu in its own VM of the type preferred by the host
 137  * kernel (as would be used for '-cpu host'), for purposes of probing it
 138  * for capabilities.
 139  *
 140  * Returns: true on success (and fdarray and init are filled in),
 141  * false on failure (and fdarray and init are not valid).
 142  */
 143 bool kvm_arm_create_scratch_host_vcpu(const uint32_t *cpus_to_try,
 144                                       int *fdarray,
 145                                       struct kvm_vcpu_init *init);
 146
 147 /**
 148  * kvm_arm_destroy_scratch_host_vcpu:
 149  * @fdarray: array of fds as set up by kvm_arm_create_scratch_host_vcpu
 150  *
 151  * Tear down the scratch vcpu created by kvm_arm_create_scratch_host_vcpu.
 152  */
 153 void kvm_arm_destroy_scratch_host_vcpu(int *fdarray);
 154
 155 #define TYPE_ARM_HOST_CPU "host-" TYPE_ARM_CPU
 156
 157 /**
 158  * ARMHostCPUFeatures: information about the host CPU (identified
 159  * by asking the host kernel)
 160  */
 161 typedef struct ARMHostCPUFeatures {
 162     uint64_t features;
 163     uint32_t target;
 164     const char *dtb_compatible;
 165 } ARMHostCPUFeatures;
 166
 167 /**
 168  * kvm_arm_get_host_cpu_features:
 169  * @ahcc: ARMHostCPUClass to fill in
 170  *
 171  * Probe the capabilities of the host kernel's preferred CPU and fill
 172  * in the ARMHostCPUClass struct accordingly.
 173  */
 174 bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf);
 175
 176 /**
 177  * kvm_arm_set_cpu_features_from_host:
 178  * @cpu: ARMCPU to set the features for
 179  *
 180  * Set up the ARMCPU struct fields up to match the information probed
 181  * from the host CPU.
 182  */
 183 void kvm_arm_set_cpu_features_from_host(ARMCPU *cpu);
 184
 185 /**
 186  * kvm_arm_sync_mpstate_to_kvm
 187  * @cpu: ARMCPU
 188  *
 189  * If supported set the KVM MP_STATE based on QEMU's model.
 190  */
 191 int kvm_arm_sync_mpstate_to_kvm(ARMCPU *cpu);
 192
 193 /**
 194  * kvm_arm_sync_mpstate_to_qemu
 195  * @cpu: ARMCPU
 196  *
 197  * If supported get the MP_STATE from KVM and store in QEMU's model.
 198  */
 199 int kvm_arm_sync_mpstate_to_qemu(ARMCPU *cpu);
 200
 201 int kvm_arm_vgic_probe(void);
 202
 203 void kvm_arm_pmu_set_irq(CPUState *cs, int irq);
 204 void kvm_arm_pmu_init(CPUState *cs);
 205
 206 #else
 207
 208 static inline void kvm_arm_set_cpu_features_from_host(ARMCPU *cpu)
 209 {
 210     /* This should never actually be called in the "not KVM" case,
 211      * but set up the fields to indicate an error anyway.
 212      */
 213     cpu->kvm_target = QEMU_KVM_ARM_TARGET_NONE;
 214     cpu->host_cpu_probe_failed = true;
 215 }
 216
 217 static inline int kvm_arm_vgic_probe(void)
 218 {
 219     return 0;
 220 }
 221
 222 static inline void kvm_arm_pmu_set_irq(CPUState *cs, int irq) {}
 223 static inline void kvm_arm_pmu_init(CPUState *cs) {}
 224
 225 #endif
 226
 227 static inline const char *gic_class_name(void)
 228 {
 229     return kvm_irqchip_in_kernel() ? "kvm-arm-gic" : "arm_gic";
 230 }
 231
 232 /**
 233  * gicv3_class_name
 234  *
 235  * Return name of GICv3 class to use depending on whether KVM acceleration is
 236  * in use. May throw an error if the chosen implementation is not available.
 237  *
 238  * Returns: class name to use
 239  */
 240 static inline const char *gicv3_class_name(void)
 241 {
 242     if (kvm_irqchip_in_kernel()) {
 243 #ifdef TARGET_AARCH64
 244         return "kvm-arm-gicv3";
 245 #else
 246         error_report("KVM GICv3 acceleration is not supported on this "
 247                      "platform");
 248         exit(1);
 249 #endif
 250     } else {
 251         if (kvm_enabled()) {
 252             error_report("Userspace GICv3 is not supported with KVM");
 253             exit(1);
 254         }
 255         return "arm-gicv3";
 256     }
 257 }
 258
 259 /**
 260  * kvm_arm_handle_debug:
 261  * @cs: CPUState
 262  * @debug_exit: debug part of the KVM exit structure
 263  *
 264  * Returns: TRUE if the debug exception was handled.
 265  */
 266 bool kvm_arm_handle_debug(CPUState *cs, struct kvm_debug_exit_arch *debug_exit);
 267
 268 /**
 269  * kvm_arm_hw_debug_active:
 270  * @cs: CPU State
 271  *
 272  * Return: TRUE if any hardware breakpoints in use.
 273  */
 274
 275 bool kvm_arm_hw_debug_active(CPUState *cs);
 276
 277 /**
 278  * kvm_arm_copy_hw_debug_data:
 279  *
 280  * @ptr: kvm_guest_debug_arch structure
 281  *
 282  * Copy the architecture specific debug registers into the
 283  * kvm_guest_debug ioctl structure.
 284  */
 285 struct kvm_guest_debug_arch;
 286
 287 void kvm_arm_copy_hw_debug_data(struct kvm_guest_debug_arch *ptr);
 288
 289 /**
 290  * its_class_name
 291  *
 292  * Return the ITS class name to use depending on whether KVM acceleration
 293  * and KVM CAP_SIGNAL_MSI are supported
 294  *
 295  * Returns: class name to use or NULL
 296  */
 297 static inline const char *its_class_name(void)
 298 {
 299     if (kvm_irqchip_in_kernel()) {
 300         /* KVM implementation requires this capability */
 301         return kvm_direct_msi_enabled() ? "arm-its-kvm" : NULL;
 302     } else {
 303         /* Software emulation is not implemented yet */
 304         return NULL;
 305     }
 306 }
 307
 308 #endif