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
  17 /**
  18  * kvm_arm_vcpu_init:
  19  * @cs: CPUState
  20  *
  21  * Initialize (or reinitialize) the VCPU by invoking the
  22  * KVM_ARM_VCPU_INIT ioctl with the CPU type and feature
  23  * bitmask specified in the CPUState.
  24  *
  25  * Returns: 0 if success else < 0 error code
  26  */
  27 int kvm_arm_vcpu_init(CPUState *cs);
  28
  29 /**
  30  * kvm_arm_register_device:
  31  * @mr: memory region for this device
  32  * @devid: the KVM device ID
  33  * @group: device control API group for setting addresses
  34  * @attr: device control API address type
  35  * @dev_fd: device control device file descriptor (or -1 if not supported)
  36  *
  37  * Remember the memory region @mr, and when it is mapped by the
  38  * machine model, tell the kernel that base address using the
  39  * KVM_ARM_SET_DEVICE_ADDRESS ioctl or the newer device control API.  @devid
  40  * should be the ID of the device as defined by KVM_ARM_SET_DEVICE_ADDRESS or
  41  * the arm-vgic device in the device control API.
  42  * The machine model may map
  43  * and unmap the device multiple times; the kernel will only be told the final
  44  * address at the point where machine init is complete.
  45  */
  46 void kvm_arm_register_device(MemoryRegion *mr, uint64_t devid, uint64_t group,
  47                              uint64_t attr, int dev_fd);
  48
  49 /**
  50  * kvm_arm_init_cpreg_list:
  51  * @cs: CPUState
  52  *
  53  * Initialize the CPUState's cpreg list according to the kernel's
  54  * definition of what CPU registers it knows about (and throw away
  55  * the previous TCG-created cpreg list).
  56  *
  57  * Returns: 0 if success, else < 0 error code
  58  */
  59 int kvm_arm_init_cpreg_list(ARMCPU *cpu);
  60
  61 /**
  62  * kvm_arm_reg_syncs_via_cpreg_list
  63  * regidx: KVM register index
  64  *
  65  * Return true if this KVM register should be synchronized via the
  66  * cpreg list of arbitrary system registers, false if it is synchronized
  67  * by hand using code in kvm_arch_get/put_registers().
  68  */
  69 bool kvm_arm_reg_syncs_via_cpreg_list(uint64_t regidx);
  70
  71 /**
  72  * kvm_arm_cpreg_level
  73  * regidx: KVM register index
  74  *
  75  * Return the level of this coprocessor/system register.  Return value is
  76  * either KVM_PUT_RUNTIME_STATE, KVM_PUT_RESET_STATE, or KVM_PUT_FULL_STATE.
  77  */
  78 int kvm_arm_cpreg_level(uint64_t regidx);
  79
  80 /**
  81  * write_list_to_kvmstate:
  82  * @cpu: ARMCPU
  83  * @level: the state level to sync
  84  *
  85  * For each register listed in the ARMCPU cpreg_indexes list, write
  86  * its value from the cpreg_values list into the kernel (via ioctl).
  87  * This updates KVM's working data structures from TCG data or
  88  * from incoming migration state.
  89  *
  90  * Returns: true if all register values were updated correctly,
  91  * false if some register was unknown to the kernel or could not
  92  * be written (eg constant register with the wrong value).
  93  * Note that we do not stop early on failure -- we will attempt
  94  * writing all registers in the list.
  95  */
  96 bool write_list_to_kvmstate(ARMCPU *cpu, int level);
  97
  98 /**
  99  * write_kvmstate_to_list:
 100  * @cpu: ARMCPU
 101  *
 102  * For each register listed in the ARMCPU cpreg_indexes list, write
 103  * its value from the kernel into the cpreg_values list. This is used to
 104  * copy info from KVM's working data structures into TCG or
 105  * for outbound migration.
 106  *
 107  * Returns: true if all register values were read correctly,
 108  * false if some register was unknown or could not be read.
 109  * Note that we do not stop early on failure -- we will attempt
 110  * reading all registers in the list.
 111  */
 112 bool write_kvmstate_to_list(ARMCPU *cpu);
 113
 114 /**
 115  * kvm_arm_reset_vcpu:
 116  * @cpu: ARMCPU
 117  *
 118  * Called at reset time to kernel registers to their initial values.
 119  */
 120 void kvm_arm_reset_vcpu(ARMCPU *cpu);
 121
 122 #ifdef CONFIG_KVM
 123 /**
 124  * kvm_arm_create_scratch_host_vcpu:
 125  * @cpus_to_try: array of QEMU_KVM_ARM_TARGET_* values (terminated with
 126  * QEMU_KVM_ARM_TARGET_NONE) to try as fallback if the kernel does not
 127  * know the PREFERRED_TARGET ioctl
 128  * @fdarray: filled in with kvmfd, vmfd, cpufd file descriptors in that order
 129  * @init: filled in with the necessary values for creating a host vcpu
 130  *
 131  * Create a scratch vcpu in its own VM of the type preferred by the host
 132  * kernel (as would be used for '-cpu host'), for purposes of probing it
 133  * for capabilities.
 134  *
 135  * Returns: true on success (and fdarray and init are filled in),
 136  * false on failure (and fdarray and init are not valid).
 137  */
 138 bool kvm_arm_create_scratch_host_vcpu(const uint32_t *cpus_to_try,
 139                                       int *fdarray,
 140                                       struct kvm_vcpu_init *init);
 141
 142 /**
 143  * kvm_arm_destroy_scratch_host_vcpu:
 144  * @fdarray: array of fds as set up by kvm_arm_create_scratch_host_vcpu
 145  *
 146  * Tear down the scratch vcpu created by kvm_arm_create_scratch_host_vcpu.
 147  */
 148 void kvm_arm_destroy_scratch_host_vcpu(int *fdarray);
 149
 150 #define TYPE_ARM_HOST_CPU "host-" TYPE_ARM_CPU
 151 #define ARM_HOST_CPU_CLASS(klass) \
 152     OBJECT_CLASS_CHECK(ARMHostCPUClass, (klass), TYPE_ARM_HOST_CPU)
 153 #define ARM_HOST_CPU_GET_CLASS(obj) \
 154     OBJECT_GET_CLASS(ARMHostCPUClass, (obj), TYPE_ARM_HOST_CPU)
 155
 156 typedef struct ARMHostCPUClass {
 157     /*< private >*/
 158     ARMCPUClass parent_class;
 159     /*< public >*/
 160
 161     uint64_t features;
 162     uint32_t target;
 163     const char *dtb_compatible;
 164 } ARMHostCPUClass;
 165
 166 /**
 167  * kvm_arm_get_host_cpu_features:
 168  * @ahcc: ARMHostCPUClass to fill in
 169  *
 170  * Probe the capabilities of the host kernel's preferred CPU and fill
 171  * in the ARMHostCPUClass struct accordingly.
 172  */
 173 bool kvm_arm_get_host_cpu_features(ARMHostCPUClass *ahcc);
 174
 175
 176 /**
 177  * kvm_arm_sync_mpstate_to_kvm
 178  * @cpu: ARMCPU
 179  *
 180  * If supported set the KVM MP_STATE based on QEMU's model.
 181  */
 182 int kvm_arm_sync_mpstate_to_kvm(ARMCPU *cpu);
 183
 184 /**
 185  * kvm_arm_sync_mpstate_to_qemu
 186  * @cpu: ARMCPU
 187  *
 188  * If supported get the MP_STATE from KVM and store in QEMU's model.
 189  */
 190 int kvm_arm_sync_mpstate_to_qemu(ARMCPU *cpu);
 191
 192 int kvm_arm_vgic_probe(void);
 193
 194 #else
 195
 196 static inline int kvm_arm_vgic_probe(void)
 197 {
 198     return 0;
 199 }
 200
 201 #endif
 202
 203 static inline const char *gic_class_name(void)
 204 {
 205     return kvm_irqchip_in_kernel() ? "kvm-arm-gic" : "arm_gic";
 206 }
 207
 208 /**
 209  * gicv3_class_name
 210  *
 211  * Return name of GICv3 class to use depending on whether KVM acceleration is
 212  * in use. May throw an error if the chosen implementation is not available.
 213  *
 214  * Returns: class name to use
 215  */
 216 const char *gicv3_class_name(void);
 217
 218 #endif