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  * write_list_to_kvmstate:
  73  * @cpu: ARMCPU
  74  *
  75  * For each register listed in the ARMCPU cpreg_indexes list, write
  76  * its value from the cpreg_values list into the kernel (via ioctl).
  77  * This updates KVM's working data structures from TCG data or
  78  * from incoming migration state.
  79  *
  80  * Returns: true if all register values were updated correctly,
  81  * false if some register was unknown to the kernel or could not
  82  * be written (eg constant register with the wrong value).
  83  * Note that we do not stop early on failure -- we will attempt
  84  * writing all registers in the list.
  85  */
  86 bool write_list_to_kvmstate(ARMCPU *cpu);
  87
  88 /**
  89  * write_kvmstate_to_list:
  90  * @cpu: ARMCPU
  91  *
  92  * For each register listed in the ARMCPU cpreg_indexes list, write
  93  * its value from the kernel into the cpreg_values list. This is used to
  94  * copy info from KVM's working data structures into TCG or
  95  * for outbound migration.
  96  *
  97  * Returns: true if all register values were read correctly,
  98  * false if some register was unknown or could not be read.
  99  * Note that we do not stop early on failure -- we will attempt
 100  * reading all registers in the list.
 101  */
 102 bool write_kvmstate_to_list(ARMCPU *cpu);
 103
 104 /**
 105  * kvm_arm_reset_vcpu:
 106  * @cpu: ARMCPU
 107  *
 108  * Called at reset time to kernel registers to their initial values.
 109  */
 110 void kvm_arm_reset_vcpu(ARMCPU *cpu);
 111
 112 #ifdef CONFIG_KVM
 113 /**
 114  * kvm_arm_create_scratch_host_vcpu:
 115  * @cpus_to_try: array of QEMU_KVM_ARM_TARGET_* values (terminated with
 116  * QEMU_KVM_ARM_TARGET_NONE) to try as fallback if the kernel does not
 117  * know the PREFERRED_TARGET ioctl
 118  * @fdarray: filled in with kvmfd, vmfd, cpufd file descriptors in that order
 119  * @init: filled in with the necessary values for creating a host vcpu
 120  *
 121  * Create a scratch vcpu in its own VM of the type preferred by the host
 122  * kernel (as would be used for '-cpu host'), for purposes of probing it
 123  * for capabilities.
 124  *
 125  * Returns: true on success (and fdarray and init are filled in),
 126  * false on failure (and fdarray and init are not valid).
 127  */
 128 bool kvm_arm_create_scratch_host_vcpu(const uint32_t *cpus_to_try,
 129                                       int *fdarray,
 130                                       struct kvm_vcpu_init *init);
 131
 132 /**
 133  * kvm_arm_destroy_scratch_host_vcpu:
 134  * @fdarray: array of fds as set up by kvm_arm_create_scratch_host_vcpu
 135  *
 136  * Tear down the scratch vcpu created by kvm_arm_create_scratch_host_vcpu.
 137  */
 138 void kvm_arm_destroy_scratch_host_vcpu(int *fdarray);
 139
 140 #define TYPE_ARM_HOST_CPU "host-" TYPE_ARM_CPU
 141 #define ARM_HOST_CPU_CLASS(klass) \
 142     OBJECT_CLASS_CHECK(ARMHostCPUClass, (klass), TYPE_ARM_HOST_CPU)
 143 #define ARM_HOST_CPU_GET_CLASS(obj) \
 144     OBJECT_GET_CLASS(ARMHostCPUClass, (obj), TYPE_ARM_HOST_CPU)
 145
 146 typedef struct ARMHostCPUClass {
 147     /*< private >*/
 148     ARMCPUClass parent_class;
 149     /*< public >*/
 150
 151     uint64_t features;
 152     uint32_t target;
 153     const char *dtb_compatible;
 154 } ARMHostCPUClass;
 155
 156 /**
 157  * kvm_arm_get_host_cpu_features:
 158  * @ahcc: ARMHostCPUClass to fill in
 159  *
 160  * Probe the capabilities of the host kernel's preferred CPU and fill
 161  * in the ARMHostCPUClass struct accordingly.
 162  */
 163 bool kvm_arm_get_host_cpu_features(ARMHostCPUClass *ahcc);
 164
 165 #endif
 166
 167 #endif