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![Alex Bennée](/assets/img/avatar_default.png)
This adds the saving and restore of the current Multi-Processing state of the machine. While the KVM_GET/SET_MP_STATE API exposes a number of potential states for x86 we only use two for ARM. Either the process is running or not. We then save this state into the cpu_powered TCG state to avoid changing the serialisation format. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
185 lines
5.6 KiB
C
185 lines
5.6 KiB
C
/*
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* QEMU KVM support -- ARM specific functions.
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*
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* Copyright (c) 2012 Linaro Limited
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#ifndef QEMU_KVM_ARM_H
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#define QEMU_KVM_ARM_H
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#include "sysemu/kvm.h"
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#include "exec/memory.h"
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/**
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* kvm_arm_vcpu_init:
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* @cs: CPUState
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*
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* Initialize (or reinitialize) the VCPU by invoking the
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* KVM_ARM_VCPU_INIT ioctl with the CPU type and feature
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* bitmask specified in the CPUState.
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*
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* Returns: 0 if success else < 0 error code
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*/
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int kvm_arm_vcpu_init(CPUState *cs);
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/**
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* kvm_arm_register_device:
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* @mr: memory region for this device
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* @devid: the KVM device ID
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* @group: device control API group for setting addresses
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* @attr: device control API address type
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* @dev_fd: device control device file descriptor (or -1 if not supported)
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*
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* Remember the memory region @mr, and when it is mapped by the
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* machine model, tell the kernel that base address using the
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* KVM_ARM_SET_DEVICE_ADDRESS ioctl or the newer device control API. @devid
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* should be the ID of the device as defined by KVM_ARM_SET_DEVICE_ADDRESS or
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* the arm-vgic device in the device control API.
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* The machine model may map
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* and unmap the device multiple times; the kernel will only be told the final
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* address at the point where machine init is complete.
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*/
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void kvm_arm_register_device(MemoryRegion *mr, uint64_t devid, uint64_t group,
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uint64_t attr, int dev_fd);
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/**
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* kvm_arm_init_cpreg_list:
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* @cs: CPUState
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*
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* Initialize the CPUState's cpreg list according to the kernel's
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* definition of what CPU registers it knows about (and throw away
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* the previous TCG-created cpreg list).
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*
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* Returns: 0 if success, else < 0 error code
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*/
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int kvm_arm_init_cpreg_list(ARMCPU *cpu);
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/**
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* kvm_arm_reg_syncs_via_cpreg_list
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* regidx: KVM register index
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*
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* Return true if this KVM register should be synchronized via the
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* cpreg list of arbitrary system registers, false if it is synchronized
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* by hand using code in kvm_arch_get/put_registers().
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*/
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bool kvm_arm_reg_syncs_via_cpreg_list(uint64_t regidx);
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/**
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* write_list_to_kvmstate:
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* @cpu: ARMCPU
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*
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* For each register listed in the ARMCPU cpreg_indexes list, write
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* its value from the cpreg_values list into the kernel (via ioctl).
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* This updates KVM's working data structures from TCG data or
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* from incoming migration state.
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*
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* Returns: true if all register values were updated correctly,
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* false if some register was unknown to the kernel or could not
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* be written (eg constant register with the wrong value).
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* Note that we do not stop early on failure -- we will attempt
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* writing all registers in the list.
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*/
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bool write_list_to_kvmstate(ARMCPU *cpu);
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/**
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* write_kvmstate_to_list:
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* @cpu: ARMCPU
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*
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* For each register listed in the ARMCPU cpreg_indexes list, write
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* its value from the kernel into the cpreg_values list. This is used to
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* copy info from KVM's working data structures into TCG or
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* for outbound migration.
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*
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* Returns: true if all register values were read correctly,
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* false if some register was unknown or could not be read.
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* Note that we do not stop early on failure -- we will attempt
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* reading all registers in the list.
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*/
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bool write_kvmstate_to_list(ARMCPU *cpu);
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/**
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* kvm_arm_reset_vcpu:
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* @cpu: ARMCPU
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*
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* Called at reset time to kernel registers to their initial values.
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*/
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void kvm_arm_reset_vcpu(ARMCPU *cpu);
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#ifdef CONFIG_KVM
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/**
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* kvm_arm_create_scratch_host_vcpu:
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* @cpus_to_try: array of QEMU_KVM_ARM_TARGET_* values (terminated with
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* QEMU_KVM_ARM_TARGET_NONE) to try as fallback if the kernel does not
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* know the PREFERRED_TARGET ioctl
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* @fdarray: filled in with kvmfd, vmfd, cpufd file descriptors in that order
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* @init: filled in with the necessary values for creating a host vcpu
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*
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* Create a scratch vcpu in its own VM of the type preferred by the host
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* kernel (as would be used for '-cpu host'), for purposes of probing it
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* for capabilities.
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*
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* Returns: true on success (and fdarray and init are filled in),
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* false on failure (and fdarray and init are not valid).
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*/
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bool kvm_arm_create_scratch_host_vcpu(const uint32_t *cpus_to_try,
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int *fdarray,
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struct kvm_vcpu_init *init);
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/**
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* kvm_arm_destroy_scratch_host_vcpu:
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* @fdarray: array of fds as set up by kvm_arm_create_scratch_host_vcpu
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*
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* Tear down the scratch vcpu created by kvm_arm_create_scratch_host_vcpu.
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*/
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void kvm_arm_destroy_scratch_host_vcpu(int *fdarray);
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#define TYPE_ARM_HOST_CPU "host-" TYPE_ARM_CPU
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#define ARM_HOST_CPU_CLASS(klass) \
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OBJECT_CLASS_CHECK(ARMHostCPUClass, (klass), TYPE_ARM_HOST_CPU)
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#define ARM_HOST_CPU_GET_CLASS(obj) \
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OBJECT_GET_CLASS(ARMHostCPUClass, (obj), TYPE_ARM_HOST_CPU)
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typedef struct ARMHostCPUClass {
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/*< private >*/
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ARMCPUClass parent_class;
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/*< public >*/
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uint64_t features;
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uint32_t target;
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const char *dtb_compatible;
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} ARMHostCPUClass;
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/**
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* kvm_arm_get_host_cpu_features:
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* @ahcc: ARMHostCPUClass to fill in
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*
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* Probe the capabilities of the host kernel's preferred CPU and fill
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* in the ARMHostCPUClass struct accordingly.
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*/
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bool kvm_arm_get_host_cpu_features(ARMHostCPUClass *ahcc);
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/**
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* kvm_arm_sync_mpstate_to_kvm
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* @cpu: ARMCPU
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*
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* If supported set the KVM MP_STATE based on QEMU's model.
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*/
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int kvm_arm_sync_mpstate_to_kvm(ARMCPU *cpu);
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/**
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* kvm_arm_sync_mpstate_to_qemu
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* @cpu: ARMCPU
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*
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* If supported get the MP_STATE from KVM and store in QEMU's model.
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*/
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int kvm_arm_sync_mpstate_to_qemu(ARMCPU *cpu);
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#endif
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#endif
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