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26861c7ce0
Add the bare minimum set of functions needed for control of an AArch64 KVM vcpu: * CPU initialization * minimal get/put register functions which only handle the basic state of the CPU Signed-off-by: Mian M. Hamayun <m.hamayun@virtualopensystems.com> Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 1385645602-18662-4-git-send-email-peter.maydell@linaro.org [PMM: significantly overhauled; most notably: * code lives in kvm64.c rather than using #ifdefs * support '-cpu host' rather than implicitly using whatever the host's CPU is regardless of what the user requests * fix bug attempting to get/set nonexistent X[31] * fix bug writing 64 bit kernel pstate into uint32_t env field ] Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
392 lines
9.4 KiB
C
392 lines
9.4 KiB
C
/*
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* ARM implementation of KVM hooks
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*
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* Copyright Christoffer Dall 2009-2010
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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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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <linux/kvm.h>
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#include "qemu-common.h"
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#include "qemu/timer.h"
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#include "sysemu/sysemu.h"
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#include "sysemu/kvm.h"
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#include "kvm_arm.h"
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#include "cpu.h"
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#include "hw/arm/arm.h"
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const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
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KVM_CAP_LAST_INFO
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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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int ret, kvmfd = -1, vmfd = -1, cpufd = -1;
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kvmfd = qemu_open("/dev/kvm", O_RDWR);
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if (kvmfd < 0) {
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goto err;
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}
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vmfd = ioctl(kvmfd, KVM_CREATE_VM, 0);
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if (vmfd < 0) {
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goto err;
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}
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cpufd = ioctl(vmfd, KVM_CREATE_VCPU, 0);
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if (cpufd < 0) {
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goto err;
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}
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ret = ioctl(vmfd, KVM_ARM_PREFERRED_TARGET, init);
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if (ret >= 0) {
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ret = ioctl(cpufd, KVM_ARM_VCPU_INIT, init);
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if (ret < 0) {
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goto err;
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}
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} else {
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/* Old kernel which doesn't know about the
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* PREFERRED_TARGET ioctl: we know it will only support
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* creating one kind of guest CPU which is its preferred
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* CPU type.
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*/
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while (*cpus_to_try != QEMU_KVM_ARM_TARGET_NONE) {
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init->target = *cpus_to_try++;
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memset(init->features, 0, sizeof(init->features));
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ret = ioctl(cpufd, KVM_ARM_VCPU_INIT, init);
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if (ret >= 0) {
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break;
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}
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}
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if (ret < 0) {
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goto err;
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}
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}
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fdarray[0] = kvmfd;
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fdarray[1] = vmfd;
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fdarray[2] = cpufd;
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return true;
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err:
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if (cpufd >= 0) {
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close(cpufd);
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}
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if (vmfd >= 0) {
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close(vmfd);
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}
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if (kvmfd >= 0) {
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close(kvmfd);
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}
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return false;
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}
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void kvm_arm_destroy_scratch_host_vcpu(int *fdarray)
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{
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int i;
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for (i = 2; i >= 0; i--) {
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close(fdarray[i]);
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}
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}
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static void kvm_arm_host_cpu_class_init(ObjectClass *oc, void *data)
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{
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ARMHostCPUClass *ahcc = ARM_HOST_CPU_CLASS(oc);
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/* All we really need to set up for the 'host' CPU
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* is the feature bits -- we rely on the fact that the
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* various ID register values in ARMCPU are only used for
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* TCG CPUs.
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*/
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if (!kvm_arm_get_host_cpu_features(ahcc)) {
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fprintf(stderr, "Failed to retrieve host CPU features!\n");
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abort();
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}
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}
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static void kvm_arm_host_cpu_initfn(Object *obj)
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{
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ARMHostCPUClass *ahcc = ARM_HOST_CPU_GET_CLASS(obj);
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ARMCPU *cpu = ARM_CPU(obj);
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CPUARMState *env = &cpu->env;
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cpu->kvm_target = ahcc->target;
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cpu->dtb_compatible = ahcc->dtb_compatible;
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env->features = ahcc->features;
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}
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static const TypeInfo host_arm_cpu_type_info = {
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.name = TYPE_ARM_HOST_CPU,
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#ifdef TARGET_AARCH64
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.parent = TYPE_AARCH64_CPU,
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#else
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.parent = TYPE_ARM_CPU,
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#endif
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.instance_init = kvm_arm_host_cpu_initfn,
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.class_init = kvm_arm_host_cpu_class_init,
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.class_size = sizeof(ARMHostCPUClass),
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};
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int kvm_arch_init(KVMState *s)
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{
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/* For ARM interrupt delivery is always asynchronous,
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* whether we are using an in-kernel VGIC or not.
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*/
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kvm_async_interrupts_allowed = true;
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type_register_static(&host_arm_cpu_type_info);
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return 0;
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}
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unsigned long kvm_arch_vcpu_id(CPUState *cpu)
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{
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return cpu->cpu_index;
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}
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/* We track all the KVM devices which need their memory addresses
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* passing to the kernel in a list of these structures.
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* When board init is complete we run through the list and
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* tell the kernel the base addresses of the memory regions.
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* We use a MemoryListener to track mapping and unmapping of
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* the regions during board creation, so the board models don't
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* need to do anything special for the KVM case.
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*/
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typedef struct KVMDevice {
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struct kvm_arm_device_addr kda;
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MemoryRegion *mr;
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QSLIST_ENTRY(KVMDevice) entries;
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} KVMDevice;
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static QSLIST_HEAD(kvm_devices_head, KVMDevice) kvm_devices_head;
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static void kvm_arm_devlistener_add(MemoryListener *listener,
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MemoryRegionSection *section)
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{
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KVMDevice *kd;
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QSLIST_FOREACH(kd, &kvm_devices_head, entries) {
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if (section->mr == kd->mr) {
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kd->kda.addr = section->offset_within_address_space;
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}
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}
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}
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static void kvm_arm_devlistener_del(MemoryListener *listener,
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MemoryRegionSection *section)
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{
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KVMDevice *kd;
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QSLIST_FOREACH(kd, &kvm_devices_head, entries) {
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if (section->mr == kd->mr) {
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kd->kda.addr = -1;
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}
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}
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}
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static MemoryListener devlistener = {
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.region_add = kvm_arm_devlistener_add,
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.region_del = kvm_arm_devlistener_del,
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};
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static void kvm_arm_machine_init_done(Notifier *notifier, void *data)
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{
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KVMDevice *kd, *tkd;
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memory_listener_unregister(&devlistener);
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QSLIST_FOREACH_SAFE(kd, &kvm_devices_head, entries, tkd) {
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if (kd->kda.addr != -1) {
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if (kvm_vm_ioctl(kvm_state, KVM_ARM_SET_DEVICE_ADDR,
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&kd->kda) < 0) {
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fprintf(stderr, "KVM_ARM_SET_DEVICE_ADDRESS failed: %s\n",
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strerror(errno));
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abort();
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}
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}
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memory_region_unref(kd->mr);
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g_free(kd);
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}
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}
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static Notifier notify = {
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.notify = kvm_arm_machine_init_done,
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};
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void kvm_arm_register_device(MemoryRegion *mr, uint64_t devid)
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{
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KVMDevice *kd;
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if (!kvm_irqchip_in_kernel()) {
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return;
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}
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if (QSLIST_EMPTY(&kvm_devices_head)) {
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memory_listener_register(&devlistener, NULL);
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qemu_add_machine_init_done_notifier(¬ify);
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}
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kd = g_new0(KVMDevice, 1);
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kd->mr = mr;
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kd->kda.id = devid;
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kd->kda.addr = -1;
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QSLIST_INSERT_HEAD(&kvm_devices_head, kd, entries);
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memory_region_ref(kd->mr);
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}
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bool write_kvmstate_to_list(ARMCPU *cpu)
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{
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CPUState *cs = CPU(cpu);
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int i;
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bool ok = true;
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for (i = 0; i < cpu->cpreg_array_len; i++) {
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struct kvm_one_reg r;
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uint64_t regidx = cpu->cpreg_indexes[i];
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uint32_t v32;
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int ret;
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r.id = regidx;
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switch (regidx & KVM_REG_SIZE_MASK) {
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case KVM_REG_SIZE_U32:
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r.addr = (uintptr_t)&v32;
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ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r);
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if (!ret) {
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cpu->cpreg_values[i] = v32;
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}
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break;
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case KVM_REG_SIZE_U64:
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r.addr = (uintptr_t)(cpu->cpreg_values + i);
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ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r);
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break;
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default:
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abort();
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}
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if (ret) {
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ok = false;
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}
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}
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return ok;
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}
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bool write_list_to_kvmstate(ARMCPU *cpu)
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{
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CPUState *cs = CPU(cpu);
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int i;
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bool ok = true;
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for (i = 0; i < cpu->cpreg_array_len; i++) {
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struct kvm_one_reg r;
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uint64_t regidx = cpu->cpreg_indexes[i];
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uint32_t v32;
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int ret;
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r.id = regidx;
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switch (regidx & KVM_REG_SIZE_MASK) {
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case KVM_REG_SIZE_U32:
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v32 = cpu->cpreg_values[i];
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r.addr = (uintptr_t)&v32;
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break;
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case KVM_REG_SIZE_U64:
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r.addr = (uintptr_t)(cpu->cpreg_values + i);
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break;
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default:
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abort();
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}
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ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &r);
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if (ret) {
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/* We might fail for "unknown register" and also for
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* "you tried to set a register which is constant with
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* a different value from what it actually contains".
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*/
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ok = false;
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}
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}
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return ok;
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}
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void kvm_arch_pre_run(CPUState *cs, struct kvm_run *run)
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{
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}
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void kvm_arch_post_run(CPUState *cs, struct kvm_run *run)
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{
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}
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int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
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{
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return 0;
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}
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bool kvm_arch_stop_on_emulation_error(CPUState *cs)
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{
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return true;
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}
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int kvm_arch_process_async_events(CPUState *cs)
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{
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return 0;
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}
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int kvm_arch_on_sigbus_vcpu(CPUState *cs, int code, void *addr)
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{
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return 1;
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}
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int kvm_arch_on_sigbus(int code, void *addr)
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{
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return 1;
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}
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void kvm_arch_update_guest_debug(CPUState *cs, struct kvm_guest_debug *dbg)
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{
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qemu_log_mask(LOG_UNIMP, "%s: not implemented\n", __func__);
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}
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int kvm_arch_insert_sw_breakpoint(CPUState *cs,
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struct kvm_sw_breakpoint *bp)
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{
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qemu_log_mask(LOG_UNIMP, "%s: not implemented\n", __func__);
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return -EINVAL;
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}
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int kvm_arch_insert_hw_breakpoint(target_ulong addr,
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target_ulong len, int type)
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{
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qemu_log_mask(LOG_UNIMP, "%s: not implemented\n", __func__);
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return -EINVAL;
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}
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int kvm_arch_remove_hw_breakpoint(target_ulong addr,
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target_ulong len, int type)
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{
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qemu_log_mask(LOG_UNIMP, "%s: not implemented\n", __func__);
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return -EINVAL;
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}
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int kvm_arch_remove_sw_breakpoint(CPUState *cs,
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struct kvm_sw_breakpoint *bp)
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{
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qemu_log_mask(LOG_UNIMP, "%s: not implemented\n", __func__);
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return -EINVAL;
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}
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void kvm_arch_remove_all_hw_breakpoints(void)
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{
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qemu_log_mask(LOG_UNIMP, "%s: not implemented\n", __func__);
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}
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void kvm_arch_init_irq_routing(KVMState *s)
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{
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}
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