e76d05c2b5
Report from clang analyzer: clock.c:42:15: warning: Value stored to 'cpu' during its initialization is never read Signed-off-by: Stefan Weil <sw@weilnetz.de> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
146 lines
3.7 KiB
C
146 lines
3.7 KiB
C
/*
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* QEMU KVM support, paravirtual clock device
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*
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* Copyright (C) 2011 Siemens AG
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*
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* Authors:
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* Jan Kiszka <jan.kiszka@siemens.com>
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*
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* This work is licensed under the terms of the GNU GPL version 2.
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* See the COPYING file in the top-level directory.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include "qemu-common.h"
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#include "sysemu/sysemu.h"
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#include "sysemu/kvm.h"
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#include "hw/sysbus.h"
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#include "hw/kvm/clock.h"
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#include <linux/kvm.h>
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#include <linux/kvm_para.h>
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#define TYPE_KVM_CLOCK "kvmclock"
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#define KVM_CLOCK(obj) OBJECT_CHECK(KVMClockState, (obj), TYPE_KVM_CLOCK)
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typedef struct KVMClockState {
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/*< private >*/
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SysBusDevice busdev;
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/*< public >*/
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uint64_t clock;
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bool clock_valid;
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} KVMClockState;
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static void kvmclock_vm_state_change(void *opaque, int running,
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RunState state)
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{
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KVMClockState *s = opaque;
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CPUState *cpu;
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int cap_clock_ctrl = kvm_check_extension(kvm_state, KVM_CAP_KVMCLOCK_CTRL);
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int ret;
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if (running) {
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struct kvm_clock_data data;
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s->clock_valid = false;
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data.clock = s->clock;
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data.flags = 0;
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ret = kvm_vm_ioctl(kvm_state, KVM_SET_CLOCK, &data);
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if (ret < 0) {
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fprintf(stderr, "KVM_SET_CLOCK failed: %s\n", strerror(ret));
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abort();
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}
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if (!cap_clock_ctrl) {
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return;
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}
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CPU_FOREACH(cpu) {
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ret = kvm_vcpu_ioctl(cpu, KVM_KVMCLOCK_CTRL, 0);
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if (ret) {
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if (ret != -EINVAL) {
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fprintf(stderr, "%s: %s\n", __func__, strerror(-ret));
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}
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return;
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}
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}
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} else {
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struct kvm_clock_data data;
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int ret;
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if (s->clock_valid) {
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return;
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}
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ret = kvm_vm_ioctl(kvm_state, KVM_GET_CLOCK, &data);
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if (ret < 0) {
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fprintf(stderr, "KVM_GET_CLOCK failed: %s\n", strerror(ret));
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abort();
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}
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s->clock = data.clock;
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/*
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* If the VM is stopped, declare the clock state valid to
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* avoid re-reading it on next vmsave (which would return
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* a different value). Will be reset when the VM is continued.
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*/
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s->clock_valid = true;
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}
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}
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static void kvmclock_realize(DeviceState *dev, Error **errp)
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{
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KVMClockState *s = KVM_CLOCK(dev);
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qemu_add_vm_change_state_handler(kvmclock_vm_state_change, s);
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}
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static const VMStateDescription kvmclock_vmsd = {
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.name = "kvmclock",
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.version_id = 1,
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.minimum_version_id = 1,
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.minimum_version_id_old = 1,
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.fields = (VMStateField[]) {
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VMSTATE_UINT64(clock, KVMClockState),
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VMSTATE_END_OF_LIST()
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}
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};
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static void kvmclock_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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dc->realize = kvmclock_realize;
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dc->no_user = 1;
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dc->vmsd = &kvmclock_vmsd;
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}
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static const TypeInfo kvmclock_info = {
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.name = TYPE_KVM_CLOCK,
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.parent = TYPE_SYS_BUS_DEVICE,
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.instance_size = sizeof(KVMClockState),
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.class_init = kvmclock_class_init,
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};
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/* Note: Must be called after VCPU initialization. */
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void kvmclock_create(void)
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{
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X86CPU *cpu = X86_CPU(first_cpu);
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if (kvm_enabled() &&
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cpu->env.features[FEAT_KVM] & ((1ULL << KVM_FEATURE_CLOCKSOURCE) |
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(1ULL << KVM_FEATURE_CLOCKSOURCE2))) {
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sysbus_create_simple(TYPE_KVM_CLOCK, -1, NULL);
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}
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}
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static void kvmclock_register_types(void)
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{
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type_register_static(&kvmclock_info);
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}
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type_init(kvmclock_register_types)
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