f349c12c04
Often when a guest is stopped from the qemu console, it will report spurious soft lockup warnings on resume. There are kernel patches being discussed that will give the host the ability to tell the guest that it is being stopped and should ignore the soft lockup warning that generates. This patch uses the qemu Notifier system to tell the guest it is about to be stopped. Signed-off-by: Eric B Munson <emunson@mgebm.net> Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Reviewed-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
144 lines
3.6 KiB
C
144 lines
3.6 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.h"
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#include "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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typedef struct KVMClockState {
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SysBusDevice busdev;
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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_pre_save(void *opaque)
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{
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KVMClockState *s = opaque;
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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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data.clock = 0;
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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 avoid re-reading
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* it on next vmsave (which would return a different value). Will be reset
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* when the VM is continued.
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*/
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s->clock_valid = !runstate_is_running();
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}
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static int kvmclock_post_load(void *opaque, int version_id)
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{
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KVMClockState *s = opaque;
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struct kvm_clock_data data;
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data.clock = s->clock;
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data.flags = 0;
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return kvm_vm_ioctl(kvm_state, KVM_SET_CLOCK, &data);
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}
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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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CPUArchState *penv = first_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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s->clock_valid = false;
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if (!cap_clock_ctrl) {
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return;
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}
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for (penv = first_cpu; penv != NULL; penv = penv->next_cpu) {
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ret = kvm_vcpu_ioctl(penv, 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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}
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}
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static int kvmclock_init(SysBusDevice *dev)
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{
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KVMClockState *s = FROM_SYSBUS(KVMClockState, dev);
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qemu_add_vm_change_state_handler(kvmclock_vm_state_change, s);
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return 0;
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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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.pre_save = kvmclock_pre_save,
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.post_load = kvmclock_post_load,
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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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SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
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k->init = kvmclock_init;
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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 TypeInfo kvmclock_info = {
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.name = "kvmclock",
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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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if (kvm_enabled() &&
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first_cpu->cpuid_kvm_features & ((1ULL << KVM_FEATURE_CLOCKSOURCE) |
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(1ULL << KVM_FEATURE_CLOCKSOURCE2))) {
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sysbus_create_simple("kvmclock", -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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