diff options
Diffstat (limited to 'qemu/hw/i386/kvm/clock.c')
| -rw-r--r-- | qemu/hw/i386/kvm/clock.c | 196 |
1 files changed, 0 insertions, 196 deletions
diff --git a/qemu/hw/i386/kvm/clock.c b/qemu/hw/i386/kvm/clock.c deleted file mode 100644 index a3b300cad..000000000 --- a/qemu/hw/i386/kvm/clock.c +++ /dev/null @@ -1,196 +0,0 @@ -/* - * QEMU KVM support, paravirtual clock device - * - * Copyright (C) 2011 Siemens AG - * - * Authors: - * Jan Kiszka <jan.kiszka@siemens.com> - * - * This work is licensed under the terms of the GNU GPL version 2. - * See the COPYING file in the top-level directory. - * - * Contributions after 2012-01-13 are licensed under the terms of the - * GNU GPL, version 2 or (at your option) any later version. - */ - -#include "qemu/osdep.h" -#include "qemu-common.h" -#include "qemu/host-utils.h" -#include "sysemu/sysemu.h" -#include "sysemu/kvm.h" -#include "kvm_i386.h" -#include "hw/sysbus.h" -#include "hw/kvm/clock.h" - -#include <linux/kvm.h> -#include <linux/kvm_para.h> - -#define TYPE_KVM_CLOCK "kvmclock" -#define KVM_CLOCK(obj) OBJECT_CHECK(KVMClockState, (obj), TYPE_KVM_CLOCK) - -typedef struct KVMClockState { - /*< private >*/ - SysBusDevice busdev; - /*< public >*/ - - uint64_t clock; - bool clock_valid; -} KVMClockState; - -struct pvclock_vcpu_time_info { - uint32_t version; - uint32_t pad0; - uint64_t tsc_timestamp; - uint64_t system_time; - uint32_t tsc_to_system_mul; - int8_t tsc_shift; - uint8_t flags; - uint8_t pad[2]; -} __attribute__((__packed__)); /* 32 bytes */ - -static uint64_t kvmclock_current_nsec(KVMClockState *s) -{ - CPUState *cpu = first_cpu; - CPUX86State *env = cpu->env_ptr; - hwaddr kvmclock_struct_pa = env->system_time_msr & ~1ULL; - uint64_t migration_tsc = env->tsc; - struct pvclock_vcpu_time_info time; - uint64_t delta; - uint64_t nsec_lo; - uint64_t nsec_hi; - uint64_t nsec; - - if (!(env->system_time_msr & 1ULL)) { - /* KVM clock not active */ - return 0; - } - - cpu_physical_memory_read(kvmclock_struct_pa, &time, sizeof(time)); - - assert(time.tsc_timestamp <= migration_tsc); - delta = migration_tsc - time.tsc_timestamp; - if (time.tsc_shift < 0) { - delta >>= -time.tsc_shift; - } else { - delta <<= time.tsc_shift; - } - - mulu64(&nsec_lo, &nsec_hi, delta, time.tsc_to_system_mul); - nsec = (nsec_lo >> 32) | (nsec_hi << 32); - return nsec + time.system_time; -} - -static void kvmclock_vm_state_change(void *opaque, int running, - RunState state) -{ - KVMClockState *s = opaque; - CPUState *cpu; - int cap_clock_ctrl = kvm_check_extension(kvm_state, KVM_CAP_KVMCLOCK_CTRL); - int ret; - - if (running) { - struct kvm_clock_data data = {}; - uint64_t time_at_migration = kvmclock_current_nsec(s); - - s->clock_valid = false; - - /* We can't rely on the migrated clock value, just discard it */ - if (time_at_migration) { - s->clock = time_at_migration; - } - - data.clock = s->clock; - ret = kvm_vm_ioctl(kvm_state, KVM_SET_CLOCK, &data); - if (ret < 0) { - fprintf(stderr, "KVM_SET_CLOCK failed: %s\n", strerror(ret)); - abort(); - } - - if (!cap_clock_ctrl) { - return; - } - CPU_FOREACH(cpu) { - ret = kvm_vcpu_ioctl(cpu, KVM_KVMCLOCK_CTRL, 0); - if (ret) { - if (ret != -EINVAL) { - fprintf(stderr, "%s: %s\n", __func__, strerror(-ret)); - } - return; - } - } - } else { - struct kvm_clock_data data; - int ret; - - if (s->clock_valid) { - return; - } - - kvm_synchronize_all_tsc(); - - ret = kvm_vm_ioctl(kvm_state, KVM_GET_CLOCK, &data); - if (ret < 0) { - fprintf(stderr, "KVM_GET_CLOCK failed: %s\n", strerror(ret)); - abort(); - } - s->clock = data.clock; - - /* - * If the VM is stopped, declare the clock state valid to - * avoid re-reading it on next vmsave (which would return - * a different value). Will be reset when the VM is continued. - */ - s->clock_valid = true; - } -} - -static void kvmclock_realize(DeviceState *dev, Error **errp) -{ - KVMClockState *s = KVM_CLOCK(dev); - - qemu_add_vm_change_state_handler(kvmclock_vm_state_change, s); -} - -static const VMStateDescription kvmclock_vmsd = { - .name = "kvmclock", - .version_id = 1, - .minimum_version_id = 1, - .fields = (VMStateField[]) { - VMSTATE_UINT64(clock, KVMClockState), - VMSTATE_END_OF_LIST() - } -}; - -static void kvmclock_class_init(ObjectClass *klass, void *data) -{ - DeviceClass *dc = DEVICE_CLASS(klass); - - dc->realize = kvmclock_realize; - dc->vmsd = &kvmclock_vmsd; -} - -static const TypeInfo kvmclock_info = { - .name = TYPE_KVM_CLOCK, - .parent = TYPE_SYS_BUS_DEVICE, - .instance_size = sizeof(KVMClockState), - .class_init = kvmclock_class_init, -}; - -/* Note: Must be called after VCPU initialization. */ -void kvmclock_create(void) -{ - X86CPU *cpu = X86_CPU(first_cpu); - - if (kvm_enabled() && - cpu->env.features[FEAT_KVM] & ((1ULL << KVM_FEATURE_CLOCKSOURCE) | - (1ULL << KVM_FEATURE_CLOCKSOURCE2))) { - sysbus_create_simple(TYPE_KVM_CLOCK, -1, NULL); - } -} - -static void kvmclock_register_types(void) -{ - type_register_static(&kvmclock_info); -} - -type_init(kvmclock_register_types) |