diff options
author | Anthony Liguori <aliguori@us.ibm.com> | 2011-02-16 08:47:07 -0600 |
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committer | Anthony Liguori <aliguori@us.ibm.com> | 2011-02-16 08:47:07 -0600 |
commit | c5d69e6bbf37bf5e3882060764b15e018e6a5321 (patch) | |
tree | e246e96bdfffbc5e07682c5a39ea7a65482a5935 /hw/kvmclock.c | |
parent | 630ecca0da959e65acad1ee0bf3a631bbb7ee052 (diff) | |
parent | 0ec329dab938e2d97d12a91f8ed15fec27b325e0 (diff) |
Merge remote branch 'qemu-kvm/uq/master' into staging
Diffstat (limited to 'hw/kvmclock.c')
-rw-r--r-- | hw/kvmclock.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/hw/kvmclock.c b/hw/kvmclock.c new file mode 100644 index 0000000000..b6ceddfba6 --- /dev/null +++ b/hw/kvmclock.c @@ -0,0 +1,125 @@ +/* + * 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. + * + */ + +#include "qemu-common.h" +#include "sysemu.h" +#include "sysbus.h" +#include "kvm.h" +#include "kvmclock.h" + +#if defined(CONFIG_KVM_PARA) && defined(KVM_CAP_ADJUST_CLOCK) + +#include <linux/kvm.h> +#include <linux/kvm_para.h> + +typedef struct KVMClockState { + SysBusDevice busdev; + uint64_t clock; + bool clock_valid; +} KVMClockState; + +static void kvmclock_pre_save(void *opaque) +{ + KVMClockState *s = opaque; + struct kvm_clock_data data; + int ret; + + if (s->clock_valid) { + return; + } + ret = kvm_vm_ioctl(kvm_state, KVM_GET_CLOCK, &data); + if (ret < 0) { + fprintf(stderr, "KVM_GET_CLOCK failed: %s\n", strerror(ret)); + data.clock = 0; + } + 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 = !vm_running; +} + +static int kvmclock_post_load(void *opaque, int version_id) +{ + KVMClockState *s = opaque; + struct kvm_clock_data data; + + data.clock = s->clock; + data.flags = 0; + return kvm_vm_ioctl(kvm_state, KVM_SET_CLOCK, &data); +} + +static void kvmclock_vm_state_change(void *opaque, int running, int reason) +{ + KVMClockState *s = opaque; + + if (running) { + s->clock_valid = false; + } +} + +static int kvmclock_init(SysBusDevice *dev) +{ + KVMClockState *s = FROM_SYSBUS(KVMClockState, dev); + + qemu_add_vm_change_state_handler(kvmclock_vm_state_change, s); + return 0; +} + +static const VMStateDescription kvmclock_vmsd = { + .name = "kvmclock", + .version_id = 1, + .minimum_version_id = 1, + .minimum_version_id_old = 1, + .pre_save = kvmclock_pre_save, + .post_load = kvmclock_post_load, + .fields = (VMStateField[]) { + VMSTATE_UINT64(clock, KVMClockState), + VMSTATE_END_OF_LIST() + } +}; + +static SysBusDeviceInfo kvmclock_info = { + .qdev.name = "kvmclock", + .qdev.size = sizeof(KVMClockState), + .qdev.vmsd = &kvmclock_vmsd, + .qdev.no_user = 1, + .init = kvmclock_init, +}; + +/* Note: Must be called after VCPU initialization. */ +void kvmclock_create(void) +{ + if (kvm_enabled() && + first_cpu->cpuid_kvm_features & (1ULL << KVM_FEATURE_CLOCKSOURCE)) { + sysbus_create_simple("kvmclock", -1, NULL); + } +} + +static void kvmclock_register_device(void) +{ + if (kvm_enabled()) { + sysbus_register_withprop(&kvmclock_info); + } +} + +device_init(kvmclock_register_device); + +#else /* !(CONFIG_KVM_PARA && KVM_CAP_ADJUST_CLOCK) */ + +void kvmclock_create(void) +{ +} +#endif /* !(CONFIG_KVM_PARA && KVM_CAP_ADJUST_CLOCK) */ |