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author | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2012-01-25 12:24:51 +0000 |
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committer | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2012-03-19 18:21:00 +0000 |
commit | a7ae8355b4465bb52021451a77615f83872970b0 (patch) | |
tree | 64938ef20cc12726b5d229621c43ebe6cf40e462 /savevm.c | |
parent | 695bb854e88be20756d5e509e02e28f94528b776 (diff) | |
download | hqemu-a7ae8355b4465bb52021451a77615f83872970b0.zip hqemu-a7ae8355b4465bb52021451a77615f83872970b0.tar.gz |
Introduce "xen-save-devices-state"
- add an "is_ram" flag to SaveStateEntry;
- register_savevm_live sets is_ram for live_savevm devices;
- introduce a "xen-save-devices-state" QAPI command that can be used to save
the state of all devices, but not the RAM or the block devices of the
VM.
Changes in v8:
- rename save-devices-state to xen-save-devices-state.
Changes in v7:
- rename save_devices to save-devices-state.
Changes in v6:
- remove the is_ram parameter from register_savevm_live and sets is_ram
if the device is a live_savevm device;
- introduce save_devices as a QAPI command, write a better description
for it;
- fix CODING_STYLE;
- introduce a new doc to explain the save format used by save_devices.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
Acked-by: Luiz Capitulino <lcapitulino@redhat.com>
Diffstat (limited to 'savevm.c')
-rw-r--r-- | savevm.c | 71 |
1 files changed, 71 insertions, 0 deletions
@@ -84,6 +84,7 @@ #include "qemu-timer.h" #include "cpus.h" #include "memory.h" +#include "qmp-commands.h" #define SELF_ANNOUNCE_ROUNDS 5 @@ -1177,6 +1178,7 @@ typedef struct SaveStateEntry { void *opaque; CompatEntry *compat; int no_migrate; + int is_ram; } SaveStateEntry; @@ -1241,6 +1243,10 @@ int register_savevm_live(DeviceState *dev, se->opaque = opaque; se->vmsd = NULL; se->no_migrate = 0; + /* if this is a live_savem then set is_ram */ + if (save_live_state != NULL) { + se->is_ram = 1; + } if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) { char *id = dev->parent_bus->info->get_dev_path(dev); @@ -1728,6 +1734,45 @@ out: return ret; } +static int qemu_save_device_state(QEMUFile *f) +{ + SaveStateEntry *se; + + qemu_put_be32(f, QEMU_VM_FILE_MAGIC); + qemu_put_be32(f, QEMU_VM_FILE_VERSION); + + cpu_synchronize_all_states(); + + QTAILQ_FOREACH(se, &savevm_handlers, entry) { + int len; + + if (se->is_ram) { + continue; + } + if (se->save_state == NULL && se->vmsd == NULL) { + continue; + } + + /* Section type */ + qemu_put_byte(f, QEMU_VM_SECTION_FULL); + qemu_put_be32(f, se->section_id); + + /* ID string */ + len = strlen(se->idstr); + qemu_put_byte(f, len); + qemu_put_buffer(f, (uint8_t *)se->idstr, len); + + qemu_put_be32(f, se->instance_id); + qemu_put_be32(f, se->version_id); + + vmstate_save(f, se); + } + + qemu_put_byte(f, QEMU_VM_EOF); + + return qemu_file_get_error(f); +} + static SaveStateEntry *find_se(const char *idstr, int instance_id) { SaveStateEntry *se; @@ -2109,6 +2154,32 @@ void do_savevm(Monitor *mon, const QDict *qdict) vm_start(); } +void qmp_xen_save_devices_state(const char *filename, Error **errp) +{ + QEMUFile *f; + int saved_vm_running; + int ret; + + saved_vm_running = runstate_is_running(); + vm_stop(RUN_STATE_SAVE_VM); + + f = qemu_fopen(filename, "wb"); + if (!f) { + error_set(errp, QERR_OPEN_FILE_FAILED, filename); + goto the_end; + } + ret = qemu_save_device_state(f); + qemu_fclose(f); + if (ret < 0) { + error_set(errp, QERR_IO_ERROR); + } + + the_end: + if (saved_vm_running) + vm_start(); + return; +} + int load_vmstate(const char *name) { BlockDriverState *bs, *bs_vm_state; |