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https://github.com/Motorhead1991/qemu.git
synced 2025-07-27 04:13:53 -06:00
13057e064a
Locking the memory without MCL_ONFAULT instantly prefaults any mmaped anonymous memory with a write-fault, which introduces a lot of extra overhead in terms of memory usage when all you want to do is to prevent kcompactd from migrating and compacting QEMU pages. Add an option to only lock pages lazily as they're faulted by the process by using MCL_ONFAULT if asked. Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> Reviewed-by: Peter Xu <peterx@redhat.com> Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru> Link: https://lore.kernel.org/r/20250212143920.1269754-5-d-tatianin@yandex-team.ru Signed-off-by: Peter Xu <peterx@redhat.com>
125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
#ifndef SYSTEM_H
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#define SYSTEM_H
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/* Misc. things related to the system emulator. */
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#include "qemu/timer.h"
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#include "qemu/notify.h"
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#include "qemu/uuid.h"
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/* vl.c */
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extern int only_migratable;
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extern const char *qemu_name;
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extern QemuUUID qemu_uuid;
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extern bool qemu_uuid_set;
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const char *qemu_get_vm_name(void);
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/* Exit notifiers will run with BQL held. */
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void qemu_add_exit_notifier(Notifier *notify);
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void qemu_remove_exit_notifier(Notifier *notify);
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void qemu_add_machine_init_done_notifier(Notifier *notify);
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void qemu_remove_machine_init_done_notifier(Notifier *notify);
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void configure_rtc(QemuOpts *opts);
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void qemu_init_subsystems(void);
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extern int autostart;
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typedef enum {
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VGA_NONE, VGA_STD, VGA_CIRRUS, VGA_VMWARE, VGA_XENFB, VGA_QXL,
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VGA_TCX, VGA_CG3, VGA_DEVICE, VGA_VIRTIO,
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VGA_TYPE_MAX,
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} VGAInterfaceType;
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extern int vga_interface_type;
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extern bool vga_interface_created;
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extern int graphic_width;
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extern int graphic_height;
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extern int graphic_depth;
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extern int display_opengl;
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extern const char *keyboard_layout;
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extern int old_param;
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extern uint8_t *boot_splash_filedata;
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extern bool enable_cpu_pm;
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extern QEMUClockType rtc_clock;
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typedef enum {
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MLOCK_OFF = 0,
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MLOCK_ON,
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MLOCK_ON_FAULT,
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} MlockState;
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bool should_mlock(MlockState);
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bool is_mlock_on_fault(MlockState);
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extern MlockState mlock_state;
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#define MAX_OPTION_ROMS 16
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typedef struct QEMUOptionRom {
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const char *name;
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int32_t bootindex;
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} QEMUOptionRom;
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extern QEMUOptionRom option_rom[MAX_OPTION_ROMS];
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extern int nb_option_roms;
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#define MAX_PROM_ENVS 128
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extern const char *prom_envs[MAX_PROM_ENVS];
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extern unsigned int nb_prom_envs;
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/* serial ports */
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/* Return the Chardev for serial port i, or NULL if none */
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Chardev *serial_hd(int i);
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/* parallel ports */
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#define MAX_PARALLEL_PORTS 3
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extern Chardev *parallel_hds[MAX_PARALLEL_PORTS];
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void add_boot_device_path(int32_t bootindex, DeviceState *dev,
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const char *suffix);
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char *get_boot_devices_list(size_t *size);
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DeviceState *get_boot_device(uint32_t position);
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void check_boot_index(int32_t bootindex, Error **errp);
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void del_boot_device_path(DeviceState *dev, const char *suffix);
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void device_add_bootindex_property(Object *obj, int32_t *bootindex,
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const char *name, const char *suffix,
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DeviceState *dev);
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void restore_boot_order(void *opaque);
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void validate_bootdevices(const char *devices, Error **errp);
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void add_boot_device_lchs(DeviceState *dev, const char *suffix,
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uint32_t lcyls, uint32_t lheads, uint32_t lsecs);
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void del_boot_device_lchs(DeviceState *dev, const char *suffix);
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char *get_boot_devices_lchs_list(size_t *size);
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/* handler to set the boot_device order for a specific type of MachineClass */
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typedef void QEMUBootSetHandler(void *opaque, const char *boot_order,
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Error **errp);
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void qemu_register_boot_set(QEMUBootSetHandler *func, void *opaque);
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void qemu_boot_set(const char *boot_order, Error **errp);
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bool defaults_enabled(void);
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void qemu_init(int argc, char **argv);
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int qemu_main_loop(void);
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void qemu_cleanup(int);
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extern QemuOptsList qemu_legacy_drive_opts;
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extern QemuOptsList qemu_common_drive_opts;
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extern QemuOptsList qemu_drive_opts;
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extern QemuOptsList bdrv_runtime_opts;
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extern QemuOptsList qemu_chardev_opts;
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extern QemuOptsList qemu_device_opts;
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extern QemuOptsList qemu_netdev_opts;
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extern QemuOptsList qemu_nic_opts;
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extern QemuOptsList qemu_net_opts;
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extern QemuOptsList qemu_global_opts;
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extern QemuOptsList qemu_semihosting_config_opts;
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#endif
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