diff options
Diffstat (limited to 'include/hw')
| -rw-r--r-- | include/hw/boards.h | 14 | ||||
| -rw-r--r-- | include/hw/mem/memory-device.h | 57 | ||||
| -rw-r--r-- | include/hw/virtio/vhost-backend.h | 9 | ||||
| -rw-r--r-- | include/hw/virtio/vhost.h | 3 | ||||
| -rw-r--r-- | include/hw/virtio/virtio-mem.h | 32 |
5 files changed, 105 insertions, 10 deletions
diff --git a/include/hw/boards.h b/include/hw/boards.h index 55a64a1..43a56dc 100644 --- a/include/hw/boards.h +++ b/include/hw/boards.h @@ -297,15 +297,27 @@ struct MachineClass { * DeviceMemoryState: * @base: address in guest physical address space where the memory * address space for memory devices starts - * @mr: address space container for memory devices + * @mr: memory region container for memory devices + * @as: address space for memory devices + * @listener: memory listener used to track used memslots in the address space * @dimm_size: the sum of plugged DIMMs' sizes * @used_region_size: the part of @mr already used by memory devices + * @required_memslots: the number of memslots required by memory devices + * @used_memslots: the number of memslots currently used by memory devices + * @memslot_auto_decision_active: whether any plugged memory device + * automatically decided to use more than + * one memslot */ typedef struct DeviceMemoryState { hwaddr base; MemoryRegion mr; + AddressSpace as; + MemoryListener listener; uint64_t dimm_size; uint64_t used_region_size; + unsigned int required_memslots; + unsigned int used_memslots; + unsigned int memslot_auto_decision_active; } DeviceMemoryState; /** diff --git a/include/hw/mem/memory-device.h b/include/hw/mem/memory-device.h index 48d2611..3354d6c 100644 --- a/include/hw/mem/memory-device.h +++ b/include/hw/mem/memory-device.h @@ -14,6 +14,7 @@ #define MEMORY_DEVICE_H #include "hw/qdev-core.h" +#include "qemu/typedefs.h" #include "qapi/qapi-types-machine.h" #include "qom/object.h" @@ -41,6 +42,17 @@ typedef struct MemoryDeviceState MemoryDeviceState; * successive memory regions are used, a covering memory region has to * be provided. Scattered memory regions are not supported for single * devices. + * + * The device memory region returned via @get_memory_region may either be a + * single RAM memory region or a memory region container with subregions + * that are RAM memory regions or aliases to RAM memory regions. Other + * memory regions or subregions are not supported. + * + * If the device memory region returned via @get_memory_region is a + * memory region container, it's supported to dynamically (un)map subregions + * as long as the number of memslots returned by @get_memslots() won't + * be exceeded and as long as all memory regions are of the same kind (e.g., + * all RAM or all ROM). */ struct MemoryDeviceClass { /* private */ @@ -89,6 +101,28 @@ struct MemoryDeviceClass { MemoryRegion *(*get_memory_region)(MemoryDeviceState *md, Error **errp); /* + * Optional: Instruct the memory device to decide how many memory slots + * it requires, not exceeding the given limit. + * + * Called exactly once when pre-plugging the memory device, before + * querying the number of memslots using @get_memslots the first time. + */ + void (*decide_memslots)(MemoryDeviceState *md, unsigned int limit); + + /* + * Optional for memory devices that require only a single memslot, + * required for all other memory devices: Return the number of memslots + * (distinct RAM memory regions in the device memory region) that are + * required by the device. + * + * If this function is not implemented, the assumption is "1". + * + * Called when (un)plugging the memory device, to check if the requirements + * can be satisfied, and to do proper accounting. + */ + unsigned int (*get_memslots)(MemoryDeviceState *md); + + /* * Optional: Return the desired minimum alignment of the device in guest * physical address space. The final alignment is computed based on this * alignment and the alignment requirements of the memory region. @@ -105,8 +139,31 @@ struct MemoryDeviceClass { MemoryDeviceInfo *info); }; +/* + * Traditionally, KVM/vhost in many setups supported 509 memslots, whereby + * 253 memslots were "reserved" for boot memory and other devices (such + * as PCI BARs, which can get mapped dynamically) and 256 memslots were + * dedicated for DIMMs. These magic numbers worked reliably in the past. + * + * Further, using many memslots can negatively affect performance, so setting + * the soft-limit of memslots used by memory devices to the traditional + * DIMM limit of 256 sounds reasonable. + * + * If we have less than 509 memslots, we will instruct memory devices that + * support automatically deciding how many memslots to use to only use a single + * one. + * + * Hotplugging vhost devices with at least 509 memslots is not expected to + * cause problems, not even when devices automatically decided how many memslots + * to use. + */ +#define MEMORY_DEVICES_SOFT_MEMSLOT_LIMIT 256 +#define MEMORY_DEVICES_SAFE_MAX_MEMSLOTS 509 + MemoryDeviceInfoList *qmp_memory_device_list(void); uint64_t get_plugged_memory_size(void); +unsigned int memory_devices_get_reserved_memslots(void); +bool memory_devices_memslot_auto_decision_active(void); void memory_device_pre_plug(MemoryDeviceState *md, MachineState *ms, const uint64_t *legacy_align, Error **errp); void memory_device_plug(MemoryDeviceState *md, MachineState *ms); diff --git a/include/hw/virtio/vhost-backend.h b/include/hw/virtio/vhost-backend.h index 1860b54..96ccc18 100644 --- a/include/hw/virtio/vhost-backend.h +++ b/include/hw/virtio/vhost-backend.h @@ -86,9 +86,6 @@ typedef int (*vhost_set_vring_enable_op)(struct vhost_dev *dev, typedef bool (*vhost_requires_shm_log_op)(struct vhost_dev *dev); typedef int (*vhost_migration_done_op)(struct vhost_dev *dev, char *mac_addr); -typedef bool (*vhost_backend_can_merge_op)(struct vhost_dev *dev, - uint64_t start1, uint64_t size1, - uint64_t start2, uint64_t size2); typedef int (*vhost_vsock_set_guest_cid_op)(struct vhost_dev *dev, uint64_t guest_cid); typedef int (*vhost_vsock_set_running_op)(struct vhost_dev *dev, int start); @@ -108,8 +105,7 @@ typedef int (*vhost_crypto_create_session_op)(struct vhost_dev *dev, typedef int (*vhost_crypto_close_session_op)(struct vhost_dev *dev, uint64_t session_id); -typedef bool (*vhost_backend_mem_section_filter_op)(struct vhost_dev *dev, - MemoryRegionSection *section); +typedef bool (*vhost_backend_no_private_memslots_op)(struct vhost_dev *dev); typedef int (*vhost_get_inflight_fd_op)(struct vhost_dev *dev, uint16_t queue_size, @@ -138,6 +134,7 @@ typedef struct VhostOps { vhost_backend_init vhost_backend_init; vhost_backend_cleanup vhost_backend_cleanup; vhost_backend_memslots_limit vhost_backend_memslots_limit; + vhost_backend_no_private_memslots_op vhost_backend_no_private_memslots; vhost_net_set_backend_op vhost_net_set_backend; vhost_net_set_mtu_op vhost_net_set_mtu; vhost_scsi_set_endpoint_op vhost_scsi_set_endpoint; @@ -163,7 +160,6 @@ typedef struct VhostOps { vhost_set_vring_enable_op vhost_set_vring_enable; vhost_requires_shm_log_op vhost_requires_shm_log; vhost_migration_done_op vhost_migration_done; - vhost_backend_can_merge_op vhost_backend_can_merge; vhost_vsock_set_guest_cid_op vhost_vsock_set_guest_cid; vhost_vsock_set_running_op vhost_vsock_set_running; vhost_set_iotlb_callback_op vhost_set_iotlb_callback; @@ -172,7 +168,6 @@ typedef struct VhostOps { vhost_set_config_op vhost_set_config; vhost_crypto_create_session_op vhost_crypto_create_session; vhost_crypto_close_session_op vhost_crypto_close_session; - vhost_backend_mem_section_filter_op vhost_backend_mem_section_filter; vhost_get_inflight_fd_op vhost_get_inflight_fd; vhost_set_inflight_fd_op vhost_set_inflight_fd; vhost_dev_start_op vhost_dev_start; diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h index 6a173cb..c7e54676 100644 --- a/include/hw/virtio/vhost.h +++ b/include/hw/virtio/vhost.h @@ -315,7 +315,8 @@ uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits, */ void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits, uint64_t features); -bool vhost_has_free_slot(void); +unsigned int vhost_get_max_memslots(void); +unsigned int vhost_get_free_memslots(void); int vhost_net_set_backend(struct vhost_dev *hdev, struct vhost_vring_file *file); diff --git a/include/hw/virtio/virtio-mem.h b/include/hw/virtio/virtio-mem.h index ab0fe2b..5f5b02b 100644 --- a/include/hw/virtio/virtio-mem.h +++ b/include/hw/virtio/virtio-mem.h @@ -33,6 +33,7 @@ OBJECT_DECLARE_TYPE(VirtIOMEM, VirtIOMEMClass, #define VIRTIO_MEM_UNPLUGGED_INACCESSIBLE_PROP "unplugged-inaccessible" #define VIRTIO_MEM_EARLY_MIGRATION_PROP "x-early-migration" #define VIRTIO_MEM_PREALLOC_PROP "prealloc" +#define VIRTIO_MEM_DYNAMIC_MEMSLOTS_PROP "dynamic-memslots" struct VirtIOMEM { VirtIODevice parent_obj; @@ -44,7 +45,28 @@ struct VirtIOMEM { int32_t bitmap_size; unsigned long *bitmap; - /* assigned memory backend and memory region */ + /* + * With "dynamic-memslots=on": Device memory region in which we dynamically + * map the memslots. + */ + MemoryRegion *mr; + + /* + * With "dynamic-memslots=on": The individual memslots (aliases into the + * memory backend). + */ + MemoryRegion *memslots; + + /* With "dynamic-memslots=on": The total number of memslots. */ + uint16_t nb_memslots; + + /* + * With "dynamic-memslots=on": Size of one memslot (the size of the + * last one can differ). + */ + uint64_t memslot_size; + + /* Assigned memory backend with the RAM memory region. */ HostMemoryBackend *memdev; /* NUMA node */ @@ -82,6 +104,12 @@ struct VirtIOMEM { */ bool early_migration; + /* + * Whether we dynamically map (multiple, if possible) memslots instead of + * statically mapping the whole RAM memory region. + */ + bool dynamic_memslots; + /* notifiers to notify when "size" changes */ NotifierList size_change_notifiers; @@ -96,6 +124,8 @@ struct VirtIOMEMClass { /* public */ void (*fill_device_info)(const VirtIOMEM *vmen, VirtioMEMDeviceInfo *vi); MemoryRegion *(*get_memory_region)(VirtIOMEM *vmem, Error **errp); + void (*decide_memslots)(VirtIOMEM *vmem, unsigned int limit); + unsigned int (*get_memslots)(VirtIOMEM *vmem); void (*add_size_change_notifier)(VirtIOMEM *vmem, Notifier *notifier); void (*remove_size_change_notifier)(VirtIOMEM *vmem, Notifier *notifier); void (*unplug_request_check)(VirtIOMEM *vmem, Error **errp); |