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vm: implement lazy-attach cow-duplication of vm-objects attached to a controller

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This commit is contained in:
max 🍓
2026-04-19 20:16:19 +01:00
parent b3be4c541b
commit 4a9e907a75
9 changed files with 332 additions and 72 deletions
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include/kernel/vm-controller.h
+28 -13
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@@ -9,34 +9,35 @@ struct thread;
struct equeue;
struct vm_object;
enum page_request_status {
PAGE_REQUEST_PENDING = 0,
PAGE_REQUEST_IN_PROGRESS,
PAGE_REQUEST_COMPLETE,
PAGE_REQUEST_ASYNC,
enum vm_request_status {
VM_REQUEST_PENDING = 0,
VM_REQUEST_IN_PROGRESS,
VM_REQUEST_COMPLETE,
VM_REQUEST_ASYNC,
};
struct vm_controller {
struct object vc_base;
/* tree of pending page requests */
/* tree of pending vm requests */
struct btree vc_requests;
/* the equeue to send async page requests to */
struct equeue *vc_eq;
equeue_key_t vc_eq_key;
/* the number of page requests queued with status PAGE_REQUEST_PENDING.
/* the number of page requests queued with status VM_REQUEST_PENDING.
* used to assert/clear VM_CONTROLLER_SIGNAL_REQUEST_RECEIVED */
size_t vc_requests_waiting;
};
struct page_request {
struct vm_request {
uint64_t req_id;
unsigned int req_type;
enum page_request_status req_status;
enum vm_request_status req_status;
kern_status_t req_result;
spin_lock_t req_lock;
equeue_key_t req_object;
struct vm_object *req_object;
struct thread *req_sender;
/* this node is added to vm-controller vc_requests list */
struct btree_node req_node;
/* these values are used for VM_REQUEST_READ and VM_REQUEST_DIRTY */
off_t req_offset;
size_t req_length;
};
@@ -48,7 +49,7 @@ extern struct vm_controller *vm_controller_create(void);
extern kern_status_t vm_controller_recv(
struct vm_controller *ctrl,
equeue_packet_page_request_t *out);
equeue_packet_vm_request_t *out);
extern kern_status_t vm_controller_recv_async(
struct vm_controller *ctrl,
struct equeue *eq,
@@ -62,6 +63,14 @@ extern kern_status_t vm_controller_create_object(
size_t data_len,
vm_prot_t prot,
struct vm_object **out);
extern kern_status_t vm_controller_prepare_attach(
struct vm_controller *ctrl,
uint64_t req_id,
struct vm_object **out_vmo);
extern kern_status_t vm_controller_finish_attach(
struct vm_controller *ctrl,
uint64_t req_id,
equeue_key_t new_key);
extern kern_status_t vm_controller_detach_object(
struct vm_controller *ctrl,
struct vm_object *vmo);
@@ -72,10 +81,16 @@ extern kern_status_t vm_controller_supply_pages(
struct vm_object *src,
off_t src_offset,
size_t count);
extern void vm_controller_fulfill_requests(
struct vm_controller *ctrl,
equeue_key_t object,
off_t offset,
size_t length,
kern_status_t result);
extern kern_status_t vm_controller_send_request(
struct vm_controller *ctrl,
struct page_request *req,
struct vm_request *req,
unsigned long *irq_flags);
DEFINE_OBJECT_LOCK_FUNCTION(vm_controller, vc_base)