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vm: evict PTE entries for transferred vm-object pages

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max 🍓
2026-03-15 14:40:24 +00:00
parent 399742cabf
commit a2e918c428
3 changed files with 42 additions and 6 deletions
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34
vm/vm-object.c
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@@ -1,4 +1,4 @@
#include <kernel/printk.h>
#include <kernel/address-space.h>
#include <kernel/sched.h>
#include <kernel/util.h>
#include <kernel/vm-controller.h>
@@ -236,7 +236,6 @@ extern struct vm_object *vm_object_create_in_place(
i += VM_PAGE_SIZE, offset += VM_PAGE_SIZE) {
struct vm_page *pg = vm_page_get(i);
if (!pg) {
printk("vm-object: invalid physical address %08llx", i);
object_unref(&vmo->vo_base);
return NULL;
}
@@ -871,8 +870,35 @@ kern_status_t vm_object_transfer(
moved += VM_PAGE_SIZE;
}
/* TODO evict all page table entries that reference the transferred
* pages in `src` */
struct queue_entry *cur = queue_first(&src->vo_mappings);
off_t src_limit = src_offset + count - 1;
while (cur) {
struct vm_area *area = QUEUE_CONTAINER(
struct vm_area,
vma_object_entry,
cur);
off_t area_offset = area->vma_object_offset;
off_t area_limit
= area_offset + (area->vma_limit - area->vma_base);
if (src_offset > area_limit || src_limit < area_offset) {
cur = queue_next(cur);
continue;
}
off_t unmap_offset = MAX(area_offset, src_offset);
off_t unmap_limit = MIN(area_limit, src_limit);
virt_addr_t base
= area->vma_base + (unmap_offset - area_offset);
virt_addr_t limit = base + (unmap_limit - unmap_offset);
for (virt_addr_t i = base; i < limit; i += VM_PAGE_SIZE) {
pmap_remove(area->vma_space->s_pmap, i);
}
cur = queue_next(cur);
}
if (nr_moved) {
*nr_moved = moved;