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[vm] Refine VMA created with inherits_file_from

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This commit is contained in:
Hui, Chunyang 2023-08-24 03:09:43 +00:00 committed by volcano
parent b0989b6d46
commit 56f7ab02a5
3 changed files with 23 additions and 20 deletions
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1
src/libos/src/vm/vm_area.rs
View File

@ -46,6 +46,7 @@ impl VMArea {
new_perms: VMPerms,
access: VMAccess,
) -> Self {
debug_assert!(vma.is_superset_of(&new_range));
let new_backed_file = vma.file_backed.as_ref().map(|file| {
let mut new_file = file.clone();
let file_offset = file.offset();

22
src/libos/src/vm/vm_chunk_manager.rs
View File

@ -324,9 +324,6 @@ impl ChunkManager {
let old_end = containing_vma.end();
let protect_end = protect_range.end();
// Shrinked old VMA
containing_vma.set_end(protect_range.start());
// New VMA
let new_vma = VMArea::inherits_file_from(
&containing_vma,
@ -349,6 +346,9 @@ impl ChunkManager {
VMAObj::new_vma_obj(new_vma)
};
// Shrinked old VMA
containing_vma.set_end(protect_range.start());
containing_vmas.replace_with(VMAObj::new_vma_obj(containing_vma));
containing_vmas.insert(new_vma);
containing_vmas.insert(new_vma2);
@ -357,6 +357,15 @@ impl ChunkManager {
}
1 => {
let remain_vma = remain_vmas.pop().unwrap();
let new_vma = VMArea::inherits_file_from(
&containing_vma,
intersection_vma.range().clone(),
new_perms,
VMAccess::Private(current_pid),
);
VMPerms::apply_perms(&new_vma, new_vma.perms());
if remain_vma.start() == containing_vma.start() {
// mprotect right side of the vma
containing_vma.set_end(remain_vma.end());
@ -365,13 +374,6 @@ impl ChunkManager {
debug_assert!(remain_vma.end() == containing_vma.end());
containing_vma.set_start(remain_vma.start());
}
let new_vma = VMArea::inherits_file_from(
&containing_vma,
intersection_vma.range().clone(),
new_perms,
VMAccess::Private(current_pid),
);
VMPerms::apply_perms(&new_vma, new_vma.perms());
containing_vmas.replace_with(VMAObj::new_vma_obj(containing_vma));
containing_vmas.insert(VMAObj::new_vma_obj(new_vma));

20
src/libos/src/vm/vm_manager.rs
View File

@ -867,8 +867,6 @@ impl InternalVMManager {
let old_end = containing_vma.end();
let old_perms = containing_vma.perms();
containing_vma.set_end(protect_range.start());
let new_vma = VMArea::inherits_file_from(
&containing_vma,
protect_range,
@ -887,19 +885,13 @@ impl InternalVMManager {
)
};
containing_vma.set_end(protect_range.start());
// Put containing_vma at last to be updated first.
let updated_vmas = vec![new_vma, remaining_old_vma, containing_vma.clone()];
updated_vmas
}
_ => {
if same_start {
// Protect range is at left side of the cotaining vma
containing_vma.set_start(protect_range.end());
} else {
// Protect range is at right side of the cotaining vma
containing_vma.set_end(protect_range.start());
}
let new_vma = VMArea::inherits_file_from(
&containing_vma,
protect_range,
@ -908,6 +900,14 @@ impl InternalVMManager {
);
VMPerms::apply_perms(&new_vma, new_vma.perms());
if same_start {
// Protect range is at left side of the cotaining vma
containing_vma.set_start(protect_range.end());
} else {
// Protect range is at right side of the cotaining vma
containing_vma.set_end(protect_range.start());
}
// Put containing_vma at last to be updated first.
let updated_vmas = vec![new_vma, containing_vma.clone()];
updated_vmas