feat(mm): 实现缺页中断处理，支持页面延迟分配和写时拷贝，以及用户栈自动拓展 (#715)

* 实现缺页中断处理 * 完善页表拷贝逻辑 * 优化代码结构 * 完善缺页异常信息 * 修改大页映射逻辑 * 修正大页映射错误 * 添加缺页中断支持标志 * 实现用户栈自动拓展功能
2025-06-21 13:46:36 +00:00 · 2024-04-22 15:10:47 +08:00
parent cb02d0bbc2
commit a17651b14b
16 changed files with 1657 additions and 135 deletions
--- a/kernel/src/mm/madvise.rs
+++ b/kernel/src/mm/madvise.rs
@ -0,0 +1,84 @@
+use system_error::SystemError;
+
+use crate::arch::{mm::PageMapper, MMArch};
+
+use super::{page::Flusher, syscall::MadvFlags, ucontext::LockedVMA, VmFlags};
+
+impl LockedVMA {
+    pub fn do_madvise(
+        &self,
+        behavior: MadvFlags,
+        _mapper: &mut PageMapper,
+        _flusher: impl Flusher<MMArch>,
+    ) -> Result<(), SystemError> {
+        //TODO https://code.dragonos.org.cn/xref/linux-6.6.21/mm/madvise.c?fi=madvise#do_madvise
+        let mut vma = self.lock();
+        let mut new_flags = *vma.vm_flags();
+        match behavior {
+            MadvFlags::MADV_REMOVE => {
+                // TODO
+            }
+
+            MadvFlags::MADV_WILLNEED => {
+                // TODO
+            }
+
+            MadvFlags::MADV_COLD => {
+                // TODO
+            }
+
+            MadvFlags::MADV_PAGEOUT => {
+                // TODO
+            }
+
+            MadvFlags::MADV_FREE => {
+                // TODO
+            }
+
+            MadvFlags::MADV_POPULATE_READ | MadvFlags::MADV_POPULATE_WRITE => {
+                // TODO
+            }
+
+            MadvFlags::MADV_NORMAL => {
+                new_flags = new_flags & !VmFlags::VM_RAND_READ & !VmFlags::VM_SEQ_READ
+            }
+
+            MadvFlags::MADV_SEQUENTIAL => {
+                new_flags = (new_flags & !VmFlags::VM_RAND_READ) | VmFlags::VM_SEQ_READ
+            }
+            MadvFlags::MADV_RANDOM => {
+                new_flags = (new_flags & !VmFlags::VM_SEQ_READ) | VmFlags::VM_RAND_READ
+            }
+
+            MadvFlags::MADV_DONTFORK => new_flags |= VmFlags::VM_DONTCOPY,
+
+            MadvFlags::MADV_DOFORK => {
+                if vma.vm_flags().contains(VmFlags::VM_IO) {
+                    return Err(SystemError::EINVAL);
+                }
+                new_flags &= !VmFlags::VM_DONTCOPY;
+            }
+
+            MadvFlags::MADV_WIPEONFORK => {
+                //MADV_WIPEONFORK仅支持匿名映射，后续实现其他映射方式后要在此处添加判断条件
+                new_flags |= VmFlags::VM_WIPEONFORK;
+            }
+
+            MadvFlags::MADV_KEEPONFORK => new_flags &= !VmFlags::VM_WIPEONFORK,
+
+            MadvFlags::MADV_DONTDUMP => new_flags |= VmFlags::VM_DONTDUMP,
+
+            //MADV_DODUMP不支持巨页映射，后续需要添加判断条件
+            MadvFlags::MADV_DODUMP => new_flags &= !VmFlags::VM_DONTDUMP,
+
+            MadvFlags::MADV_MERGEABLE | MadvFlags::MADV_UNMERGEABLE => {}
+
+            MadvFlags::MADV_HUGEPAGE | MadvFlags::MADV_NOHUGEPAGE => {}
+
+            MadvFlags::MADV_COLLAPSE => {}
+            _ => {}
+        }
+        vma.set_vm_flags(new_flags);
+        Ok(())
+    }
+}