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No need to flush TLB on mapping without overwritting

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Zhang Junyang
2024-09-14 11:29:54 +08:00
committed by Tate, Hongliang Tian
parent 5df3c9b749
commit addf42c3f8
1 changed files with 4 additions and 3 deletions
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5
ostd/src/mm/vm_space.rs
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@ -350,13 +350,14 @@ impl CursorMut<'_, '_> {
/// This method will bring the cursor to the next slot after the modification. /// This method will bring the cursor to the next slot after the modification.
pub fn map(&mut self, frame: Frame, prop: PageProperty) { pub fn map(&mut self, frame: Frame, prop: PageProperty) {
let start_va = self.virt_addr(); let start_va = self.virt_addr();
let end_va = start_va + frame.size();
// SAFETY: It is safe to map untyped memory into the userspace. // SAFETY: It is safe to map untyped memory into the userspace.
let old = unsafe { self.pt_cursor.map(frame.into(), prop) }; let old = unsafe { self.pt_cursor.map(frame.into(), prop) };
self.issue_tlb_flush(TlbFlushOp::Range(start_va..end_va), old); if old.is_some() {
self.issue_tlb_flush(TlbFlushOp::Address(start_va), old);
self.dispatch_tlb_flush(); self.dispatch_tlb_flush();
} }
}
/// Clear the mapping starting from the current slot. /// Clear the mapping starting from the current slot.
/// ///