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Panic if overriding existing device page tables

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This commit is contained in:
Yuke Peng 2025-02-18 15:25:37 +08:00 committed by Tate, Hongliang Tian
parent eca88697dd
commit bad1a7a79a
1 changed files with 4 additions and 2 deletions
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6
ostd/src/arch/x86/iommu/dma_remapping/context_table.rs
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@ -5,7 +5,6 @@
use alloc::collections::BTreeMap;
use core::mem::size_of;
use log::warn;
use ostd_pod::Pod;
use super::second_stage::{DeviceMode, PageTableEntry, PagingConsts};
@ -116,9 +115,12 @@ impl RootTable {
* size_of::<ContextEntry>(),
)
.unwrap();
if bus_entry.is_present() {
warn!("IOMMU: Overwriting the existing device page table");
panic!("existing device page tables should not be overridden");
}
// Activate page table.
let address = unsafe { page_table.root_paddr() };
context_table.page_tables.insert(address, page_table);
let entry = ContextEntry(address as u128 | 1 | 0x1_0000_0000_0000_0000);