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fix L4 page table pinning

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This commit is contained in:
Alex Zenla
2024-01-16 19:25:38 -08:00
parent 044795db0f
commit 0d68db8523
2 changed files with 35 additions and 32 deletions
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28
xenclient/src/mem.rs
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@ -96,6 +96,7 @@ impl PhysicalPages<'_> {
.call
.mmap(0, actual_mmap_len)
.ok_or(XenClientError::new("failed to mmap address"))?;
debug!("mapped {:#x} foreign bytes at {:#x}", actual_mmap_len, addr);
let result = self.call.mmap_batch(self.domid, num as u64, addr, pfns)?;
if result != 0 {
return Err(XenClientError::new("mmap_batch call failed"));
@ -130,16 +131,25 @@ impl PhysicalPages<'_> {
}
pub fn unmap(&mut self, pfn: u64) -> Result<(), XenClientError> {
let mut page: Option<(usize, &PhysicalPage)> = None;
for (i, item) in self.pages.iter().enumerate() {
if pfn >= item.pfn && pfn < (item.pfn + item.count) {
break;
}
page = Some((i, item));
}
let page = self.pages.iter().find(|x| x.pfn == pfn);
if page.is_none() {
return Err(XenClientError::new("failed to unmap pfn"));
return Err(XenClientError::new("unable to find page to unmap"));
}
let page = page.unwrap();
unsafe {
let err = munmap(
page.ptr as *mut c_void,
(page.count << X86_PAGE_SHIFT) as usize,
);
debug!(
"unmapped {:#x} foreign bytes at {:#x}",
(page.count << X86_PAGE_SHIFT) as usize,
page.ptr
);
if err != 0 {
return Err(XenClientError::new("failed to munmap page"));
}
}
Ok(())
}