[Xen-devel] Re: A race condition in xenlinux exit_mmap

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 1 Aug 2006, at 11:39, Li, Xin B wrote:

> > Do you mind creating a patch to do this? I can send you more
> > details if you like.
> Sure, pls send more info on this.
 1. Add an 'int has_foreign_mappings' to mmu_context structure
 2. Ensure the field is initialised in init_new_context() (e.g., 
memset-zero the whole structure; already done on x86/64)
 3. Set the field in direct_remap_pfn_range()
 4. Check the field in _arch_exit_mmap() to avoid calling mm_unpin().

That's it. Just needs testing.

 -- Keir


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