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

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 1 Aug 2006, at 11:24, hanzhu wrote:

> Why not just reuse VM_FOREIGN(blktap uses this flag to represent 
> foreign mapped vma) flag to unmap the foreign mapped pages before call 
> arch_exit_mmap? This could be a simple alternative.
VM_FOREIGN has its own semantics (e.g., need to fill in 
vma->vm_private_data appropriately). A mm-wide flag in mmu_context 
would be quite simple to add, and also entirely hidden in arch code. 
It's then easily removed when we implement a solution based on software 
bits in PTEs.
 -- Keir


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