Re: [Xen-devel] [PATCH] x86-64 linux: unmap temporary mappings established for setup of 1:1 mappings

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 31 May 2006, at 14:17, Jan Beulich wrote:

> The temporary mappings needed to set up the 1:1 mappings must be torn 
> down after use; otherwise they may trigger the
> WARN_ON() in vmap_pte_range() (namely if the chunk allocated to hold 
> kernel and initial page tables gets close to or
> exceeds 128Mb, or if a sufficiently high mem= argument causes the 
> static allocations to grow beyond 128Mb, which in
> either case means these mappings extend into the modules area).
I've applied this to -unstable, but in this patch I only see code to 
destroy the extended init mappings. What happens if you have a really 
big initrd (for example)? That will push the initial pagetables up into 
the modules area -- is that handled correctly now or is more fixup 
required?
Also your patch didn't apply to 3.0-testing. You'll need to supply a 
version specifically for -testing if you want it applied there.
 -- Keir


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