Re: [PATCH 0/3] xen: Fix oops when mapping/unmapping addr above 1Gb

[Jeremy Fitzhardinge]

Mark McLoughlin wrote:
> Hi,
>         In Fedora rawhide we're currently seeing oopses whenever
> a processes dlopen()s a library which prelink() has previously
> relocated above 1Gb. Some more details at:
>
>   https://bugzilla.redhat.com/436453
>
>         The issue seems to be that during xen_pgd_pin(), we only
> pin PTE pages, but xen's release_pmd() tries to unpin PMD pages
> too.
>
>         The following series of patches is against the latest
> x86 tree.
>   

Hm, OK.  I'm trying to work out what happened here.  I guess its a 
latent bug which is only visible now that its possible to incrementally 
free pmds.

A side note is that I'm planning on pinning pmds in the future, so that 
we can get away replace the full pgd page per mm with a pgd page per cpu.

   J
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