Re: [Xen-devel] BUG: bad page map under Xen

[David Vrabel <david.vrabel@xxxxxxxxxx>]

On 26/12/13 06:39, Zhang, Yang Z wrote:
> 
> Any conclusion for this issue? Our custom also saw the same issue
> that they want to map an MMIO to userspace address(through UIO
> approach), but current ->mmap function call remap_pfn_range without
> setting _PAGE_IOMAP and cause the host crashed. It seems all
> userspace device drivers that tries to map device's mmio will caused
> host crashed.
> 
> They are using 3.10 kernel.

My first attempt at fixing this was broken and I need to find time for
another look.

There were problems with pages that started out pre-ballooned.

David

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