[Xen-devel] Re: is_xen_swiotlb_buffer() vs CONFIG_HIGHMEM

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

On 12/14/2009 07:02 AM, Jan Beulich wrote:
> shouldn't is_xen_swiotlb_buffer() also check against e.g. highstart_pfn
> to deal with wrap-around potentially leading to aliasing of
> [xen_io_tlb_start,xen_io_tlb_end)?
>    
So what you're saying is that if the pfn is for a high page, then 
"__va(pfn << PAGE_SHIFT);" is simply invalid.  The resulting addr is 
undefined, and may end up erroneously aliasing with the xen tlb buffer.
Do I understand your concern properly?

    J

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