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