Re: [Xen-devel] Question regarding SLAB corruption

[Keir Fraser <keir@xxxxxxxxxxxxx>]

On 9/7/07 13:07, "Lukas Hejtmanek" <xhejtman@xxxxxxxxxxx> wrote:

> According to IB developers, it uses alloc_pages and then pci_map_sg which they
> state that is DMA API. So, is it correct approach?

Well, we currently assume that segments of a scatterlist (as passed to
pci_map_sg) do not cross page boundaries. It looks like this assumption is
broken (certainly for the infiniband driver!).

I've just checked in the attached patch to fix this issue. Please give it a
try in your dom0 tree.

> I did debug like this - so it prints physical and virtual addresses and they
> seems to be perfectly contiguous. Are the physical addresses real physical
> addresses or virtualized by Xen hypervisor?

You want to use virt_to_machine(). As you say, the addresses returned by
virt_to_phys() are virtual-physical, which is not what you want.

 -- Keir

map_sg.patch
Description: Binary data

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