Re: [Xen-devel] [PATCH RFC] p2m: p2m_mmio_direct set RW permissions

[Elena Ufimtseva <elena.ufimtseva@xxxxxxxxxx>]

----- JBeulich@xxxxxxxx wrote:

> >>> On 22.01.15 at 16:11, <elena.ufimtseva@xxxxxxxxxx> wrote:
> > ----- JBeulich@xxxxxxxx wrote:
> >> A fundamental question is what business devices have to DMA their
> >> own (or other devices') MMIO space. I could remotely see a need
> >> for this for e.g. frame buffers, but I have difficulty
> understanding
> >> this for USB devices. Please at the very least provide details on
> the
> >> MMIO regions that those devices have, and which of them you
> >> observed IOMMU faults on.
> > 
> > The IOMMU Page fault addresses are 0xd5d45 and 0xd5d46 in case of 
> > ThinkCentre machine.
> > If you would like to see any other details I am happy to send them
> as well.
> 
> Yes, the two numbers alone don't tell me anything - I can't even
> judge whether they're MFNs, GFNs, or host/guest physical
> addresses that way. I also specifically asked for providing the
> BAR values of the USB controller in question, to be able to match
> up the numbers. Logs and/or lspci output will be most useful for
> this purpose.
> 
> Jan

I will send all what I have.

Elena


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