Re: [Xen-devel] Can I specify a physical memory region for a domU

[Eric Camachat <eric.camachat@xxxxxxxxx>]

On Thu, Sep 8, 2011 at 1:00 PM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
>> > Make sure you set
>> > Âpci_set_consistent_dma_mask(dev, DMA_BIT_MASK(31));
>> >
>> > on top of pci_set_dma_mask(dev, DMA_BIT_MASK(31));
>> > in your driver.
>> >
>> A lot of work to port the driver to PV domU, hope it works.
>
> Hm? That is the normal way you would write drivers in the Linux kernel.
> You use the DMA API in it to deal with the PCI devices.
>
> Is the PV domU a Linux kernel or something else?
>

Yes, the PV domU is linux kernel.

I tested pci_alloc_consistent() verified on baremetal it worked with 8GB SDRAM.
But while I ran it in XEN, pci_alloc_consistent() cannot allocate
memory successfully for 4MB although pci_set_dma_mask(),
pci_set_consistent_dma_mask() and dma_set_mask() all succeeded.

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