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

[Eric Camachat <eric.camachat@xxxxxxxxx>]

On Fri, Sep 9, 2011 at 9:10 AM, Eric Camachat <eric.camachat@xxxxxxxxx> wrote:
> On Thu, Sep 8, 2011 at 6:05 PM, Konrad Rzeszutek Wilk
> <konrad.wilk@xxxxxxxxxx> wrote:
>> On Thu, Sep 08, 2011 at 05:15:06PM -0700, Eric Camachat wrote:
>>> 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(),
>>
>> And what is the error?
>
> I cannot see any error, it just returned NULL.

BTW, I will succeed if I allocate 2MB only.

>
>>
>>> pci_set_consistent_dma_mask() and dma_set_mask() all succeeded.
>>
>> And what kernel did you use?
> I am using linux-2.6.32.24.
>
>>>
>>> _______________________________________________
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>>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>>> http://lists.xensource.com/xen-devel
>>
>

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