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

[Eric Camachat <eric.camachat@xxxxxxxxx>]

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.

>
>> 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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>

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