Re: Can I specify a physical memory region for a domU

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

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@oracle.com> wrote:
> >> > Make sure you set
> >> >  pci_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?

> pci_set_consistent_dma_mask() and dma_set_mask() all succeeded.

And what kernel did you use?
> 
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