Re: [Xen-devel] [PATCH v2 19/21] xen/arm: Reserve region in guest memory for device passthrough

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 6 Aug 2014, Julien Grall wrote:
> Hi Stefano,
> 
> On 08/06/2014 05:27 PM, Stefano Stabellini wrote:
> > On Thu, 31 Jul 2014, Julien Grall wrote:
> >> This region will be split by the toolstack to allocate MMIO range for eac
> >> device.
> >>
> >> For now only reserve a 768MB region, this should be enought to passthrough
> >> multiple device at the same time.
> >>
> >> Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
> >>
> >> ---
> >>
> >> I can't allocate easily a range of 1GB in the current layout without shrink
> >> the first RAM bank. So I decided to use only 768MB. If in the future we 
> >> need
> >> more, then we will have to choose at runtime the guest layout.
> >>
> >>     Changes in v2:
> >>         - Bump the reserved region from 512MB to 768MB
> > 
> > 
> > Better than nothing.
> > Would it be possible to add a second region > 4GB? Maybe after RAM?
> > How hard would be to handle that?
> 
> It won't work if the guest is using short-descriptor translation table
> format because only 32 bits address will be supported.

I know.

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