Re: [Xen-devel] [PATCH V4] xen/arm: domain_build: allocate lowmem for dom0 as much as possible

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Fri, 11 Nov 2016, Julien Grall wrote:
> > > The guest should be IPA agnostic and not care how the physical device is
> > > working when using PV drivers. So for me,
> > > this should be fixed in the DOM0 OS.
> > Do you consider driver domain guests?
> 
> The main point of driver domain is isolating a device/driver in a specific
> guest. For that you need an SMMU to secure the device, which would also solve
> the issue with 32-bit DMA-capable device.
> 
> So why would you want to do driver domain without an SMMU present?

There are many reasons: for example because you want Dom0 to be Linux
and the storage driver domain to be FreeBSD. Or because you want the
network driver domain to be QNX.

Without an SMMU, driver domains are not about security anymore, they are
about disaggregation and componentization, but they are still a valid
choice.

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel