Re: [XenARM] Xen-ARM and paravirt_ops?

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 10 Aug 2012, maheen butt wrote:
> Hi,
> I came to know from Xen-ARM wiki and other related pages that ARM Âport is 
> based onÂ
> xen-unstable and it can boot a Linux 3.0 based virtual machine (dom 0). for 
> reference
> https://lkml.org/lkml/2011/11/29/265
> 
> As Xen-ARM can boot Linux 3.0, it means that this hypervisor is usingÂ
> paravirt_ops infrastructure of kernel. I want to know that did you explicitlyÂ
> add paravirt_ops support in kernel for ARM?

The xen-unstable based ARM port uses the new virtualization extensions
introduced recently by ARM. Therefore it requires a Cortex-A15 processor
or newer in order to work. On the other hand no paravirt_ops support is
necessary in the kernel, as we are using nested paging in hardware.


> As far as I know paravirt_ops is an infrastructure given by Linux kernel to 
> supportÂ
> hypervisor. andÂhttp://wiki.xensource.com/xenwiki/XenParavirtOpsÂtells that
> at present paravirt_ops is available for x86_32, x86_64 and ia64 
> architectures.
> If this the case that you have add support of paravirt_ops in Linux kernel 
> for ARM
> architecture then what is the level of complexity for adding this kind of 
> support?

The level of complexity is non-trivial, fortunately we managed to avoid
it.

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