Re: [Xen-devel] Initial Mini-OS port to ARM64

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Sun, 2014-02-16 at 23:51 +0800, Chen Baozi wrote:
> Hi all,
> 
> It is much later than I used to expect. I guess it might be help
> to publish my work, though it is still not finished (and might not
> be finished very soon...). 
> 
> I began to try to port mini-os to ARM64 since last summer. Since
> the 64-bit guest support is not quite well at that time, this
> work had been stopped for a long time until two months ago.
> 
> Though it is still at very early stage, it at least can be built,
> setup a early page table for booting, parse the DTB passed by the
> hypervisor, and be debugged by printk at present. So I put it
> on github in case someone might be interested in it. Here is the
> url: https://github.com/baozich/minios-arm64

Cool. Thank you very much for sharing.

> Right now, there are some troubles to make GIC work properly,
> as I didnât consider mapping GICâs interface in address space and
> follows x86âs memory layout which make the kernel virtual address
> starts at 0x0. Iâll fix it as soon as possible.

Actually, having virtual memory start at 0x0 seems quite reasonable to
me, what is the problem?

Someone somewhere was thinking of making minios run without the MMU
enabled on ARM -- to save on the overhead IIRC. But it occurs to me here
that this would be problematic if we were to move the guest memory map
around -- which we are planning to do for 4.5. I think this means that
minios must use the MMU, at least by default.

I wouldn't necessarily object to the presence of an option to build an
MMU-less variant for specific use cases, so long as it was clear to
those enabling it that there VMs might only work on a single version of
Xen.

> Besides, there is still lots of work to be done. So any comments
> or patches are welcome.

Ian.


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