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[Xen-devel] Re: a xen question

  • To: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
  • From: Anh Nguyen <nguyenminhanh@xxxxxxxxx>
  • Date: Thu, 6 May 2010 13:45:14 -0700
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Stefano Stabellini <stefano@xxxxxxxxxxxxxx>
  • Delivery-date: Fri, 07 May 2010 07:55:45 -0700
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Hi George,

I am interested in the xen-linux kernel for PV guests.

For HVM guests, I find it a bit difficult to pinpoint exactly what devices are enabled because the ioemu-qemu-xen directory inside xen source seems to contain a lot of code not used by xen.


On Thu, May 6, 2010 at 1:36 PM, George Dunlap <George.Dunlap@xxxxxxxxxxxxx> wrote:
Ahn, the backends and frontends depends on which version of the kernel
you're using.  Do you want to look at the pv-ops kernel (the long-term
future), or the xen-linux kernel (a fork which will never make it
as-is into Linux, but is ATM more widely used)?

Stefano, which devices are enabled in qemu in our Xen tree?  Can you
give Anh some pointers on how to find out which files correspond to
those devices?  Thanks!


On Sun, May 2, 2010 at 12:47 AM, Anh Nguyen <nguyenminhanh@xxxxxxxxx> wrote:
> Hi George,
> I want to measure the size of Xen virtual devices (in term of lines of
> code), for both HVM and PV guests. From what I learnt, Xen uses
> Qemu daemon running in Dom 0 to emulate virtual devices for HVM guests. For
> PV guests, backend devices in Dom 0 talks to frontend devices in Dom U.
> I tried to post this question to xen-devel list but they did not go through.
> I would really appreciate if you could help me to answer them, or point me
> to the right direction:
> 1. What devices are offered to Xen HVM guests, what about Xen PV guests?
> 2. Where can I find the source code for those devices?
> Thanks a lot,
> Anh
> On Sat, May 1, 2010 at 5:18 PM, Sam King <kingst@xxxxxxxx> wrote:
>> Hi George,
>> One of my students, Anh (included in this email), has some questions about
>> Xen.  He has tried posting to the newsgroup without much luck, I was hoping
>> that you could either answer his questions or point him in the right
>> direction.
>> Cheers,
>> Sam

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