Re: [Xen-devel] HVM vs. PV in Reliability

[Yutao Liu <universalbillow@xxxxxxxxx>]

On Mon, Feb 21, 2011 at 6:01 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:

On Sun, 2011-02-20 at 12:55 +0000, Yutao Liu wrote:
> Hello,I'm wondering are there any datum that can compare the
> reliability/availability/dependability of HVM and PV, especially the
> driver of them?
> For example, how many bugs found in the drivers of HVM and PV?

> In the case of PVHVM drivers these are the same drivers so the numbers
> would be the same.

    But PV and HVM have different data flow, e.g. in PV, there is the communication between frontend and backend, but in HVM there        may be not, are there any bugs appear in these procedure?

> Can any experimental datum tell HVM model is safer or otherwise?...

> I don't know of any specific work in this area. It sounds like it would
> be an interesting project for someone with an interest in reliability
> engineering etc to undertake.

> If a driver in HVM crashed, will it affect DomU, Dom0, or others? and
> what about PV?

> All domains are equally isolated from the other domains in the system,
> be they domain 0, PV domU or other HVM domains. One domain cannot crash
> another unless it has particular privilege.

    What about when the frontend in domU communicate with backend in dom0? In my opinion,  the isolation in PV is not as well as in HVM(do you agree with me?), so are there any cases that the bug in frontend affect the backend?

Ian

> Is there some research or paper talk about this?
The last question:) is there any research ever talked about it? that is, the compare between HVM(both qemu-emulates and  with SRIOV) and PV in the area of dependability?

   Thanks so much:)

>
> I am so grateful if someone can give some advice about above, Thanks.
>
>
>
> -Luit

-- 
- Luit @ Parallel Processing Institute, Fudan University 
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel