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

[Yutao Liu <universalbillow@xxxxxxxxx>]

On Mon, Feb 21, 2011 at 7:18 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx> wrote:

On Mon, 2011-02-21 at 10:22 +0000, Yutao Liu wrote:
>
>
> 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?

> I was talking specifically about PVHVM, where the dataflow is the same.

> In any case I'm not aware of anyone having done an audit of the bug
> counts in this specific area etc.

> If you are interested in the numbers then I'm afraid the best suggestion
> I have is that you look back over the CVE history, or the version
> control etc and count them yourself.

>         > 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?

> That would be a serious bug in the backend, we are not currently aware
> of any such bugs.

>         > 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:)

> Not as far as I know, but I haven't really been paying much attention to
> this area of research.

    I see :)  Thanks so much.

    It's true that count bugs one by one is no meaning, I may try analyse it by other ways. And I may focus more on the HVM with SRIOV.

Ian.

-- 
- Luit @ Parallel Processing Institute, Fudan University 
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