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Re: [Xen-users] [Xen-devel] Cannot Start Linux Paravirtualized (PV) Guests with Xen 4.2-unstable

On 20/03/2012 16:36, Ian Campbell wrote:
On Tue, 2012-03-20 at 08:01 +0000, Teo En Ming (Zhang Enming) wrote:
On 20/03/2012 15:12, Ian Campbell wrote:
On Tue, 2012-03-20 at 01:11 +0000, Teo En Ming (Zhang Enming) wrote:
Please can you provide a single guest configuration file which
demonstrates the issue which you are seeing and the output of running
"xl -vvv create -c<cfg>" for that precisely that<cfg>    file. Please
also attach exactly the /var/log/xen/qemu-dm-<name>.log
and /var/log/xen/xl-<name>.log produced by exactly that invocation of
I will be attaching my How To / tutorial / documentation shortly.
Please provide exactly and only the information I asked for in my
previous mail (quoted above). Otherwise I cannot help you. I am not
going to try and infer the answers to those questions from a How To.


Dear Ian,

As I told you before, I cannot start Linux PV guests in Xen
4.2-unstable. There is a bug with xl in Xen 4.2-unstable. However, I am
able to start Fedora 16 amd64 PV domU in Xen 4.1.3-rc1-pre.

My F16 Linux PV guest configuration file is as follows:

Thank you.

The output of "sudo xl -vvv create -c Fedora16x86_64" is as follows:
Fedora release 16 (Verne)
Kernel 3.2.10-3.fc16.x86_64 on an x86_64 (hvc0)

fedora16-x86-64 login:


Please look at the screenshot of Fedora 16 x86-64 PV domU as follows:

Both this image and the console output appear to show a guest which has
booted just fine (e.g. I have quoted the login prompt from your console
log above). What exactly do you think has not worked?


Dear Ian,

I want to make 2 points.

1) Linux PV guests cannot start in Xen 4.2-unstable with XL. Linux PV guests can only successfully start in Xen 4.1.3-rc1-pre.

2) The performance of Fedora 16 x86-64 PV guest in Xen 4.1.3-rc1-pre is really very poor and sluggish. Do you want to watch a video of it?

Thank you for your understanding.

Yours sincerely,

Teo En Ming (Zhang Enming)

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