Re: [Xen-devel] clarification regarding paravirtualized kernel for dom0

[Aastha Mehta <aasthakm@xxxxxxxxx>]

Hi Matt,

Thank you very much for the clarification. This is good news then. Please also tell, what the xen_caps indicate as well. And, I still have some confusion regarding the different virtualization modes. When we say that we have, for example, a PV on HVM system, does the capability of hypervisor still remain HVM? 

The new virtualization mode available in xen-4.3 onwards - PV on H - does this only reflect how the guest OS may interact with dom0 and hypervisor? What do these things mean in the context of dom0?

Regards

On 9 September 2013 00:40, Matt Wilson <msw@xxxxxxxxx> wrote:

On Sun, Sep 08, 2013 at 01:23:19PM +0200, Aastha Mehta wrote:
> Hello,
>
> I want to install paravirtualized dom0 kernel (from source) on  my machine,
> but I seem to be missing something. Based on the configuration instructions
> at http://wiki.xen.org/wiki/Mainline_Linux_Kernel_Configs, I am trying to
> configure linux kernel 3.10.10 for dom0 and domU. I do not find the
> CONFIG_PARAVIRT_GUEST flag in my .config at all. There are CONFIG_PARAVIRT
> and CONFIG_HYPERVISOR_GUEST (as mentioned that this is available 3.10+
> onwards only). Currently the dom0 is installed with hvm capabilities only.

Hi Aastha,

The "virt_caps" field in "xl info" refers to capabilities of the
hypervisor, not the dom0.

> # xl info
> release                : 3.10.10-xen
> ...
> hw_caps                :
> bfebfbff:28100800:00000000:00007f00:77bae3ff:00000000:00000001:00000281
> virt_caps              : hvm hvm_directio
> ...
> xen_version            : 4.4-unstable
> xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
> hvm-3.0-x86_32p hvm-3.0-x86_64
>
> Am I trying to use a wrong kernel? Is it the case that pvops for dom0 is
> only available on kernel 2.6.32.x?

If you have a system booting with the 3.10.10 kernel and "xl info"
works (as it appears to have above), you've experienced success.

--msw

--
Aastha Mehta

MPI-SWS, Germany
E-mail: aasthakm@xxxxxxxxxxx

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