Re: HVM hypercalls

[veeruyours <veeruyours@gmail.com>]

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Hi,

I downloaded 2.6.38.7 and seen the CONFIG_XEN_PVHVM available. This feature
is automatically selected if XEN and X86_LOCAL_APIC are seletected.

config XEN_PVHVM
        def_bool y
        depends on XEN
        depends on X86_LOCAL_APIC

But, when i select XEN (CONFIG_XEN), it automatically selects "PARAVIRT".
Does that make my HVM guest into PV guest?

CONFIG_PARAVIRT:


This changes the kernel so it can modify itself when it is run
under a hypervisor, potentially improving performance significantly
over full virtualization.  However, when run without a hypervisor the kernel
is theoretically slower and slightly larger.

i do not want to convert HVM guest into PV, i just want to make hypercalls
from HVM guest to hypervisor.

Could you please suggest.

Thanks & Regards,
VSR.

On Tue, May 24, 2011 at 7:39 PM, Ian Campbell-10 [via Xen] <
ml-node+4422155-436573608-207502@n5.nabble.com> wrote:

> On Tue, 2011-05-24 at 14:58 +0100, veeruyours wrote:
> > I am running 2.6.30 (downloaded from kernel.org) on top of CENTOS 5.4.
>
> That is a very old kernel (June 2009 IIRC).
>
> > Do u mean i should enable following option
> >
> > --> Processor type and features
> >       [*] Paravirtualized guest support  --->
> >              --> [ ]   Xen guest support (NEW)
> >
> > But enabling this also selects PARAVIRT and does it make my guest PV
> > guest or PVHVM guest?
>
> This kernel only support PV and not PVHVM. You need something newer for
> PVHVM, I forget exactly when it was but 2.6.38/39 is certainly new
> enough.
>
> Ian.
>
>
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