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On Tue, 2006-11-14 at 14:38 -0700, Ky Srinivasan wrote:
> When is this turned on.

It is turned on by passing supervisor_mode_kernel=y when you build xen.

Ian.


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Ian,

Sorry for asking an imprecise question. I understand the mechanism for turning on this flag. What was not clear to me was when we would turn this on.

Regards,

K. Y

>>> On Wed, Nov 15, 2006 at 4:52 AM, in message
<1163584366.9325.28.camel@localhost.localdomain>, Ian Campbell
<Ian.Campbell@XenSource.com> wrote:
> On Tue, 2006- 11- 14 at 14:38 - 0700, Ky Srinivasan wrote:
>> When is this turned on.
>
> It is turned on by passing supervisor_mode_kernel=y when you build xen.
>
> Ian.


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On Wed, 2006-11-15 at 07:52 -0700, Ky Srinivasan wrote:
> Sorry for asking an imprecise question. I understand the mechanism for turning
> on this flag. What was not clear to me was when we would turn this on.

Probably never.

It was mainly intended as a proof of concept. There once was an idea
that it might be possible run a Xen/linux kernel+a thin shim on bare
metal with negligible loss of performance. With the paravirt ops
approach being taken with the upstreaming work there is little point in
that anymore.

Ian.


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