svn commit: r216406 - stable/8/sys/amd64/conf

[Ion-Mihai Tetcu]

On Mon, 13 Dec 2010 15:31:48 +0000
"Robert N. M. Watson" <rwatson at FreeBSD.org> wrote:

> 
> On 13 Dec 2010, at 14:00, Ion-Mihai Tetcu wrote:
> 
> >>   Derive the XENHVM kernel from GENERIC, adding only the options
> >> required to support PV drivers (such as xenpci), and non-adptive
> >> locking (along with a comment about why).
> > 
> > What about the same for i386?
> 
> We don't currently support combining PV drivers with a non-PV kernel
> on i386; nor do we support a pure PV kernel on amd64. The former
> strikes me as more of a problem than the latter. Other than Amazon
> EC2, it seems most interesting targets will support HVM in practice,
> and benefit from PV drivers, but not require a pure PV kernel (i.e.,
> Xen-modified VM system).

I see. Thanks for the time you took to explain things, I'm very new to
XEN.
Do we have any docs somewhere (well, except the sources) about our XEN
support and various options / optimizations? I only know about
AdrianChadd's wiki pags and http://wiki.freebsd.org/FreeBSD/Xen (which
are nice, if you happen to know about XEN already and especially if you
want to work towards a FreebSD as XEN host).
I guess there are more interested people taht want just to run FreeBSD
as guest OS (my case).

> 
> Your kernel configuration is likely trying to build options XEN on
> i386 without PAE; we currently require options PAE to build a PV Xen
> kernel on i386. 

Hum, yes, I thought it doesn't make sense to have PAE when my VM has
only 1GB of RAM.
Maybe a comment in sys/i386/conf/XEN would help.

> (It also looks like "options XEN" is spelled "option
> XEN" in your config file below?)

Which proves I mange to make typos even when copy/pasting, sigh.


Thanks again,

-- 
IOnut - Un^d^dregistered ;) FreeBSD "user"
  "Intellectual Property" is   nowhere near as valuable   as "Intellect"
FreeBSD committer -> itetcu at FreeBSD.org, PGP Key ID 057E9F8B493A297B
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