Re: booting xen [was Re: serial console puzzle]

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Mon, May 10, 2021 at 08:44:35AM -0700, Brian Buhrow wrote:
> 	hello Patrick.  In reading through this thread, this line caught my  eye from your output:
> mm.c:1142:d0v0 Attempt to create linear p.t. with write perms
> 
> 	I wonder if you've compiled Xen with CONFIG_LINEAR_PT_SUPPORT turned off somehow, or, if
> it somehow got set to false by default?  According to: 
> http://xenbits.xen.org/docs/unstable/misc/xen-command-line.html
> linear_pt mode is becoming a legacy feature which NetBSD still relies on.  Xen-4.15 is a pretty
> recent version of Xen and I wonder if someone changed the default from true to false or if the
> compile-time options got changed to exclude that feature?  According to the page  referenced
> above, having the feature turned on if you don't need it increases the security risk of the
> system.  Since many folks forget that anything exists outside of Linux, it's possible this
> feature got switched off.
> Like Greg, I'm grasping at straws here, but it might be worth verifying.

pkgsrc turns it on when building Xen. Xen 4.15 boots dom0 (and PV domUs)
fine for me.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--