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

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

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