Re: Urgent: NetBSD domUs will not start after Xen kernel update

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

On Mon, Oct 23, 2017 at 05:14:10PM +0100, Stephen Borrill wrote:
> Thanks for your quick reply. I can confirm that the following command gets
> VMs booting again:
> /opt/xensource/libexec/xen-cmdline --set-xen pv-linear-pt=true
> 
> i.e.
> # xl info | grep commandline
> xen_commandline        : dom0_mem=752M,max:752M watchdog ucode=scan dom0_max_vcpus=4 crashkernel=128M@256M console=vga vga=mode-0x0311 pv-linear-pt=true
> 
> However, while this is a useful workaround, it's not great going forward as
> the command line may be modified when other hotfixes or upgrades happen (or,
> of course, may not be under your administrative control). What's the roadmap
> for fixing this in the NetBSD kernel?

The x86 pmap makes heavy use of linear mappings, so it's not going to be
"fixed" anytime soon (actually I consider it's a bug in Xen that it is
disabled by default).

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