Re: port-xen/53267 (XEN amd64 DomU (Dom0??) NetBSD current USERMODE() fails)

[Cherry G.Mathew <cherry%zyx.in@localhost>]

Robert Elz <kre%munnari.OZ.AU@localhost> writes:

> The following reply was made to PR port-xen/53267; it has been noted by GNATS.
>
> From: Robert Elz <kre%munnari.OZ.AU@localhost>
> To: gnats-bugs%NetBSD.org@localhost
> Cc: cherry%netbsd.org@localhost
> Subject: Re: port-xen/53267 (XEN amd64 DomU (Dom0??) NetBSD current USERMODE() fails)
> Date: Wed, 09 May 2018 06:02:44 +0700
>
>  I have done a kernel bisect on -current from when netbsd-8 was branched,
>  until (more or less) now, and found that before the following mods,
>  the XEN USERMODE() macro was performing correctly, and after them
>  it is not (it always says "kernel mode" - so does the KERNELMODE()
>  macro, not very surprisingly).
>  
>  That is, I tried kernels from immediately before, and immediately after,
>  this set of mods, and it worked before, failed after.
>  
>  cherry - can you have a look and see if you can see why your changes broke
>  this, and perhaps find a suitable fix?
>  
>  commit 2017.11.06.15.21.23 cherry src/sys/arch/xen/conf/files.xen 1.163
>  commit 2017.11.06.15.27.09 cherry src/sys/arch/xen/x86/xen_ipi.c 1.23
>  commit 2017.11.06.15.27.09 cherry src/sys/arch/xen/xen/clock.c 1.65
>  commit 2017.11.06.15.27.09 cherry src/sys/arch/xen/xen/if_xennet_xenbus.c 1.72
>  commit 2017.11.06.15.27.09 cherry src/sys/arch/xen/xen/xbd_xenbus.c 1.77
>  commit 2017.11.06.15.27.09 cherry src/sys/arch/xen/xen/xbdback_xenbus.c 1.64
>  commit 2017.11.06.15.27.09 cherry src/sys/arch/xen/xen/xencons.c 1.42
>  commit 2017.11.06.15.27.09 cherry src/sys/arch/xen/xen/xennetback_xenbus.c 1.60
>  commit 2017.11.06.15.27.09 cherry src/sys/arch/xen/xenbus/xenbus_comms.c 1.16
>  

This was a pretty intrusive change ( we switched to the x86 common
interrupt code ), so I'll need a bit of time to figure it out.

I'll send an update as soon as I get one, unless someone beats me to
it. 
-- 
~cherry