kern/148262: [xen] [panic] HYPERVISOR_update_va_mapping

[Juergen Lock]

The following reply was made to PR kern/148262; it has been noted by GNATS.

From: Juergen Lock <nox at jelal.kn-bremen.de>
To: bug-followup at freebsd.org
Cc:  
Subject: Re: kern/148262: [xen] [panic] HYPERVISOR_update_va_mapping
Date: Sat, 2 Oct 2010 17:31:51 +0200

 Oops forgot to Cc bug-followup@ ...
 
 Subject: Re: kern/148262: [xen] [panic] HYPERVISOR_update_va_mapping
 In-Reply-To: <201007031118.o63BIvvB062963 at freefall.freebsd.org>
 Cc: freebsd-bugs at FreeBSD.org, freebsd-xen at FreeBSD.org,
         Yuriy Kohut <ykohut at onapp.com>, jkim at FreeBSD.org
 
 [kern/149853 is a duplicate of this]
 
 I don't use xen myself here but I helped someone on irc troubleshoot
 the same crash (before I saw these PRs), and found out the reason it
 didn't happen on 8.0 is the x86bios code is new in 8.1 and xen doesn't
 like this call in x86bios_map_mem():
 
 	x86bios_ivt = pmap_mapbios(X86BIOS_IVT_BASE, X86BIOS_IVT_SIZE);
 
 see:
 
 	http://fxr.watson.org/fxr/source/compat/x86bios/x86bios.c?v=FREEBSD8#L498
 
 It seems the only consumers of x86bios are atkbd(4), dpms(4), and
 vesa(4), and indeed removing atkbd(4) from the xen kernel got his
 domU running.
 
 (And now that I just looked at /sys/i386/conf/XEN in svn I see this
 was already fixed in r204157, it only never got MFCd.)