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

From: Juergen Lock <>
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: <>
         Yuriy Kohut <>,
 [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);
 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.)
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