Re: CVS commit: src/sys/arch

[Paul Goyette <paul%whooppee.com@localhost>]

> Module Name:    src
> Committed By:   cherry
> Date:           Tue May  6 04:26:24 UTC 2014
>
> Modified Files:
>         src/sys/arch/x86/x86: pmap.c
>         src/sys/arch/xen/include: xenpmap.h
>         src/sys/arch/xen/x86: x86_xpmap.c
>
> Log Message:
> Use the hypervisor to copy/zero pages. This saves us the extra overheads
> of setting up temporary kernel mapping/unmapping.
>
> riz@ reports savings of about 2s on a 120s kernel build.

This commit seems to have broken the ability to boot NetBSD under at 
least some hypervisors.  My VPS at prgmr.com boots fine with a kernel 
from just before this change.  However, with this commit, the following
panic occurs:

...
xc_dom_bzimageloader.c:350: panic: xc_dom_probe_bzimage_kernel: kernel is not a 
bzImage
close blk: backend=/local/domain/0/backend/vbd/550/51712 node=device/vbd/51712
close blk: backend=/local/domain/0/backend/vbd/550/51776 node=device/vbd/51776
close blk: backend=/local/domain/0/backend/vbd/550/51792 node=device/vbd/51792
panic: xen_pagezero

(Complete log from the boot is available.)

I have no control over the DOM0 environment, so I'm not sure of exactly 
which hypervisor is running.

(I suppose the problem could also be a boot-loader problem, so if it 
matters, this is with Grub 0.97)

The problem is not time-critical, since I have installed a 6.1.4_PATCH 
without any problem.  But perhaps we might want to revert this change 
for now...


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