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Запуск Linux через pvops в домене 0 Xen

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Коротко: xen/pv_ops_dom0

From: Todd Deshane <deshantm@gmail.com> 
To: xen-devel mailing list <xen-devel@lists.xensource.com> 
Subject: [Xen-devel] pv_ops dom0 testing 
I am trying to get a pv_ops dom0 working for testing, 
but I am running into an elf_init error: 
 
(XEN) *** LOADING DOMAIN 0 *** 
(XEN) elf_init: not an ELF binary 
 
Full output attached. 
 
>From what I have read on the mailing lists, it seems 
that it is usually a problem with either grub or a 
corrupt dom0 kernel. 
 
Attached is my kernel config (2.6.28-rc6-tip). 
 
I followed the instructions on: 
http://wiki.xensource.com/xenwiki/XenParavirtOps 
 
Then I did make menuconfig and added: 
XEN_DOM0 
XEN_BLKDEV_BACKEND 
 
here are the two grub entries I tried 
 
title Xen 3.4-unstable / Ubuntu 8.10, kernel 2.6.28-rc6-tip 
root (hd0,0) 
kernel /boot/xen-3.4-unstable.gz loglvl=all guest_loglvl=all 
dom0_max_vcpus=1 com1=115200,8n1 console=com1 noreboot dom0_mem=512M 
module /boot/vmlinuz-2.6.28-rc6-tip root=/dev/sda1 ro console=tty0 
xencons=ttyS0,115200 
module /boot/initrd.img-2.6.28-rc6-tip 
 
title Xen 3.4-unstable / Ubuntu 8.10, kernel 2.6.28-rc6-tip 
uuid 30596923-1435-4516-809d-ef8cd2958532 
kernel /boot/xen-3.4-unstable.gz 
module /boot/vmlinuz-2.6.28-rc6-tip 
root=UUID=30596923-1435-4516-809d-ef8cd2958532 ro console=tty0 
module /boot/initrd.img-2.6.28-rc6-tip 
 
The error was reported by others (unanswered), but they might be unrelated: 
http://xen.markmail.org/message/grqiejrlax6tyutn?q=elf_init 
http://xen.markmail.org/message/r5y32q5yyuv4okgj?q=elf_init 
 
Any suggestions on what went wrong and/or what else to try?

From: Aviv Grafi <aviv@neocleus.com> 

I had the same issue few days ago: try to boot the vmlinux (and not 
vmlinuz) image that you can find in your kernel build directory. 
You can verify that you are booting the right image file by using the 
readelf tool.
Thanks for the tip Aviv. That got me a little farther. 
 
The debug output now ends with: 
(XEN) ioapic_guest_write: apic=0, pin=4, old_irq=4, new_irq=4 
(XEN) ioapic_guest_write: old_entry=000009f1, new_entry=000189f1 
(XEN) ioapic_guest_write: Attempt to modify IO-APIC pin for in-use IRQ! 
 
Full output attached. 
 
Do I need to either modify more of the default kernel settings or pass 
some more options to Xen or the dom0 kernel? 
 
When running non-debug mode, I don't see any dom0 output on the screen,. 
I tried a few different console= lines 
tty0, xvc0, hvc0.... but only Xen hypervisor output ending with: 
(XEN)  Xen is relinquishing VGA console 
 
Can someone post a working .config and grub config and/or the 
instructions to get to that point beyond the default setup? 
 
Cheers, 
Todd


I solved this one by adding "console=hvc0 earlyprintk=xen" to the dom0
kernel boot line (thanks to Jeremy Fitzhardinge [jeremy@goop.org]).
On Sat, Nov 29, 2008 at 5:32 PM, Aviv Grafi <aviv@neocleus.com> wrote: 
> I solved this one by adding "console=hvc0 earlyprintk=xen" to the dom0 
> kernel boot line (thanks to Jeremy Fitzhardinge [jeremy@goop.org]). 
 
Thanks again Aviv. I am really close now. The screen still shows nothing, 
but the debug output has the dom0 kernel boot. 
(Not sure why that would be... any thoughts?) 
 
In the debug output however I successfully get to the the 
(initramfs) prompt. 
 
Full output attached, but some interesting parts inline: 
 
(initramfs)cat /proc/cmdline 
root=/dev/sda1 ro console=tty0 xencons=ttyS0,115200 console=hvc0 earlyprintk=xen 
 
(initramfs) cat /proc/modules 
ata_piix 33586 1 - Loading 0xffffffffa0127000 
libata 196576 1 ata_piix, Live 0xffffffffa00f5000 
scsi_mod 184792 1 libata, Live 0xffffffffa00c5000 
r8169 46084 0 - Live 0xffffffffa00b7000 
mii 14464 1 r8169, Live 0xffffffffa00b1000 
tg3 139396 0 - Live 0xffffffffa008c000 
libphy 32896 1 tg3, Live 0xffffffffa007e000 
ehci_hcd 46726 1 - Loading 0xffffffffa0070000 
uhci_hcd 34037 1 - Loading 0xffffffffa0062000 
usbcore 174512 3 ehci_hcd,uhci_hcd, Live 0xffffffffa0035000 
thermal 27552 0 - Live 0xffffffffa002c000 
processor 55224 1 thermal, Live 0xffffffffa0019000 
fan 13832 0 - Live 0xffffffffa0013000 
fuse 65728 1 - Live 0xffffffffa0000000 
 
a listing of /dev doesn't show any sd* devices. 
 
So I am guessing I am running into a driver issue at this 
point. I will dig around more and compare my working 
vanilla linux config with the dom0 kernel to see if there 
is something missing in my dom0 kernel. 
 
Thanks for the help so far and if anything comes to mind 
why I don't see console output on the screen (and only in 
the debug output) that would be helpful to me. 
 
I'll report back on progress. 
 
If there are any obvious known workarounds, problems, bugs etc. 
let me know. I know that the pv_ops dom0 kernel is very much in 
development, but I am willing to try to work through that.


Xen
Xen

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