[Xen-users] Help to debug xen dom0 boot failure

[Paul Dunda <paul@xxxxxxxxxx>]

Hi. I have Linux 4.9.0-8-amd64 #1 SMP Debian 4.9.130-2 (2018-10-27) 
x86_64 GNU/Linux with xen-system-amd64 
4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10. Debian itself boots fine but, 
xen dom0 boot fails with - megaraid_sas Failed from 
megasas_alloc_request_fusion. Gave up waiting for root file system - 
Fails on Dell R7425 with raid 1 ssd   PERC H740P Adapter. I have this 
same Debian & Xen configuration running happily on a Dell R530 ssd raid 
1 PERC H730 raid controller. Can someone help to guide me to debug and 
capture information to determine the issue? Thanks.
After suggestions from the #debian-xen irc I made changes to increase 
dom0 memory with the following outcomes :-
Increase from 1G to 4G > exactly the same error

Increase to 8G and increase cpus from 1 to 4 the error changes :-  
[Firmware Bug ]: cpu 0 try to use APIC520 for vector 0xf4 but the 
register is already in use for vector 0x0 on this cpu. Similar for cpu 1 
, ending up with Gave up waiting for root file system.
GRUB_CMDLINE_XEN="'dom0_mem=8192M,max:8192M'  dom0_max_vcpus=4 
dom0_vcpus_pin"
originally

GRUB_CMDLINE_XEN="'dom0_mem=1024M,max:1024M'  dom0_max_vcpus=1 
dom0_vcpus_pin"
Thanks.

--
Paul Dunda | Principal
Open Business Technology
mob. +61 418 967 719
https://obt.net.au


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