[FS#908] x86: Xen support broken in 17.01.2 and later

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Baptiste Jonglez (bjonglez) 

Attached to Project - LEDE Project
Summary - x86: Xen support broken in 17.01.2 and later
Task Type - Bug Report
Category - Kernel
Status - Researching
Assigned To - 
Operating System - All
Severity - Low
Priority - Medium
Reported Version - lede-17.01
Due in Version - Undecided
Due Date - Undecided
Details - Testing the x86/generic image with Xen 4.5:

  * 17.01.0: works
  * 17.01.1: works
  * 17.01.2: fails to boot
  * latest lede-17.01 r3466-f6907dcc79: fails to boot
  * latest trunk r4553-a89c36b: works

When the kernel fails to boot, xl prints this:

xc: error: elf_xen_note_check: ERROR: Will only load images built for the generic loader or Linux images (Not '' and ''): Invalid kernel
libxl: error: libxl_dom.c:414:libxl__build_pv: xc_dom_parse_image failed: No such file or directory
libxl: error: libxl_create.c:1024:domcreate_rebuild_done: cannot (re-)build domain: -3


It means that the kernel image has no Xen support (or there is an issue with the support).

Given the changes between 17.01.1 and 17.01.2, I think the patch adding PAE support may be responsible.

This was first reported in FS#787.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=908