Re: [Xen-devel] Problem creating x86_64 PVH mini-os domain

[Bruno Alvisio <bruno.alvisio@xxxxxxxxx>]

On Sun, Dec 31, 2017 at 5:12 PM, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:

On 31/12/2017 15:19, Bruno Alvisio wrote:

Hi all,

 

I was trying to create mini-os PVH instances both x86_32 and x86_64. I have no issue with x86_32 but when trying to ‘xl create’ x86_64 type I get the following error:

<snip>

xc: error: panic: xc_dom_hvmloader.c:113: xc_dom_parse_hvm_kernel: ELF image is not 32bit: Invalid kernel

The domain loader only ever accepts elf32 images, because the starting state is 32bit flat mode.

This is how XTF deals with the problem:

http://xenbits.xen.org/gitweb/?p=xtf.git;a=blob;f=build/gen.mk;h=8d7a6bf89725fedc8343d2e4d3c8e2c93c16811f;hb=HEAD#l47

There is a lot of template meta-programming in there, but basically after doing the final link, do a further objcopy to convert the image to elf32-x86-64 (if available), or elf32-i386.  The former is only available if you have an x32 toolchain, and allows the binary to load properly and disassemble correctly.

Thank you. Doing:

$objcopy <obj_file> -O elf32-x86-64 <new_obj_file>

 worked perfectly!

 Happy New Year!

Happy new year.

~Andrew

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