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From: Andy Smith <andy@strugglers.net>
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Subject: Re: Confusion regarding LZ4-compressed kernel support and Xen (PV)
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On Sat, Apr 25, 2020 at 11:38:51PM +0000, Andy Smith wrote:
> I see the error message comes from:
> 
> grub-core/loader/i386/xen_file.c
> 92:  grub_error (GRUB_ERR_BAD_OS, "not xen image");

Some further investigation reveals that if I boot these kernels with
the PVH image (./configure --target=x86_64 --with-platform=xen_pvh
…) then it does work.

I guess that will be the path of least resistance since I was
planning to switch everything to PVH mode anyway.

Cheers,
Andy