Re: zstd compressed kernels

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 17/11/2020 20:27, Michael Young wrote:
> Is anyone else looking at vmlinuz files which use zstd compression?
> Fedora has started doing so with its 5.9 kernels.

Well volunteered ;)

Yes - I'm aware that it is an area needing working on, but it is not
sufficiently urgent on my TODO stack to look at yet.

There are other compression schemes supported by Linux which aren't
supported by us, either.  I was planning to go through all of them and
check them all.


If you're willing to have a go:

For dom0 support, port Linux's decompressor into xen/common/ and plumb
it into xen/common/decompress.c

For domU's, tools/libs/guest/xg_dom_bzimageloader.c and
xc_dom_probe_bzimage_kernel()

(Wow this plumbing is ugly and in need of some rationalisation...)

~Andrew