[PATCH] kexec: don't use kexec_file_load on XEN

[Simon Horman]

On Tue, Jan 16, 2024 at 06:14:31PM +0100, Jiri Bohac wrote:
> Since commit 29fe5067ed07 ("kexec: make -a the default")
> kexec tries the kexec_file_load syscall first and only falls back to kexec_load on
> selected error codes.
> 
> This effectively breaks kexec on XEN, unless -c is pecified to force the kexec_load
> syscall.
> 
> The XEN-specific functions (xen_kexec_load / xen_kexec_unload) are only called
> from my_load / k_unload, i.e. the kexec_load code path.
> 
> With -p (panic kernel) kexec_file_load on XEN fails with -EADDRNOTAVAIL (crash
> kernel reservation is ignored by the kernel on XEN), which is not in the list
> of return codes that cause the fallback to kexec_file.
> 
> Without -p kexec_file_load actualy leads to a kernel oops on v6.4.0
> (needs to be dubugged separately).
> 
> Signed-off-by: Jiri Bohac <jbohac at suse.cz>
> Fixes: 29fe5067ed07 ("kexec: make -a the default")

Thanks Jiri,

and sorry for the delay.
Applied to main.