I've attempted to get Xen to boot Arch Linux as a unified EFI binary. Using https://xenbits.xen.org/docs/unstable/misc/efi.html as my source of information, I've been able to build a unified binary. When trying to boot the kernel Xen complains that the stream is corrupt ("ZSTD-compressed data is corrupt"). I've been able to reproduce the issue locally in user-mode, and confirmed that the issue is also present in the latest ZSTD version.
Using streaming decompression the kernel gets unpacked properly and the output is the same as if doing `cat kernel.zst | unzstd > bzImage`. A problem I ran into was that adding book keeping to decompress.c would result in either a .data section being added or a .bss.* section. The linker would complain about this. And since I am not familiar with this code, and why it is this way, I opted to add a user-pointer to the internal decompression API. Rafaël Kooi (2): xen/decompress: Add a user pointer for book keeping in the callbacks x86/Dom0: Use streaming decompression for ZSTD compressed kernels xen/common/bunzip2.c | 23 ++++++++++++---------- xen/common/decompress.c | 37 ++++++++++++++++++++++++++++++------ xen/common/unlz4.c | 15 ++++++++------- xen/common/unlzma.c | 30 +++++++++++++++++------------ xen/common/unlzo.c | 13 +++++++------ xen/common/unxz.c | 11 ++++++----- xen/common/unzstd.c | 13 +++++++------ xen/include/xen/decompress.h | 10 +++++++--- 8 files changed, 97 insertions(+), 55 deletions(-) -- 2.40.0
