Stefan Haberland e764f460c4 zipl: Do not strip kernel image IPL header ...

The binary Linux kernel image is built to be loaded to memory address
0x0 but the first 64 kbyte contain an IPL header that is not used for
disk IPL. zIPL strips away this IPL header when writing IPL records to
disk, loads the remaining data to memory address 0x10000 and uses the
memory area below that for its own boot loader code.

The Secure Boot firmware feature checks the integrity of an installed
image during IPL using a checksum that was generated for the full image.
Since the checksum becomes invalid if the IPL header is removed, zIPL
must be changed to write the full image to disk.

This patch modifies the zIPL logic to no longer strip away the IPL
header. Instead the full image is loaded to a higher memory address and
relocated by the stage 3 boot loader code to its final location.

Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

2019-04-29 17:17:16 +02:00

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