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Julien Grall
c085c4eac8
With livepatch the alternatives that should be patched are outside of the Xen hypervisor _start -> _end. The current code is assuming that only Xen could be patched and therefore will explode when a payload contains alternatives. Given that alt_instr contains a relative offset, the function __apply_alternatives could directly take in parameter the virtual address of the alt_instr set of the re-mapped region. So we can mandate the callers of __apply_alternatives to provide use with a region that has read-write access. The only caller that will patch directly the Xen binary is the function __apply_alternatives_multi_stop. The other caller apply_alternatives will work on the payload which will still have read-write access at that time. Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Julien Grall <julien.grall@arm.com>