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powerpc/prom_init: Undo relocation before entering secure mode

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The ultravisor will do an integrity check of the kernel image but we
relocated it so the check will fail. Restore the original image by
relocating it back to the kernel virtual base address.

This works because during build vmlinux is linked with an expected
virtual runtime address of KERNELBASE.

Fixes: 6a9c930bd7 ("powerpc/prom_init: Add the ESM call to prom_init")
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Tested-by: Michael Anderson <andmike@linux.ibm.com>
[mpe: Add IS_ENABLED() to fix the CONFIG_RELOCATABLE=n build]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190911163433.12822-1-bauerman@linux.ibm.com
This commit is contained in:
Thiago Jung Bauermann
2019-09-11 13:34:33 -03:00
committed by Michael Ellerman
parent a8a30219ba
commit 05d9a95283
3 changed files with 18 additions and 1 deletions
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3
arch/powerpc/include/asm/elf.h
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@@ -175,4 +175,7 @@ do { \
ARCH_DLINFO_CACHE_GEOMETRY; \
} while (0)
/* Relocate the kernel image to @final_address */
void relocate(unsigned long final_address);
#endif /* _ASM_POWERPC_ELF_H */