Hi Guenter,

Thanks a lot for the heads up.

On 2021-01-29 21:43, Guenter Roeck wrote:

Hi,

On Tue, Jan 05, 2021 at 06:05:37PM +0000, David Brazdil wrote:

quoted

Add a post-processing step to compilation of KVM nVHE hyp code which
calls a custom host tool (gen-hyprel) on the partially linked object
file (hyp sections' names prefixed).

The tool lists all R_AARCH64_ABS64 data relocations targeting hyp
sections and generates an assembly file that will form a new section
.hyp.reloc in the kernel binary. The new section contains an array of
32-bit offsets to the positions targeted by these relocations.

Since these addresses of those positions will not be determined until
linking of `vmlinux`, each 32-bit entry carries a R_AARCH64_PREL32
relocation with addend <section_base_sym> + <r_offset>. The linker of
`vmlinux` will therefore fill the slot accordingly.

This relocation data will be used at runtime to convert the kernel VAs
at those positions to hyp VAs.

Signed-off-by: David Brazdil <redacted>

This patch results in the following error for me.

error: arch/arm64/kvm/hyp/nvhe/kvm_nvhe.tmp.o: assertion
elf.ehdr->e_ident[5] == 1 failed (lhs=2, rhs=1, line=250)

The problem is seen when trying to build aarch64 images in big endian
mode.

Ah, big-endian. of course, the ELF header is in native endianness,
and the sanity checks explode (still much better than generating crap).

I'll have a look shortly. It shouldn't too hard to fix, just a
bit invasive...

Thanks again,

         M.
-- 
Jazz is not dead. It just smells funny...

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