On 03/30/2016 04:47 PM, Michael Ellerman wrote:
On Wed, 2016-03-30 at 13:14 +0530, Hari Bathini wrote:
Alternatively, how about moving the OOLs handlers that can't be branched with
LOAD_HANDLER under __end_interrupts. This way we won't be copying more than a
few absolutely needed handlers.
STD_RELON_EXCEPTION_HV_OOL(0xe40, emulation_assist)
.
.
STD_RELON_EXCEPTION_HV_OOL(0xf80, hv_facility_unavailable)
We can leave __end_handlers marker to indicate code that should be part
of the first 64K of kernel image.
That might work. But I suspect you will run into issues with ".org backwards",
ie. running out of space in head_64.S
But try it and let me know if it works.
It worked. Doing some sanity testing.
Will post v3 soon with this approach.
I think we also need to write a script or little C program which looks at the
vmlinux and checks that nothing below __end_whatever does a direct branch. So
that we don't break it again in future.
Yep. That would make life easy..
Let me see if I can do something about it.
Thanks
Hari
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