linux-kernel - Re: [PATCH] powerpc/prom_init: Undo relocation before entering secure mode

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Message-ID: <875zly1jbo.fsf@morokweng.localdomain>
Date:   Wed, 11 Sep 2019 20:53:15 -0300
From:   Thiago Jung Bauermann <bauerman@...ux.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     Mike Anderson <andmike@...ux.ibm.com>,
        Ram Pai <linuxram@...ibm.com>, linux-kernel@...r.kernel.org,
        Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH] powerpc/prom_init: Undo relocation before entering secure mode


Thiago Jung Bauermann <bauerman@...ux.ibm.com> writes:

> 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: 6a9c930bd775 ("powerpc/prom_init: Add the ESM call to prom_init")
> Signed-off-by: Thiago Jung Bauermann <bauerman@...ux.ibm.com>

I meant to put a Suggested-by: Paul Mackerras <paulus@...ba.org>

Sorry. Will add it if there's a v2.

-- 
Thiago Jung Bauermann
IBM Linux Technology Center