From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ross Lagerwall <ross.lagerwall@citrix.com>
Subject: Re: [PATCH v3 08/23] x86/xen_hello_world.xsplice: Test
 payload for patching 'xen_extra_version'. (v2)
Date: Tue, 16 Feb 2016 11:31:50 +0000
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References: <1455300361-13092-1-git-send-email-konrad.wilk@oracle.com>
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To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Wei Liu <wei.liu2@citrix.com>, Ian Campbell <ian.campbell@citrix.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, jinsong.liu@alibaba-inc.com, Ian Jackson <ian.jackson@eu.citrix.com>, mpohlack@amazon.de, Stefano Stabellini <stefano.stabellini@citrix.com>, Jan Beulich <jbeulich@suse.com>, andrew.cooper3@citrix.com, xen-devel@lists.xenproject.org, Keir Fraser <keir@xen.org>, sasha.levin@citrix.com
List-Id: xen-devel@lists.xenproject.org

On 02/12/2016 06:05 PM, Konrad Rzeszutek Wilk wrote:
> This change demonstrates how to generate an xSplice ELF payload.
>
> The idea here is that we want to patch in the hypervisor
> the 'xen_version_extra' function with an function that will
> return 'Hello World'. The 'xl info | grep extraversion'
> will reflect the new value after the patching.
>
> To generate this ELF payload file we need:
>   - C code of the new code (xen_hello_world_func.c).
>   - C code generating the .xsplice.funcs structure
>     (xen_hello_world.c)
>   - The address of the old code (xen_extra_version). We
>     retrieve it by  using 'nm --defined' on xen-syms.
>   - The size of the new and old code for which we use
>     nm --defined -S on our code and xen-syms respectively.
>
snip
> diff --git a/tools/misc/xsplice.lds b/tools/misc/xsplice.lds
> new file mode 100644
> index 0000000..f52eb8c
> --- /dev/null
> +++ b/tools/misc/xsplice.lds
> @@ -0,0 +1,11 @@
> +OUTPUT_FORMAT("elf64-x86-64", "elf64-x86-64", "elf64-x86-64")
> +OUTPUT_ARCH(i386:x86-64)
> +ENTRY(xsplice_hello_world)
> +SECTIONS
> +{
> +    /* The hypervisor expects ".xsplice.func", so change
> +     * the ".data.xsplice_hello_world" to it. */
> +
> +    .xsplice.funcs : { *(*.xsplice_hello_world) }
> +
> +}

I think this file can be dropped now, nothing uses it as far as I can see.

-- 
Ross Lagerwall