Re: [Xen-devel] [PATCH 3/3] Update README.md

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Fri, Jun 10, 2016 at 12:02:45PM +0100, Ross Lagerwall wrote:
> Update the example and project status. Add Contributing and Maintainers
> sections.

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> 
> Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
> ---
>  README.md | 76 
> ++++++++++++++++++++++++++++++++++++++++++++-------------------
>  1 file changed, 53 insertions(+), 23 deletions(-)
> 
> diff --git a/README.md b/README.md
> index 9fb709f..653c624 100644
> --- a/README.md
> +++ b/README.md
> @@ -2,27 +2,34 @@ livepatch-build
>  =============
>  
>  livepatch-build is a tool for building LivePatch patches from source code
> -patches.  It takes as input, a Xen tree and a patch and outputs an
> +patches.  It takes as input, a Xen tree and a patch and outputs a
>  `.livepatch` module containing containing the live patch.
>  
>  Quick start
>  -----------
>  First checkout the code, and then run `make` to build it.
>  
> -Here is an example of building a patch for XSA-106:
> +Here is an example of building a live patch for Xen for some XSA.
> +First build Xen, install it on a host somewhere and reboot:
> +```
> +$ cp -r ~/src/xen ~/src/xenbuild
> +$ cd ~/src/xen/xen
> +$ make nconfig # Make sure to set CONFIG_LIVEPATCH=y
> +$ make
> +$ BUILDID=$(readelf -Wn xen-syms | awk '/Build ID:/ {print $3}')
> +```
> +
> +Next, build a live patch, using a patch and the source, build ID, and
> +.config from the original build:
>  ```
> -$ cd ~/src/xen
> -$ git reset --hard
> -$ git clean -x -f -d
> -$ git checkout 346d4545569928b652c40c7815c1732676f8587c^
>  $ cd ~/src/livepatch-build
> -$ wget -q 'http://xenbits.xen.org/xsa/xsa106.patch'
> -$ ./livepatch-build --xen-debug -s ~/src/xen -p xsa106.patch -o out
> -Building LivePatch patch: xsa106
> +$ ./livepatch-build -s ~/src/xenbuild -p ~/src/xsa.patch -o out \
> +    -c ~/src/xen/xen/.config --depends $BUILDID
> +Building LivePatch patch: xsa
>  
> -Xen directory: /home/ross/src/xen
> -Patch file: /home/ross/src/livepatch-build/xsa106.patch
> -Output directory: /home/ross/src/livepatch-build/out
> +Xen directory: /home/ross/src/xenbuild
> +Patch file: /home/ross/src/xsa.patch
> +Output directory: /home/ross/src/livepatch-build-tools/out
>  ================================================
>  
>  Testing patch file...
> @@ -32,22 +39,45 @@ Unapply patch and build with 4 CPU(s)...
>  Extracting new and modified ELF sections...
>  Processing xen/arch/x86/x86_emulate.o
>  Creating patch module...
> -xsa106.livepatch created successfully
> +xsa.livepatch created successfully
>  
> -$ ls -lh out/xsa106.livepatch
> --rw-rw-r--. 1 ross ross 418K Oct 12 12:02 out/xsa106.livepatch
> +$ ls -lh out/xsa.livepatch
> +-rwxrwxr-x. 1 ross ross 135K Jun 10 09:32 out/xsa.livepatch
> +```
> +
> +Finally, copy the live patch to the host and load it:
> +```
> +$ scp out/xsa.livepatch myhost:
> +$ ssh myhost 'xen-livepatch load xsa.livepatch'
> +Uploading xsa.livepatch (135840 bytes)
> +Performing apply:. completed
> +$ ssh myhost 'xen-livepatch list'
> + ID                                     | status
> +----------------------------------------+------------
> +xsa                                     | APPLIED
>  ```
>  
>  Project Status
>  --------------
> -This is prototype code:
> - * There's no way to apply built patches
> - * Patches cannot be built for some source patches
> - * The output format does not correspond to the latest LivePatch design
> -
> -With no source patch modifications, live patches can be built for every
> -XSA that applies to x86 back to XSA-90 except for XSA-97, XSA-111,
> -XSA-112, and XSA-114 (83% success rate).
> +Live patches can be built and applied for many changes, including most
> +XSAs; however, there are still some cases which require changing the
> +source patch to allow it to be built as a live patch.
> +
> +This tool currently supports x86 only.
> +
> +It is intended that some or all of this project will merge back into
> +kpatch-build rather being maintained as a fork.
> +
> +Contributing
> +------------
> +Please send patches created with `git-format-patch` and an appropriate
> +Signed-off-by: line to <xen-devel@xxxxxxxxxxxxx>, CCing the maintainers
> +listed below.
> +
> +Maintainers
> +-----------
> +* Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
> +* Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
>  
>  License
>  -------
> -- 
> 2.4.11
> 

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