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docs/Developer-Guide: Add instructions to apply QEMU patches

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Occasionally patches are necessary to build QEMU with the kata containers
configuration. This changed the developer guide to make it clear it is
recommended to apply the patches; and tell how.

Fixes #1807
Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
This commit is contained in:
Wainer dos Santos Moschetta 2021-05-11 10:28:35 -04:00
parent bffb099d99
commit e24e94622c
1 changed files with 16 additions and 4 deletions
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docs/Developer-Guide.md
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@ -393,14 +393,26 @@ You may choose to manually build your VMM/hypervisor.
Kata Containers makes use of upstream QEMU branch. The exact version Kata Containers makes use of upstream QEMU branch. The exact version
and repository utilized can be found by looking at the [versions file](../versions.yaml). and repository utilized can be found by looking at the [versions file](../versions.yaml).
Kata often utilizes patches for not-yet-upstream fixes for components, There are scripts to manage the build and packaging of QEMU. For the examples below, set your
including QEMU. These can be found in the [packaging/QEMU directory](../tools/packaging/qemu/patches) environment as:
```
$ go get -d github.com/kata-containers/kata-containers
$ packaging_dir="${GOPATH}/src/github.com/kata-containers/kata-containers/tools/packaging"
```
Kata often utilizes patches for not-yet-upstream and/or backported fixes for components,
including QEMU. These can be found in the [packaging/QEMU directory](../tools/packaging/qemu/patches),
and it's *recommended* that you apply them. For example, suppose that you are going to build QEMU
version 5.2.0, do:
```
$ cd $your_qemu_directory
$ $packaging_dir/scripts/apply_patches.sh $packaging_dir/qemu/patches/5.2.x/
```
To build utilizing the same options as Kata, you should make use of the `configure-hypervisor.sh` script. For example: To build utilizing the same options as Kata, you should make use of the `configure-hypervisor.sh` script. For example:
``` ```
$ go get -d github.com/kata-containers/kata-containers/tools/packaging
$ cd $your_qemu_directory $ cd $your_qemu_directory
$ ${GOPATH}/src/github.com/kata-containers/kata-containers/tools/packaging/scripts/configure-hypervisor.sh kata-qemu > kata.cfg $ $packaging_dir/scripts/configure-hypervisor.sh kata-qemu > kata.cfg
$ eval ./configure "$(cat kata.cfg)" $ eval ./configure "$(cat kata.cfg)"
$ make -j $(nproc) $ make -j $(nproc)
$ sudo -E make install $ sudo -E make install