Please add documenation for updating QEMU binaries

[mooseword]

I would like to help out by making PRs for keep the QEMU binaries up to date. I have been trying to no avail to build QEMU on a macOS M1 machine. Could someone help me fill out the steps to provide a guide for contributors?

Here is what I have been trying:

0. clone the qemu project
1. Download the diff provided by Alex. For example, viewing [v8,19/19] hvf: arm: Handle Windows 10 SMC call , and clicking the 'series' button to download diff
2. apply the patch to qemu repo

cd /path/to/qemu/
git apply hvf-Implement-Apple-Silicon-Support.patch

3. build qemu
4. copy the build products to ACVM repo

cd /path/to/build/folder # right-click Products in Xcode-> Reveal in finder
cp qemu-system-aarch64 /path/to/ACVM/ACVM
cp qemu-img /path/to/ACVM/ACVM

However, I have not been able to build QEMU. I must admit this is may be due to me trying to avoid using Homebrew to install the additional build requirements. I have been able to compile everything myself except for glib. But if Homebrew is what it takes, then I will go for it.

The error I always hit when trying to build glib is when it tries to use its own libffi subproject itself, instead of using the libffi I built:

In file included from ../subprojects/libffi/src/aarch64/ffi.c:26:
subprojects/libffi/include/ffi.h:14:10: fatal error: 'ffi-aarch64.h' file not found
#include "ffi-aarch64.h"

[mooseword]

Ok I have made progress, mostly thanks to upgrading to Python 3.9.6. If I make more progress, I will work on putting this together in a nicer way.

Building Embedded Binaries

Checking you can apply the patch

git clone https://gitlab.com/qemu-project/qemu.git

Look at the dates or SHAs for the patch you are trying to apply. The patches being the latest patch from alex . In my case this was May 19th, 2021.

git log --after="2021-05-18" --until="2021-05-20"

In my case, I went with 0a6f0c7

git checkout -b myPatchyBranchy
git reset --hard 0a6f0c7
git apply /path/to/your-Apple-Silicon-Support.patch

Building QEMU

Official docs

Dependencies

macOS ? (tested on 11.4 (20F71))

Python 3.9.6

Building glib will fail as previous versions of python report uname as x86_64

3.9.1

Python 3.9.1 (v3.9.1:1e5d33e9b9, Dec  7 2020, 12:10:52) 
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.uname().machine
'x86_64'

3.9.6

Python 3.9.6 (v3.9.6:db3ff76da1, Jun 28 2021, 11:14:58) 
[Clang 12.0.5 (clang-1205.0.22.9)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.uname().machine
'arm64'

Setup

The combination of the following versions of libraries has been built, but not tested. These should also be built in this order.

• gettext-0.21 releases | download
• autoconf-2.69 releases | download # note that 2.71 doesn't work with latest automake below
• automake-1.16.3 releases | download
• pkg-config-0.29.2 releases | download
• libffi-3.4.2 releases | download
• pixman-0.40.0 releases | download
• glib-2.69.0 releases | download

additionally, ninja, which we will copy the executable to our bin

I used a custom directory for building out the dependencies, which may not be valid.

export $BDIR=/tmp/qemuBuildDepends

---

For each of the dependencies listed above (except glib), cd into their directory and run

PATH=$BDIR/bin:$PATH ./configure --prefix=$BDIR
make
make install

a. for pkg-config, add --with-internal-glib --disable-asm-optimizations to the ./configure command
b. for glib

cp your/ninja/executable $BDIR/bin
PATH=$BDIR/bin:$PATH meson _build --prefix=$BDIR
PATH=$BDIR/bin:$PATH ninja -C _build
PATH=$BDIR/bin:$PATH ninja -C _build install

Notes:
gettext takes the longest to build, at a minute or more. all others should be seconds.

cd qemu
PATH=$BDIR/bin:$PATH ./configure --prefix=$BDIR
make

ACVFM

cp qemuRepo/build/qemu-img acvmRepo/ACVM
cp qemuRepo/build/qemu-system-aarch64 acvmRepo/ACVM