On Tue, Dec 01, 2020 at 03:22:37PM -0500, Jagannathan Raman wrote:
> From: Elena Ufimtseva <elena.ufimts...@oracle.com>
>
> Adds documentation explaining the command-line arguments needed
> to use multi-process. Also adds a python script that illustrates the
> usage.
>
> Signed-off-by: Elena Ufimtseva <elena.ufimts...@oracle.com>
> Signed-off-by: Jagannathan Raman <jag.ra...@oracle.com>
> Signed-off-by: John G Johnson <john.g.john...@oracle.com>
> Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
> ---
> docs/multi-process.rst | 66 +++++++++++++++++++
> MAINTAINERS | 1 +
> tests/multiprocess/multiprocess-lsi53c895a.py | 92
> +++++++++++++++++++++++++++
> 3 files changed, 159 insertions(+)
> create mode 100644 docs/multi-process.rst
> create mode 100755 tests/multiprocess/multiprocess-lsi53c895a.py
> diff --git a/tests/multiprocess/multiprocess-lsi53c895a.py
> b/tests/multiprocess/multiprocess-lsi53c895a.py
> new file mode 100755
> index 0000000..bfe4f66
> --- /dev/null
> +++ b/tests/multiprocess/multiprocess-lsi53c895a.py
> @@ -0,0 +1,92 @@
> +#!/usr/bin/env python3
> +
> +import urllib.request
> +import subprocess
> +import argparse
> +import socket
> +import sys
> +import os
> +
> +arch = os.uname()[4]
> +proc_path = os.path.join(os.getcwd(), '..', '..', 'build', arch+'-softmmu',
> + 'qemu-system-'+arch)
> +
> +parser = argparse.ArgumentParser(description='Launcher for multi-process
> QEMU')
> +parser.add_argument('--bin', required=False, help='location of QEMU binary',
> + metavar='bin');
> +args = parser.parse_args()
> +
> +if args.bin is not None:
> + proc_path = args.bin
> +
> +if not os.path.isfile(proc_path):
> + sys.exit('QEMU binary not found')
> +
> +kernel_path = os.path.join(os.getcwd(), 'vmlinuz')
> +initrd_path = os.path.join(os.getcwd(), 'initrd')
> +
> +proxy_cmd = [ proc_path, \
> + '-name', 'Fedora', '-smp', '4', '-m', '2048', '-cpu', 'host', \
I wonder if setting 2 GB of RAM is too large for something that runs by
default as a test.
> + '-object', 'memory-backend-memfd,id=sysmem-file,size=2G', \
> + '-numa', 'node,memdev=sysmem-file', \
> + '-kernel', kernel_path, '-initrd', initrd_path, \
> + '-vnc', ':0', \
> + '-monitor', 'unix:/home/qemu-sock,server,nowait', \
> + ]
> +
> +if arch == 'x86_64':
> + print('Downloading images for arch x86_64')
> + kernel_url = 'https://dl.fedoraproject.org/pub/fedora/linux/' \
> + 'releases/33/Everything/x86_64/os/images/' \
> + 'pxeboot/vmlinuz'
> + initrd_url = 'https://dl.fedoraproject.org/pub/fedora/linux/' \
> + 'releases/33/Everything/x86_64/os/images/' \
> + 'pxeboot/initrd.img'
> + proxy_cmd.append('-machine')
> + proxy_cmd.append('pc,accel=kvm')
> + proxy_cmd.append('-append')
> + proxy_cmd.append('rdinit=/bin/bash console=ttyS0 console=tty0')
> +elif arch == 'aarch64':
> + print('Downloading images for arch aarch64')
> + kernel_url = 'https://dl.fedoraproject.org/pub/fedora/linux/' \
> + 'releases/33/Everything/aarch64/os/images/' \
> + 'pxeboot/vmlinuz'
> + initrd_url = 'https://dl.fedoraproject.org/pub/fedora/linux/' \
> + 'releases/33/Everything/aarch64/os/images/' \
> + 'pxeboot/initrd.img'
> + proxy_cmd.append('-machine')
> + proxy_cmd.append('virt,gic-version=3')
> + proxy_cmd.append('-accel')
> + proxy_cmd.append('kvm')
> + proxy_cmd.append('-append')
> + proxy_cmd.append('rdinit=/bin/bash')
> +else:
> + sys.exit('Arch %s not tested' % arch)
It doens't look like you really need a full OS here. Rather than
downloading the fairly large Fedora images, I'd suggest just using
the kernel that exists on the host OS already in /boot, and then
building a tiny initrd that contains just a static linked busybox.
I have this helper script that could be imported into QEMU for
this purpose:
https://gitlab.com/berrange/tiny-vm-tools/-/blob/master/make-tiny-image.py
And just skip the test if busybox doesn't exist, or if the vmlinux
in /boot isn't accessible (Debian restricts it to root only IIRC)
> +
> +urllib.request.urlretrieve(kernel_url, kernel_path)
> +urllib.request.urlretrieve(initrd_url, initrd_path)
> +
> +proxy, remote = socket.socketpair(socket.AF_UNIX, socket.SOCK_STREAM)
> +
> +proxy_cmd.append('-device')
> +proxy_cmd.append('x-pci-proxy-dev,id=lsi1,fd='+str(proxy.fileno()))
> +
> +remote_cmd = [ proc_path,
> \
> + '-machine', 'x-remote',
> \
> + '-device', 'lsi53c895a,id=lsi1',
> \
> + '-object',
> \
> +
> 'x-remote-object,id=robj1,devid=lsi1,fd='+str(remote.fileno()), \
> + '-display', 'none',
> \
> + '-monitor', 'unix:/home/rem-sock,server,nowait',
> \
> + ]
> +
> +pid = os.fork();
> +
> +if pid:
> + # In Proxy
> + print('Launching QEMU with Proxy object');
> + process = subprocess.Popen(proxy_cmd, pass_fds=[proxy.fileno()])
> +else:
> + # In remote
> + print('Launching Remote process');
> + process = subprocess.Popen(remote_cmd, pass_fds=[remote.fileno(), 0, 1,
> 2])
Regards,
Daniel
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