Re: [PATCH v8 00/13] vhost-user: support any POSIX system (tested on macOS, FreeBSD, OpenBSD)

[Michael S. Tsirkin]

On Tue, Jun 18, 2024 at 12:00:30PM +0200, Stefano Garzarella wrote:
> As discussed with Michael and Markus [1], this version also includes the patch
> on which v7 depended to simplify the merge in Michael's tree.
> 
> The series is all reviewed, so if there are no new changes required, I would
> ask to merge it.


I dropped patches 9 and 10 for now since otherwise make vm-build-freebsd
fails.

Pls figure it out and resend just 9 and 10.


> [1] 
> https://patchew.org/QEMU/20240612130140.63004-1-sgarzare@redhat.com/#vabzv4z6g3dd5yndvpmwktcfgbqrdg7qk2e5se6zuflrhss723@dws4vrzen6cs
> 
> Thanks,
> Stefano
> 
> Changelog
> 
> v1: https://patchew.org/QEMU/20240228114759.44758-1-sgarzare@redhat.com/
> v2: https://patchew.org/QEMU/20240326133936.125332-1-sgarzare@redhat.com/
> v3: https://patchew.org/QEMU/20240404122330.92710-1-sgarzare@redhat.com/
> v4: https://patchew.org/QEMU/20240508074457.12367-1-sgarzare@redhat.com/
> v5: https://patchew.org/QEMU/20240523145522.313012-1-sgarzare@redhat.com/
> v6: https://patchew.org/QEMU/20240528103543.145412-1-sgarzare@redhat.com/
> v7: https://patchew.org/QEMU/20240612130140.63004-1-sgarzare@redhat.com/
> v8:
> - Included the dependent patch in this series
>   https://patchew.org/QEMU/20240611130231.83152-1-sgarzare@redhat.com/
> - Fixed QAPI documentation about share option [Markus]
> 
> Description
> 
> The vhost-user protocol is not really Linux-specific, so let's try support
> QEMU's frontends and backends (including libvhost-user) in any POSIX system
> with this series. The main use case is to be able to use virtio devices that
> we don't have built-in in QEMU (e.g. virtiofsd, vhost-user-vsock, etc.) even
> in non-Linux systems.
> 
> The first 5 patches are more like fixes discovered at runtime on macOS or
> FreeBSD that could go even independently of this series.
> 
> Patches 6, 7, 8, 9 enable building of frontends and backends (including
> libvhost-user) with associated code changes to succeed in compilation.
> 
> Patch 10 adds `memory-backend-shm` that uses the POSIX shm_open() API to
> create shared memory which is identified by an fd that can be shared with
> vhost-user backends. This is useful on those systems (like macOS) where
> we don't have memfd_create() or special filesystems like "/dev/shm".
> 
> Patches 11 and 12 use `memory-backend-shm` in some vhost-user tests.
> 
> Maybe the first 5 patches can go separately, but I only discovered those
> problems after testing patches 6 - 9, so I have included them in this series
> for now. Please let me know if you prefer that I send them separately.
> 
> I tested this series using vhost-user-blk and QSD on macOS Sonoma 14.4
> (aarch64), FreeBSD 14 (x86_64), OpenBSD 7.4 (x86_64), and Fedora 40 (x86_64)
> in this way:
> 
> - Start vhost-user-blk or QSD (same commands for all systems)
> 
>   vhost-user-blk -s /tmp/vhost.socket \
>     -b Fedora-Cloud-Base-39-1.5.x86_64.raw
> 
>   qemu-storage-daemon \
>     --blockdev 
> file,filename=Fedora-Cloud-Base-39-1.5.x86_64.qcow2,node-name=file \
>     --blockdev qcow2,file=file,node-name=qcow2 \
>     --export 
> vhost-user-blk,addr.type=unix,addr.path=/tmp/vhost.socket,id=vub,num-queues=1,node-name=qcow2,writable=on
> 
> - macOS (aarch64): start QEMU (using hvf accelerator)
> 
>   qemu-system-aarch64 -smp 2 -cpu host -M virt,accel=hvf,memory-backend=mem \
>     -drive 
> file=./build/pc-bios/edk2-aarch64-code.fd,if=pflash,format=raw,readonly=on \
>     -device virtio-net-device,netdev=net0 -netdev user,id=net0 \
>     -device ramfb -device usb-ehci -device usb-kbd \
>     -object memory-backend-shm,id=mem,size=512M \
>     -device vhost-user-blk-pci,num-queues=1,disable-legacy=on,chardev=char0 \
>     -chardev socket,id=char0,path=/tmp/vhost.socket
> 
> - FreeBSD/OpenBSD (x86_64): start QEMU (no accelerators available)
> 
>   qemu-system-x86_64 -smp 2 -M q35,memory-backend=mem \
>     -object memory-backend-shm,id=mem,size="512M" \
>     -device vhost-user-blk-pci,num-queues=1,chardev=char0 \
>     -chardev socket,id=char0,path=/tmp/vhost.socket
> 
> - Fedora (x86_64): start QEMU (using kvm accelerator)
> 
>   qemu-system-x86_64 -smp 2 -M q35,accel=kvm,memory-backend=mem \
>     -object memory-backend-shm,size="512M" \
>     -device vhost-user-blk-pci,num-queues=1,chardev=char0 \
>     -chardev socket,id=char0,path=/tmp/vhost.socket
> 
> Branch pushed (and CI started) at 
> https://gitlab.com/sgarzarella/qemu/-/tree/macos-vhost-user?ref_type=heads
> 
> Stefano Garzarella (13):
>   qapi: clarify that the default is backend dependent
>   libvhost-user: set msg.msg_control to NULL when it is empty
>   libvhost-user: fail vu_message_write() if sendmsg() is failing
>   libvhost-user: mask F_INFLIGHT_SHMFD if memfd is not supported
>   vhost-user-server: do not set memory fd non-blocking
>   contrib/vhost-user-blk: fix bind() using the right size of the address
>   contrib/vhost-user-*: use QEMU bswap helper functions
>   vhost-user: enable frontends on any POSIX system
>   libvhost-user: enable it on any POSIX system
>   contrib/vhost-user-blk: enable it on any POSIX system
>   hostmem: add a new memory backend based on POSIX shm_open()
>   tests/qtest/vhost-user-blk-test: use memory-backend-shm
>   tests/qtest/vhost-user-test: add a test case for memory-backend-shm
> 
>  docs/system/devices/vhost-user.rst        |   5 +-
>  meson.build                               |   5 +-
>  qapi/qom.json                             |  27 ++++-
>  subprojects/libvhost-user/libvhost-user.h |   2 +-
>  backends/hostmem-shm.c                    | 123 ++++++++++++++++++++++
>  contrib/vhost-user-blk/vhost-user-blk.c   |  27 +++--
>  contrib/vhost-user-input/main.c           |  16 +--
>  hw/net/vhost_net.c                        |   5 +
>  subprojects/libvhost-user/libvhost-user.c |  77 +++++++++++++-
>  tests/qtest/vhost-user-blk-test.c         |   2 +-
>  tests/qtest/vhost-user-test.c             |  23 ++++
>  util/vhost-user-server.c                  |  12 +++
>  backends/meson.build                      |   1 +
>  hw/block/Kconfig                          |   2 +-
>  qemu-options.hx                           |  16 +++
>  util/meson.build                          |   4 +-
>  16 files changed, 314 insertions(+), 33 deletions(-)
>  create mode 100644 backends/hostmem-shm.c
> 
> 
> base-commit: 60b54b67c63d8f076152e0f7dccf39854dfc6a77
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> prerequisite-patch-id: 4aeaca9916de80d6965cf8a4a2046ce838868b9e
> prerequisite-patch-id: d9e1e0e24aec960bd97fb6ea6090f96b279065ae
> prerequisite-patch-id: 962f178f4adb196263ac97e3e122c227ba8b4593
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> prerequisite-patch-id: 97614480e57fb4965d2d43bede127f74b7e163b5
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> prerequisite-patch-id: 6b6b67624ad3279fd1d5bfa85e5c629b19457a1a
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> prerequisite-patch-id: d1cab56c2c0f626b48fb27e8b3d0dfe23467274a
> prerequisite-patch-id: 4214a4e2601f4316614855d902c756469a975541
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> prerequisite-patch-id: 0207778851a2185aa1cb6add0789895e57a17e37
> prerequisite-patch-id: 31d9287af072dae499ba3615ac01ac1cb1850768
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> prerequisite-patch-id: 66f43dd746c8a4db3d1f63781f07e3f257e1b951
> prerequisite-patch-id: 66b530ac2d65b27ab400405a694b540232cb48b8
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> prerequisite-patch-id: d154abd788a30e1b8b20db08891ba6ed3a691589
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> prerequisite-patch-id: 97d9f6cfc40c030d657a62a4baee6ed3a5f771c9
> prerequisite-patch-id: f87f989cc7f612bad0191f5ce0ae742a1167b164
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> prerequisite-patch-id: a1276987d4d75a5882580baf3fb92bb80fdcdec6
> prerequisite-patch-id: f0b2e6091648632353e392fe8c3393e8902312b5
> prerequisite-patch-id: f3c3904a4ee5ffd7a7e7cd4543a9b59978d3370a
> prerequisite-patch-id: d2dc8ff5796218bfe77e2fd5e4d422fa7f13f2df
> prerequisite-patch-id: 15d1bf096a4efee76a07b2e0040afe1106ec6a8d
> prerequisite-patch-id: 28710fffbba300a706bdec231466be2488a22020
> prerequisite-patch-id: a9e960d9bdfeaa6725229b39540f9f12fae17696
> prerequisite-patch-id: 3d86a9343fc7c4cceba6a73e16d366e939801a18
> prerequisite-patch-id: 07b50455cb10229d4ad233bbecc5798388f062e6
> prerequisite-patch-id: 51fdff7f75da815c19684b3581367f80460849e4
> prerequisite-patch-id: c46f80c6ec7a86988d432c9185b8fa1fad266689
> prerequisite-patch-id: 886a1f50d9fd351364a7d72d125e7dad4403ed8e
> prerequisite-patch-id: b05ea374da004aa93a503e26bd06e79de358ca8a
> prerequisite-patch-id: cfdffb3ad12056811ec180cfdd375964e7c05f78
> prerequisite-patch-id: 4b945743feb00647979d295450500830bc510f16
> prerequisite-patch-id: 8c663bd7270ff7128a8ca9b9213956528eb9d795
> prerequisite-patch-id: 7c68984430bb09524c2347f5c5cf4db10ed0e11e
> prerequisite-patch-id: 00c5213959edfe39bd0889e8fdf9879bbb65cc9d
> prerequisite-patch-id: 28597d3ad923f6d64cbeee2e07e480ec4006f212
> prerequisite-patch-id: d5516a71154adccc271e449a1cfb4b857cbb0193
> prerequisite-patch-id: e682f00b2389e82ed5d507347ecc2c0fd12290dd
> prerequisite-patch-id: 3a3498ff58ff056d9a7df7efa08ff748838b398e
> -- 
> 2.45.2