[PATCH v7 00/13] vhost-user: support any POSIX system (tested on macOS, FreeBSD, OpenBSD)

Stefano Garzarella posted 13 patches 1 month ago
Only 0 patches received!
There is a newer version of this series
docs/system/devices/vhost-user.rst        |   5 +-
meson.build                               |   5 +-
qapi/qom.json                             |  28 ++++-
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, 315 insertions(+), 33 deletions(-)
create mode 100644 backends/hostmem-shm.c
[PATCH v7 00/13] vhost-user: support any POSIX system (tested on macOS, FreeBSD, OpenBSD)
Posted by Stefano Garzarella 1 month ago
This series should be in a good shape, in which tree should we queue it?
@Micheal would your tree be okay?

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:
- rebased on https://patchew.org/QEMU/20240611130231.83152-1-sgarzare@redhat.com/
  That patch is queued by Markus and only Patch 10 of this series depends on it.
- changed default value documentation for @share [Markus]
- used `memory-backend-shm` instead of `shm` and wrapped to 70 columns
  [Markus]
- added 'if': 'CONFIG_POSIX' to MemoryBackendShmProperties [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

Based-on: 20240611130231.83152-1-sgarzare@redhat.com

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                             |  28 ++++-
 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, 315 insertions(+), 33 deletions(-)
 create mode 100644 backends/hostmem-shm.c


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-- 
2.45.2
Re: [PATCH v7 00/13] vhost-user: support any POSIX system (tested on macOS, FreeBSD, OpenBSD)
Posted by Stefano Garzarella 1 month ago
Ooops, wrong cover letter. I just resent the whole series.

Sorry for the confusion.
Stefano

On Wed, Jun 12, 2024 at 2:59 PM Stefano Garzarella <sgarzare@redhat.com> wrote:
>
> This series should be in a good shape, in which tree should we queue it?
> @Micheal would your tree be okay?
>
> 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:
> - rebased on https://patchew.org/QEMU/20240611130231.83152-1-sgarzare@redhat.com/
>   That patch is queued by Markus and only Patch 10 of this series depends on it.
> - changed default value documentation for @share [Markus]
> - used `memory-backend-shm` instead of `shm` and wrapped to 70 columns
>   [Markus]
> - added 'if': 'CONFIG_POSIX' to MemoryBackendShmProperties [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
>
> Based-on: 20240611130231.83152-1-sgarzare@redhat.com
>
> 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                             |  28 ++++-
>  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, 315 insertions(+), 33 deletions(-)
>  create mode 100644 backends/hostmem-shm.c
>
>
> base-commit: 60b54b67c63d8f076152e0f7dccf39854dfc6a77
> prerequisite-patch-id: 9a9fc9901c4fffc060dbc8a5cfe421ab592afb5a
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> prerequisite-patch-id: 92e5fe246b5aee161ab4d59169e03f453005c0bc
> --
> 2.45.2
>