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[for-9.1,v3,00/11] vhost-user: support any POSIX system (tested on macOS, FreeBSD, OpenBSD)

Message ID 20240404122330.92710-1-sgarzare@redhat.com (mailing list archive)
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Series vhost-user: support any POSIX system (tested on macOS, FreeBSD, OpenBSD) | expand

Message

Stefano Garzarella April 4, 2024, 12:23 p.m. UTC
v1: https://patchew.org/QEMU/20240228114759.44758-1-sgarzare@redhat.com/
v2: https://patchew.org/QEMU/20240326133936.125332-1-sgarzare@redhat.com/
v3:
  - rebased on v9.0.0-rc2
  - patch 4: avoiding setting fd non-blocking for messages where we
    have memory fd (Eric)
  - patch 9: enriched commit message and documentation to highlight that we
    want to mimic memfd (David)

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, and 8 enable building of frontends and backends (including
libvhost-user) with associated code changes to succeed in compilation.

Patch 9 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 10 and 11 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 39 (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

Thanks,
Stefano

Stefano Garzarella (11):
  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
  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                             |  17 ++++
 subprojects/libvhost-user/libvhost-user.h |   2 +-
 backends/hostmem-shm.c                    | 118 ++++++++++++++++++++++
 contrib/vhost-user-blk/vhost-user-blk.c   |  23 ++++-
 hw/net/vhost_net.c                        |   5 +
 subprojects/libvhost-user/libvhost-user.c |  76 +++++++++++++-
 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                           |  11 ++
 util/meson.build                          |   4 +-
 15 files changed, 288 insertions(+), 18 deletions(-)
 create mode 100644 backends/hostmem-shm.c

Comments

Stefano Garzarella April 8, 2024, 8 a.m. UTC | #1
FYI I'll be on PTO till May 2nd, I'll send the v4 when I'm back ASAP.

Thanks,
Stefano

On Thu, Apr 04, 2024 at 02:23:19PM +0200, Stefano Garzarella wrote:
>v1: https://patchew.org/QEMU/20240228114759.44758-1-sgarzare@redhat.com/
>v2: https://patchew.org/QEMU/20240326133936.125332-1-sgarzare@redhat.com/
>v3:
>  - rebased on v9.0.0-rc2
>  - patch 4: avoiding setting fd non-blocking for messages where we
>    have memory fd (Eric)
>  - patch 9: enriched commit message and documentation to highlight that we
>    want to mimic memfd (David)
>
>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, and 8 enable building of frontends and backends (including
>libvhost-user) with associated code changes to succeed in compilation.
>
>Patch 9 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 10 and 11 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 39 (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
>
>Thanks,
>Stefano
>
>Stefano Garzarella (11):
>  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
>  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                             |  17 ++++
> subprojects/libvhost-user/libvhost-user.h |   2 +-
> backends/hostmem-shm.c                    | 118 ++++++++++++++++++++++
> contrib/vhost-user-blk/vhost-user-blk.c   |  23 ++++-
> hw/net/vhost_net.c                        |   5 +
> subprojects/libvhost-user/libvhost-user.c |  76 +++++++++++++-
> 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                           |  11 ++
> util/meson.build                          |   4 +-
> 15 files changed, 288 insertions(+), 18 deletions(-)
> create mode 100644 backends/hostmem-shm.c
>
>-- 
>2.44.0
>