CCing qemu-s390x.
On 01.09.20 17:00, Marc Hartmayer wrote:
> This patch series is about enabling virtio-fs on s390x. For that we need
> + some shim code (first patch), and we need
> + libvhost-user to deal with virtio endiannes for non-legacy virtio
>devices as mandated by the spec.
>
> How to use?
>
> For general instructions how to use virtio-fs (on x86) please have a
> look at https://virtio-fs.gitlab.io/howto-qemu.html. Most of the
> instructions can also be applied on s390x.
>
> In short:
>
> 1. Install self-compiled QEMU with this patch series applied
> 2. Prepare host and guest kernel so they support virtio-fs
>
> Start virtiofsd on the host
>
> $ virtiofsd -f --socket-path=/tmp/vhostqemu -o source=/tmp/shared
>
> Now you can start QEMU in a separate shell on the host:
>
> $ qemu-system-s390x -machine
> type=s390-ccw-virtio,accel=kvm,memory-backend=mem \
>-object
> memory-backend-file,id=mem,size=2G,mem-path=/dev/shm/virtiofs,share=on,prealloc=on,prealloc-threads=1
> \
>-chardev socket,id=char0,path=/tmp/vhostqemu -device
> vhost-user-fs-ccw,queue-size=1024,chardev=char0,tag=myfs \
>-drive if=virtio,file=disk.qcow2 \
>-m 2G -smp 2 -nographic
>
> Log into the guest and mount it
>
> $ mount -t virtiofs myfs /mnt
>
> Changelog:
> v1 -> v2:
> - rebased
> - patch 1:
>+ changed to Meson build. I kept the r-b from Conny since this
> change seems to be straightforward to me.
> - patch 2:
>+ added r-b from Michael
>+ added comment from Conny
> RFC v2 -> v1:
> - patch 1:
> + Added `force_revision_1 = true` (Conny)
> + I didn't add the r-b from Stefan Hajnoczi as I've added the
> changes suggested by Conny
> - squashed patches 2 and 3:
> + removed assertion in performance critical code path (Stefan)
> + dropped all dead code (Stefan)
> + removed libvhost-access.h
>
> RFC v1 -> RFC v2:
> + rebased
> + drop patch "libvhost-user: print invalid address on vu_panic" as it's not
> related to this series
> + drop patch "[RFC 4/4] HACK: Hard-code the libvhost-user.o-cflags for
> s390x"
> + patch "virtio: add vhost-user-fs-ccw device": replace qdev_set_parent_bus
> and object_property_set_bool by qdev_realize
> + patch "libvhost-user: handle endianness as mandated by the spec":
> Drop support for legacy virtio devices
> + add patch to fence legacy virtio devices
>
> Halil Pasic (1):
> virtio: add vhost-user-fs-ccw device
>
> Marc Hartmayer (1):
> libvhost-user: handle endianness as mandated by the spec
>
> contrib/libvhost-user/libvhost-user.c | 77 +++
> hw/s390x/meson.build | 1 +
> hw/s390x/vhost-user-fs-ccw.c | 75 ++
> 3 files changed, 119 insertions(+), 34 deletions(-)
> create mode 100644 hw/s390x/vhost-user-fs-ccw.c
>
