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[RFC v2 0/3] Enable virtio-fs on s390x
From: |
Marc Hartmayer |
Subject: |
[RFC v2 0/3] Enable virtio-fs on s390x |
Date: |
Fri, 17 Jul 2020 11:29:26 +0200 |
This RFC 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.
libvhost-access.h is based on hw/virtio/virtio-access.h.
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
+ 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 (2):
libvhost-user: handle endianness as mandated by the spec
libvhost-user: fence legacy virtio devices
contrib/libvhost-user/libvhost-access.h | 71 ++++++++++++++
contrib/libvhost-user/libvhost-user.c | 125 +++++++++++++-----------
hw/s390x/Makefile.objs | 1 +
hw/s390x/vhost-user-fs-ccw.c | 73 ++++++++++++++
4 files changed, 211 insertions(+), 59 deletions(-)
create mode 100644 contrib/libvhost-user/libvhost-access.h
create mode 100644 hw/s390x/vhost-user-fs-ccw.c
--
2.25.4