passt/vu_common.h, branch 2025_06_11.0293c6f Plug A Simple Socket Transport migrate: Skeleton of live migration logic 2025-02-12T18:47:07+00:00 Stefano Brivio sbrivio@redhat.com 2025-02-12T07:07:13+00:00 5911e08c0f53e46547e7eeb1dd824c8ab96e512e Introduce facilities for guest migration on top of vhost-user infrastructure. Add migration facilities based on top of the current vhost-user infrastructure, moving vu_migrate() and related functions to migrate.c. Versioned migration stages define function pointers to be called on source or target, or data sections that need to be transferred. The migration header consists of a magic number, a version number for the encoding, and a "compat_version" which represents the oldest version which is compatible with the current one. We don't use it yet, but that allows for the future possibility of backwards compatible protocol extensions. Co-authored-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com> 
Introduce facilities for guest migration on top of vhost-user
infrastructure.  Add migration facilities based on top of the current
vhost-user infrastructure, moving vu_migrate() and related functions
to migrate.c.

Versioned migration stages define function pointers to be called on
source or target, or data sections that need to be transferred.

The migration header consists of a magic number, a version number for the
encoding, and a "compat_version" which represents the oldest version which
is compatible with the current one.  We don't use it yet, but that allows
for the future possibility of backwards compatible protocol extensions.

Co-authored-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
vhost-user: add VHOST_USER_SET_DEVICE_STATE_FD command 2025-01-20T18:51:24+00:00 Laurent Vivier lvivier@redhat.com 2024-12-19T11:13:59+00:00 31d70024beda1e49131d7b68dd7554bee16c79f3 Set the file descriptor to use to transfer the backend device state during migration. Signed-off-by: Laurent Vivier <lvivier@redhat.com> [sbrivio: Fixed nits and coding style here and there] Signed-off-by: Stefano Brivio <sbrivio@redhat.com> 
Set the file descriptor to use to transfer the
backend device state during migration.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
[sbrivio: Fixed nits and coding style here and there]
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
virtio: Use const pointer for vu_dev 2025-01-05T22:48:59+00:00 Laurent Vivier lvivier@redhat.com 2024-12-19T11:13:52+00:00 898e853635a79e33917bb4646ff1fb5fc3a92997 We don't modify the structure in some virtio functions. Signed-off-by: Laurent Vivier <lvivier@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com> 
We don't modify the structure in some virtio functions.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
vhost-user: add vhost-user 2024-11-27T15:47:32+00:00 Laurent Vivier lvivier@redhat.com 2024-11-22T16:43:34+00:00 28997fcb29b560fc0dcfd91bad5eece3ded5eb72 add virtio and vhost-user functions to connect with QEMU. $ ./passt --vhost-user and # qemu-system-x86_64 ... -m 4G \ -object memory-backend-memfd,id=memfd0,share=on,size=4G \ -numa node,memdev=memfd0 \ -chardev socket,id=chr0,path=/tmp/passt_1.socket \ -netdev vhost-user,id=netdev0,chardev=chr0 \ -device virtio-net,mac=9a:2b:2c:2d:2e:2f,netdev=netdev0 \ ... Signed-off-by: Laurent Vivier <lvivier@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> [sbrivio: as suggested by lvivier, include <netinet/if_ether.h> before including <linux/if_ether.h> as C libraries such as musl __UAPI_DEF_ETHHDR in <netinet/if_ether.h> if they already have a definition of struct ethhdr] Signed-off-by: Stefano Brivio <sbrivio@redhat.com> 
add virtio and vhost-user functions to connect with QEMU.

  $ ./passt --vhost-user

and

  # qemu-system-x86_64 ... -m 4G \
        -object memory-backend-memfd,id=memfd0,share=on,size=4G \
        -numa node,memdev=memfd0 \
        -chardev socket,id=chr0,path=/tmp/passt_1.socket \
        -netdev vhost-user,id=netdev0,chardev=chr0 \
        -device virtio-net,mac=9a:2b:2c:2d:2e:2f,netdev=netdev0 \
        ...

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
[sbrivio: as suggested by lvivier, include <netinet/if_ether.h>
 before including <linux/if_ether.h> as C libraries such as musl
 __UAPI_DEF_ETHHDR in <netinet/if_ether.h> if they already have
 a definition of struct ethhdr]
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>