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10 Commits

Author SHA1 Message Date
Laurent Vivier
412ed4f09f vhost-user: Report to front-end we support VHOST_USER_PROTOCOL_F_DEVICE_STATE 
Report to front-end that we support device state commands:
VHOST_USER_CHECK_DEVICE_STATE
VHOST_USER_SET_LOG_BASE

These feature is needed to transfer backend state using frontend
channel.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
 2025-01-20 19:51:24 +01:00
Laurent Vivier
31d70024be vhost-user: add VHOST_USER_SET_DEVICE_STATE_FD command 
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>
 2025-01-20 19:51:24 +01:00
Laurent Vivier
878e163454 vhost-user: add VHOST_USER_CHECK_DEVICE_STATE command 
After transferring the back-end’s internal state during migration,
check whether the back-end was able to successfully fully process
the state.

The value returned indicates success or error;
0 is success, any non-zero value is an error.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
 2025-01-20 19:51:24 +01:00
Laurent Vivier
78c73e9395 vhost-user: Report to front-end we support VHOST_USER_PROTOCOL_F_LOG_SHMFD 
This features allows QEMU to be migrated. We need also to report
VHOST_F_LOG_ALL.

This protocol feature reports we can log the page update and
implement VHOST_USER_SET_LOG_BASE and VHOST_USER_SET_LOG_FD.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
 2025-01-20 19:51:24 +01:00
Laurent Vivier
3c1d91b816 vhost-user: add VHOST_USER_SET_LOG_BASE command 
Sets logging shared memory space.

When the back-end has VHOST_USER_PROTOCOL_F_LOG_SHMFD protocol feature,
the log memory fd is provided in the ancillary data of
VHOST_USER_SET_LOG_BASE message, the size and offset of shared memory
area provided in the message.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
[sbrivio: Fix coding style in a bunch of places]
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
 2025-01-20 19:51:24 +01:00
Laurent Vivier
b04195c60f vhost-user: add VHOST_USER_SET_LOG_FD command 
VHOST_USER_SET_LOG_FD is an optional message with an eventfd
in ancillary data, it may be used to inform the front-end that the
log has been modified.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
[sbrivio: Fix comment to vu_set_log_fd_exec()]
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
 2025-01-20 19:51:24 +01:00
Laurent Vivier
6016e04a3a vhost-user: update protocol features and commands list 
vhost-user protocol specification has been updated with
feature flags and commands we will need to implement migration.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
[sbrivio: Fix comment to union vhost_user_payload]
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
 2025-01-20 19:51:24 +01:00
Laurent Vivier
00cc2303fd Fix build on 32bit target 
Fix the following errors when built with CFLAGS="-m32 -U__AVX2__":

packet.c:57:23: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 5 has type ‘size_t’ {aka ‘unsigned int’} [-Wformat=]
   57 |                 trace("packet offset plus length %lu from size %lu, "
   58 |                       "%s:%i", start - p->buf + len + offset,
      |                                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                                                     |
      |                                                     size_t {aka unsigned int}

packet.c:57:23: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 6 has type ‘size_t’ {aka ‘unsigned int’} [-Wformat=]
   57 |                 trace("packet offset plus length %lu from size %lu, "
      |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   58 |                       "%s:%i", start - p->buf + len + offset,
   59 |                       p->buf_size, func, line);
      |                       ~~~~~~~~~~~
      |                        |
      |                        size_t {aka unsigned int}

vhost_user.c:139:32: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
  139 |                         return (void *)(qemu_addr - r->qva + r->mmap_addr +
      |                                ^

vhost_user.c:439:32: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
  439 |                         munmap((void *)r->mmap_addr, r->size + r->mmap_offset);
      |                                ^

vhost_user.c:900:32: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
  900 |                         munmap((void *)r->mmap_addr, r->size + r->mmap_offset);
      |                                ^

virtio.c:111:32: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
  111 |                         return (void *)(guest_addr - r->gpa + r->mmap_addr +
      |                                ^

vu_common.c:37:27: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
   37 |                 char *m = (char *)dev_region->mmap_addr;
      |                           ^

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
 2024-11-27 16:49:21 +01:00
Laurent Vivier
28997fcb29 vhost-user: add vhost-user 
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>
 2024-11-27 16:47:32 +01:00
Laurent Vivier
31117b27c6 vhost-user: introduce vhost-user API 
Add vhost_user.c and vhost_user.h that define the functions needed
to implement vhost-user backend.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
 2024-11-27 16:12:19 +01:00