Saravanan D 59a6563a51 vmm, ch-remote: Allow VFIO fd substitution at receive-migration ...

The VmConfig that arrives over the migration stream carries the
source's device paths and stale FDs, none of which are usable on the
destination. A received VFIO device therefore needs fresh descriptors
supplied with the request.

VmReceiveMigrationData gains vfio_fds, pairing each device id with a
cdev FD, and iommufd_fd for the backing iommufd, both arriving over
SCM_RIGHTS. Once the received VmConfig is available, each named
device's path or FD is swapped for the received one and the iommufd is
installed before the VM is built, so the device comes up FD backed.

The request is rejected when a substituted device lacks the iommufd
backend, when an id is unknown or repeated, or when a device names no
replacement in vfio_fds. These checks run against the migrated VmConfig
once it has been received.

ch-remote gains the vfio_fds and iommufd_fd options and forwards the
descriptors over SCM_RIGHTS. The D-Bus transport cannot carry file
descriptors and drops them.

Signed-off-by: Saravanan D <saravanand@crusoe.ai>

2026-07-15 22:45:08 +00:00

..

src

vmm, ch-remote: Allow VFIO fd substitution at receive-migration

2026-07-15 22:45:08 +00:00

build.rs

build: Add "fuzzing" as a valid cfg(..) attribute

2024-05-08 08:10:28 +00:00

Cargo.toml

vmm: Make sev_snp depend on igvm

2026-06-10 21:29:40 +00:00