libkrun: vhost-user-can support#617
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Implement vhost-user support for connecting to external virtio device backends running in separate processes. Add vhost-user feature flag, vhost dependency, and krun_add_vhost_user_device() generalized API for adding vhost-user devices. Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
Add memfd-backed memory region creation to enable memory sharing with vhost-user backends via FD passing. When vhost-user is enabled, all guest RAM regions are created with memfd backing instead of anonymous mmap. This lays the groundwork for vhost-user device support while maintaining backward compatibility such that the VM boots normally with standard memory when vhost-user is not configured. Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
Implement generic vhost-user device wrapper with connection, feature negotiation, and Guest physical address(GPA) to Virtual address(VA) translation. Supports protocol feature negotiation (CONFIG, MQ) and forwards backend interrupts to guest. Co-authored-by: Matej Hrica <mhrica@redhat.com> Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
Add support for attaching vhost-user devices to the VM. The VMM now automatically suppresses the implicit RNG device when a vhost-user RNG is configured via krun_add_vhost_user_device(), allowing seamless switching between the standard virtio-rng and external vhost-user-rng backend for better isolation and flexibility. Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
Adds --vhost-user-rng command line option to specify a vhost-user RNG backend socket path. When provided, the VM uses the external vhost-user RNG device instead of the built-in virtio-rng implementation. Example usage: ./examples/chroot_vm \ --vhost-user-rng=/tmp/vhost-rng.sock0 \ / /bin/sh -c "head -c 32 /dev/hwrng | xxd" Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
Implement read_config() for vhost-user devices using the VHOST_USER_GET_CONFIG protocol message. This enables vhost-user devices to expose their configuration space to the guest. This provides a general mechanism for any vhost-user device that needs to expose configuration to the guest (e.g., virtio-snd). Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
Add constants and device-specific configuration for virtio-snd (vhost-user sound device). Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
Add --vhost-user-snd option to chroot_vm example,
allowing VMs to use external vhost-user sound backends
for audio playback and capture.
Usage:
./chroot_vm --vhost-user-snd=/path/to/sound.sock ...
Note: In the guest, the ALSA default device may not work without
additional configuration. Use explicit device specification:
aplay -D hw:0,0 /path/to/audio.wav
Or create /etc/asound.conf in the guest:
defaults.pcm.card 0
defaults.pcm.device 0
pcm.!default {
type hw
card 0
device 0
}
Tested with vhost-device-sound backend using PipeWire.
Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
Add public API constants for vhost-user vsock devices and example usage in chroot_vm. The underlying support already exists via the generic VhostUserDevice wrapper. Example integration: - Added --vhost-user-vsock option to chroot_vm - Calls krun_disable_implicit_vsock() to avoid conflict with built-in device - Skips TSI port mapping when vhost-user-vsock is active Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
Add public API constants for vhost-user CAN devices and example usage in chroot_vm. The underlying support already exists via the generic VhostUserDevice wrapper. Example integration: - Added --vhost-user-can option to chroot_vm - Uses 3 queues (TX, RX, control) with 64-entry queue sizes - Follows same pattern as other vhost-user device integrations Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
dorindabassey
requested review from
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jakecorrenti,
mtjhrc,
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Add public API constants for vhost-user CAN devices and
example usage in chroot_vm. The underlying support already
exists via the generic VhostUserDevice wrapper.
Example integration:
depends on libkrunfw: Add virtio-CAN driver support libkrunfw#115