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vmm: Add support for hotplugging user devices

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Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2021-07-30 14:48:58 +00:00
parent f99462add4
commit 53b2e19934
6 changed files with 114 additions and 8 deletions
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4
vmm/src/api/http.rs
View File

@ -77,6 +77,9 @@ pub enum HttpError {
/// Could not add a device to a VM
VmAddDevice(ApiError),
/// Could not add a user device to the VM
VmAddUserDevice(ApiError),
/// Could not remove a device from a VM
VmRemoveDevice(ApiError),
@ -207,6 +210,7 @@ lazy_static! {
};
r.routes.insert(endpoint!("/vm.add-device"), Box::new(VmActionHandler::new(VmAction::AddDevice(Arc::default()))));
r.routes.insert(endpoint!("/vm.add-user-device"), Box::new(VmActionHandler::new(VmAction::AddUserDevice(Arc::default()))));
r.routes.insert(endpoint!("/vm.add-disk"), Box::new(VmActionHandler::new(VmAction::AddDisk(Arc::default()))));
r.routes.insert(endpoint!("/vm.add-fs"), Box::new(VmActionHandler::new(VmAction::AddFs(Arc::default()))));
r.routes.insert(endpoint!("/vm.add-net"), Box::new(VmActionHandler::new(VmAction::AddNet(Arc::default()))));

17
vmm/src/api/http_endpoint.rs
View File

@ -5,11 +5,11 @@
use crate::api::http::{error_response, EndpointHandler, HttpError};
use crate::api::{
vm_add_device, vm_add_disk, vm_add_fs, vm_add_net, vm_add_pmem, vm_add_vsock, vm_boot,
vm_counters, vm_create, vm_delete, vm_info, vm_pause, vm_power_button, vm_reboot,
vm_receive_migration, vm_remove_device, vm_resize, vm_resize_zone, vm_restore, vm_resume,
vm_send_migration, vm_shutdown, vm_snapshot, vmm_ping, vmm_shutdown, ApiRequest, VmAction,
VmConfig,
vm_add_device, vm_add_disk, vm_add_fs, vm_add_net, vm_add_pmem, vm_add_user_device,
vm_add_vsock, vm_boot, vm_counters, vm_create, vm_delete, vm_info, vm_pause, vm_power_button,
vm_reboot, vm_receive_migration, vm_remove_device, vm_resize, vm_resize_zone, vm_restore,
vm_resume, vm_send_migration, vm_shutdown, vm_snapshot, vmm_ping, vmm_shutdown, ApiRequest,
VmAction, VmConfig,
};
use crate::config::NetConfig;
use micro_http::{Body, Method, Request, Response, StatusCode, Version};
@ -127,6 +127,13 @@ impl EndpointHandler for VmActionHandler {
)
.map_err(HttpError::VmAddVsock),
AddUserDevice(_) => vm_add_user_device(
api_notifier,
api_sender,
Arc::new(serde_json::from_slice(body.raw())?),
)
.map_err(HttpError::VmAddUserDevice),
RemoveDevice(_) => vm_remove_device(
api_notifier,
api_sender,

19
vmm/src/api/mod.rs
View File

@ -34,6 +34,7 @@ pub use self::http::start_http_path_thread;
pub mod http;
pub mod http_endpoint;
use crate::config::UserDeviceConfig;
use crate::config::{
DeviceConfig, DiskConfig, FsConfig, NetConfig, PmemConfig, RestoreConfig, VmConfig, VsockConfig,
};
@ -109,6 +110,9 @@ pub enum ApiError {
/// The device could not be added to the VM.
VmAddDevice(VmError),
/// The user device could not be added to the VM.
VmAddUserDevice(VmError),
/// The device could not be removed from the VM.
VmRemoveDevice(VmError),
@ -269,6 +273,9 @@ pub enum ApiRequest {
/// Add a device to the VM.
VmAddDevice(Arc<DeviceConfig>, Sender<ApiResponse>),
/// Add a user device to the VM.
VmAddUserDevice(Arc<UserDeviceConfig>, Sender<ApiResponse>),
/// Remove a device from the VM.
VmRemoveDevice(Arc<VmRemoveDeviceData>, Sender<ApiResponse>),
@ -364,6 +371,9 @@ pub enum VmAction {
/// Add vsock
AddVsock(Arc<VsockConfig>),
/// Add user device
AddUserDevice(Arc<UserDeviceConfig>),
/// Remove VFIO device
RemoveDevice(Arc<VmRemoveDeviceData>),
@ -411,6 +421,7 @@ fn vm_action(
AddPmem(v) => ApiRequest::VmAddPmem(v, response_sender),
AddNet(v) => ApiRequest::VmAddNet(v, response_sender),
AddVsock(v) => ApiRequest::VmAddVsock(v, response_sender),
AddUserDevice(v) => ApiRequest::VmAddUserDevice(v, response_sender),
RemoveDevice(v) => ApiRequest::VmRemoveDevice(v, response_sender),
Resize(v) => ApiRequest::VmResize(v, response_sender),
ResizeZone(v) => ApiRequest::VmResizeZone(v, response_sender),
@ -572,6 +583,14 @@ pub fn vm_add_device(
vm_action(api_evt, api_sender, VmAction::AddDevice(data))
}
pub fn vm_add_user_device(
api_evt: EventFd,
api_sender: Sender<ApiRequest>,
data: Arc<UserDeviceConfig>,
) -> ApiResult<Option<Body>> {
vm_action(api_evt, api_sender, VmAction::AddUserDevice(data))
}
pub fn vm_remove_device(
api_evt: EventFd,
api_sender: Sender<ApiRequest>,

22
vmm/src/device_manager.rs
View File

@ -3317,6 +3317,28 @@ impl DeviceManager {
})
}
pub fn add_user_device(
&mut self,
device_cfg: &mut UserDeviceConfig,
) -> DeviceManagerResult<PciDeviceInfo> {
let pci = if let Some(pci_bus) = &self.pci_bus {
Arc::clone(pci_bus)
} else {
return Err(DeviceManagerError::NoPciBus);
};
let (device_id, device_name) =
self.add_vfio_user_device(&mut pci.lock().unwrap(), device_cfg)?;
// Update the PCIU bitmap
self.pci_devices_up |= 1 << (device_id >> 3);
Ok(PciDeviceInfo {
id: device_name,
bdf: device_id,
})
}
pub fn remove_device(&mut self, id: String) -> DeviceManagerResult<()> {
// The node can be directly a PCI node in case the 'id' refers to a
// VFIO device or a virtio-pci one.

25
vmm/src/lib.rs
View File

@ -20,7 +20,8 @@ use crate::api::{
VmSendMigrationData, VmmPingResponse,
};
use crate::config::{
DeviceConfig, DiskConfig, FsConfig, NetConfig, PmemConfig, RestoreConfig, VmConfig, VsockConfig,
DeviceConfig, DiskConfig, FsConfig, NetConfig, PmemConfig, RestoreConfig, UserDeviceConfig,
VmConfig, VsockConfig,
};
use crate::migration::{get_vm_snapshot, recv_vm_snapshot};
use crate::seccomp_filters::{get_seccomp_filter, Thread};
@ -645,6 +646,21 @@ impl Vmm {
}
}
fn vm_add_user_device(
&mut self,
device_cfg: UserDeviceConfig,
) -> result::Result<Vec<u8>, VmError> {
if let Some(ref mut vm) = self.vm {
let info = vm.add_user_device(device_cfg).map_err(|e| {
error!("Error when adding new user device to the VM: {:?}", e);
e
})?;
serde_json::to_vec(&info).map_err(VmError::SerializeJson)
} else {
Err(VmError::VmNotRunning)
}
}
fn vm_remove_device(&mut self, id: String) -> result::Result<(), VmError> {
if let Some(ref mut vm) = self.vm {
if let Err(e) = vm.remove_device(id) {
@ -1414,6 +1430,13 @@ impl Vmm {
.map(ApiResponsePayload::VmAction);
sender.send(response).map_err(Error::ApiResponseSend)?;
}
ApiRequest::VmAddUserDevice(add_device_data, sender) => {
let response = self
.vm_add_user_device(add_device_data.as_ref().clone())
.map_err(ApiError::VmAddUserDevice)
.map(ApiResponsePayload::VmAction);
sender.send(response).map_err(Error::ApiResponseSend)?;
}
ApiRequest::VmRemoveDevice(remove_device_data, sender) => {
let response = self
.vm_remove_device(remove_device_data.id.clone())

35
vmm/src/vm.rs
View File

@ -14,8 +14,8 @@
#[cfg(any(target_arch = "aarch64", feature = "acpi"))]
use crate::config::NumaConfig;
use crate::config::{
DeviceConfig, DiskConfig, FsConfig, HotplugMethod, NetConfig, PmemConfig, ValidationError,
VmConfig, VsockConfig,
DeviceConfig, DiskConfig, FsConfig, HotplugMethod, NetConfig, PmemConfig, UserDeviceConfig,
ValidationError, VmConfig, VsockConfig,
};
use crate::cpu;
use crate::device_manager::{
@ -1345,6 +1345,37 @@ impl Vm {
Ok(pci_device_info)
}
pub fn add_user_device(&mut self, mut device_cfg: UserDeviceConfig) -> Result<PciDeviceInfo> {
{
// Validate on a clone of the config
let mut config = self.config.lock().unwrap().clone();
Self::add_to_config(&mut config.user_devices, device_cfg.clone());
config.validate().map_err(Error::ConfigValidation)?;
}
let pci_device_info = self
.device_manager
.lock()
.unwrap()
.add_user_device(&mut device_cfg)
.map_err(Error::DeviceManager)?;
// Update VmConfig by adding the new device. This is important to
// ensure the device would be created in case of a reboot.
{
let mut config = self.config.lock().unwrap();
Self::add_to_config(&mut config.user_devices, device_cfg);
}
self.device_manager
.lock()
.unwrap()
.notify_hotplug(AcpiNotificationFlags::PCI_DEVICES_CHANGED)
.map_err(Error::DeviceManager)?;
Ok(pci_device_info)
}
pub fn remove_device(&mut self, _id: String) -> Result<()> {
self.device_manager
.lock()