virtio-devices: introduce ActivationContext for device activation

Signed-off-by: Peter Oskolkov <posk@google.com>

fuzz/fuzz_targets/balloon.rs

@@ -95,15 +95,15 @@ fuzz_target!(|bytes: &[u8]| -> Corpus {
     reporting_queue_evt.write(1).unwrap();
 
     balloon
-        .activate(
-            guest_memory,
-            Arc::new(NoopVirtioInterrupt {}),
-            vec![
+        .activate(virtio_devices::ActivationContext {
+            mem: guest_memory,
+            interrupt_cb: Arc::new(NoopVirtioInterrupt {}),
+            queues: vec![
                 (0, inflate_q, inflate_evt),
                 (1, deflate_q, deflate_evt),
                 (2, reporting_q, reporting_evt),
             ],
-        )
+        })
         .ok();
 
     // Wait for the events to finish and balloon device worker thread to return

fuzz/fuzz_targets/block.rs

@@ -91,11 +91,11 @@ fuzz_target!(|bytes: &[u8]| -> Corpus {
     queue_evt.write(1).unwrap();
 
     block
-        .activate(
-            guest_memory,
-            Arc::new(NoopVirtioInterrupt {}),
-            vec![(0, q, evt)],
-        )
+        .activate(virtio_devices::ActivationContext {
+            mem: guest_memory,
+            interrupt_cb: Arc::new(NoopVirtioInterrupt {}),
+            queues: vec![(0, q, evt)],
+        })
         .ok();
 
     // Wait for the events to finish and block device worker thread to return

fuzz/fuzz_targets/console.rs

@@ -128,11 +128,11 @@ fuzz_target!(|bytes: &[u8]| -> Corpus {
     pipe_tx.write_all(console_input_bytes).unwrap(); // To use fuzzed data;
 
     console
-        .activate(
-            guest_memory,
-            Arc::new(NoopVirtioInterrupt {}),
-            vec![(0, input_queue, input_evt), (1, output_queue, output_evt)],
-        )
+        .activate(virtio_devices::ActivationContext {
+            mem: guest_memory,
+            interrupt_cb: Arc::new(NoopVirtioInterrupt {}),
+            queues: vec![(0, input_queue, input_evt), (1, output_queue, output_evt)],
+        })
         .unwrap();
 
     // Wait for the events to finish and console device worker thread to return

fuzz/fuzz_targets/iommu.rs

@@ -107,14 +107,14 @@ fuzz_target!(|bytes: &[u8]| -> Corpus {
     request_queue_evt.write(1).unwrap();
 
     iommu
-        .activate(
-            guest_memory,
-            Arc::new(NoopVirtioInterrupt {}),
-            vec![
+        .activate(virtio_devices::ActivationContext {
+            mem: guest_memory,
+            interrupt_cb: Arc::new(NoopVirtioInterrupt {}),
+            queues: vec![
                 (0, request_queue, request_evt),
                 (0, _event_queue, _event_evt),
             ],
-        )
+        })
         .ok();
 
     // Wait for the events to finish and vIOMMU device worker thread to return

fuzz/fuzz_targets/mem.rs

@@ -105,11 +105,11 @@ fuzz_target!(|bytes: &[u8]| -> Corpus {
     queue_evt.write(1).unwrap();
 
     virtio_mem
-        .activate(
-            guest_memory,
-            Arc::new(NoopVirtioInterrupt {}),
-            vec![(0, q, evt)],
-        )
+        .activate(virtio_devices::ActivationContext {
+            mem: guest_memory,
+            interrupt_cb: Arc::new(NoopVirtioInterrupt {}),
+            queues: vec![(0, q, evt)],
+        })
         .ok();
 
     // Wait for the events to finish and virtio-mem device worker thread to return

fuzz/fuzz_targets/net.rs

@@ -143,11 +143,11 @@ fuzz_target!(|bytes: &[u8]| -> Corpus {
     input_queue_evt.write(1).unwrap();
     output_queue_evt.write(1).unwrap();
 
-    net.activate(
-        guest_memory,
-        Arc::new(NoopVirtioInterrupt {}),
-        vec![(0, input_queue, input_evt), (1, output_queue, output_evt)],
-    )
+    net.activate(virtio_devices::ActivationContext {
+        mem: guest_memory,
+        interrupt_cb: Arc::new(NoopVirtioInterrupt {}),
+        queues: vec![(0, input_queue, input_evt), (1, output_queue, output_evt)],
+    })
     .unwrap();
 
     // Wait for the events to finish and net device worker thread to return

fuzz/fuzz_targets/pmem.rs

@@ -61,11 +61,11 @@ fuzz_target!(|bytes: &[u8]| -> Corpus {
     // Kick the 'queue' event before activate the pmem device
     queue_evt.write(1).unwrap();
 
-    pmem.activate(
-        guest_memory,
-        Arc::new(NoopVirtioInterrupt {}),
-        vec![(0, q, evt)],
-    )
+    pmem.activate(virtio_devices::ActivationContext {
+        mem: guest_memory,
+        interrupt_cb: Arc::new(NoopVirtioInterrupt {}),
+        queues: vec![(0, q, evt)],
+    })
     .ok();
 
     // Wait for the events to finish and pmem device worker thread to return

fuzz/fuzz_targets/rng.rs

@@ -99,11 +99,11 @@ fuzz_target!(|bytes: &[u8]| -> Corpus {
     // Kick the 'queue' event before activate the rng device
     queue_evt.write(1).unwrap();
 
-    rng.activate(
-        guest_memory,
-        Arc::new(NoopVirtioInterrupt {}),
-        vec![(0, q, evt)],
-    )
+    rng.activate(virtio_devices::ActivationContext {
+        mem: guest_memory,
+        interrupt_cb: Arc::new(NoopVirtioInterrupt {}),
+        queues: vec![(0, q, evt)],
+    })
     .ok();
 
     // Wait for the events to finish and rng device worker thread to return

fuzz/fuzz_targets/vsock.rs

@@ -108,11 +108,11 @@ fuzz_target!(|bytes: &[u8]| -> Corpus {
     .unwrap();
 
     vsock
-        .activate(
-            guest_memory,
-            Arc::new(NoopVirtioInterrupt {}),
-            vec![(0, q, evt)],
-        )
+        .activate(virtio_devices::ActivationContext {
+            mem: guest_memory,
+            interrupt_cb: Arc::new(NoopVirtioInterrupt {}),
+            queues: vec![(0, q, evt)],
+        })
         .ok();
 
     // Wait for the events to finish and vsock device worker thread to return

fuzz/fuzz_targets/watchdog.rs

@@ -64,11 +64,11 @@ fuzz_target!(|bytes: &[u8]| -> Corpus {
     queue_evt.write(1).unwrap();
 
     watchdog
-        .activate(
-            guest_memory,
-            Arc::new(NoopVirtioInterrupt {}),
-            vec![(0, q, evt)],
-        )
+        .activate(virtio_devices::ActivationContext {
+            mem: guest_memory,
+            interrupt_cb: Arc::new(NoopVirtioInterrupt {}),
+            queues: vec![(0, q, evt)],
+        })
         .ok();
 
     // Wait for the events to finish and watchdog device worker thread to return

virtio-devices/src/balloon.rs

@@ -590,12 +590,13 @@ impl VirtioDevice for Balloon {
         }
     }
 
-    fn activate(
-        &mut self,
-        mem: GuestMemoryAtomic<GuestMemoryMmap>,
-        interrupt_cb: Arc<dyn VirtioInterrupt>,
-        mut queues: Vec<(usize, Queue, EventFd)>,
-    ) -> ActivateResult {
+    fn activate(&mut self, context: crate::device::ActivationContext) -> ActivateResult {
+        let crate::device::ActivationContext {
+            mem,
+            interrupt_cb,
+            mut queues,
+            ..
+        } = context;
         self.common.activate(&queues, interrupt_cb.clone())?;
         let (kill_evt, pause_evt) = self.common.dup_eventfds();
 

virtio-devices/src/block.rs

@@ -1008,12 +1008,12 @@ impl VirtioDevice for Block {
         self.update_writeback();
     }
 
-    fn activate(
-        &mut self,
-        mem: GuestMemoryAtomic<GuestMemoryMmap>,
-        interrupt_cb: Arc<dyn VirtioInterrupt>,
-        mut queues: Vec<(usize, Queue, EventFd)>,
-    ) -> ActivateResult {
+    fn activate(&mut self, context: crate::device::ActivationContext) -> ActivateResult {
+        let crate::device::ActivationContext {
+            mem,
+            interrupt_cb,
+            mut queues,
+        } = context;
         // See if the guest didn't ack the device being read-only.
         // If so, warn and pretend it did.
         let original_acked_features = self.common.acked_features;

virtio-devices/src/console.rs

@@ -710,12 +710,13 @@ impl VirtioDevice for Console {
         self.read_config_from_slice(self.config.lock().unwrap().as_slice(), offset, data);
     }
 
-    fn activate(
-        &mut self,
-        mem: GuestMemoryAtomic<GuestMemoryMmap>,
-        interrupt_cb: Arc<dyn VirtioInterrupt>,
-        mut queues: Vec<(usize, Queue, EventFd)>,
-    ) -> ActivateResult {
+    fn activate(&mut self, context: crate::device::ActivationContext) -> ActivateResult {
+        let crate::device::ActivationContext {
+            mem,
+            interrupt_cb,
+            mut queues,
+            ..
+        } = context;
         self.common.activate(&queues, interrupt_cb.clone())?;
         self.resizer
             .acked_features

virtio-devices/src/device.rs

@@ -53,6 +53,12 @@ pub struct VirtioSharedMemoryList {
     pub region_list: Vec<VirtioSharedMemory>,
 }
 
+pub struct ActivationContext {
+    pub mem: GuestMemoryAtomic<GuestMemoryMmap>,
+    pub interrupt_cb: Arc<dyn VirtioInterrupt>,
+    pub queues: Vec<(usize, Queue, EventFd)>,
+}
+
 /// Trait for virtio devices to be driven by a virtio transport.
 ///
 /// The lifecycle of a virtio device is to be moved to a virtio transport, which will then query the
@@ -94,12 +100,7 @@ pub trait VirtioDevice: Send {
     }
 
     /// Activates this device for real usage.
-    fn activate(
-        &mut self,
-        mem: GuestMemoryAtomic<GuestMemoryMmap>,
-        interrupt_evt: Arc<dyn VirtioInterrupt>,
-        queues: Vec<(usize, Queue, EventFd)>,
-    ) -> ActivateResult;
+    fn activate(&mut self, context: ActivationContext) -> ActivateResult;
 
     /// Optionally deactivates this device and returns ownership of the guest memory map, interrupt
     /// event, and queue events.

virtio-devices/src/iommu.rs

@@ -1075,12 +1075,13 @@ impl VirtioDevice for Iommu {
         self.update_bypass();
     }
 
-    fn activate(
-        &mut self,
-        mem: GuestMemoryAtomic<GuestMemoryMmap>,
-        interrupt_cb: Arc<dyn VirtioInterrupt>,
-        mut queues: Vec<(usize, Queue, EventFd)>,
-    ) -> ActivateResult {
+    fn activate(&mut self, context: crate::device::ActivationContext) -> ActivateResult {
+        let crate::device::ActivationContext {
+            mem,
+            interrupt_cb,
+            mut queues,
+            ..
+        } = context;
         self.common.activate(&queues, interrupt_cb.clone())?;
         let (kill_evt, pause_evt) = self.common.dup_eventfds();
 

virtio-devices/src/lib.rs

@@ -42,8 +42,8 @@ pub use self::balloon::Balloon;
 pub use self::block::{Block, BlockState};
 pub use self::console::{Console, ConsoleResizer, Endpoint};
 pub use self::device::{
-    DmaRemapping, VirtioCommon, VirtioDevice, VirtioInterrupt, VirtioInterruptType,
-    VirtioSharedMemoryList,
+    ActivationContext, DmaRemapping, VirtioCommon, VirtioDevice, VirtioInterrupt,
+    VirtioInterruptType, VirtioSharedMemoryList,
 };
 pub use self::epoll_helper::{
     EPOLL_HELPER_EVENT_LAST, EpollHelper, EpollHelperError, EpollHelperHandler,

virtio-devices/src/mem.rs

@@ -950,12 +950,13 @@ impl VirtioDevice for Mem {
         self.read_config_from_slice(self.config.lock().unwrap().as_slice(), offset, data);
     }
 
-    fn activate(
-        &mut self,
-        mem: GuestMemoryAtomic<GuestMemoryMmap>,
-        interrupt_cb: Arc<dyn VirtioInterrupt>,
-        mut queues: Vec<(usize, Queue, EventFd)>,
-    ) -> ActivateResult {
+    fn activate(&mut self, context: crate::device::ActivationContext) -> ActivateResult {
+        let crate::device::ActivationContext {
+            mem,
+            interrupt_cb,
+            mut queues,
+            ..
+        } = context;
         self.common.activate(&queues, interrupt_cb.clone())?;
         let (kill_evt, pause_evt) = self.common.dup_eventfds();
 

virtio-devices/src/net.rs

@@ -693,12 +693,12 @@ impl VirtioDevice for Net {
         self.read_config_from_slice(self.config.as_slice(), offset, data);
     }
 
-    fn activate(
-        &mut self,
-        mem: GuestMemoryAtomic<GuestMemoryMmap>,
-        interrupt_cb: Arc<dyn VirtioInterrupt>,
-        mut queues: Vec<(usize, Queue, EventFd)>,
-    ) -> ActivateResult {
+    fn activate(&mut self, context: crate::device::ActivationContext) -> ActivateResult {
+        let crate::device::ActivationContext {
+            mem,
+            interrupt_cb,
+            mut queues,
+        } = context;
         self.common.activate(&queues, interrupt_cb.clone())?;
 
         let num_queues = queues.len();

virtio-devices/src/pmem.rs

@@ -377,12 +377,13 @@ impl VirtioDevice for Pmem {
         self.read_config_from_slice(self.config.as_slice(), offset, data);
     }
 
-    fn activate(
-        &mut self,
-        mem: GuestMemoryAtomic<GuestMemoryMmap>,
-        interrupt_cb: Arc<dyn VirtioInterrupt>,
-        mut queues: Vec<(usize, Queue, EventFd)>,
-    ) -> ActivateResult {
+    fn activate(&mut self, context: crate::device::ActivationContext) -> ActivateResult {
+        let crate::device::ActivationContext {
+            mem,
+            interrupt_cb,
+            mut queues,
+            ..
+        } = context;
         self.common.activate(&queues, interrupt_cb.clone())?;
         let (kill_evt, pause_evt) = self.common.dup_eventfds();
         if let Some(disk) = self.disk.as_ref() {

virtio-devices/src/rng.rs

@@ -244,12 +244,13 @@ impl VirtioDevice for Rng {
         self.common.ack_features(value);
     }
 
-    fn activate(
-        &mut self,
-        mem: GuestMemoryAtomic<GuestMemoryMmap>,
-        interrupt_cb: Arc<dyn VirtioInterrupt>,
-        mut queues: Vec<(usize, Queue, EventFd)>,
-    ) -> ActivateResult {
+    fn activate(&mut self, context: crate::device::ActivationContext) -> ActivateResult {
+        let crate::device::ActivationContext {
+            mem,
+            interrupt_cb,
+            mut queues,
+            ..
+        } = context;
         self.common.activate(&queues, interrupt_cb.clone())?;
         let (kill_evt, pause_evt) = self.common.dup_eventfds();
 

virtio-devices/src/transport/pci_common_config.rs

@@ -404,11 +404,8 @@ impl Snapshottable for VirtioPciCommonConfig {
 
 #[cfg(test)]
 mod unit_tests {
-    use vm_memory::GuestMemoryAtomic;
-    use vmm_sys_util::eventfd::EventFd;
-
     use super::*;
-    use crate::{ActivateResult, GuestMemoryMmap, VirtioInterrupt};
+    use crate::{ActivateResult, ActivationContext};
 
     struct DummyDevice(u32);
     const QUEUE_SIZE: u16 = 256;
@@ -421,12 +418,7 @@ mod unit_tests {
         fn queue_max_sizes(&self) -> &[u16] {
             QUEUE_SIZES
         }
-        fn activate(
-            &mut self,
-            _mem: GuestMemoryAtomic<GuestMemoryMmap>,
-            _interrupt_evt: Arc<dyn VirtioInterrupt>,
-            _queues: Vec<(usize, Queue, EventFd)>,
-        ) -> ActivateResult {
+        fn activate(&mut self, _context: ActivationContext) -> ActivateResult {
             Ok(())
         }
 

virtio-devices/src/transport/pci_device.rs

@@ -309,12 +309,13 @@ pub struct VirtioPciDeviceActivator {
 }
 
 impl VirtioPciDeviceActivator {
-    pub fn activate(&mut self) -> ActivateResult {
-        self.device.lock().unwrap().activate(
-            self.memory.take().unwrap(),
-            self.interrupt.take().unwrap(),
-            self.queues.take().unwrap(),
-        )?;
+    pub fn activate(mut self) -> ActivateResult {
+        let mut locked_device = self.device.lock().unwrap();
+        locked_device.activate(crate::device::ActivationContext {
+            mem: self.memory.take().unwrap(),
+            interrupt_cb: self.interrupt.take().unwrap(),
+            queues: self.queues.take().unwrap(),
+        })?;
         self.device_activated.store(true, Ordering::SeqCst);
 
         if let Some(barrier) = self.barrier.take() {

virtio-devices/src/vdpa.rs

@@ -428,12 +428,13 @@ impl VirtioDevice for Vdpa {
         }
     }
 
-    fn activate(
-        &mut self,
-        mem: GuestMemoryAtomic<GuestMemoryMmap>,
-        virtio_interrupt: Arc<dyn VirtioInterrupt>,
-        queues: Vec<(usize, Queue, EventFd)>,
-    ) -> ActivateResult {
+    fn activate(&mut self, context: crate::device::ActivationContext) -> ActivateResult {
+        let crate::device::ActivationContext {
+            mem,
+            interrupt_cb: virtio_interrupt,
+            queues,
+            ..
+        } = context;
         self.activate_vdpa(&mem.memory(), virtio_interrupt.as_ref(), &queues)
             .map_err(ActivateError::ActivateVdpa)?;
 

virtio-devices/src/vhost_user/blk.rs

@@ -19,7 +19,6 @@ use virtio_bindings::virtio_blk::{
     VIRTIO_BLK_F_GEOMETRY, VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_RO, VIRTIO_BLK_F_SEG_MAX,
     VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_WRITE_ZEROES,
 };
-use virtio_queue::Queue;
 use vm_memory::{ByteValued, GuestMemoryAtomic};
 use vm_migration::protocol::MemoryRangeTable;
 use vm_migration::{Migratable, MigratableError, Pausable, Snapshot, Snapshottable, Transportable};
@@ -279,12 +278,13 @@ impl VirtioDevice for Blk {
         }
     }
 
-    fn activate(
-        &mut self,
-        mem: GuestMemoryAtomic<GuestMemoryMmap>,
-        interrupt_cb: Arc<dyn VirtioInterrupt>,
-        queues: Vec<(usize, Queue, EventFd)>,
-    ) -> ActivateResult {
+    fn activate(&mut self, context: crate::device::ActivationContext) -> ActivateResult {
+        let crate::device::ActivationContext {
+            mem,
+            interrupt_cb,
+            queues,
+            ..
+        } = context;
         self.common.activate(&queues, interrupt_cb.clone())?;
         self.guest_memory = Some(mem.clone());
 

virtio-devices/src/vhost_user/fs.rs

@@ -12,7 +12,6 @@ use serde::{Deserialize, Serialize};
 use serde_with::{Bytes, serde_as};
 use vhost::vhost_user::message::{VhostUserProtocolFeatures, VhostUserVirtioFeatures};
 use vhost::vhost_user::{FrontendReqHandler, VhostUserFrontend, VhostUserFrontendReqHandler};
-use virtio_queue::Queue;
 use vm_device::UserspaceMapping;
 use vm_memory::{ByteValued, GuestMemoryAtomic};
 use vm_migration::protocol::MemoryRangeTable;
@@ -261,12 +260,13 @@ impl VirtioDevice for Fs {
         self.read_config_from_slice(self.config.as_slice(), offset, data);
     }
 
-    fn activate(
-        &mut self,
-        mem: GuestMemoryAtomic<GuestMemoryMmap>,
-        interrupt_cb: Arc<dyn VirtioInterrupt>,
-        queues: Vec<(usize, Queue, EventFd)>,
-    ) -> ActivateResult {
+    fn activate(&mut self, context: crate::device::ActivationContext) -> ActivateResult {
+        let crate::device::ActivationContext {
+            mem,
+            interrupt_cb,
+            queues,
+            ..
+        } = context;
         self.common.activate(&queues, interrupt_cb.clone())?;
         self.guest_memory = Some(mem.clone());
 

virtio-devices/src/vhost_user/generic_vhost_user.rs

@@ -14,7 +14,6 @@ use vhost::vhost_user::message::{
     VhostUserConfigFlags, VhostUserProtocolFeatures, VhostUserVirtioFeatures,
 };
 use vhost::vhost_user::{FrontendReqHandler, VhostUserFrontend, VhostUserFrontendReqHandler};
-use virtio_queue::Queue;
 use vm_device::UserspaceMapping;
 use vm_memory::GuestMemoryAtomic;
 use vm_migration::protocol::MemoryRangeTable;
@@ -277,12 +276,13 @@ impl VirtioDevice for GenericVhostUser {
         }
     }
 
-    fn activate(
-        &mut self,
-        mem: GuestMemoryAtomic<GuestMemoryMmap>,
-        interrupt_cb: Arc<dyn VirtioInterrupt>,
-        queues: Vec<(usize, Queue, EventFd)>,
-    ) -> ActivateResult {
+    fn activate(&mut self, context: crate::device::ActivationContext) -> ActivateResult {
+        let crate::device::ActivationContext {
+            mem,
+            interrupt_cb,
+            queues,
+            ..
+        } = context;
         self.common.activate(&queues, interrupt_cb.clone())?;
         self.guest_memory = Some(mem.clone());
 

virtio-devices/src/vhost_user/net.rs

@@ -19,7 +19,7 @@ use virtio_bindings::virtio_net::{
     VIRTIO_NET_F_MAC, VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_MTU,
 };
 use virtio_bindings::virtio_ring::VIRTIO_RING_F_EVENT_IDX;
-use virtio_queue::{Queue, QueueT};
+use virtio_queue::QueueT;
 use vm_memory::{ByteValued, GuestMemoryAtomic};
 use vm_migration::protocol::MemoryRangeTable;
 use vm_migration::{Migratable, MigratableError, Pausable, Snapshot, Snapshottable, Transportable};
@@ -288,12 +288,13 @@ impl VirtioDevice for Net {
         self.read_config_from_slice(self.config.as_slice(), offset, data);
     }
 
-    fn activate(
-        &mut self,
-        mem: GuestMemoryAtomic<GuestMemoryMmap>,
-        interrupt_cb: Arc<dyn VirtioInterrupt>,
-        mut queues: Vec<(usize, Queue, EventFd)>,
-    ) -> ActivateResult {
+    fn activate(&mut self, context: crate::device::ActivationContext) -> ActivateResult {
+        let crate::device::ActivationContext {
+            mem,
+            interrupt_cb,
+            mut queues,
+            ..
+        } = context;
         self.common.activate(&queues, interrupt_cb.clone())?;
         self.guest_memory = Some(mem.clone());
 

virtio-devices/src/vsock/device.rs

@@ -435,12 +435,13 @@ where
         }
     }
 
-    fn activate(
-        &mut self,
-        mem: GuestMemoryAtomic<GuestMemoryMmap>,
-        interrupt_cb: Arc<dyn VirtioInterrupt>,
-        queues: Vec<(usize, Queue, EventFd)>,
-    ) -> ActivateResult {
+    fn activate(&mut self, context: crate::device::ActivationContext) -> ActivateResult {
+        let crate::device::ActivationContext {
+            mem,
+            interrupt_cb,
+            queues,
+            ..
+        } = context;
         self.common.activate(&queues, interrupt_cb.clone())?;
         let (kill_evt, pause_evt) = self.common.dup_eventfds();
 
@@ -593,9 +594,11 @@ mod unit_tests {
         let memory = GuestMemoryAtomic::new(ctx.mem.clone());
 
         // Test a bad activation.
-        let bad_activate =
-            ctx.device
-                .activate(memory.clone(), Arc::new(NoopVirtioInterrupt {}), Vec::new());
+        let bad_activate = ctx.device.activate(crate::device::ActivationContext {
+            mem: memory.clone(),
+            interrupt_cb: Arc::new(NoopVirtioInterrupt {}),
+            queues: Vec::new(),
+        });
         match bad_activate {
             Err(ActivateError::BadActivate) => (),
             other => panic!("{other:?}"),
@@ -603,10 +606,10 @@ mod unit_tests {
 
         // Test a correct activation.
         ctx.device
-            .activate(
-                memory,
-                Arc::new(NoopVirtioInterrupt {}),
-                vec![
+            .activate(crate::device::ActivationContext {
+                mem: memory,
+                interrupt_cb: Arc::new(NoopVirtioInterrupt {}),
+                queues: vec![
                     (
                         0,
                         Queue::new(256).unwrap(),
@@ -623,7 +626,7 @@ mod unit_tests {
                         EventFd::new(EFD_NONBLOCK).unwrap(),
                     ),
                 ],
-            )
+            })
             .unwrap();
     }
 

virtio-devices/src/watchdog.rs

@@ -326,12 +326,13 @@ impl VirtioDevice for Watchdog {
         self.common.ack_features(value);
     }
 
-    fn activate(
-        &mut self,
-        mem: GuestMemoryAtomic<GuestMemoryMmap>,
-        interrupt_cb: Arc<dyn VirtioInterrupt>,
-        mut queues: Vec<(usize, Queue, EventFd)>,
-    ) -> ActivateResult {
+    fn activate(&mut self, context: crate::device::ActivationContext) -> ActivateResult {
+        let crate::device::ActivationContext {
+            mem,
+            interrupt_cb,
+            mut queues,
+            ..
+        } = context;
         self.common.activate(&queues, interrupt_cb.clone())?;
         let (kill_evt, pause_evt) = self.common.dup_eventfds();
 

vmm/src/device_manager.rs

@@ -4543,7 +4543,7 @@ impl DeviceManager {
     }
 
     pub fn activate_virtio_devices(&self) -> DeviceManagerResult<()> {
-        for mut activator in self.pending_activations.lock().unwrap().drain(..) {
+        for activator in self.pending_activations.lock().unwrap().drain(..) {
             activator
                 .activate()
                 .map_err(DeviceManagerError::VirtioActivate)?;