pci: add virtio-pci transport implementation

Add a VirtIO PCI transport implementation. Nothing uses it at the
moment. This requires a few changes in our vended pci and vm-device
crates.

Signed-off-by: Babis Chalios <[email protected]>

Author: bchalios

Cargo.lock

@@ -17,11 +17,13 @@ gdb = ["arrayvec", "gdbstub", "gdbstub_arch"]
 
 acpi_tables = { path = "../acpi-tables" }
 aes-gcm = { version = "0.10.1", default-features = false, features = ["aes"] }
+anyhow = "1.0.98"
 arrayvec = { version = "0.7.6", optional = true }
 aws-lc-rs = { version = "1.13.1", features = ["bindgen"] }
 base64 = "0.22.1"
 bincode = { version = "2.0.1", features = ["serde"] }
 bitflags = "2.9.1"
+byteorder = "1.5.0"
 crc64 = "2.0.0"
 derive_more = { version = "2.0.1", default-features = false, features = [
   "from",

src/vmm/Cargo.toml

@@ -148,7 +148,7 @@ pub trait VirtioDevice: AsAny + Send {
 
     /// Optionally deactivates this device and returns ownership of the guest memory map, interrupt
     /// event, and queue events.
-    fn reset(&mut self) -> Option<(EventFd, Vec<EventFd>)> {
+    fn reset(&mut self) -> Option<(Arc<dyn VirtioInterrupt>, Vec<EventFd>)> {
         None
     }
 

src/vmm/src/devices/virtio/device.rs

@@ -712,6 +712,19 @@ impl Queue {
 
         new - used_event - Wrapping(1) < new - old
     }
+
+    /// Resets the Virtio Queue
+    pub(crate) fn reset(&mut self) {
+        self.ready = false;
+        self.size = self.max_size;
+        self.desc_table_address = GuestAddress(0);
+        self.avail_ring_address = GuestAddress(0);
+        self.used_ring_address = GuestAddress(0);
+        self.next_avail = Wrapping(0);
+        self.next_used = Wrapping(0);
+        self.num_added = Wrapping(0);
+        self.uses_notif_suppression = false;
+    }
 }
 
 #[cfg(kani)]

src/vmm/src/devices/virtio/queue.rs

@@ -8,6 +8,8 @@ use vmm_sys_util::eventfd::EventFd;
 
 /// MMIO transport for VirtIO devices
 pub mod mmio;
+/// PCI transport for VirtIO devices
+pub mod pci;
 
 /// Represents the types of interrupts used by VirtIO devices
 #[derive(Debug, Clone)]