Manage generic MSI interrupts based on VFIO devices

Support generic MSI interrupts based on VFIO devices, this will be
needed when enabling VFIO device passthrough.

Signed-off-by: Liu Jiang <gerry@linux.alibaba.com>

Author: jiangliu

Cargo.toml

@@ -10,12 +10,15 @@ edition = "2018"
 libc = ">=0.2.39"
 kvm-bindings = { version = "~0", optional = true }
 kvm-ioctls = { version = "~0", optional = true }
+vfio-ioctls = { git = "https://github.com/cloud-hypervisor/vfio-ioctls.git", branch = "dragonball", optional = true }
 vmm-sys-util = "~0"
 
 [features]
 legacy-irq = []
 msi-irq = []
+vfio-msi-irq = []
 kvm-irq = ["kvm-ioctls", "kvm-bindings"]
 kvm-msi-generic = ["msi-irq", "kvm-irq"]
 kvm-legacy-irq = ["legacy-irq", "kvm-irq"]
 kvm-msi-irq = ["kvm-msi-generic"]
+kvm-vfio-msi-irq = ["kvm-msi-generic", "vfio-ioctls", "vfio-msi-irq"]

src/interrupt/kvm/mod.rs

@@ -27,6 +27,11 @@ mod msi_irq;
 #[cfg(feature = "kvm-msi-irq")]
 use self::msi_irq::MsiIrq;
 
+#[cfg(feature = "kvm-vfio-msi-irq")]
+mod vfio_msi_irq;
+#[cfg(feature = "kvm-vfio-msi-irq")]
+use self::vfio_msi_irq::VfioMsiIrq;
+
 /// Maximum number of global interrupt sources.
 pub const MAX_IRQS: InterruptIndex = 1024;
 
@@ -130,6 +135,18 @@ impl KvmIrqManagerObj {
                 self.vmfd.clone(),
                 self.routes.clone(),
             )?)),
+            #[cfg(feature = "kvm-vfio-msi-irq")]
+            InterruptSourceType::VfioMsiIrq(vfio_device, vfio_index) => {
+                Arc::new(Box::new(VfioMsiIrq::new(
+                    base,
+                    count,
+                    self.max_msi_irqs,
+                    self.vmfd.clone(),
+                    self.routes.clone(),
+                    vfio_device,
+                    vfio_index,
+                )?))
+            }
             _ => return Err(Error::from(ErrorKind::InvalidInput)),
         };