dragonball: introduce pci msi/msix interrupt

introduce msi/msix mod to maintain information for PCI Message Signalled
Interrupt Extended Capability. It will be initialized when parsing pci
configuration space and used when getting interrupt capabilities.

fixes: #8661

Signed-off-by: Gerry Liu <gerry@linux.alibaba.com>
Signed-off-by: Zizheng Bian <zizheng.bian@linux.alibaba.com>
Signed-off-by: Shifang Feng <fengshifang@linux.alibaba.com>
Signed-off-by: Yang Su <yang.su@linux.alibaba.com>
Signed-off-by: Zha Bin <zhabin@linux.alibaba.com>
Signed-off-by: Xin Lin <jingshan@linux.alibaba.com>
Signed-off-by: Chao Wu <chaowu@linux.alibaba.com>

src/dragonball/src/dbs_interrupt/src/lib.rs

@@ -242,3 +242,11 @@ pub trait InterruptSourceGroup: Send + Sync {
         false
     }
 }
+
+impl PartialEq for dyn InterruptSourceGroup {
+    fn eq(&self, other: &dyn InterruptSourceGroup) -> bool {
+        self.interrupt_type() == other.interrupt_type()
+            && self.len() == other.len()
+            && self.base() == other.base()
+    }
+}

src/dragonball/src/dbs_pci/Cargo.toml

@@ -18,3 +18,7 @@ log = "0.4.14"
 downcast-rs = "1.2.0"
 byteorder = "1.4.3"
 thiserror = "1"
+vm-memory = "0.10.0"
+
+[dev-dependencies]
+kvm-ioctls = "0.12.0"

src/dragonball/src/dbs_pci/README.md

@@ -14,4 +14,8 @@ There are several components in `dbs-pci` crate building together to emulate PCI
 
 4. root bus mod: mainly for emulating PCI root bridge and also create the PCI root bus with the given bus ID with the PCI root bridge.
 
-5. root device mod: A pseudo PCI root device to manage accessing to PCI configuration space.
+5. root device mod: a pseudo PCI root device to manage accessing to PCI configuration space.
+
+6. msi mod: struct to maintain information for PCI Message Signalled Interrupt Capability. It will be initialized when parsing pci configuration space and used when getting interrupt capabilities.
+
+7. msix mod: struct to maintain information for PCI Message Signalled Interrupt Extended Capability. It will be initialized when parsing pci configuration space and used when getting interrupt capabilities.

src/dragonball/src/dbs_pci/src/lib.rs

@@ -47,6 +47,9 @@ pub use root_bus::create_pci_root_bus;
 mod root_device;
 pub use root_device::PciRootDevice;
 
+mod msi;
+mod msix;
+
 /// Error codes related to PCI root/bus/device operations.
 #[derive(Debug, thiserror::Error)]
 pub enum Error {