hypervisor: mshv: Emulate IrqFd and IOEventFd for mshv module

We don't have IrqFd and IOEventFd support in the kernel for now.
So an emulation layer is needed. In the future, we will be adding this
support in the kernel.

Co-Developed-by: Wei Liu <liuwe@microsoft.com>
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Signed-off-by: Muminul Islam <muislam@microsoft.com>

hypervisor/src/vm.rs

@@ -158,6 +158,11 @@ pub enum HypervisorVmError {
     ///
     #[error("Failed to get dirty log: {0}")]
     GetDirtyLog(#[source] anyhow::Error),
+    ///
+    /// Assert virtual interrupt error
+    ///
+    #[error("Failed to assert virtual Interrupt: {0}")]
+    AsserttVirtualInterrupt(#[source] anyhow::Error),
 }
 ///
 /// Result type for returning from a function