vmm: Remove long unnecessary comment in register_msi()

The comment inside register_msi() is unnecessary. The devid field name
is descriptive enough and the fact that we currently present a single
PCIe segment is irrelevant. Remove it.

Signed-off-by: Ilias Stamatis <ilstam@amazon.com>

Author: ilstam

src/vmm/src/vstate/vm.rs

@@ -443,19 +443,6 @@ impl Vm {
         entry.u.msi.data = config.data;
 
         if self.common.fd.check_extension(kvm_ioctls::Cap::MsiDevid) {
-            // According to KVM documentation:
-            // https://docs.kernel.org/virt/kvm/api.html#kvm-set-gsi-routing
-            //
-            // if the capability is set, we need to set the flag and provide a valid unique device
-            // ID. "For PCI, this is usually a BDF identifier in the lower 16 bits".
-            //
-            // The layout of `config.devid` is:
-            //
-            // |---- 16 bits ----|-- 8 bits --|-- 5 bits --|-- 3 bits --|
-            // |      segment    |     bus    |   device   |  function  |
-            //
-            // For the time being, we are using a single PCI segment and a single bus per segment
-            // so just passing config.devid should be fine.
             entry.flags = KVM_MSI_VALID_DEVID;
             entry.u.msi.__bindgen_anon_1.devid = config.devid.into();
         }