feat(snapshot-editor): print saved MSR index/data

The derived Debug of a vcpu's saved_msrs shows only the kvm_msrs
headers, not the entries (a FAM array). Print each saved MSR's index and
data so tooling can read values from a snapshot — e.g. MSR_LSTAR
(entry_SYSCALL_64), used to recover the KASLR image slide of a restored
guest for source-level debugging.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Signed-off-by: Nikita Kalyazin <nikita.kalyazin@e2b.dev>

Author: kalyazin

src/snapshot-editor/src/info.rs

@@ -66,6 +66,13 @@ fn info_vcpu_states(snapshot: &Snapshot<MicrovmState>) -> Result<(), InfoVmState
     for (i, state) in snapshot.data.vcpu_states.iter().enumerate() {
         println!("vcpu {i}:");
         println!("{state:#?}");
+        // The derived Debug of `saved_msrs` only shows the kvm_msrs headers, not
+        // the entries (a FAM array). Print index/data so tooling can read MSR
+        // values (e.g. LSTAR, to recover the KASLR slide from a snapshot).
+        #[cfg(target_arch = "x86_64")]
+        for entry in state.saved_msrs.iter().flat_map(|m| m.as_slice()) {
+            println!("    msr index={:#x} data={:#x}", entry.index, entry.data);
+        }
     }
     Ok(())
 }