Bump version to v1.1.1

- Fix .vmsn hang: use mmap instead of fs::read for metadata parsing,
  avoiding multi-GB allocation on embedded memory snapshots
- Reduce EPT scan budget (4GB cap, 1GB gap limit) for faster bail-out
  on non-VBS VMs (70s → 10s on 16GB snapshot)

Author: nikaiw

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "vmkatz"
-version = "1.1.0"
+version = "1.1.1"
 edition = "2021"
 license = "MIT"
 

Cargo.toml

@@ -340,15 +340,16 @@ pub fn find_ept_candidates<P: PhysicalMemory>(l1: &P) -> Result<Vec<EptCandidate
     // Scan budget: if no candidates found after scanning a portion of L1, give up.
     // EPT PML4 tables are placed by the hypervisor in the lower portion of L1 memory.
     // For genuine VBS VMs, candidates appear within the first few GB.
-    // Small VMs (<2GB) can't run VBS, so reduce budget to 25%.
+    // Cap at 4GB — scanning more is wasteful since EPTs live in low memory.
+    const MAX_SCAN_BUDGET: u64 = 4 * 1024 * 1024 * 1024;
     let scan_budget = if l1_size < 2 * 1024 * 1024 * 1024 {
         l1_size / 4
     } else {
-        l1_size / 2
+        (l1_size / 4).min(MAX_SCAN_BUDGET)
     };
     let mut pages_since_last_candidate: u64 = 0;
-    // Also give up if we've scanned 2M pages (8GB) without finding a candidate.
-    const PAGES_WITHOUT_CANDIDATE_LIMIT: u64 = 2_000_000;
+    // Give up if we've scanned 256K pages (1GB) without finding a candidate.
+    const PAGES_WITHOUT_CANDIDATE_LIMIT: u64 = 256_000;
 
     let mut addr: u64 = 0;
     while addr < l1_size {

src/paging/ept.rs

@@ -166,7 +166,10 @@ impl VmwareLayer {
 
     /// Parse a .vmsn file and return (regions, tags).
     fn parse_vmsn_metadata(vmsn_path: &Path) -> Result<(Vec<MemoryRegion>, Vec<Tag>)> {
-        let vmsn_data = fs::read(vmsn_path)?;
+        // Memory-map instead of fs::read to avoid loading the entire multi-GB
+        // snapshot into memory — only the header/tag pages get paged in.
+        let vmsn_file = fs::File::open(vmsn_path)?;
+        let vmsn_data = unsafe { Mmap::map(&vmsn_file)? };
 
         let (hdr, groups) = header::parse_vmsn(&vmsn_data)?;
         log::info!(