Optimize Stack and Memory Management

hypervisor/src/global_const.rs

@@ -1,52 +1,15 @@
-/// The default number of logical processors for a high-end desktop system.
-///
-/// This value is set to 1 for testing purposes but can be adjusted up to 64 or more based on the system.
-/// Adjusting this value will increase the total heap size accordingly.
-const DEFAULT_LOGICAL_PROCESSORS: usize = 16;
-
-/// The number of pages for the stack per processor/core.
-///
-/// Each processor/core gets its own stack. The default stack size per processor is calculated as:
-/// STACK_PAGES_PER_PROCESSOR * BASE_PAGE_SIZE (4096 bytes per page)
-/// 0x4000 * 4096 = 67,108,864 bytes (64 MB)
-///
-/// This stack size is allocated individually for each processor.
-pub const STACK_PAGES_PER_PROCESSOR: usize = 0x2000;
-
-/// The size of a page table in bytes.
-const PAGE_TABLE_SIZE: usize = 2 * 1024 * 1024; // 2 MB
-
-/// The total number of page tables needed per processor to split the stack.
-///
-/// This is calculated as:
-/// STACK_SIZE / PAGE_TABLE_SIZE
-/// 64 MB / 2 MB = 32 page tables
-const PAGE_TABLES_PER_PROCESSOR: usize = 32;
-
-/// The padding added to the heap size for other allocations (e.g., vectors, boxes).
-///
-/// This is an additional memory buffer to ensure there's enough space for other dynamic allocations.
-const HEAP_PADDING: usize = 8 * 1024 * 1024; // 8 MB
-
-/// The total size of the heap in bytes, shared among all processors.
-///
-/// This base heap size is for 1 processor, calculated as:
-/// 32 * 2 * 1024 * 1024 + 8 * 1024 * 1024 = 72,237,568 bytes (68 MB)
-///
-/// For 4 processors, the heap size would be:
-/// (32 * 2 * 1024 * 1024 * 4) + 8 * 1024 * 1024 = 288,957,440 bytes (276 MB)
-///
-/// For 8 processors, the heap size would be:
-/// (32 * 2 * 1024 * 1024 * 8) + 8 * 1024 * 1024 = 577,874,944 bytes (552 MB)
-///
-/// For 16 processors, the heap size would be:
-/// (32 * 2 * 1024 * 1024 * 16) + 8 * 1024 * 1024 = 1,155,685,888 bytes (1.08 GB)
-///
-/// For 32 processors, the heap size would be:
-/// (32 * 2 * 1024 * 1024 * 32) + 8 * 1024 * 1024 = 2,311,371,776 bytes (2.16 GB)
-///
-/// For 64 processors, the heap size would be:
-/// (32 * 2 * 1024 * 1024 * 64) + 8 * 1024 * 1024 = 4,622,743,552 bytes (4.32 GB)
-///
-/// By adjusting the number of logical processors, the heap size will scale accordingly.
-pub const TOTAL_HEAP_SIZE: usize = (PAGE_TABLES_PER_PROCESSOR * PAGE_TABLE_SIZE * DEFAULT_LOGICAL_PROCESSORS) + HEAP_PADDING;
+use {crate::intel::vm::Vm, core::mem::size_of};
+
+/// Number of stack pages per logical processor.
+/// Includes size of `Vm` in pages plus 0x1000 (4096) pages for padding.
+/// - Size of `Vm`: 1027 pages (0x403 pages).
+/// - Padding: 4096 pages (0x1000 pages).
+/// - Total: 1027 + 4096 pages = 5123 pages (0x1403 pages).
+/// - Total size in bytes: 5123 * 4096 = 20,971,520 bytes (20 MB).
+pub const STACK_PAGES_PER_PROCESSOR: usize = (size_of::<Vm>() / 0x1000) + 0x1000;
+
+/// Total heap size (64 MB) shared across all logical processors.
+/// - Total size in bytes: 64 * 1024 * 1024 = 67,108,864 bytes (64 MB).
+/// - Total size in hexadecimal: 0x4000000 bytes.
+/// Increase this value if additional heap memory is needed or if more hooks are required.
+pub const TOTAL_HEAP_SIZE: usize = 0x4000000;

hypervisor/src/intel/hooks/hook_manager.rs

@@ -13,13 +13,13 @@ use {
             invvpid::invvpid_all_contexts,
             vm::Vm,
         },
-        tracker::{print_allocated_memory, ALLOCATED_MEMORY_HEAD},
         windows::{
             nt::pe::{get_export_by_hash, get_image_base_address, get_size_of_image},
             ssdt::ssdt_hook::SsdtHook,
         },
     },
-    core::{intrinsics::copy_nonoverlapping, sync::atomic::Ordering},
+    alloc::vec::Vec,
+    core::intrinsics::copy_nonoverlapping,
     lazy_static::lazy_static,
     log::*,
     spin::Mutex,
@@ -66,6 +66,8 @@ pub struct HookManager {
     /// A flag indicating whether the CPUID cache information has been called. This will be used to perform hooks at boot time when SSDT has been initialized.
     /// KiSetCacheInformation -> KiSetCacheInformationIntel -> KiSetStandardizedCacheInformation -> __cpuid(4, 0)
     pub has_cpuid_cache_info_been_called: bool,
+
+    pub stack_memory: Vec<(usize, usize)>,
 }
 
 lazy_static! {
@@ -87,6 +89,7 @@ lazy_static! {
         ntoskrnl_base_pa: 0,
         ntoskrnl_size: 0,
         has_cpuid_cache_info_been_called: false,
+        stack_memory: Vec::with_capacity(128),
     });
 }
 
@@ -109,6 +112,23 @@ impl HookManager {
             .modify_msr_interception(msr::IA32_LSTAR, MsrAccessType::Write, MsrOperation::Hook);
     }
 
+    /// Records a memory allocation for tracking purposes.
+    ///
+    /// # Arguments
+    ///
+    /// * `start` - The start address of the memory allocation.
+    /// * `size` - The size of the memory allocation.
+    pub fn record_allocation(&mut self, start: usize, size: usize) {
+        self.stack_memory.push((start, size));
+    }
+
+    /// Prints the allocated memory ranges for debugging purposes.
+    pub fn print_allocated_memory(&self) {
+        self.stack_memory.iter().for_each(|(start, size)| {
+            debug!("Memory Range: Start = {:#x}, Size = {:#x}", start, size);
+        });
+    }
+
     /// Sets the base address and size of the Windows kernel.
     ///
     /// # Arguments
@@ -197,30 +217,15 @@ impl HookManager {
     ///
     /// Returns `Ok(())` if the hooks were successfully installed, `Err(HypervisorError)` otherwise.
     pub fn hide_hypervisor_memory(&mut self, vm: &mut Vm, page_permissions: AccessType) -> Result<(), HypervisorError> {
-        // Print the tracked memory allocations for debugging purposes.
-        print_allocated_memory();
-
-        // Load the head of the allocated memory list.
-        let mut current_node = ALLOCATED_MEMORY_HEAD.load(Ordering::Acquire);
-
-        // Iterate through the linked list and hide each memory range.
-        while !current_node.is_null() {
-            // Get a reference to the current node.
-            let node = unsafe { &*current_node };
-
-            // Print the memory range.
-            trace!("Memory Range: Start = {:#X}, Size = {}", node.start, node.size);
-
-            // Iterate through the memory range in 4KB steps.
-            for offset in (0..node.size).step_by(BASE_PAGE_SIZE) {
-                let guest_page_pa = node.start + offset;
-                // Print the page address before hiding it.
-                trace!("Hiding memory page at: {:#X}", guest_page_pa);
-                self.ept_hide_hypervisor_memory(vm, PAddr::from(guest_page_pa).align_down_to_base_page().as_u64(), page_permissions)?;
-            }
-
-            // Move to the next node.
-            current_node = node.next.load(Ordering::Acquire);
+        let pages: Vec<u64> = self
+            .stack_memory
+            .iter()
+            .step_by(BASE_PAGE_SIZE)
+            .map(|(start, _size)| *start as u64)
+            .collect();
+
+        for guest_page_pa in pages {
+            self.ept_hide_hypervisor_memory(vm, PAddr::from(guest_page_pa).align_down_to_base_page().as_u64(), page_permissions)?
         }
 
         Ok(())

hypervisor/src/lib.rs

@@ -18,6 +18,5 @@ pub mod error;
 pub mod global_const;
 pub mod intel;
 pub mod logger;
-pub mod tracker;
 pub mod vmm;
 pub mod windows;

hypervisor/src/vmm.rs

@@ -80,10 +80,14 @@ pub fn start_hypervisor(guest_registers: &GuestRegisters) -> ! {
     trace!("VMCS Dump: {:#x?}", vm.vmcs_region);
 
     /*
-    match HookManager::hide_hypervisor_memory(&mut vm, AccessType::READ_WRITE_EXECUTE) {
-        Ok(_) => debug!("Hypervisor memory hidden"),
-        Err(e) => panic!("Failed to hide hypervisor memory: {:?}", e),
-    };
+    {
+        let mut hook_manager =  crate::intel::hooks::hook_manager::SHARED_HOOK_MANAGER.lock();
+        hook_manager.print_allocated_memory();
+        match hook_manager.hide_hypervisor_memory(&mut vm, crate::intel::ept::AccessType::READ_WRITE_EXECUTE) {
+            Ok(_) => debug!("Hypervisor memory hidden"),
+            Err(e) => panic!("Failed to hide hypervisor memory: {:?}", e),
+        };
+    }
      */
 
     info!("Launching the VM until a vmexit occurs...");

uefi/src/setup.rs

@@ -6,8 +6,10 @@ use {
     alloc::boxed::Box,
     hypervisor::{
         allocator::box_zeroed,
-        intel::{hooks::hook_manager::HookManager, page::Page},
-        tracker::record_allocation,
+        intel::{
+            hooks::hook_manager::{HookManager, SHARED_HOOK_MANAGER},
+            page::Page,
+        },
     },
     log::debug,
     uefi::{prelude::BootServices, proto::loaded_image::LoadedImage},
@@ -44,7 +46,10 @@ pub fn record_image_base(loaded_image: &LoadedImage) {
     let (image_base, image_size) = loaded_image.info();
     let image_range = image_base as usize..(image_base as usize + image_size as usize);
     debug!("Loaded image base: {:#x?}", image_range);
-    record_allocation(image_base as usize, image_size as usize);
+
+    // Lock the shared hook manager
+    let mut hook_manager = SHARED_HOOK_MANAGER.lock();
+    hook_manager.record_allocation(image_base as usize, image_size as usize);
 }
 
 /// Creates a dummy page filled with a specific byte value.

uefi/src/stack.rs

@@ -5,7 +5,7 @@ use {
         ptr,
         sync::atomic::{AtomicPtr, AtomicU32, Ordering},
     },
-    hypervisor::tracker::record_allocation,
+    hypervisor::intel::hooks::hook_manager::SHARED_HOOK_MANAGER,
     uefi::{
         prelude::{Boot, BootServices, SystemTable},
         proto::loaded_image::LoadedImage,
@@ -89,8 +89,9 @@ pub unsafe fn allocate_host_stack(layout: Layout) -> *mut u8 {
             .unwrap_or(ptr::null_mut())
     };
 
-    // Record the allocation without causing a deadlock.
-    record_allocation(stack as usize, layout.size());
+    // Lock the shared hook manager
+    let mut hook_manager = SHARED_HOOK_MANAGER.lock();
+    hook_manager.record_allocation(stack as usize, layout.size());
 
     stack
 }