tbs: drop "acpi" memory.

Just adjust the RAM portion. Signed-off-by: Babis Chalios <bchalios@amazon.es>
firecracker-microvm · Jul 18, 2024 · 8539059 · 8539059
1 parent 153851a
commit 8539059
Showing 1 changed file with 7 additions and 11 deletions.
diff --git a/src/vmm/src/arch/aarch64/fdt.rs b/src/vmm/src/arch/aarch64/fdt.rs
@@ -226,17 +226,13 @@ fn create_memory_node(fdt: &mut FdtWriter, guest_mem: &GuestMemoryMmap) -> Resul
     // for an explanation of this.
 
     // On ARM we reserve some memory so that it can be utilized for devices like VMGenID to send
-    // data to kernel drivers. Linux does not allow remapping system memory. However, without
-    // remap, kernel module cannot get virtual addresses to read data from device memory.
-    // Reserving a memory region allows Linux kernel modules to remap and thus read this region.
-    let mem_reg_prop = &[
-        super::layout::DRAM_MEM_START,
-        super::layout::SYSTEM_MEM_SIZE,
-    ];
-    let mem = fdt.begin_node("memory@device")?;
-    fdt.property_array_u64("reg", mem_reg_prop)?;
-    fdt.end_node(mem)?;
-
+    // data to kernel drivers. The range of this memory is:
+    //
+    // [layout::DRAM_MEM_START, layout::DRAM_MEM_START + layout::SYSTEM_MEM_SIZE)
+    //
+    // The reason we do this is that Linux does not allow remapping system memory. However, without
+    // remap, kernel drivers cannot get virtual addresses to read data from device memory. Leaving
+    // this memory region out allows Linux kernel modules to remap and thus read this region.
     let mem_size = guest_mem.last_addr().raw_value()
         - super::layout::DRAM_MEM_START
         - super::layout::SYSTEM_MEM_SIZE