test(memory_monitor): exclude snapshot bounce buffer

When taking a snapshot from a Secret Free VM, we create a bounce buffer
to be able to pass it to the host kernel to store in a file.  Exclude it
from the memory monitor calculation.

Signed-off-by: Nikita Kalyazin <[email protected]>

Author: kalyazin

tests/host_tools/memory.py

@@ -93,10 +93,16 @@ def is_guest_mem(self, size, guest_mem_bytes):
         #  - its size matches the guest memory exactly
         #  - its size is 3328M
         #  - its size is guest memory minus 3328M.
-        return size in (
-            guest_mem_bytes,
-            self.X86_MEMORY_GAP_START,
-            guest_mem_bytes - self.X86_MEMORY_GAP_START,
+        # Note: we add a workaround for Secret Free VMs
+        # to also exclude the snapshot bounce buffer VMA from the check.
+        return (
+            size
+            in (
+                guest_mem_bytes,
+                self.X86_MEMORY_GAP_START,
+                guest_mem_bytes - self.X86_MEMORY_GAP_START,
+            )
+            or size > guest_mem_bytes
         )
 
     def check_samples(self):