tdx: Support new way of declaring memory resources

Without breaking the former way of declaring them. This is simply based
on the presence of the GUID TDX Metadata offset. If not present, we
consider the firmware is quite old and therefore we fallback onto the
previous way to expose memory resources.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

vmm/src/vm.rs

@@ -1649,7 +1649,7 @@ impl Vm {
     }
 
     #[cfg(feature = "tdx")]
-    fn extract_tdvf_sections(&mut self) -> Result<Vec<TdvfSection>> {
+    fn extract_tdvf_sections(&mut self) -> Result<(Vec<TdvfSection>, bool)> {
         use arch::x86_64::tdx::*;
 
         let firmware_path = self
@@ -1730,7 +1730,11 @@ impl Vm {
     }
 
     #[cfg(feature = "tdx")]
-    fn populate_tdx_sections(&mut self, sections: &[TdvfSection]) -> Result<Option<u64>> {
+    fn populate_tdx_sections(
+        &mut self,
+        sections: &[TdvfSection],
+        guid_found: bool,
+    ) -> Result<Option<u64>> {
         use arch::x86_64::tdx::*;
         // Get the memory end *before* we start adding TDVF ram regions
         let boot_guest_memory = self
@@ -1868,7 +1872,7 @@ impl Vm {
         sorted_sections.reverse();
 
         for (start, size, ram) in Vm::hob_memory_resources(sorted_sections, &boot_guest_memory) {
-            hob.add_memory_resource(&mem, start, size, ram)
+            hob.add_memory_resource(&mem, start, size, ram, guid_found)
                 .map_err(Error::PopulateHob)?;
         }
 
@@ -2072,17 +2076,17 @@ impl Vm {
         }
 
         #[cfg(feature = "tdx")]
-        let sections = if tdx_enabled {
+        let (sections, guid_found) = if tdx_enabled {
             self.extract_tdvf_sections()?
         } else {
-            Vec::new()
+            (Vec::new(), false)
         };
 
         // Configuring the TDX regions requires that the vCPUs are created.
         #[cfg(feature = "tdx")]
         let hob_address = if tdx_enabled {
             // TDX sections are written to memory.
-            self.populate_tdx_sections(&sections)?
+            self.populate_tdx_sections(&sections, guid_found)?
         } else {
             None
         };