sev/secrets_page: replace Box with GlobalBox

Use the new fallible-allocation-aware GlobalBox type when allocating
a new secrets page for the given VPML.

Signed-off-by: Carlos López <[email protected]>

kernel/src/sev/secrets_page.rs

@@ -5,13 +5,12 @@
 // Author: Joerg Roedel <[email protected]>
 
 use crate::address::VirtAddr;
+use crate::error::SvsmError;
 use crate::locking::{RWLock, ReadLockGuard, WriteLockGuard};
+use crate::mm::GlobalBox;
 use crate::sev::vmsa::VMPL_MAX;
 use crate::types::GUEST_VMPL;
 
-extern crate alloc;
-use alloc::boxed::Box;
-
 pub const VMPCK_SIZE: usize = 32;
 
 #[derive(Copy, Clone, Debug)]
@@ -73,13 +72,13 @@ impl SecretsPage {
         }
     }
 
-    pub fn copy_for_vmpl(&self, vmpl: usize) -> Box<SecretsPage> {
-        let mut sp = Box::new(*self);
+    pub fn copy_for_vmpl(&self, vmpl: usize) -> Result<GlobalBox<SecretsPage>, SvsmError> {
+        let mut sp = GlobalBox::try_new(*self)?;
         for idx in 0..vmpl {
             sp.clear_vmpck(idx);
         }
 
-        sp
+        Ok(sp)
     }
 
     pub fn set_svsm_data(&mut self, base: u64, size: u64, caa_addr: u64) {

kernel/src/svsm.rs

@@ -125,7 +125,7 @@ fn copy_secrets_page_to_fw(fw_addr: PhysAddr, caa_addr: PhysAddr) -> Result<(),
     zero_mem_region(start, start + PAGE_SIZE);
 
     // Copy secrets page
-    let mut fw_secrets_page = secrets_page().copy_for_vmpl(GUEST_VMPL);
+    let mut fw_secrets_page = secrets_page().copy_for_vmpl(GUEST_VMPL)?;
 
     let &li = &*LAUNCH_INFO;