From 668512f585826c8a0bc6fdd4bb478d4383b5304c Mon Sep 17 00:00:00 2001
From: Tom Dohrmann <erbse.13@gmx.de>
Date: Fri, 30 Aug 2024 06:56:24 +0000
Subject: [PATCH] ghcb: remove DerefMut impl

This impl is unused. It is also unsound because we can never have
unique ownership over the GHCB as long as it is shared with the host.

Signed-off-by: Tom Dohrmann <erbse.13@gmx.de>
---
 kernel/src/sev/ghcb.rs | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/kernel/src/sev/ghcb.rs b/kernel/src/sev/ghcb.rs
index e728ec404..34113624d 100644
--- a/kernel/src/sev/ghcb.rs
+++ b/kernel/src/sev/ghcb.rs
@@ -23,7 +23,7 @@ use crate::utils::MemoryRegion;
 use crate::mm::PageBox;
 use core::arch::global_asm;
 use core::mem::{self, offset_of};
-use core::ops::{Deref, DerefMut};
+use core::ops::Deref;
 use core::ptr;
 use core::sync::atomic::{AtomicU16, AtomicU32, AtomicU64, AtomicU8, Ordering};
 
@@ -173,12 +173,6 @@ impl Deref for GhcbPage {
     }
 }
 
-impl DerefMut for GhcbPage {
-    fn deref_mut(&mut self) -> &mut Self::Target {
-        self.0.deref_mut()
-    }
-}
-
 #[repr(C)]
 #[derive(Debug)]
 pub struct GHCB {