Revert "cpuid: remove unsafe from cpuid methods"

This reverts commit fb42ebf.

Signed-off-by: Sergio Lopez <slp@redhat.com>

Author: slp

src/cpuid/src/brand_string.rs

@@ -104,15 +104,15 @@ impl BrandString {
     /// of the host CPU.
     pub fn from_host_cpuid() -> Result<Self, Error> {
         let mut this = Self::new();
-        let mut cpuid_regs = host_cpuid(0x8000_0000);
+        let mut cpuid_regs = unsafe { host_cpuid(0x8000_0000) };
 
         if cpuid_regs.eax < 0x8000_0004 {
             // Brand string not supported by the host CPU
             return Err(Error::NotSupported);
         }
 
         for leaf in 0x8000_0002..=0x8000_0004 {
-            cpuid_regs = host_cpuid(leaf);
+            cpuid_regs = unsafe { host_cpuid(leaf) };
             this.set_reg_for_leaf(leaf, Reg::EAX, cpuid_regs.eax);
             this.set_reg_for_leaf(leaf, Reg::EBX, cpuid_regs.ebx);
             this.set_reg_for_leaf(leaf, Reg::ECX, cpuid_regs.ecx);

src/cpuid/src/common.rs

@@ -35,15 +35,15 @@ pub fn get_cpuid(function: u32, count: u32) -> Result<CpuidResult, Error> {
     }
 
     // this is safe because the host supports the `cpuid` instruction
-    let max_function = __get_cpuid_max(function & leaf_0x80000000::LEAF_NUM).0;
+    let max_function = unsafe { __get_cpuid_max(function & leaf_0x80000000::LEAF_NUM).0 };
     if function > max_function {
         return Err(Error::InvalidParameters(format!(
             "Function not supported: 0x{function:x}"
         )));
     }
 
     // this is safe because the host supports the `cpuid` instruction
-    let entry = __cpuid_count(function, count);
+    let entry = unsafe { __cpuid_count(function, count) };
     if entry.eax == 0 && entry.ebx == 0 && entry.ecx == 0 && entry.edx == 0 {
         return Err(Error::InvalidParameters(format!("Invalid count: {count}")));
     }