Implement Serialize/Deserialize for kvm_xsave2

They weren't implemented when introduced. They are needed so that Xsave
(i.e. FamStructWrapper<kvm_xsave2>) implements Serialize/Deserialize,
which is needed for snapshot / live migration.

Signed-off-by: Takahiro Itazuri <itazur@amazon.com>

Author: zulinx86

kvm-bindings/CHANGELOG.md

@@ -3,6 +3,8 @@
 
 ### Added
 
+- Implemented `Serialize` / `Deserialize` for `kvm_xsave2`.
+
 ### Changed
 
 ### Removed
@@ -38,7 +40,7 @@
 
 ## [0.8.2]
 
-### Changed 
+### Changed
 
 - Improve performance of bindings deserialization by \~5% by avoiding
   a temporary allocation.
@@ -55,7 +57,7 @@
 ### Added
 
 - An opt-in feature `serde` that enables [`serde`](https://serde.rs)-based
-  (de)serialization of various bindings. 
+  (de)serialization of various bindings.
 
 ## [0.7.0]
 
@@ -80,7 +82,7 @@
 
 ### Added
 
-- Implement `PartialEq` for fam\_wrappers 
+- Implement `PartialEq` for fam\_wrappers
 
 ## [0.5.0]
 

kvm-bindings/src/x86_64/fam_wrappers.rs

@@ -99,6 +99,10 @@ pub type MsrList = FamStructWrapper<kvm_msr_list>;
 /// See also: [`Xsave`].
 #[repr(C)]
 #[derive(Debug, Default)]
+#[cfg_attr(
+    feature = "serde",
+    derive(zerocopy::AsBytes, zerocopy::FromBytes, zerocopy::FromZeroes)
+)]
 pub struct kvm_xsave2 {
     /// The length, in bytes, of the FAM in [`kvm_xsave`].
     ///

kvm-bindings/src/x86_64/serialize.rs

@@ -7,6 +7,7 @@ use bindings::{
     kvm_pit_channel_state, kvm_pit_state2, kvm_regs, kvm_segment, kvm_sregs, kvm_vcpu_events,
     kvm_xcr, kvm_xcrs, kvm_xsave,
 };
+use fam_wrappers::kvm_xsave2;
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
 use zerocopy::{transmute, AsBytes, FromBytes, FromZeroes};
 
@@ -29,6 +30,7 @@ serde_impls!(
     kvm_msrs,
     kvm_cpuid2,
     kvm_xsave,
+    kvm_xsave2,
     kvm_irqchip
 );
 
@@ -118,6 +120,7 @@ mod tests {
         is_serde::<kvm_pit_state2>();
         is_serde::<kvm_vcpu_events>();
         is_serde::<kvm_debugregs>();
+        is_serde::<kvm_xsave2>();
         is_serde::<kvm_xcr>();
         is_serde::<kvm_xcrs>();
         is_serde::<kvm_irqchip>();
@@ -148,6 +151,7 @@ mod tests {
         is_serde_json::<kvm_pit_state2>();
         is_serde_json::<kvm_vcpu_events>();
         is_serde_json::<kvm_debugregs>();
+        is_serde_json::<kvm_xsave2>();
         is_serde_json::<kvm_xcr>();
         is_serde_json::<kvm_xcrs>();
         is_serde_json::<kvm_irqchip>();