From d73971e407fa3d4c6a80eb69322fa627ca069a68 Mon Sep 17 00:00:00 2001
From: Wei Liu <liuwe@microsoft.com>
Date: Mon, 7 Sep 2020 10:10:58 +0000
Subject: [PATCH] hypervisor: kvm: check API compatibility

Signed-off-by: Wei Liu <liuwe@microsoft.com>
---
 hypervisor/src/hypervisor.rs | 5 +++++
 hypervisor/src/kvm/mod.rs    | 6 ++++++
 2 files changed, 11 insertions(+)

diff --git a/hypervisor/src/hypervisor.rs b/hypervisor/src/hypervisor.rs
index 055a3db64..4fcceae71 100644
--- a/hypervisor/src/hypervisor.rs
+++ b/hypervisor/src/hypervisor.rs
@@ -55,6 +55,11 @@ pub enum HypervisorError {
     ///
     #[error("Failed to get the list of supported MSRs: {0}")]
     GetMsrList(#[source] anyhow::Error),
+    ///
+    /// API version is not compatible
+    ///
+    #[error("Incompatible API version")]
+    IncompatibleApiVersion,
 }
 
 ///
diff --git a/hypervisor/src/kvm/mod.rs b/hypervisor/src/kvm/mod.rs
index f06a5046b..2efc75402 100644
--- a/hypervisor/src/kvm/mod.rs
+++ b/hypervisor/src/kvm/mod.rs
@@ -345,6 +345,12 @@ impl KvmHypervisor {
     /// Create a hypervisor based on Kvm
     pub fn new() -> hypervisor::Result<KvmHypervisor> {
         let kvm_obj = Kvm::new().map_err(|e| hypervisor::HypervisorError::VmCreate(e.into()))?;
+        let api_version = kvm_obj.get_api_version();
+
+        if api_version != kvm_bindings::KVM_API_VERSION as i32 {
+            return Err(hypervisor::HypervisorError::IncompatibleApiVersion);
+        }
+
         Ok(KvmHypervisor { kvm: kvm_obj })
     }
 }