From c4f8e4b000c11f53f3277f48aa5190a05dd2e23a Mon Sep 17 00:00:00 2001
From: Wei Liu <liuwe@microsoft.com>
Date: Wed, 9 Dec 2020 15:39:35 +0000
Subject: [PATCH] main: provide a sensible error message when /dev/mshv is
 missing

Signed-off-by: Wei Liu <liuwe@microsoft.com>
---
 src/main.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index a68404977..0859d4184 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -25,7 +25,14 @@ use vmm_sys_util::eventfd::EventFd;
 enum Error {
     #[error("Failed to create API EventFd: {0}")]
     CreateAPIEventFd(#[source] std::io::Error),
-    #[error("Failed to open hypervisor interface (is /dev/kvm available?): {0}")]
+    #[cfg_attr(
+        feature = "kvm",
+        error("Failed to open hypervisor interface (is /dev/kvm available?): {0}")
+    )]
+    #[cfg_attr(
+        feature = "mshv",
+        error("Failed to open hypervisor interface (is /dev/mshv available?): {0}")
+    )]
     CreateHypervisor(#[source] hypervisor::HypervisorError),
     #[error("Failed to start the VMM thread: {0}")]
     StartVMMThread(#[source] vmm::Error),