From ef67eab8c353a6f4dc7e1805a60a20e3679831fc Mon Sep 17 00:00:00 2001
From: Yi Wang <foxywang@tencent.com>
Date: Wed, 14 Jun 2023 17:26:09 +0800
Subject: [PATCH] devices: Add support for pvpanic device

Introduce emulation of pvpanic device to allow cloud hypervisor to get
the notify from guest's pvpanic driver when guest kernel crash.

Signed-off-by: Yi Wang <foxywang@tencent.com>
---
 devices/src/lib.rs     |  1 +
 devices/src/pvpanic.rs | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+)
 create mode 100644 devices/src/pvpanic.rs

diff --git a/devices/src/lib.rs b/devices/src/lib.rs
index 1b8b0ca2c..d886ce479 100644
--- a/devices/src/lib.rs
+++ b/devices/src/lib.rs
@@ -19,6 +19,7 @@ pub mod interrupt_controller;
 #[cfg(target_arch = "x86_64")]
 pub mod ioapic;
 pub mod legacy;
+pub mod pvpanic;
 pub mod tpm;
 
 pub use self::acpi::{AcpiGedDevice, AcpiPmTimerDevice, AcpiShutdownDevice};
diff --git a/devices/src/pvpanic.rs b/devices/src/pvpanic.rs
new file mode 100644
index 000000000..0d065bab0
--- /dev/null
+++ b/devices/src/pvpanic.rs
@@ -0,0 +1,24 @@
+// Copyright © 2023 Tencent Corporation
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+const PVPANIC_PANICKED: u8 = 1 << 0;
+const PVPANIC_CRASH_LOADED: u8 = 1 << 1;
+
+/// A device for handling guest panic event
+pub struct PvPanicDevice {
+    _id: String,
+    _events: u8,
+}
+
+impl PvPanicDevice {
+    pub fn new() -> PvPanicDevice {
+        let events = PVPANIC_PANICKED | PVPANIC_CRASH_LOADED;
+
+        PvPanicDevice {
+            _id: String::from("_pvpanic"),
+            _events: events,
+        }
+    }
+}