From 9f111388c0ef96fc3a16a9490a12056533d4e583 Mon Sep 17 00:00:00 2001
From: Akira Moroo <retrage01@gmail.com>
Date: Sun, 30 Jan 2022 19:26:32 +0900
Subject: [PATCH] hypervisor: Add `VmExit::Debug` for x86/KVM

This commit adds `VmExit::Debug` for x86/KVM. When the guest hits a
hardware breakpoint, `VcpuExit::Debug` vm exit occurs. This vm exit
will be handled with code implemented in the following commits.

Signed-off-by: Akira Moroo <retrage01@gmail.com>
---
 hypervisor/src/cpu.rs     | 2 ++
 hypervisor/src/kvm/mod.rs | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/hypervisor/src/cpu.rs b/hypervisor/src/cpu.rs
index 8b57269a2..96b8cfabf 100644
--- a/hypervisor/src/cpu.rs
+++ b/hypervisor/src/cpu.rs
@@ -266,6 +266,8 @@ pub enum VmExit<'a> {
     Hyperv,
     #[cfg(feature = "tdx")]
     Tdx,
+    #[cfg(feature = "kvm")]
+    Debug,
 }
 
 ///
diff --git a/hypervisor/src/kvm/mod.rs b/hypervisor/src/kvm/mod.rs
index d272c7657..14a39ba8c 100644
--- a/hypervisor/src/kvm/mod.rs
+++ b/hypervisor/src/kvm/mod.rs
@@ -1074,6 +1074,8 @@ impl cpu::Vcpu for KvmVcpu {
                 VcpuExit::Hyperv => Ok(cpu::VmExit::Hyperv),
                 #[cfg(feature = "tdx")]
                 VcpuExit::Unsupported(KVM_EXIT_TDX) => Ok(cpu::VmExit::Tdx),
+                VcpuExit::Debug(_) => Ok(cpu::VmExit::Debug),
+
                 r => Err(cpu::HypervisorCpuError::RunVcpu(anyhow!(
                     "Unexpected exit reason on vcpu run: {:?}",
                     r