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vmm: Implement GDB event handler to enable --gdb flag

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This commit adds event fds and the event handler to send/receive
requests and responses from the GDB thread. It also adds `--gdb` flag to
enable GDB stub feature.

Signed-off-by: Akira Moroo <retrage01@gmail.com>
This commit is contained in:
Akira Moroo
2022-02-20 12:51:34 +09:00
committed by Rob Bradford
parent 23bb629241
commit 2451c4d833
6 changed files with 217 additions and 5 deletions
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vmm/src/cpu.rs
+18 -1
View File
@@ -14,7 +14,7 @@
use crate::config::CpusConfig;
use crate::device_manager::DeviceManager;
#[cfg(feature = "gdb")]
use crate::gdb::{Debuggable, DebuggableError};
use crate::gdb::{get_raw_tid, Debuggable, DebuggableError};
use crate::memory_manager::MemoryManager;
use crate::seccomp_filters::{get_seccomp_filter, Thread};
#[cfg(target_arch = "x86_64")]
@@ -405,6 +405,8 @@ pub struct CpuManager {
exit_evt: EventFd,
#[cfg_attr(target_arch = "aarch64", allow(dead_code))]
reset_evt: EventFd,
#[cfg(feature = "gdb")]
vm_debug_evt: EventFd,
vcpu_states: Vec<VcpuState>,
selected_cpu: u8,
vcpus: Vec<Arc<Mutex<Vcpu>>>,
@@ -557,6 +559,7 @@ impl CpuManager {
vm: Arc<dyn hypervisor::Vm>,
exit_evt: EventFd,
reset_evt: EventFd,
#[cfg(feature = "gdb")] vm_debug_evt: EventFd,
hypervisor: Arc<dyn hypervisor::Hypervisor>,
seccomp_action: SeccompAction,
vmmops: Arc<dyn VmmOps>,
@@ -635,6 +638,8 @@ impl CpuManager {
vcpu_states,
exit_evt,
reset_evt,
#[cfg(feature = "gdb")]
vm_debug_evt,
selected_cpu: 0,
vcpus: Vec::with_capacity(usize::from(config.max_vcpus)),
seccomp_action,
@@ -773,6 +778,8 @@ impl CpuManager {
) -> Result<()> {
let reset_evt = self.reset_evt.try_clone().unwrap();
let exit_evt = self.exit_evt.try_clone().unwrap();
#[cfg(feature = "gdb")]
let vm_debug_evt = self.vm_debug_evt.try_clone().unwrap();
let panic_exit_evt = self.exit_evt.try_clone().unwrap();
let vcpu_kill_signalled = self.vcpus_kill_signalled.clone();
let vcpu_pause_signalled = self.vcpus_pause_signalled.clone();
@@ -904,6 +911,16 @@ impl CpuManager {
// vcpu.run() returns false on a triple-fault so trigger a reset
match vcpu.run() {
Ok(run) => match run {
#[cfg(all(target_arch = "x86_64", feature = "kvm"))]
VmExit::Debug => {
info!("VmExit::Debug");
#[cfg(feature = "gdb")]
{
vcpu_pause_signalled.store(true, Ordering::SeqCst);
let raw_tid = get_raw_tid(vcpu_id as usize);
vm_debug_evt.write(raw_tid as u64).unwrap();
}
}
#[cfg(target_arch = "x86_64")]
VmExit::IoapicEoi(vector) => {
if let Some(interrupt_controller) =