Refactor 'run'

Signed-off-by: Ludvig Liljenberg <4257730+ludfjig@users.noreply.github.com>

Author: ludfjig

src/hyperlight_host/src/hypervisor/crashdump.rs

@@ -23,7 +23,6 @@ use elfcore::{
     ReadProcessMemory, ThreadView, VaProtection, VaRegion,
 };
 
-use super::Hypervisor;
 use crate::mem::memory_region::{MemoryRegion, MemoryRegionFlags};
 use crate::{Result, new_error};
 
@@ -262,12 +261,7 @@ impl ReadProcessMemory for GuestMemReader {
 ///
 /// # Returns
 /// * `Result<()>`: Success or error
-pub(crate) fn generate_crashdump(hv: &dyn Hypervisor) -> Result<()> {
-    // Get crash context from hypervisor
-    let ctx = hv
-        .crashdump_context()
-        .map_err(|e| new_error!("Failed to get crashdump context: {:?}", e))?;
-
+pub(crate) fn generate_crashdump(ctx: Option<CrashDumpContext>) -> Result<()> {
     // Get env variable for core dump directory
     let core_dump_dir = std::env::var("HYPERLIGHT_CORE_DUMP_DIR").ok();
 

src/hyperlight_host/src/hypervisor/gdb/arch.rs

@@ -16,9 +16,8 @@ limitations under the License.
 
 //! This file contains architecture specific code for the x86_64
 
-use std::collections::HashMap;
-
 use super::VcpuStopReason;
+use crate::Result;
 
 // Described in Table 6-1. Exceptions and Interrupts at Page 6-13 Vol. 1
 // of Intel 64 and IA-32 Architectures Software Developer's Manual
@@ -51,61 +50,50 @@ pub(crate) const DR6_HW_BP_FLAGS_MASK: u64 = 0x0F << DR6_HW_BP_FLAGS_POS;
 
 /// Determine the reason the vCPU stopped
 /// This is done by checking the DR6 register and the exception id
-/// NOTE: Additional checks are done for the entrypoint, stored hw_breakpoints
-/// and sw_breakpoints to ensure the stop reason is valid with internal state
 pub(crate) fn vcpu_stop_reason(
-    single_step: bool,
     rip: u64,
-    dr6: u64,
     entrypoint: u64,
+    dr6: u64,
     exception: u32,
-    hw_breakpoints: &[u64],
-    sw_breakpoints: &HashMap<u64, [u8; SW_BP_SIZE]>,
-) -> VcpuStopReason {
+) -> Result<VcpuStopReason> {
     if DB_EX_ID == exception {
         // If the BS flag in DR6 register is set, it means a single step
         // instruction triggered the exit
         // Check page 19-4 Vol. 3B of Intel 64 and IA-32
         // Architectures Software Developer's Manual
-        if dr6 & DR6_BS_FLAG_MASK != 0 && single_step {
-            return VcpuStopReason::DoneStep;
+        if dr6 & DR6_BS_FLAG_MASK != 0 {
+            return Ok(VcpuStopReason::DoneStep);
         }
 
         // If any of the B0-B3 flags in DR6 register is set, it means a
         // hardware breakpoint triggered the exit
         // Check page 19-4 Vol. 3B of Intel 64 and IA-32
         // Architectures Software Developer's Manual
-        if DR6_HW_BP_FLAGS_MASK & dr6 != 0 && hw_breakpoints.contains(&rip) {
+        if DR6_HW_BP_FLAGS_MASK & dr6 != 0 {
             if rip == entrypoint {
-                return VcpuStopReason::EntryPointBp;
+                return Ok(VcpuStopReason::EntryPointBp);
             }
-            return VcpuStopReason::HwBp;
+            return Ok(VcpuStopReason::HwBp);
         }
     }
 
-    if BP_EX_ID == exception && sw_breakpoints.contains_key(&rip) {
-        return VcpuStopReason::SwBp;
+    if BP_EX_ID == exception {
+        return Ok(VcpuStopReason::SwBp);
     }
 
     // Log an error and provide internal debugging info
     log::error!(
         r"The vCPU exited because of an unknown reason:
-        single_step: {:?}
         rip: {:?}
         dr6: {:?}
         entrypoint: {:?}
         exception: {:?}
-        hw_breakpoints: {:?}
-        sw_breakpoints: {:?}
         ",
-        single_step,
         rip,
         dr6,
         entrypoint,
         exception,
-        hw_breakpoints,
-        sw_breakpoints,
     );
 
-    VcpuStopReason::Unknown
+    Ok(VcpuStopReason::Unknown)
 }

src/hyperlight_host/src/hypervisor/gdb/hyperv_debug.rs

@@ -16,10 +16,8 @@ limitations under the License.
 
 use std::collections::HashMap;
 
-use windows::Win32::System::Hypervisor::WHV_VP_EXCEPTION_CONTEXT;
-
-use super::arch::{MAX_NO_OF_HW_BP, vcpu_stop_reason};
-use super::{GuestDebug, SW_BP_SIZE, VcpuStopReason};
+use super::arch::MAX_NO_OF_HW_BP;
+use super::{GuestDebug, SW_BP_SIZE};
 use crate::hypervisor::regs::{CommonFpu, CommonRegisters};
 use crate::hypervisor::windows_hypervisor_platform::VMProcessor;
 use crate::hypervisor::wrappers::WHvDebugRegisters;
@@ -52,15 +50,6 @@ impl HypervDebug {
         }
     }
 
-    /// Returns the instruction pointer from the stopped vCPU
-    fn get_instruction_pointer(&self, vcpu_fd: &VMProcessor) -> Result<u64> {
-        let regs = vcpu_fd
-            .regs()
-            .map_err(|e| new_error!("Could not retrieve registers from vCPU: {:?}", e))?;
-
-        Ok(regs.rip)
-    }
-
     /// This method sets the kvm debugreg fields to enable breakpoints at
     /// specific addresses
     ///
@@ -120,42 +109,6 @@ impl HypervDebug {
 
         Ok(())
     }
-
-    /// Get the reason the vCPU has stopped
-    pub(crate) fn get_stop_reason(
-        &mut self,
-        vcpu_fd: &VMProcessor,
-        exception: WHV_VP_EXCEPTION_CONTEXT,
-        entrypoint: u64,
-    ) -> Result<VcpuStopReason> {
-        let rip = self.get_instruction_pointer(vcpu_fd)?;
-        let rip = self.translate_gva(vcpu_fd, rip)?;
-
-        let debug_regs = vcpu_fd
-            .get_debug_regs()
-            .map_err(|e| new_error!("Could not retrieve registers from vCPU: {:?}", e))?;
-
-        // Check if the vCPU stopped because of a hardware breakpoint
-        let reason = vcpu_stop_reason(
-            self.single_step,
-            rip,
-            debug_regs.dr6,
-            entrypoint,
-            exception.ExceptionType as u32,
-            &self.hw_breakpoints,
-            &self.sw_breakpoints,
-        );
-
-        if let VcpuStopReason::EntryPointBp = reason {
-            // In case the hw breakpoint is the entry point, remove it to
-            // avoid hanging here as gdb does not remove breakpoints it
-            // has not set.
-            // Gdb expects the target to be stopped when connected.
-            self.remove_hw_breakpoint(vcpu_fd, entrypoint)?;
-        }
-
-        Ok(reason)
-    }
 }
 
 impl GuestDebug for HypervDebug {

src/hyperlight_host/src/hypervisor/gdb/kvm_debug.rs

@@ -18,12 +18,12 @@ use std::collections::HashMap;
 
 use kvm_bindings::{
     KVM_GUESTDBG_ENABLE, KVM_GUESTDBG_SINGLESTEP, KVM_GUESTDBG_USE_HW_BP, KVM_GUESTDBG_USE_SW_BP,
-    kvm_debug_exit_arch, kvm_guest_debug,
+    kvm_guest_debug,
 };
 use kvm_ioctls::VcpuFd;
 
-use super::arch::{MAX_NO_OF_HW_BP, SW_BP_SIZE, vcpu_stop_reason};
-use super::{GuestDebug, VcpuStopReason};
+use super::GuestDebug;
+use super::arch::{MAX_NO_OF_HW_BP, SW_BP_SIZE};
 use crate::hypervisor::regs::{CommonFpu, CommonRegisters};
 use crate::{HyperlightError, Result, new_error};
 
@@ -59,15 +59,6 @@ impl KvmDebug {
         }
     }
 
-    /// Returns the instruction pointer from the stopped vCPU
-    fn get_instruction_pointer(&self, vcpu_fd: &VcpuFd) -> Result<u64> {
-        let regs = vcpu_fd
-            .get_regs()
-            .map_err(|e| new_error!("Could not retrieve registers from vCPU: {:?}", e))?;
-
-        Ok(regs.rip)
-    }
-
     /// This method sets the kvm debugreg fields to enable breakpoints at
     /// specific addresses
     ///
@@ -106,38 +97,6 @@ impl KvmDebug {
 
         Ok(())
     }
-
-    /// Get the reason the vCPU has stopped
-    pub(crate) fn get_stop_reason(
-        &mut self,
-        vcpu_fd: &VcpuFd,
-        debug_exit: kvm_debug_exit_arch,
-        entrypoint: u64,
-    ) -> Result<VcpuStopReason> {
-        let rip = self.get_instruction_pointer(vcpu_fd)?;
-        let rip = self.translate_gva(vcpu_fd, rip)?;
-
-        // Check if the vCPU stopped because of a hardware breakpoint
-        let reason = vcpu_stop_reason(
-            self.single_step,
-            rip,
-            debug_exit.dr6,
-            entrypoint,
-            debug_exit.exception,
-            &self.hw_breakpoints,
-            &self.sw_breakpoints,
-        );
-
-        if let VcpuStopReason::EntryPointBp = reason {
-            // In case the hw breakpoint is the entry point, remove it to
-            // avoid hanging here as gdb does not remove breakpoints it
-            // has not set.
-            // Gdb expects the target to be stopped when connected.
-            self.remove_hw_breakpoint(vcpu_fd, entrypoint)?;
-        }
-
-        Ok(reason)
-    }
 }
 
 impl GuestDebug for KvmDebug {

src/hyperlight_host/src/hypervisor/gdb/mod.rs

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-mod arch;
+pub(crate) mod arch;
 mod event_loop;
 #[cfg(target_os = "windows")]
 mod hyperv_debug;
@@ -235,7 +235,7 @@ impl DebugMemoryAccess {
 }
 
 /// Defines the possible reasons for which a vCPU can be stopped when debugging
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Eq)]
 pub enum VcpuStopReason {
     Crash,
     DoneStep,

src/hyperlight_host/src/hypervisor/gdb/mshv_debug.rs

@@ -26,8 +26,8 @@ use mshv_bindings::{
 };
 use mshv_ioctls::VcpuFd;
 
-use super::arch::{MAX_NO_OF_HW_BP, SW_BP_SIZE, vcpu_stop_reason};
-use super::{GuestDebug, VcpuStopReason};
+use super::GuestDebug;
+use super::arch::{MAX_NO_OF_HW_BP, SW_BP_SIZE};
 use crate::hypervisor::regs::{CommonFpu, CommonRegisters};
 use crate::{HyperlightError, Result, new_error};
 
@@ -55,15 +55,6 @@ impl MshvDebug {
         }
     }
 
-    /// Returns the instruction pointer from the stopped vCPU
-    fn get_instruction_pointer(&self, vcpu_fd: &VcpuFd) -> Result<u64> {
-        let regs = vcpu_fd
-            .get_regs()
-            .map_err(|e| new_error!("Could not retrieve registers from vCPU: {:?}", e))?;
-
-        Ok(regs.rip)
-    }
-
     /// This method sets the vCPU debug register fields to enable breakpoints at
     /// specific addresses
     ///
@@ -121,44 +112,6 @@ impl MshvDebug {
 
         Ok(())
     }
-
-    /// Returns the vCPU stop reason
-    pub(crate) fn get_stop_reason(
-        &mut self,
-        vcpu_fd: &VcpuFd,
-        exception: u16,
-        entrypoint: u64,
-    ) -> Result<VcpuStopReason> {
-        let regs = vcpu_fd
-            .get_debug_regs()
-            .map_err(|e| new_error!("Cannot retrieve debug registers from vCPU: {}", e))?;
-
-        // DR6 register contains debug state related information
-        let debug_status = regs.dr6;
-
-        let rip = self.get_instruction_pointer(vcpu_fd)?;
-        let rip = self.translate_gva(vcpu_fd, rip)?;
-
-        let reason = vcpu_stop_reason(
-            self.single_step,
-            rip,
-            debug_status,
-            entrypoint,
-            exception as u32,
-            &self.hw_breakpoints,
-            &self.sw_breakpoints,
-        );
-
-        if let VcpuStopReason::EntryPointBp = reason {
-            // In case the hw breakpoint is the entry point, remove it to
-            // avoid hanging here as gdb does not remove breakpoints it
-            // has not set.
-            // Gdb expects the target to be stopped when connected.
-            self.remove_hw_breakpoint(vcpu_fd, entrypoint)?;
-        }
-
-        Ok(reason)
-    }
 }
 
 impl GuestDebug for MshvDebug {