Add Vm trait, implement for kvm, mshv, whp

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

Fix interrupt

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

Fix gdb bug

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

Author: ludfjig

src/hyperlight_host/src/hypervisor/crashdump.rs

@@ -23,7 +23,7 @@ use elfcore::{
     ReadProcessMemory, ThreadView, VaProtection, VaRegion,
 };
 
-use super::Hypervisor;
+use crate::hypervisor::hyperlight_vm::HyperlightVm;
 use crate::mem::memory_region::{MemoryRegion, MemoryRegionFlags};
 use crate::{Result, new_error};
 
@@ -262,7 +262,7 @@ impl ReadProcessMemory for GuestMemReader {
 ///
 /// # Returns
 /// * `Result<()>`: Success or error
-pub(crate) fn generate_crashdump(hv: &dyn Hypervisor) -> Result<()> {
+pub(crate) fn generate_crashdump(hv: &HyperlightVm) -> Result<()> {
     // Get crash context from hypervisor
     let ctx = hv
         .crashdump_context()
@@ -349,28 +349,23 @@ fn core_dump_file_path(dump_dir: Option<String>) -> String {
 /// Returns:
 /// * `Result<usize>`: The number of bytes written to the core dump file.
 fn checked_core_dump(
-    ctx: Option<CrashDumpContext>,
+    ctx: CrashDumpContext,
     get_writer: impl FnOnce() -> Result<Box<dyn Write>>,
 ) -> Result<usize> {
-    let mut nbytes = 0;
-    // If the HV returned a context it means we can create a core dump
-    // This is the case when the sandbox has been configured at runtime to allow core dumps
-    if let Some(ctx) = ctx {
-        log::info!("Creating core dump file...");
-
-        // Set up data sources for the core dump
-        let guest_view = GuestView::new(&ctx);
-        let memory_reader = GuestMemReader::new(&ctx);
-
-        // Create and write core dump
-        let core_builder = CoreDumpBuilder::from_source(guest_view, memory_reader);
-
-        let writer = get_writer()?;
-        // Write the core dump directly to the file
-        nbytes = core_builder
-            .write(writer)
-            .map_err(|e| new_error!("Failed to write core dump: {:?}", e))?;
-    }
+    log::info!("Creating core dump file...");
+
+    // Set up data sources for the core dump
+    let guest_view = GuestView::new(&ctx);
+    let memory_reader = GuestMemReader::new(&ctx);
+
+    // Create and write core dump
+    let core_builder = CoreDumpBuilder::from_source(guest_view, memory_reader);
+
+    let writer = get_writer()?;
+    // Write the core dump directly to the file
+    let nbytes = core_builder
+        .write(writer)
+        .map_err(|e| new_error!("Failed to write core dump: {:?}", e))?;
 
     Ok(nbytes)
 }
@@ -424,17 +419,6 @@ mod test {
         assert!(path.starts_with(&temp_dir));
     }
 
-    /// Test core is not created when the context is None
-    #[test]
-    fn test_crashdump_not_created_when_context_is_none() {
-        // Call the function with None context
-        let result = checked_core_dump(None, || Ok(Box::new(std::io::empty())));
-
-        // Check if the result is ok and the number of bytes is 0
-        assert!(result.is_ok());
-        assert_eq!(result.unwrap(), 0);
-    }
-
     /// Test the core dump creation with no regions fails
     #[test]
     fn test_crashdump_write_fails_when_no_regions() {
@@ -451,7 +435,7 @@ mod test {
         let get_writer = || Ok(Box::new(std::io::empty()) as Box<dyn Write>);
 
         // Call the function
-        let result = checked_core_dump(Some(ctx), get_writer);
+        let result = checked_core_dump(ctx, get_writer);
 
         // Check if the result is an error
         // This should fail because there are no regions
@@ -482,7 +466,7 @@ mod test {
         let get_writer = || Ok(Box::new(std::io::empty()) as Box<dyn Write>);
 
         // Call the function
-        let result = checked_core_dump(Some(ctx), get_writer);
+        let result = checked_core_dump(ctx, get_writer);
 
         // Check if the result is ok and the number of bytes is 0
         assert!(result.is_ok());

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

@@ -16,16 +16,17 @@ limitations under the License.
 
 //! This file contains architecture specific code for the x86_64
 
-use std::collections::HashMap;
-
 use super::VcpuStopReason;
+use crate::Result;
+use crate::hypervisor::regs::CommonRegisters;
+use crate::hypervisor::vm::Vm;
 
 // 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
 /// Exception id for #DB
-const DB_EX_ID: u32 = 1;
+pub(crate) const DB_EX_ID: u32 = 1;
 /// Exception id for #BP - triggered by the INT3 instruction
-const BP_EX_ID: u32 = 3;
+pub(crate) const BP_EX_ID: u32 = 3;
 
 /// Software Breakpoint size in memory
 pub(crate) const SW_BP_SIZE: usize = 1;
@@ -51,61 +52,52 @@ 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,
+    vm: &mut dyn Vm,
     entrypoint: u64,
+    dr6: u64,
     exception: u32,
-    hw_breakpoints: &[u64],
-    sw_breakpoints: &HashMap<u64, [u8; SW_BP_SIZE]>,
-) -> VcpuStopReason {
+) -> Result<VcpuStopReason> {
+    let CommonRegisters { rip, .. } = vm.regs()?;
     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;
+                vm.remove_hw_breakpoint(entrypoint)?;
+                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)
 }