Allow larger quantum value for SMP simulations (up to 32)

Update CHANGES

bochs/CHANGES

@@ -39,6 +39,8 @@ Changes after 2.5.1 release:
   - Added new parameter 'rtc_sync' for the 'clock' option. If this option
     is enabled together with the realtime synchronization, the RTC runs
     at realtime speed.
+  - Allow larger CPU 'quantum' values when emulating SMP systems for speed
+    (quantum values up to 32 are allowed now).
 
 - I/O Devices
   - Networking
@@ -106,6 +108,7 @@ Changes after 2.5.1 release:
   [3486555] Fix critical stack leak in Win32 GUI by Carlo Bramini
 
 - these S.F. bugs were closed/fixed
+  [3550175] Crash when saving snapshot to directory instead of file
   [3548109] VMX State Not Restored After Entering SMM on 32-bit Systems
   [3548108] VMEXIT Instruction Length Not Always Getting Updated
   [3545941] Typo in preprocessor symbol

bochs/config.cc

@@ -389,7 +389,7 @@ void bx_init_options()
       "quantum", "Quantum ticks in SMP simulation",
       "Maximum amount of instructions allowed to execute before returning control to another CPU.",
       BX_SMP_QUANTUM_MIN, BX_SMP_QUANTUM_MAX,
-      5);
+      16);
 #endif
   new bx_param_bool_c(cpu_param,
       "reset_on_triple_fault", "Enable CPU reset on triple fault",

bochs/config.h.in

@@ -151,7 +151,7 @@
 // how many instructions each CPU could execute in one
 // shot (one cpu_loop call)
 #define BX_SMP_QUANTUM_MIN  1
-#define BX_SMP_QUANTUM_MAX 16
+#define BX_SMP_QUANTUM_MAX 32
 
 // Use Static Member Funtions to eliminate 'this' pointer passing
 // If you want the efficiency of 'C', you can make all the

bochs/cpu/proc_ctrl.cc

@@ -151,7 +151,7 @@ BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::HLT(bxInstruction_c *i)
 #if BX_SUPPORT_VMX
   if (BX_CPU_THIS_PTR in_vmx_guest) {
     if (VMEXIT(VMX_VM_EXEC_CTRL2_HLT_VMEXIT)) {
-      BX_ERROR(("VMEXIT: HLT"));
+      BX_DEBUG(("VMEXIT: HLT"));
       VMexit(VMX_VMEXIT_HLT, 0);
     }
   }