Changeset 15733 in vbox

Timestamp:

Dec 23, 2008 3:13:21 PM (16 years ago)

Author:

vboxsync

Message:

Experiment with the VT-x preemption timer for the 32/64 switcher.

File:

• trunk/src/VBox/VMM/VMMR0/HWVMXR0.cpp (modified) (5 diffs)

trunk/src/VBox/VMM/VMMR0/HWVMXR0.cpp

@@ -2132 +2132 @@
      */
 
+
     /* All done! Let's start VM execution. */
     STAM_PROFILE_ADV_START(&pVCpu->hwaccm.s.StatInGC, z);
@@ -2152 +2153 @@
      * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
      */
-
     STAM_PROFILE_ADV_STOP(&pVCpu->hwaccm.s.StatInGC, z);
     STAM_PROFILE_ADV_START(&pVCpu->hwaccm.s.StatExit1, v);
@@ -3007 +3007 @@
         goto ResumeExecution;
 
+    case VMX_EXIT_PREEMPTION_TIMER:     /* 52 VMX-preemption timer expired. The preemption timer counted down to zero. */
+#ifdef RT_OS_WINDOWS
+        goto ResumeExecution;
+#else
+        break; /* enable interrupts again */
+#endif
+
     default:
         /* The rest is handled after syncing the entire CPU state. */
@@ -3020 +3027 @@
     case VMX_EXIT_EXTERNAL_IRQ:         /* 1 External interrupt. */
     case VMX_EXIT_EPT_VIOLATION:
+    case VMX_EXIT_PREEMPTION_TIMER:     /* 52 VMX-preemption timer expired. The preemption timer counted down to zero. */
         /* Already handled above. */
         break;
@@ -3573 +3581 @@
     aParam[5] = 0;
 
+    if (pVM->hwaccm.s.vmx.msr.vmx_pin_ctls.n.allowed1 & VMX_VMCS_CTRL_PIN_EXEC_CONTROLS_PREEMPT_TIMER)
+    {
+        uint32_t val;
+
+        rc = VMXReadVMCS32(VMX_VMCS_CTRL_PIN_EXEC_CONTROLS, &val);
+        AssertRC(rc);
+        val  = val | VMX_VMCS_CTRL_PIN_EXEC_CONTROLS_PREEMPT_TIMER;
+        rc = VMXWriteVMCS(VMX_VMCS_CTRL_PIN_EXEC_CONTROLS, val);
+        AssertRC(rc);
+
+        VMXWriteVMCS(VMX_VMCS32_GUEST_PREEMPTION_TIMER_VALUE, 0x10000);
+    }
+
     rc = VMXR0Execute64BitsHandler(pVM, pVCpu, pCtx, pVM->hwaccm.s.pfnVMXGCStartVM64, 6, &aParam[0]);
+
+    if (pVM->hwaccm.s.vmx.msr.vmx_pin_ctls.n.allowed1 & VMX_VMCS_CTRL_PIN_EXEC_CONTROLS_PREEMPT_TIMER)
+    {
+        uint32_t val;
+
+        rc = VMXReadVMCS32(VMX_VMCS_CTRL_PIN_EXEC_CONTROLS, &val);
+        AssertRC(rc);
+        val  = val & ~VMX_VMCS_CTRL_PIN_EXEC_CONTROLS_PREEMPT_TIMER;
+        rc = VMXWriteVMCS(VMX_VMCS_CTRL_PIN_EXEC_CONTROLS, val);
+        AssertRC(rc);
+    }
 
 #ifdef DEBUG