Changeset 35005 in vbox

Timestamp:

Dec 13, 2010 1:26:48 PM (14 years ago)

Author:

vboxsync

Message:

Fixed massive performance regression for nested paging with 32-bit SMP guests

File:

• trunk/src/VBox/VMM/VMMR0/HWVMXR0.cpp (modified) (1 diff)

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

@@ -3483 +3483 @@
         AssertRC(rc2);
         Log(("VMX_EXIT_EPT_MISCONFIG for %RGp\n", GCPhys));
+
+        /* Shortcut for APIC TPR reads and writes. */
+        if (    (GCPhys & 0xfff) == 0x080
+            &&  GCPhys > 0x1000000   /* to skip VGA frame buffer accesses */
+            &&  fSetupTPRCaching
+            &&  (pVM->hwaccm.s.vmx.msr.vmx_proc_ctls2.n.allowed1 & VMX_VMCS_CTRL_PROC_EXEC2_VIRT_APIC))
+        {
+            RTGCPHYS GCPhysApicBase;
+            PDMApicGetBase(pVM, &GCPhysApicBase);   /* @todo cache this */
+            GCPhysApicBase &= PAGE_BASE_GC_MASK;
+            if (GCPhys == GCPhysApicBase + 0x80)
+            {
+                Log(("Enable VT-x virtual APIC access filtering\n"));
+                rc2 = IOMMMIOMapMMIOHCPage(pVM, GCPhysApicBase, pVM->hwaccm.s.vmx.pAPICPhys, X86_PTE_RW | X86_PTE_P);
+                AssertRC(rc2);
+            }
+        }
 
         rc = PGMR0Trap0eHandlerNPMisconfig(pVM, pVCpu, PGMMODE_EPT, CPUMCTX2CORE(pCtx), GCPhys, UINT32_MAX);