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diff --git a/src/VBox/VMM/testcase/tstMicro.h b/src/VBox/VMM/testcase/tstMicro.h
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+/* $Id: tstMicro.h $ */
+/** @file
+ * Micro Testcase, profiling special CPU operations.
+ */
+
+/*
+ * Copyright (C) 2006-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#ifndef VMM_INCLUDED_SRC_testcase_tstMicro_h
+#define VMM_INCLUDED_SRC_testcase_tstMicro_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+/**
+ * The testcase identifier.
+ */
+typedef enum TSTMICROTEST
+{
+    TSTMICROTEST_OVERHEAD = 0,
+    TSTMICROTEST_INVLPG_0,
+    TSTMICROTEST_INVLPG_EIP,
+    TSTMICROTEST_INVLPG_ESP,
+    TSTMICROTEST_CR3_RELOAD,
+    TSTMICROTEST_WP_DISABLE,
+    TSTMICROTEST_WP_ENABLE,
+
+    TSTMICROTEST_TRAP_FIRST,
+    TSTMICROTEST_PF_R0 = TSTMICROTEST_TRAP_FIRST,
+    TSTMICROTEST_PF_R1,
+    TSTMICROTEST_PF_R2,
+    TSTMICROTEST_PF_R3,
+
+    /** The max testcase. */
+    TSTMICROTEST_MAX
+} TSTMICROTEST;
+
+
+/**
+ *
+ */
+typedef struct TSTMICRORESULT
+{
+    /** The total number of ticks spent executing the testcase.
+     * This may include extra overhead stuff if we're weird stuff during trap handler. */
+    uint64_t    cTotalTicks;
+    /** Number of ticks spent getting into Rx from R0.
+     * This will include time spent setting up the testcase in R3. */
+    uint64_t    cToRxFirstTicks;
+    /** Number of ticks spent executing the trap.
+     * I.e. from right before trapping instruction to the start of  the trap handler.
+     * This does not apply to testcases which doesn't trap. */
+    uint64_t    cTrapTicks;
+    /** Number of ticks spent resuming Rx executing after a trap.
+    * This does not apply to testcases which doesn't trap. */
+    uint64_t    cToRxTrapTicks;
+    /** Number of ticks to get to back to r0 after resuming the trapped code.
+     * This does not apply to testcases which doesn't trap. */
+    uint64_t    cToR0Ticks;
+} TSTMICRORESULT, *PTSTMICRORESULT;
+
+/**
+ * Micro profiling testcase
+ */
+typedef struct TSTMICRO
+{
+    /** The RC address of this structure. */
+    RTRCPTR     RCPtr;
+    /** Just for proper alignment. */
+    RTRCPTR     RCPtrStack;
+
+    /** TSC sampled right before leaving R0. */
+    uint64_t    u64TSCR0Start;
+    /** TSC sampled right before the exception. */
+    uint64_t    u64TSCRxStart;
+    /** TSC sampled right after entering the trap handler. */
+    uint64_t    u64TSCR0Enter;
+    /** TSC sampled right before exitting the trap handler. */
+    uint64_t    u64TSCR0Exit;
+    /** TSC sampled right after resuming guest trap. */
+    uint64_t    u64TSCRxEnd;
+    /** TSC sampled right after re-entering R0. */
+    uint64_t    u64TSCR0End;
+    /** Number of times entered (should be one). */
+    uint32_t    cHits;
+    /** Advance EIP. */
+    int32_t     offEIPAdd;
+    /** The last CR3 code. */
+    uint32_t    u32CR2;
+    /** The last error code. */
+    uint32_t    u32ErrCd;
+    /** The last trap eip. */
+    uint32_t    u32EIP;
+    /** The original IDT address and limit. */
+    VBOXIDTR    OriginalIDTR;
+    /** Our IDT. */
+    VBOXIDTE    aIDT[256];
+
+    /** The overhead for the rdtsc + 2 xchg instr. */
+    uint64_t    u64Overhead;
+
+    /** The testresults. */
+    TSTMICRORESULT  aResults[TSTMICROTEST_MAX];
+    /** Ring-3 stack. */
+    uint8_t     au8Stack[4096];
+
+} TSTMICRO, *PTSTMICRO;
+
+
+RT_C_DECLS_BEGIN
+
+DECLASM(void) idtOnly42(PTSTMICRO pTst);
+
+
+DECLASM(void) tstOverhead(PTSTMICRO pTst);
+DECLASM(void) tstInvlpg0(PTSTMICRO pTst);
+DECLASM(void) tstInvlpgEIP(PTSTMICRO pTst);
+DECLASM(void) tstInvlpgESP(PTSTMICRO pTst);
+DECLASM(void) tstCR3Reload(PTSTMICRO pTst);
+DECLASM(void) tstWPEnable(PTSTMICRO pTst);
+DECLASM(void) tstWPDisable(PTSTMICRO pTst);
+
+
+DECLASM(int)  tstPFR0(PTSTMICRO pTst);
+DECLASM(int)  tstPFR1(PTSTMICRO pTst);
+DECLASM(int)  tstPFR2(PTSTMICRO pTst);
+DECLASM(int)  tstPFR3(PTSTMICRO pTst);
+
+
+
+DECLASM(void) tstTrapHandlerNoErr(void);
+DECLASM(void) tstTrapHandler(void);
+DECLASM(void) tstInterrupt42(void);
+
+RT_C_DECLS_END
+
+#endif /* !VMM_INCLUDED_SRC_testcase_tstMicro_h */