/* $Id: DBGFR0Tracer.cpp 86683 2020-10-23 09:06:16Z vboxsync $ */ /** @file * DBGF - Debugger Facility, R0 tracing part. */ /* * Copyright (C) 2020 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #define LOG_GROUP LOG_GROUP_DBGF #include "DBGFInternal.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include "dtrace/VBoxVMM.h" /********************************************************************************************************************************* * Internal Functions * *********************************************************************************************************************************/ /** * Used by DBGFR0CleanupVM to destroy a tracer instance. * * This is done during VM cleanup so that we're sure there are no active threads * using the tracer code. * * @param pGVM The global (ring-0) VM structure. * @param pTracer The device instance. */ DECLHIDDEN(void) dbgfR0TracerDestroy(PGVM pGVM, PDBGFTRACERINSR0 pTracer) { RT_NOREF(pGVM); /* * Free the ring-3 mapping and instance memory. */ RTR0MEMOBJ hMemObj = pTracer->hMapObj; pTracer->hMapObj = NIL_RTR0MEMOBJ; RTR0MemObjFree(hMemObj, true); hMemObj = pTracer->hMemObj; pTracer->hMemObj = NIL_RTR0MEMOBJ; RTR0MemObjFree(hMemObj, true); } /** * Worker for DBGFR0TracerCreate that does the actual instantiation. * * Allocates a memory object and divides it up as follows: * @verbatim -------------------------------------- ring-0 tracerins -------------------------------------- page alignment padding -------------------------------------- ring-3 tracerins -------------------------------------- [page alignment padding ] -+ [--------------------------------------] |- Optional, only when raw-mode is enabled. [raw-mode tracerins ] -+ [--------------------------------------] shared tracer data -------------------------------------- @endverbatim * * @returns VBox status code. * @param pGVM The global (ring-0) VM structure. * @param cbRingBuf Size of the ring buffer in bytes. * @param RCPtrMapping The raw-mode context mapping address, NIL_RTGCPTR if * not to include raw-mode. * @param ppTracerInsR3 Where to return the ring-3 tracer instance address. * @thread EMT(0) */ static int dbgfR0TracerCreateWorker(PGVM pGVM, uint32_t cbRingBuf, RTRGPTR RCPtrMapping, PDBGFTRACERINSR3 *ppTracerInsR3) { /* * Figure out how much memory we need and allocate it. */ uint32_t const cbRing0 = RT_ALIGN_32(sizeof(DBGFTRACERINSR0), PAGE_SIZE); uint32_t const cbRing3 = RT_ALIGN_32(sizeof(DBGFTRACERINSR3), RCPtrMapping != NIL_RTRGPTR ? PAGE_SIZE : 64); uint32_t const cbRC = RCPtrMapping != NIL_RTRGPTR ? 0 : RT_ALIGN_32(sizeof(DBGFTRACERINSRC), 64); uint32_t const cbShared = RT_ALIGN_32(sizeof(DBGFTRACERSHARED) + cbRingBuf, 64); uint32_t const offShared = cbRing0 + cbRing3 + cbRC; uint32_t const cbTotal = RT_ALIGN_32(cbRing0 + cbRing3 + cbRC + cbShared, PAGE_SIZE); AssertLogRelMsgReturn(cbTotal <= DBGF_MAX_TRACER_INSTANCE_SIZE, ("Instance of tracer is too big: cbTotal=%u, max %u\n", cbTotal, DBGF_MAX_TRACER_INSTANCE_SIZE), VERR_OUT_OF_RANGE); RTR0MEMOBJ hMemObj; int rc = RTR0MemObjAllocPage(&hMemObj, cbTotal, false /*fExecutable*/); if (RT_FAILURE(rc)) return rc; RT_BZERO(RTR0MemObjAddress(hMemObj), cbTotal); /* Map it. */ RTR0MEMOBJ hMapObj; rc = RTR0MemObjMapUserEx(&hMapObj, hMemObj, (RTR3PTR)-1, 0, RTMEM_PROT_READ | RTMEM_PROT_WRITE, RTR0ProcHandleSelf(), cbRing0, cbTotal - cbRing0); if (RT_SUCCESS(rc)) { PDBGFTRACERINSR0 pTracerIns = (PDBGFTRACERINSR0)RTR0MemObjAddress(hMemObj); struct DBGFTRACERINSR3 *pTracerInsR3 = (struct DBGFTRACERINSR3 *)((uint8_t *)pTracerIns + cbRing0); /* * Initialize the ring-0 instance. */ pTracerIns->pGVM = pGVM; pTracerIns->hMemObj = hMemObj; pTracerIns->hMapObj = hMapObj; pTracerIns->pSharedR0 = (PDBGFTRACERSHARED)((uint8_t *)pTracerIns + offShared); pTracerIns->cbRingBuf = cbRingBuf; pTracerIns->pbRingBufR0 = (uint8_t *)(pTracerIns->pSharedR0 + 1); /* * Initialize the ring-3 instance data as much as we can. * Note! DBGFR3Tracer.cpp does this job for ring-3 only tracers. Keep in sync. */ pTracerInsR3->pVMR3 = pGVM->pVMR3; pTracerInsR3->fR0Enabled = true; pTracerInsR3->pSharedR3 = RTR0MemObjAddressR3(hMapObj) + cbRing3 + cbRC; pTracerInsR3->pbRingBufR3 = RTR0MemObjAddressR3(hMapObj) + cbRing3 + cbRC + sizeof(DBGFTRACERSHARED); pTracerIns->pSharedR0->idEvt = 0; pTracerIns->pSharedR0->cbRingBuf = cbRingBuf; pTracerIns->pSharedR0->fEvtsWaiting = false; pTracerIns->pSharedR0->fFlushThrdActive = false; /* * Initialize the raw-mode instance data as much as possible. */ if (RCPtrMapping != NIL_RTRCPTR) { struct DBGFTRACERINSRC *pTracerInsRC = RCPtrMapping == NIL_RTRCPTR ? NULL : (struct DBGFTRACERINSRC *)((uint8_t *)pTracerIns + cbRing0 + cbRing3); pTracerInsRC->pVMRC = pGVM->pVMRC; } pGVM->dbgfr0.s.pTracerR0 = pTracerIns; /* * We're done. */ *ppTracerInsR3 = RTR0MemObjAddressR3(hMapObj); return rc; } RTR0MemObjFree(hMemObj, true); return rc; } /** * Used by ring-3 DBGF to create a tracer instance that operates both in ring-3 * and ring-0. * * Creates an instance of a tracer (for both ring-3 and ring-0, and optionally * raw-mode context). * * @returns VBox status code. * @param pGVM The global (ring-0) VM structure. * @param pReq Pointer to the request buffer. * @thread EMT(0) */ VMMR0_INT_DECL(int) DBGFR0TracerCreateReqHandler(PGVM pGVM, PDBGFTRACERCREATEREQ pReq) { LogFlow(("DBGFR0TracerCreateReqHandler:\n")); /* * Validate the request. */ AssertReturn(pReq->Hdr.cbReq == sizeof(*pReq), VERR_INVALID_PARAMETER); pReq->pTracerInsR3 = NIL_RTR3PTR; int rc = GVMMR0ValidateGVMandEMT(pGVM, 0); AssertRCReturn(rc, rc); AssertReturn(pReq->cbRingBuf <= DBGF_MAX_TRACER_INSTANCE_SIZE, VERR_OUT_OF_RANGE); return dbgfR0TracerCreateWorker(pGVM, pReq->cbRingBuf, NIL_RTRCPTR /** @todo new raw-mode */, &pReq->pTracerInsR3); }