--- /dev/null
+/* $Id: VBoxGuestR0LibGenericRequest.cpp $ */
+/** @file
+ * VBoxGuestLibR0 - Generic VMMDev request management.
+ */
+
+/*
+ * Copyright (C) 2006-2016 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.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+* Header Files *
+*********************************************************************************************************************************/
+#include "VBoxGuestR0LibInternal.h"
+#include <iprt/asm.h>
+#include <iprt/asm-amd64-x86.h>
+#include <iprt/assert.h>
+#include <iprt/string.h>
+
+
+DECLR0VBGL(int) VbglGR0Verify(const VMMDevRequestHeader *pReq, size_t cbReq)
+{
+ size_t cbReqExpected;
+
+ if (RT_UNLIKELY(!pReq || cbReq < sizeof(VMMDevRequestHeader)))
+ {
+ dprintf(("VbglGR0Verify: Invalid parameter: pReq = %p, cbReq = %zu\n", pReq, cbReq));
+ return VERR_INVALID_PARAMETER;
+ }
+
+ if (RT_UNLIKELY(pReq->size > cbReq))
+ {
+ dprintf(("VbglGR0Verify: request size %u > buffer size %zu\n", pReq->size, cbReq));
+ return VERR_INVALID_PARAMETER;
+ }
+
+ /* The request size must correspond to the request type. */
+ cbReqExpected = vmmdevGetRequestSize(pReq->requestType);
+ if (RT_UNLIKELY(cbReq < cbReqExpected))
+ {
+ dprintf(("VbglGR0Verify: buffer size %zu < expected size %zu\n", cbReq, cbReqExpected));
+ return VERR_INVALID_PARAMETER;
+ }
+
+ if (cbReqExpected == cbReq)
+ {
+ /*
+ * This is most likely a fixed size request, and in this case the
+ * request size must be also equal to the expected size.
+ */
+ if (RT_UNLIKELY(pReq->size != cbReqExpected))
+ {
+ dprintf(("VbglGR0Verify: request size %u != expected size %zu\n", pReq->size, cbReqExpected));
+ return VERR_INVALID_PARAMETER;
+ }
+
+ return VINF_SUCCESS;
+ }
+
+ /*
+ * This can be a variable size request. Check the request type and limit the size
+ * to VMMDEV_MAX_VMMDEVREQ_SIZE, which is max size supported by the host.
+ *
+ * Note: Keep this list sorted for easier human lookup!
+ */
+ if ( pReq->requestType == VMMDevReq_ChangeMemBalloon
+#ifdef VBOX_WITH_64_BITS_GUESTS
+ || pReq->requestType == VMMDevReq_HGCMCall32
+ || pReq->requestType == VMMDevReq_HGCMCall64
+#else
+ || pReq->requestType == VMMDevReq_HGCMCall
+#endif
+ || pReq->requestType == VMMDevReq_RegisterSharedModule
+ || pReq->requestType == VMMDevReq_ReportGuestUserState
+ || pReq->requestType == VMMDevReq_LogString
+ || pReq->requestType == VMMDevReq_SetPointerShape
+ || pReq->requestType == VMMDevReq_VideoSetVisibleRegion)
+ {
+ if (RT_UNLIKELY(cbReq > VMMDEV_MAX_VMMDEVREQ_SIZE))
+ {
+ dprintf(("VbglGR0Verify: VMMDevReq_LogString: buffer size %zu too big\n", cbReq));
+ return VERR_BUFFER_OVERFLOW; /** @todo is this error code ok? */
+ }
+ }
+ else
+ {
+ dprintf(("VbglGR0Verify: request size %u > buffer size %zu\n", pReq->size, cbReq));
+ return VERR_IO_BAD_LENGTH; /** @todo is this error code ok? */
+ }
+
+ return VINF_SUCCESS;
+}
+
+DECLR0VBGL(int) VbglR0GRAlloc(VMMDevRequestHeader **ppReq, size_t cbReq, VMMDevRequestType enmReqType)
+{
+ int rc = vbglR0Enter();
+ if (RT_SUCCESS(rc))
+ {
+ if ( ppReq
+ && cbReq >= sizeof(VMMDevRequestHeader)
+ && cbReq == (uint32_t)cbReq)
+ {
+ VMMDevRequestHeader *pReq = (VMMDevRequestHeader *)VbglR0PhysHeapAlloc((uint32_t)cbReq);
+ AssertMsgReturn(pReq, ("VbglR0GRAlloc: no memory (cbReq=%u)\n", cbReq), VERR_NO_MEMORY);
+ memset(pReq, 0xAA, cbReq);
+
+ pReq->size = (uint32_t)cbReq;
+ pReq->version = VMMDEV_REQUEST_HEADER_VERSION;
+ pReq->requestType = enmReqType;
+ pReq->rc = VERR_GENERAL_FAILURE;
+ pReq->reserved1 = 0;
+ pReq->reserved2 = 0;
+
+ *ppReq = pReq;
+ rc = VINF_SUCCESS;
+ }
+ else
+ {
+ dprintf(("VbglR0GRAlloc: Invalid parameter: ppReq=%p cbReq=%u\n", ppReq, cbReq));
+ rc = VERR_INVALID_PARAMETER;
+ }
+ }
+ return rc;
+}
+
+DECLR0VBGL(int) VbglR0GRPerform(VMMDevRequestHeader *pReq)
+{
+ int rc = vbglR0Enter();
+ if (RT_SUCCESS(rc))
+ {
+ if (pReq)
+ {
+ RTCCPHYS PhysAddr = VbglR0PhysHeapGetPhysAddr(pReq);
+ if ( PhysAddr != 0
+ && PhysAddr < _4G) /* Port IO is 32 bit. */
+ {
+ ASMOutU32(g_vbgldata.portVMMDev + VMMDEV_PORT_OFF_REQUEST, (uint32_t)PhysAddr);
+ /* Make the compiler aware that the host has changed memory. */
+ ASMCompilerBarrier();
+ rc = pReq->rc;
+ }
+ else
+ rc = VERR_VBGL_INVALID_ADDR;
+ }
+ else
+ rc = VERR_INVALID_PARAMETER;
+ }
+ return rc;
+}
+
+DECLR0VBGL(void) VbglR0GRFree(VMMDevRequestHeader *pReq)
+{
+ int rc = vbglR0Enter();
+ if (RT_SUCCESS(rc))
+ VbglR0PhysHeapFree(pReq);
+}
+
projects / mirror_ubuntu-bionic-kernel.git / blobdiff