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Message-Id: <1329267955-32367-14-git-send-email-astiegmann@vmware.com>
Date: Tue, 14 Feb 2012 17:05:54 -0800
From: "Andrew Stiegmann (stieg)" <astiegmann@...are.com>
To: linux-kernel@...r.kernel.org
Cc: vm-crosstalk@...are.com, dtor@...are.com, cschamp@...are.com,
"Andrew Stiegmann (stieg)" <astiegmann@...are.com>
Subject: [PATCH 13/14] Add main driver and kernel interface file
---
drivers/misc/vmw_vmci/driver.c | 2352 ++++++++++++++++++++++++++++++++++
drivers/misc/vmw_vmci/vmciKernelIf.c | 1351 +++++++++++++++++++
2 files changed, 3703 insertions(+), 0 deletions(-)
create mode 100644 drivers/misc/vmw_vmci/driver.c
create mode 100644 drivers/misc/vmw_vmci/vmciKernelIf.c
diff --git a/drivers/misc/vmw_vmci/driver.c b/drivers/misc/vmw_vmci/driver.c
new file mode 100644
index 0000000..ea9dc90
--- /dev/null
+++ b/drivers/misc/vmw_vmci/driver.c
@@ -0,0 +1,2352 @@
+/*
+ *
+ * VMware VMCI Driver
+ *
+ * Copyright (C) 2012 VMware, Inc. All rights reserved.
+ *
+ * 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 version 2 and no later version.
+ *
+ * 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <asm/atomic.h>
+#include <asm/io.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/highmem.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/mutex.h>
+#include <linux/pci.h>
+#include <linux/poll.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/version.h>
+
+#include "vmci_defs.h"
+#include "vmci_handle_array.h"
+#include "vmci_infrastructure.h"
+#include "vmci_iocontrols.h"
+#include "vmci_kernel_if.h"
+#include "vmciCommonInt.h"
+#include "vmciContext.h"
+#include "vmciDatagram.h"
+#include "vmciDoorbell.h"
+#include "vmciDriver.h"
+#include "vmciEvent.h"
+#include "vmciKernelAPI.h"
+#include "vmciQueuePair.h"
+#include "vmciResource.h"
+
+#define LGPFX "VMCI: "
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * PCI Device interface --
+ *
+ * Declarations of types and functions related to the VMCI PCI
+ * device personality.
+ *
+ *
+ *----------------------------------------------------------------------
+ */
+
+/*
+ * VMCI PCI driver state
+ */
+
+struct vmci_device {
+ struct mutex lock;
+
+ unsigned int ioaddr;
+ unsigned int ioaddr_size;
+ unsigned int irq;
+ unsigned int intr_type;
+ bool exclusive_vectors;
+ struct msix_entry msix_entries[VMCI_MAX_INTRS];
+
+ bool enabled;
+ spinlock_t dev_spinlock;
+ atomic_t datagrams_allowed;
+};
+
+static const struct pci_device_id vmci_ids[] = {
+ {PCI_DEVICE(PCI_VENDOR_ID_VMWARE, PCI_DEVICE_ID_VMWARE_VMCI),},
+ {0},
+};
+
+static int vmci_probe_device(struct pci_dev *pdev,
+ const struct pci_device_id *id);
+
+static void vmci_remove_device(struct pci_dev *pdev);
+
+static struct pci_driver vmci_driver = {
+ .name = "vmci",
+ .id_table = vmci_ids,
+ .probe = vmci_probe_device,
+ .remove = __devexit_p(vmci_remove_device),
+};
+
+static struct vmci_device vmci_dev;
+static int vmci_disable_host = 0;
+static int vmci_disable_guest = 0;
+static int vmci_disable_msi;
+static int vmci_disable_msix = 0;
+
+/*
+ * Allocate a buffer for incoming datagrams globally to avoid repeated
+ * allocation in the interrupt handler's atomic context.
+ */
+
+static uint8_t *data_buffer = NULL;
+static uint32_t data_buffer_size = VMCI_MAX_DG_SIZE;
+
+/*
+ * If the VMCI hardware supports the notification bitmap, we allocate
+ * and register a page with the device.
+ */
+
+static uint8_t *notification_bitmap = NULL;
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Host device node interface --
+ *
+ * Implements VMCI by implementing open/close/ioctl functions
+ *
+ *
+ *----------------------------------------------------------------------
+ */
+
+/*
+ * Per-instance host state
+ */
+struct vmci_linux {
+ struct vmci_context *context;
+ int userVersion;
+ VMCIObjType ctType;
+ struct mutex lock;
+};
+
+/*
+ * Static driver state.
+ */
+struct vmci_linux_state {
+ int major;
+ int minor;
+ struct miscdevice misc;
+ char deviceName[32];
+ char buf[1024];
+ atomic_t activeContexts;
+};
+
+static struct vmci_linux_state linuxState;
+
+static int VMCISetupNotify(struct vmci_context *context, uintptr_t notifyUVA);
+
+static void VMCIUnsetNotifyInt(struct vmci_context *context, bool useLock);
+
+static int LinuxDriver_Open(struct inode *inode, struct file *filp);
+
+static long LinuxDriver_UnlockedIoctl(struct file *filp,
+ u_int iocmd, unsigned long ioarg);
+
+static int LinuxDriver_Close(struct inode *inode, struct file *filp);
+
+static unsigned int LinuxDriverPoll(struct file *file, poll_table * wait);
+
+static struct file_operations vmuser_fops;
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Shared VMCI device definitions --
+ *
+ * Types and variables shared by both host and guest personality
+ *
+ *
+ *----------------------------------------------------------------------
+ */
+
+static bool guestDeviceInit;
+static atomic_t guestDeviceActive;
+static bool hostDeviceInit;
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * vmci_host_init --
+ *
+ * Initializes the VMCI host device driver.
+ *
+ * Results:
+ * 0 on success, other error codes on failure.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+int vmci_host_init(void)
+{
+ int retval;
+
+ if (VMCI_HostInit() < VMCI_SUCCESS) {
+ return -ENOMEM;
+ }
+
+ /*
+ * Initialize the file_operations structure. Because this code is always
+ * compiled as a module, this is fine to do it here and not in a static
+ * initializer.
+ */
+
+ memset(&vmuser_fops, 0, sizeof vmuser_fops);
+ vmuser_fops.owner = THIS_MODULE;
+ vmuser_fops.poll = LinuxDriverPoll;
+ vmuser_fops.unlocked_ioctl = LinuxDriver_UnlockedIoctl;
+ vmuser_fops.compat_ioctl = LinuxDriver_UnlockedIoctl;
+ vmuser_fops.open = LinuxDriver_Open;
+ vmuser_fops.release = LinuxDriver_Close;
+
+ sprintf(linuxState.deviceName, "vmci");
+ linuxState.major = 10;
+ linuxState.misc.minor = MISC_DYNAMIC_MINOR;
+ linuxState.misc.name = linuxState.deviceName;
+ linuxState.misc.fops = &vmuser_fops;
+ atomic_set(&linuxState.activeContexts, 0);
+
+ retval = misc_register(&linuxState.misc);
+
+ if (retval) {
+ printk(KERN_WARNING LGPFX "Module registration error "
+ "(name=%s,major=%d,minor=%d,err=%d).\n",
+ linuxState.deviceName, -retval, linuxState.major,
+ linuxState.minor);
+ VMCI_HostCleanup();
+ } else {
+ linuxState.minor = linuxState.misc.minor;
+ printk(KERN_INFO LGPFX
+ "Module registered (name=%s,major=%d,"
+ "minor=%d).\n", linuxState.deviceName,
+ linuxState.major, linuxState.minor);
+ }
+
+ return retval;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * LinuxDriver_Open --
+ *
+ * Called on open of /dev/vmci.
+ *
+ * Side effects:
+ * Increment use count used to determine eventual deallocation of
+ * the module
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int LinuxDriver_Open(struct inode *inode, // IN
+ struct file *filp) // IN
+{
+ struct vmci_linux *vmciLinux;
+
+ vmciLinux = kmalloc(sizeof(struct vmci_linux), GFP_KERNEL);
+ if (vmciLinux == NULL) {
+ return -ENOMEM;
+ }
+ memset(vmciLinux, 0, sizeof *vmciLinux); /* XXX: Necessary? */
+ vmciLinux->ctType = VMCIOBJ_NOT_SET;
+ vmciLinux->userVersion = 0; /* XXX: Not necessary w/ memset */
+ mutex_init(&vmciLinux->lock);
+ filp->private_data = vmciLinux;
+
+ return 0;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * LinuxDriver_Close --
+ *
+ * Called on close of /dev/vmci, most often when the process
+ * exits.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int LinuxDriver_Close(struct inode *inode, // IN
+ struct file *filp) // IN
+{
+ struct vmci_linux *vmciLinux;
+
+ vmciLinux = (struct vmci_linux *)filp->private_data;
+ ASSERT(vmciLinux);
+
+ if (vmciLinux->ctType == VMCIOBJ_CONTEXT) {
+ ASSERT(vmciLinux->context);
+
+ VMCIContext_ReleaseContext(vmciLinux->context);
+ vmciLinux->context = NULL;
+
+ /*
+ * The number of active contexts is used to track whether any
+ * VMX'en are using the host personality. It is incremented when
+ * a context is created through the IOCTL_VMCI_INIT_CONTEXT
+ * ioctl.
+ */
+
+ atomic_dec(&linuxState.activeContexts);
+ }
+ vmciLinux->ctType = VMCIOBJ_NOT_SET;
+
+ kfree(vmciLinux);
+ filp->private_data = NULL;
+ return 0;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * LinuxDriverPoll --
+ *
+ * This is used to wake up the VMX when a VMCI call arrives, or
+ * to wake up select() or poll() at the next clock tick.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static unsigned int LinuxDriverPoll(struct file *filp, poll_table * wait)
+{
+ struct vmci_linux *vmciLinux = (struct vmci_linux *)filp->private_data;
+ unsigned int mask = 0;
+
+ if (vmciLinux->ctType == VMCIOBJ_CONTEXT) {
+ ASSERT(vmciLinux->context != NULL);
+ /*
+ * Check for VMCI calls to this VM context.
+ */
+
+ if (wait != NULL) {
+ poll_wait(filp,
+ &vmciLinux->context->hostContext.waitQueue,
+ wait);
+ }
+
+ spin_lock(&vmciLinux->context->lock);
+ if (vmciLinux->context->pendingDatagrams > 0 ||
+ VMCIHandleArray_GetSize(vmciLinux->
+ context->pendingDoorbellArray) >
+ 0) {
+ mask = POLLIN;
+ }
+ spin_unlock(&vmciLinux->context->lock);
+ }
+ return mask;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * VMCICopyHandleArrayToUser --
+ *
+ * Copies the handles of a handle array into a user buffer, and
+ * returns the new length in userBufferSize. If the copy to the
+ * user buffer fails, the functions still returns VMCI_SUCCESS,
+ * but retval != 0.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int VMCICopyHandleArrayToUser(void *userBufUVA, // IN
+ uint64_t * userBufSize, // IN/OUT
+ struct vmci_handle_arr *handleArray, // IN
+ int *retval) // IN
+{
+ uint32_t arraySize;
+ struct vmci_handle *handles;
+
+ if (handleArray) {
+ arraySize = VMCIHandleArray_GetSize(handleArray);
+ } else {
+ arraySize = 0;
+ }
+
+ if (arraySize * sizeof *handles > *userBufSize) {
+ return VMCI_ERROR_MORE_DATA;
+ }
+
+ *userBufSize = arraySize * sizeof *handles;
+ if (*userBufSize) {
+ *retval = copy_to_user(userBufUVA,
+ VMCIHandleArray_GetHandles
+ (handleArray), *userBufSize);
+ }
+
+ return VMCI_SUCCESS;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIDoQPBrokerAlloc --
+ *
+ * Helper function for creating queue pair and copying the result
+ * to user memory.
+ *
+ * Results:
+ * 0 if result value was copied to user memory, -EFAULT otherwise.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+static int
+VMCIDoQPBrokerAlloc(struct vmci_handle handle,
+ uint32_t peer,
+ uint32_t flags,
+ uint64_t produceSize,
+ uint64_t consumeSize,
+ QueuePairPageStore * pageStore,
+ struct vmci_context *context, bool vmToVm, void *resultUVA)
+{
+ uint32_t cid;
+ int result;
+ int retval;
+
+ cid = VMCIContext_GetId(context);
+
+ result =
+ VMCIQPBroker_Alloc(handle, peer, flags,
+ VMCI_NO_PRIVILEGE_FLAGS, produceSize,
+ consumeSize, pageStore, context);
+ if (result == VMCI_SUCCESS && vmToVm) {
+ result = VMCI_SUCCESS_QUEUEPAIR_CREATE;
+ }
+ retval = copy_to_user(resultUVA, &result, sizeof result);
+ if (retval) {
+ retval = -EFAULT;
+ if (result >= VMCI_SUCCESS) {
+ result = VMCIQPBroker_Detach(handle, context);
+ ASSERT(result >= VMCI_SUCCESS);
+ }
+ }
+
+ return retval;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * LinuxDriver_UnlockedIoctl --
+ *
+ * Main path for UserRPC
+ *
+ * Results:
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+static long
+LinuxDriver_UnlockedIoctl(struct file *filp, u_int iocmd, unsigned long ioarg)
+{
+ struct vmci_linux *vmciLinux = (struct vmci_linux *)filp->private_data;
+ int retval = 0;
+
+ switch (iocmd) {
+ case IOCTL_VMCI_VERSION2:{
+ int verFromUser;
+
+ if (copy_from_user
+ (&verFromUser, (void *)ioarg, sizeof verFromUser)) {
+ retval = -EFAULT;
+ break;
+ }
+
+ vmciLinux->userVersion = verFromUser;
+ }
+ /* Fall through. */
+ case IOCTL_VMCI_VERSION:
+ /*
+ * The basic logic here is:
+ *
+ * If the user sends in a version of 0 tell it our version.
+ * If the user didn't send in a version, tell it our version.
+ * If the user sent in an old version, tell it -its- version.
+ * If the user sent in an newer version, tell it our version.
+ *
+ * The rationale behind telling the caller its version is that
+ * Workstation 6.5 required that VMX and VMCI kernel module were
+ * version sync'd. All new VMX users will be programmed to
+ * handle the VMCI kernel module version.
+ */
+
+ if (vmciLinux->userVersion > 0 &&
+ vmciLinux->userVersion < VMCI_VERSION_HOSTQP) {
+ retval = vmciLinux->userVersion;
+ } else {
+ retval = VMCI_VERSION;
+ }
+ break;
+
+ case IOCTL_VMCI_INIT_CONTEXT:{
+ struct vmci_init_blk initBlock;
+ uid_t user;
+
+ retval =
+ copy_from_user(&initBlock, (void *)ioarg,
+ sizeof initBlock);
+ if (retval != 0) {
+ printk(KERN_INFO LGPFX
+ "Error reading init block.\n");
+ retval = -EFAULT;
+ break;
+ }
+
+ mutex_lock(&vmciLinux->lock);
+ if (vmciLinux->ctType != VMCIOBJ_NOT_SET) {
+ printk(KERN_INFO LGPFX
+ "Received VMCI init on initialized handle.\n");
+ retval = -EINVAL;
+ goto init_release;
+ }
+
+ if (initBlock.flags & ~VMCI_PRIVILEGE_FLAG_RESTRICTED) {
+ printk(KERN_INFO LGPFX
+ "Unsupported VMCI restriction flag.\n");
+ retval = -EINVAL;
+ goto init_release;
+ }
+
+ user = current_uid();
+ retval =
+ VMCIContext_InitContext(initBlock.cid,
+ initBlock.flags,
+ 0 /* Unused */ ,
+ vmciLinux->userVersion,
+ &user, &vmciLinux->context);
+ if (retval < VMCI_SUCCESS) {
+ printk(KERN_INFO LGPFX
+ "Error initializing context.\n");
+ retval =
+ retval ==
+ VMCI_ERROR_DUPLICATE_ENTRY ? -EEXIST :
+ -EINVAL;
+ goto init_release;
+ }
+
+ /*
+ * Copy cid to userlevel, we do this to allow the VMX to enforce its
+ * policy on cid generation.
+ */
+ initBlock.cid = VMCIContext_GetId(vmciLinux->context);
+ retval =
+ copy_to_user((void *)ioarg, &initBlock,
+ sizeof initBlock);
+ if (retval != 0) {
+ VMCIContext_ReleaseContext(vmciLinux->context);
+ vmciLinux->context = NULL;
+ printk(KERN_INFO LGPFX
+ "Error writing init block.\n");
+ retval = -EFAULT;
+ goto init_release;
+ }
+ ASSERT(initBlock.cid != VMCI_INVALID_ID);
+
+ vmciLinux->ctType = VMCIOBJ_CONTEXT;
+
+ atomic_inc(&linuxState.activeContexts);
+
+ init_release:
+ mutex_unlock(&vmciLinux->lock);
+ break;
+ }
+
+ case IOCTL_VMCI_DATAGRAM_SEND:{
+ struct vmci_dg_snd_rcv_info sendInfo;
+ struct vmci_datagram *dg = NULL;
+ uint32_t cid;
+
+ if (vmciLinux->ctType != VMCIOBJ_CONTEXT) {
+ Warning(LGPFX
+ "Ioctl only valid for context handle (iocmd=%d).\n",
+ iocmd);
+ retval = -EINVAL;
+ break;
+ }
+
+ retval =
+ copy_from_user(&sendInfo, (void *)ioarg,
+ sizeof sendInfo);
+ if (retval) {
+ Warning(LGPFX "copy_from_user failed.\n");
+ retval = -EFAULT;
+ break;
+ }
+
+ if (sendInfo.len > VMCI_MAX_DG_SIZE) {
+ Warning(LGPFX
+ "Datagram too big (size=%d).\n",
+ sendInfo.len);
+ retval = -EINVAL;
+ break;
+ }
+
+ if (sendInfo.len < sizeof *dg) {
+ Warning(LGPFX
+ "Datagram too small (size=%d).\n",
+ sendInfo.len);
+ retval = -EINVAL;
+ break;
+ }
+
+ dg = kmalloc(sendInfo.len, GFP_KERNEL);
+ if (dg == NULL) {
+ printk(KERN_INFO LGPFX
+ "Cannot allocate memory to dispatch datagram.\n");
+ retval = -ENOMEM;
+ break;
+ }
+
+ retval =
+ copy_from_user(dg,
+ (char *)(uintptr_t) sendInfo.addr,
+ sendInfo.len);
+ if (retval != 0) {
+ printk(KERN_INFO LGPFX
+ "Error getting datagram (err=%d).\n",
+ retval);
+ kfree(dg);
+ retval = -EFAULT;
+ break;
+ }
+
+ VMCI_DEBUG_LOG(10,
+ (LGPFX
+ "Datagram dst (handle=0x%x:0x%x) src "
+ "(handle=0x%x:0x%x), payload (size=%"
+ FMT64 "u " "bytes).\n",
+ dg->dst.context, dg->dst.resource,
+ dg->src.context, dg->src.resource,
+ dg->payloadSize));
+
+ /* Get source context id. */
+ ASSERT(vmciLinux->context);
+ cid = VMCIContext_GetId(vmciLinux->context);
+ ASSERT(cid != VMCI_INVALID_ID);
+ sendInfo.result = VMCIDatagram_Dispatch(cid, dg, true);
+ kfree(dg);
+ retval =
+ copy_to_user((void *)ioarg, &sendInfo,
+ sizeof sendInfo);
+ break;
+ }
+
+ case IOCTL_VMCI_DATAGRAM_RECEIVE:{
+ struct vmci_dg_snd_rcv_info recvInfo;
+ struct vmci_datagram *dg = NULL;
+ size_t size;
+
+ if (vmciLinux->ctType != VMCIOBJ_CONTEXT) {
+ Warning(LGPFX
+ "Ioctl only valid for context handle (iocmd=%d).\n",
+ iocmd);
+ retval = -EINVAL;
+ break;
+ }
+
+ retval =
+ copy_from_user(&recvInfo, (void *)ioarg,
+ sizeof recvInfo);
+ if (retval) {
+ Warning(LGPFX "copy_from_user failed.\n");
+ retval = -EFAULT;
+ break;
+ }
+
+ ASSERT(vmciLinux->ctType == VMCIOBJ_CONTEXT);
+
+ size = recvInfo.len;
+ ASSERT(vmciLinux->context);
+ recvInfo.result =
+ VMCIContext_DequeueDatagram(vmciLinux->context,
+ &size, &dg);
+
+ if (recvInfo.result >= VMCI_SUCCESS) {
+ ASSERT(dg);
+ retval = copy_to_user((void *)((uintptr_t)
+ recvInfo.addr),
+ dg, VMCI_DG_SIZE(dg));
+ kfree(dg);
+ if (retval != 0) {
+ break;
+ }
+ }
+ retval =
+ copy_to_user((void *)ioarg, &recvInfo,
+ sizeof recvInfo);
+ break;
+ }
+
+ case IOCTL_VMCI_QUEUEPAIR_ALLOC:{
+ if (vmciLinux->ctType != VMCIOBJ_CONTEXT) {
+ printk(KERN_INFO LGPFX
+ "IOCTL_VMCI_QUEUEPAIR_ALLOC only valid for contexts.\n");
+ retval = -EINVAL;
+ break;
+ }
+
+ if (vmciLinux->userVersion < VMCI_VERSION_NOVMVM) {
+ struct vmci_qp_ai_vmvm queuePairAllocInfo;
+ struct vmci_qp_ai_vmvm *info =
+ (struct vmci_qp_ai_vmvm *)ioarg;
+
+ retval =
+ copy_from_user(&queuePairAllocInfo,
+ (void *)ioarg,
+ sizeof queuePairAllocInfo);
+ if (retval) {
+ retval = -EFAULT;
+ break;
+ }
+
+ retval = VMCIDoQPBrokerAlloc(queuePairAllocInfo.handle, queuePairAllocInfo.peer, queuePairAllocInfo.flags, queuePairAllocInfo.produceSize, queuePairAllocInfo.consumeSize, NULL, vmciLinux->context, true, // VM to VM style create
+ &info->result);
+ } else {
+ struct vmci_qp_alloc_info
+ queuePairAllocInfo;
+ struct vmci_qp_alloc_info *info =
+ (struct vmci_qp_alloc_info *)ioarg;
+ QueuePairPageStore pageStore;
+
+ retval =
+ copy_from_user(&queuePairAllocInfo,
+ (void *)ioarg,
+ sizeof queuePairAllocInfo);
+ if (retval) {
+ retval = -EFAULT;
+ break;
+ }
+
+ pageStore.pages = queuePairAllocInfo.ppnVA;
+ pageStore.len = queuePairAllocInfo.numPPNs;
+
+ retval = VMCIDoQPBrokerAlloc(queuePairAllocInfo.handle, queuePairAllocInfo.peer, queuePairAllocInfo.flags, queuePairAllocInfo.produceSize, queuePairAllocInfo.consumeSize, &pageStore, vmciLinux->context, false, // Not VM to VM style create
+ &info->result);
+ }
+ break;
+ }
+
+ case IOCTL_VMCI_QUEUEPAIR_SETVA:{
+ struct vmci_qp_set_va_info setVAInfo;
+ struct vmci_qp_set_va_info *info =
+ (struct vmci_qp_set_va_info *)ioarg;
+ int32_t result;
+
+ if (vmciLinux->ctType != VMCIOBJ_CONTEXT) {
+ printk(KERN_INFO LGPFX
+ "IOCTL_VMCI_QUEUEPAIR_SETVA only valid for contexts.\n");
+ retval = -EINVAL;
+ break;
+ }
+
+ if (vmciLinux->userVersion < VMCI_VERSION_NOVMVM) {
+ printk(KERN_INFO LGPFX
+ "IOCTL_VMCI_QUEUEPAIR_SETVA not supported for this VMX version.\n");
+ retval = -EINVAL;
+ break;
+ }
+
+ retval =
+ copy_from_user(&setVAInfo, (void *)ioarg,
+ sizeof setVAInfo);
+ if (retval) {
+ retval = -EFAULT;
+ break;
+ }
+
+ if (setVAInfo.va) {
+ /*
+ * VMX is passing down a new VA for the queue pair mapping.
+ */
+
+ result =
+ VMCIQPBroker_Map(setVAInfo.handle,
+ vmciLinux->context,
+ setVAInfo.va);
+ } else {
+ /*
+ * The queue pair is about to be unmapped by the VMX.
+ */
+
+ result =
+ VMCIQPBroker_Unmap(setVAInfo.handle,
+ vmciLinux->context, 0);
+ }
+
+ retval =
+ copy_to_user(&info->result, &result, sizeof result);
+ if (retval) {
+ retval = -EFAULT;
+ }
+
+ break;
+ }
+
+ case IOCTL_VMCI_QUEUEPAIR_SETPAGEFILE:{
+ struct vmci_qp_page_file_info pageFileInfo;
+ struct vmci_qp_page_file_info *info =
+ (struct vmci_qp_page_file_info *)ioarg;
+ int32_t result;
+
+ if (vmciLinux->userVersion < VMCI_VERSION_HOSTQP ||
+ vmciLinux->userVersion >= VMCI_VERSION_NOVMVM) {
+ printk(KERN_INFO LGPFX
+ "IOCTL_VMCI_QUEUEPAIR_SETPAGEFILE not supported this VMX "
+ "(version=%d).\n",
+ vmciLinux->userVersion);
+ retval = -EINVAL;
+ break;
+ }
+
+ if (vmciLinux->ctType != VMCIOBJ_CONTEXT) {
+ printk(KERN_INFO LGPFX
+ "IOCTL_VMCI_QUEUEPAIR_SETPAGEFILE only valid for contexts.\n");
+ retval = -EINVAL;
+ break;
+ }
+
+ retval =
+ copy_from_user(&pageFileInfo, (void *)ioarg,
+ sizeof *info);
+ if (retval) {
+ retval = -EFAULT;
+ break;
+ }
+
+ /*
+ * Communicate success pre-emptively to the caller. Note that
+ * the basic premise is that it is incumbent upon the caller not
+ * to look at the info.result field until after the ioctl()
+ * returns. And then, only if the ioctl() result indicates no
+ * error. We send up the SUCCESS status before calling
+ * SetPageStore() store because failing to copy up the result
+ * code means unwinding the SetPageStore().
+ *
+ * It turns out the logic to unwind a SetPageStore() opens a can
+ * of worms. For example, if a host had created the QueuePair
+ * and a guest attaches and SetPageStore() is successful but
+ * writing success fails, then ... the host has to be stopped
+ * from writing (anymore) data into the QueuePair. That means
+ * an additional test in the VMCI_Enqueue() code path. Ugh.
+ */
+
+ result = VMCI_SUCCESS;
+ retval =
+ copy_to_user(&info->result, &result, sizeof result);
+ if (retval == 0) {
+ result =
+ VMCIQPBroker_SetPageStore
+ (pageFileInfo.handle,
+ pageFileInfo.produceVA,
+ pageFileInfo.consumeVA,
+ vmciLinux->context);
+ if (result < VMCI_SUCCESS) {
+
+ retval =
+ copy_to_user(&info->result,
+ &result,
+ sizeof result);
+ if (retval != 0) {
+ /*
+ * Note that in this case the SetPageStore() call
+ * failed but we were unable to communicate that to the
+ * caller (because the copy_to_user() call failed).
+ * So, if we simply return an error (in this case
+ * -EFAULT) then the caller will know that the
+ * SetPageStore failed even though we couldn't put the
+ * result code in the result field and indicate exactly
+ * why it failed.
+ *
+ * That says nothing about the issue where we were once
+ * able to write to the caller's info memory and now
+ * can't. Something more serious is probably going on
+ * than the fact that SetPageStore() didn't work.
+ */
+ retval = -EFAULT;
+ }
+ }
+
+ } else {
+ /*
+ * In this case, we can't write a result field of the
+ * caller's info block. So, we don't even try to
+ * SetPageStore().
+ */
+ retval = -EFAULT;
+ }
+
+ break;
+ }
+
+ case IOCTL_VMCI_QUEUEPAIR_DETACH:{
+ struct vmci_qp_dtch_info detachInfo;
+ struct vmci_qp_dtch_info *info =
+ (struct vmci_qp_dtch_info *)ioarg;
+ int32_t result;
+
+ if (vmciLinux->ctType != VMCIOBJ_CONTEXT) {
+ printk(KERN_INFO LGPFX
+ "IOCTL_VMCI_QUEUEPAIR_DETACH only valid for contexts.\n");
+ retval = -EINVAL;
+ break;
+ }
+
+ retval =
+ copy_from_user(&detachInfo, (void *)ioarg,
+ sizeof detachInfo);
+ if (retval) {
+ retval = -EFAULT;
+ break;
+ }
+
+ result =
+ VMCIQPBroker_Detach(detachInfo.handle,
+ vmciLinux->context);
+ if (result == VMCI_SUCCESS
+ && vmciLinux->userVersion < VMCI_VERSION_NOVMVM) {
+ result = VMCI_SUCCESS_LAST_DETACH;
+ }
+
+ retval =
+ copy_to_user(&info->result, &result, sizeof result);
+ if (retval) {
+ retval = -EFAULT;
+ }
+
+ break;
+ }
+
+ case IOCTL_VMCI_CTX_ADD_NOTIFICATION:{
+ struct vmci_notify_add_rm_info arInfo;
+ struct vmci_notify_add_rm_info *info =
+ (struct vmci_notify_add_rm_info *)ioarg;
+ int32_t result;
+ uint32_t cid;
+
+ if (vmciLinux->ctType != VMCIOBJ_CONTEXT) {
+ printk(KERN_INFO LGPFX
+ "IOCTL_VMCI_CTX_ADD_NOTIFICATION only valid for contexts.\n");
+ retval = -EINVAL;
+ break;
+ }
+
+ retval =
+ copy_from_user(&arInfo, (void *)ioarg,
+ sizeof arInfo);
+ if (retval) {
+ retval = -EFAULT;
+ break;
+ }
+
+ cid = VMCIContext_GetId(vmciLinux->context);
+ result =
+ VMCIContext_AddNotification(cid, arInfo.remoteCID);
+ retval =
+ copy_to_user(&info->result, &result, sizeof result);
+ if (retval) {
+ retval = -EFAULT;
+ break;
+ }
+ break;
+ }
+
+ case IOCTL_VMCI_CTX_REMOVE_NOTIFICATION:{
+ struct vmci_notify_add_rm_info arInfo;
+ struct vmci_notify_add_rm_info *info =
+ (struct vmci_notify_add_rm_info *)ioarg;
+ int32_t result;
+ uint32_t cid;
+
+ if (vmciLinux->ctType != VMCIOBJ_CONTEXT) {
+ printk(KERN_INFO LGPFX
+ "IOCTL_VMCI_CTX_REMOVE_NOTIFICATION only valid for "
+ "contexts.\n");
+ retval = -EINVAL;
+ break;
+ }
+
+ retval =
+ copy_from_user(&arInfo, (void *)ioarg,
+ sizeof arInfo);
+ if (retval) {
+ retval = -EFAULT;
+ break;
+ }
+
+ cid = VMCIContext_GetId(vmciLinux->context);
+ result =
+ VMCIContext_RemoveNotification(cid,
+ arInfo.remoteCID);
+ retval =
+ copy_to_user(&info->result, &result, sizeof result);
+ if (retval) {
+ retval = -EFAULT;
+ break;
+ }
+ break;
+ }
+
+ case IOCTL_VMCI_CTX_GET_CPT_STATE:{
+ struct vmci_chkpt_buf_info getInfo;
+ uint32_t cid;
+ char *cptBuf;
+
+ if (vmciLinux->ctType != VMCIOBJ_CONTEXT) {
+ printk(KERN_INFO LGPFX
+ "IOCTL_VMCI_CTX_GET_CPT_STATE only valid for contexts.\n");
+ retval = -EINVAL;
+ break;
+ }
+
+ retval =
+ copy_from_user(&getInfo, (void *)ioarg,
+ sizeof getInfo);
+ if (retval) {
+ retval = -EFAULT;
+ break;
+ }
+
+ cid = VMCIContext_GetId(vmciLinux->context);
+ getInfo.result =
+ VMCIContext_GetCheckpointState(cid,
+ getInfo.cptType,
+ &getInfo.bufSize,
+ &cptBuf);
+ if (getInfo.result == VMCI_SUCCESS && getInfo.bufSize) {
+ retval = copy_to_user((void *)(uintptr_t)
+ getInfo.cptBuf, cptBuf,
+ getInfo.bufSize);
+ kfree(cptBuf);
+ if (retval) {
+ retval = -EFAULT;
+ break;
+ }
+ }
+ retval =
+ copy_to_user((void *)ioarg, &getInfo,
+ sizeof getInfo);
+ if (retval) {
+ retval = -EFAULT;
+ break;
+ }
+ break;
+ }
+
+ case IOCTL_VMCI_CTX_SET_CPT_STATE:{
+ struct vmci_chkpt_buf_info setInfo;
+ uint32_t cid;
+ char *cptBuf;
+
+ if (vmciLinux->ctType != VMCIOBJ_CONTEXT) {
+ printk(KERN_INFO LGPFX
+ "IOCTL_VMCI_CTX_SET_CPT_STATE only valid for contexts.\n");
+ retval = -EINVAL;
+ break;
+ }
+
+ retval =
+ copy_from_user(&setInfo, (void *)ioarg,
+ sizeof setInfo);
+ if (retval) {
+ retval = -EFAULT;
+ break;
+ }
+
+ cptBuf = kmalloc(setInfo.bufSize, GFP_KERNEL);
+ if (cptBuf == NULL) {
+ printk(KERN_INFO LGPFX
+ "Cannot allocate memory to set cpt state (type=%d).\n",
+ setInfo.cptType);
+ retval = -ENOMEM;
+ break;
+ }
+ retval =
+ copy_from_user(cptBuf,
+ (void *)(uintptr_t) setInfo.cptBuf,
+ setInfo.bufSize);
+ if (retval) {
+ kfree(cptBuf);
+ retval = -EFAULT;
+ break;
+ }
+
+ cid = VMCIContext_GetId(vmciLinux->context);
+ setInfo.result =
+ VMCIContext_SetCheckpointState(cid,
+ setInfo.cptType,
+ setInfo.bufSize,
+ cptBuf);
+ kfree(cptBuf);
+ retval =
+ copy_to_user((void *)ioarg, &setInfo,
+ sizeof setInfo);
+ if (retval) {
+ retval = -EFAULT;
+ break;
+ }
+ break;
+ }
+
+ case IOCTL_VMCI_GET_CONTEXT_ID:{
+ uint32_t cid = VMCI_HOST_CONTEXT_ID;
+
+ retval = copy_to_user((void *)ioarg, &cid, sizeof cid);
+ break;
+ }
+
+ case IOCTL_VMCI_SET_NOTIFY:{
+ struct vmci_set_notify_info notifyInfo;
+
+ if (vmciLinux->ctType != VMCIOBJ_CONTEXT) {
+ printk(KERN_INFO LGPFX
+ "IOCTL_VMCI_SET_NOTIFY only valid for contexts.\n");
+ retval = -EINVAL;
+ break;
+ }
+
+ retval =
+ copy_from_user(¬ifyInfo, (void *)ioarg,
+ sizeof notifyInfo);
+ if (retval) {
+ retval = -EFAULT;
+ break;
+ }
+
+ if ((uintptr_t) notifyInfo.notifyUVA !=
+ (uintptr_t) NULL) {
+ notifyInfo.result =
+ VMCISetupNotify(vmciLinux->context,
+ (uintptr_t)
+ notifyInfo.notifyUVA);
+ } else {
+ VMCIUnsetNotifyInt(vmciLinux->context, true);
+ notifyInfo.result = VMCI_SUCCESS;
+ }
+
+ retval =
+ copy_to_user((void *)ioarg, ¬ifyInfo,
+ sizeof notifyInfo);
+ if (retval) {
+ retval = -EFAULT;
+ break;
+ }
+
+ break;
+ }
+
+ case IOCTL_VMCI_NOTIFY_RESOURCE:{
+ struct vmci_notify_rsrc_info info;
+ uint32_t cid;
+
+ if (vmciLinux->userVersion < VMCI_VERSION_NOTIFY) {
+ printk(KERN_INFO LGPFX
+ "IOCTL_VMCI_NOTIFY_RESOURCE is invalid for current"
+ " VMX versions.\n");
+ retval = -EINVAL;
+ break;
+ }
+
+ if (vmciLinux->ctType != VMCIOBJ_CONTEXT) {
+ printk(KERN_INFO LGPFX
+ "IOCTL_VMCI_NOTIFY_RESOURCE is only valid for contexts.\n");
+ retval = -EINVAL;
+ break;
+ }
+
+ retval =
+ copy_from_user(&info, (void *)ioarg, sizeof info);
+ if (retval) {
+ retval = -EFAULT;
+ break;
+ }
+
+ cid = VMCIContext_GetId(vmciLinux->context);
+ switch (info.action) {
+ case VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY:
+ if (info.resource ==
+ VMCI_NOTIFY_RESOURCE_DOOR_BELL) {
+ info.result =
+ VMCIContext_NotifyDoorbell(cid,
+ info.handle,
+ VMCI_NO_PRIVILEGE_FLAGS);
+ } else {
+ info.result = VMCI_ERROR_UNAVAILABLE;
+ }
+ break;
+ case VMCI_NOTIFY_RESOURCE_ACTION_CREATE:
+ info.result =
+ VMCIContext_DoorbellCreate(cid,
+ info.handle);
+ break;
+ case VMCI_NOTIFY_RESOURCE_ACTION_DESTROY:
+ info.result =
+ VMCIContext_DoorbellDestroy(cid,
+ info.handle);
+ break;
+ default:
+ printk(KERN_INFO LGPFX
+ "IOCTL_VMCI_NOTIFY_RESOURCE got unknown action (action=%d).\n",
+ info.action);
+ info.result = VMCI_ERROR_INVALID_ARGS;
+ }
+ retval = copy_to_user((void *)ioarg, &info,
+ sizeof info);
+ if (retval) {
+ retval = -EFAULT;
+ break;
+ }
+
+ break;
+ }
+
+ case IOCTL_VMCI_NOTIFICATIONS_RECEIVE:{
+ struct vmci_notify_recv_info info;
+ struct vmci_handle_arr *dbHandleArray;
+ struct vmci_handle_arr *qpHandleArray;
+ uint32_t cid;
+
+ if (vmciLinux->ctType != VMCIOBJ_CONTEXT) {
+ printk(KERN_INFO LGPFX
+ "IOCTL_VMCI_NOTIFICATIONS_RECEIVE is only valid for contexts.\n");
+ retval = -EINVAL;
+ break;
+ }
+
+ if (vmciLinux->userVersion < VMCI_VERSION_NOTIFY) {
+ printk(KERN_INFO LGPFX
+ "IOCTL_VMCI_NOTIFICATIONS_RECEIVE is not supported for the"
+ " current vmx version.\n");
+ retval = -EINVAL;
+ break;
+ }
+
+ retval =
+ copy_from_user(&info, (void *)ioarg, sizeof info);
+ if (retval) {
+ retval = -EFAULT;
+ break;
+ }
+
+ if ((info.dbHandleBufSize && !info.dbHandleBufUVA)
+ || (info.qpHandleBufSize && !info.qpHandleBufUVA)) {
+ retval = -EINVAL;
+ break;
+ }
+
+ cid = VMCIContext_GetId(vmciLinux->context);
+ info.result =
+ VMCIContext_ReceiveNotificationsGet(cid,
+ &dbHandleArray,
+ &qpHandleArray);
+ if (info.result == VMCI_SUCCESS) {
+ info.result = VMCICopyHandleArrayToUser((void *)
+ (uintptr_t)
+ info.dbHandleBufUVA,
+ &info.dbHandleBufSize,
+ dbHandleArray,
+ &retval);
+ if (info.result == VMCI_SUCCESS && !retval) {
+ info.result =
+ VMCICopyHandleArrayToUser((void *)
+ (uintptr_t)
+ info.qpHandleBufUVA,
+ &info.qpHandleBufSize,
+ qpHandleArray,
+ &retval);
+ }
+ if (!retval) {
+ retval =
+ copy_to_user((void *)ioarg,
+ &info, sizeof info);
+ }
+ VMCIContext_ReceiveNotificationsRelease
+ (cid, dbHandleArray, qpHandleArray,
+ info.result == VMCI_SUCCESS && !retval);
+ } else {
+ retval =
+ copy_to_user((void *)ioarg, &info,
+ sizeof info);
+ }
+ break;
+ }
+
+ default:
+ Warning(LGPFX "Unknown ioctl (iocmd=%d).\n", iocmd);
+ retval = -EINVAL;
+ }
+
+ return retval;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIUserVALockPage --
+ *
+ * Lock physical page backing a given user VA. Copied from
+ * bora/modules/vmnet/linux/userif.c:UserIfLockPage(). TODO libify the
+ * common code.
+ *
+ * Results:
+ * Pointer to struct page on success, NULL otherwise.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+static inline struct page *VMCIUserVALockPage(uintptr_t addr) // IN:
+{
+ struct page *page = NULL;
+ int retval;
+
+ down_read(¤t->mm->mmap_sem);
+ retval = get_user_pages(current, current->mm, addr,
+ 1, 1, 0, &page, NULL);
+ up_read(¤t->mm->mmap_sem);
+
+ if (retval != 1) {
+ return NULL;
+ }
+
+ return page;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIMapBoolPtr --
+ *
+ * Lock physical page backing a given user VA and maps it to kernel
+ * address space. The range of the mapped memory should be within a
+ * single page otherwise an error is returned. Copied from
+ * bora/modules/vmnet/linux/userif.c:VNetUserIfMapUint32Ptr(). TODO
+ * libify the common code.
+ *
+ * Results:
+ * 0 on success, negative error code otherwise.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+static inline int VMCIMapBoolPtr(uintptr_t notifyUVA, // IN:
+ struct page **p, // OUT:
+ bool ** notifyPtr) // OUT:
+{
+ if (!access_ok(VERIFY_WRITE, notifyUVA, sizeof **notifyPtr) ||
+ (((notifyUVA + sizeof **notifyPtr - 1) & ~(PAGE_SIZE - 1)) !=
+ (notifyUVA & ~(PAGE_SIZE - 1)))) {
+ return -EINVAL;
+ }
+
+ *p = VMCIUserVALockPage(notifyUVA);
+ if (*p == NULL) {
+ return -EAGAIN;
+ }
+
+ *notifyPtr =
+ (bool *) ((uint8_t *) kmap(*p) + (notifyUVA & (PAGE_SIZE - 1)));
+ return 0;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCISetupNotify --
+ *
+ * Sets up a given context for notify to work. Calls VMCIMapBoolPtr()
+ * which maps the notify boolean in user VA in kernel space.
+ *
+ * Results:
+ * VMCI_SUCCESS on success, error code otherwise.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+static int VMCISetupNotify(struct vmci_context *context, // IN:
+ uintptr_t notifyUVA) // IN:
+{
+ int retval;
+
+ if (context->notify) {
+ Warning(LGPFX "Notify mechanism is already set up.\n");
+ return VMCI_ERROR_DUPLICATE_ENTRY;
+ }
+
+ retval =
+ VMCIMapBoolPtr(notifyUVA, &context->notifyPage,
+ &context->notify) ==
+ 0 ? VMCI_SUCCESS : VMCI_ERROR_GENERIC;
+ if (retval == VMCI_SUCCESS) {
+ VMCIContext_CheckAndSignalNotify(context);
+ }
+
+ return retval;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIUnsetNotifyInt --
+ *
+ * Internal version of VMCIUnsetNotify, that allows for locking
+ * the context before unsetting the notify pointer. If useLock is
+ * true, the context lock is grabbed.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+static void VMCIUnsetNotifyInt(struct vmci_context *context, // IN
+ bool useLock) // IN
+{
+ if (useLock) {
+ spin_lock(&context->lock);
+ }
+
+ if (context->notifyPage) {
+ struct page *notifyPage = context->notifyPage;
+
+ context->notify = NULL;
+ context->notifyPage = NULL;
+
+ if (useLock) {
+ spin_unlock(&context->lock);
+ }
+
+ kunmap(notifyPage);
+ put_page(notifyPage);
+ } else {
+ if (useLock) {
+ spin_unlock(&context->lock);
+ }
+ }
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIUnsetNotify --
+ *
+ * Reverts actions set up by VMCISetupNotify(). Unmaps and unlocks the
+ * page mapped/locked by VMCISetupNotify().
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+void VMCIUnsetNotify(struct vmci_context *context) // IN:
+{
+ VMCIUnsetNotifyInt(context, false);
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * PCI device support --
+ *
+ * The following functions implement the support for the VMCI
+ * guest device. This includes initializing the device and
+ * interrupt handling.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * dispatch_datagrams --
+ *
+ * Reads and dispatches incoming datagrams.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * Reads data from the device.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+void dispatch_datagrams(unsigned long data)
+{
+ struct vmci_device *dev = (struct vmci_device *)data;
+
+ if (dev == NULL) {
+ printk(KERN_DEBUG
+ "vmci: dispatch_datagrams(): no vmci device"
+ "present.\n");
+ return;
+ }
+
+ if (data_buffer == NULL) {
+ printk(KERN_DEBUG
+ "vmci: dispatch_datagrams(): no buffer present.\n");
+ return;
+ }
+
+ VMCI_ReadDatagramsFromPort((int)0,
+ dev->ioaddr + VMCI_DATA_IN_ADDR,
+ data_buffer, data_buffer_size);
+}
+DECLARE_TASKLET(vmci_dg_tasklet, dispatch_datagrams, (unsigned long)&vmci_dev);
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * process_bitmap --
+ *
+ * Scans the notification bitmap for raised flags, clears them
+ * and handles the notifications.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+void process_bitmap(unsigned long data)
+{
+ struct vmci_device *dev = (struct vmci_device *)data;
+
+ if (dev == NULL) {
+ printk(KERN_DEBUG "vmci: process_bitmaps(): no vmci device"
+ "present.\n");
+ return;
+ }
+
+ if (notification_bitmap == NULL) {
+ printk(KERN_DEBUG
+ "vmci: process_bitmaps(): no bitmap present.\n");
+ return;
+ }
+
+ VMCI_ScanNotificationBitmap(notification_bitmap);
+}
+DECLARE_TASKLET(vmci_bm_tasklet, process_bitmap, (unsigned long)&vmci_dev);
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * vmci_guest_init --
+ *
+ * Initializes the VMCI PCI device. The initialization might fail
+ * if there is no VMCI PCI device.
+ *
+ * Results:
+ * 0 on success, other error codes on failure.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+static int vmci_guest_init(void)
+{
+ int retval;
+
+ /* Initialize guest device data. */
+ mutex_init(&vmci_dev.lock);
+ vmci_dev.intr_type = VMCI_INTR_TYPE_INTX;
+ vmci_dev.exclusive_vectors = false;
+ spin_lock_init(&vmci_dev.dev_spinlock);
+ vmci_dev.enabled = false;
+ atomic_set(&vmci_dev.datagrams_allowed, 0);
+ atomic_set(&guestDeviceActive, 0);
+
+ data_buffer = vmalloc(data_buffer_size);
+ if (!data_buffer) {
+ return -ENOMEM;
+ }
+
+ /* This should be last to make sure we are done initializing. */
+ retval = pci_register_driver(&vmci_driver);
+ if (retval < 0) {
+ vfree(data_buffer);
+ data_buffer = NULL;
+ return retval;
+ }
+
+ return 0;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * vmci_enable_msix --
+ *
+ * Enable MSI-X. Try exclusive vectors first, then shared vectors.
+ *
+ * Results:
+ * 0 on success, other error codes on failure.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+static int vmci_enable_msix(struct pci_dev *pdev) // IN
+{
+ int i;
+ int result;
+
+ for (i = 0; i < VMCI_MAX_INTRS; ++i) {
+ vmci_dev.msix_entries[i].entry = i;
+ vmci_dev.msix_entries[i].vector = i;
+ }
+
+ result = pci_enable_msix(pdev, vmci_dev.msix_entries, VMCI_MAX_INTRS);
+ if (!result) {
+ vmci_dev.exclusive_vectors = true;
+ } else if (result > 0) {
+ result = pci_enable_msix(pdev, vmci_dev.msix_entries, 1);
+ }
+ return result;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * vmci_interrupt --
+ *
+ * Interrupt handler for legacy or MSI interrupt, or for first MSI-X
+ * interrupt (vector VMCI_INTR_DATAGRAM).
+ *
+ * Results:
+ * COMPAT_IRQ_HANDLED if the interrupt is handled, COMPAT_IRQ_NONE if
+ * not an interrupt.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+static irqreturn_t vmci_interrupt(int irq, // IN
+ void *clientdata) // IN
+{
+ struct vmci_device *dev = clientdata;
+
+ if (dev == NULL) {
+ printk(KERN_DEBUG
+ "vmci_interrupt(): irq %d for unknown device.\n", irq);
+ return IRQ_NONE;
+ }
+
+ /*
+ * If we are using MSI-X with exclusive vectors then we simply schedule
+ * the datagram tasklet, since we know the interrupt was meant for us.
+ * Otherwise we must read the ICR to determine what to do.
+ */
+
+ if (dev->intr_type == VMCI_INTR_TYPE_MSIX && dev->exclusive_vectors) {
+ tasklet_schedule(&vmci_dg_tasklet);
+ } else {
+ unsigned int icr;
+
+ ASSERT(dev->intr_type == VMCI_INTR_TYPE_INTX ||
+ dev->intr_type == VMCI_INTR_TYPE_MSI);
+
+ /* Acknowledge interrupt and determine what needs doing. */
+ icr = inl(dev->ioaddr + VMCI_ICR_ADDR);
+ if (icr == 0 || icr == 0xffffffff) {
+ return IRQ_NONE;
+ }
+
+ if (icr & VMCI_ICR_DATAGRAM) {
+ tasklet_schedule(&vmci_dg_tasklet);
+ icr &= ~VMCI_ICR_DATAGRAM;
+ }
+ if (icr & VMCI_ICR_NOTIFICATION) {
+ tasklet_schedule(&vmci_bm_tasklet);
+ icr &= ~VMCI_ICR_NOTIFICATION;
+ }
+ if (icr != 0) {
+ printk(KERN_INFO LGPFX
+ "Ignoring unknown interrupt cause (%d).\n", icr);
+ }
+ }
+
+ return IRQ_HANDLED;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * vmci_interrupt_bm --
+ *
+ * Interrupt handler for MSI-X interrupt vector VMCI_INTR_NOTIFICATION,
+ * which is for the notification bitmap. Will only get called if we are
+ * using MSI-X with exclusive vectors.
+ *
+ * Results:
+ * COMPAT_IRQ_HANDLED if the interrupt is handled, COMPAT_IRQ_NONE if
+ * not an interrupt.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+static irqreturn_t vmci_interrupt_bm(int irq, // IN
+ void *clientdata) // IN
+{
+ struct vmci_device *dev = clientdata;
+
+ if (dev == NULL) {
+ printk(KERN_DEBUG
+ "vmci_interrupt_bm(): irq %d for unknown device.\n",
+ irq);
+ return IRQ_NONE;
+ }
+
+ /* For MSI-X we can just assume it was meant for us. */
+ ASSERT(dev->intr_type == VMCI_INTR_TYPE_MSIX && dev->exclusive_vectors);
+ tasklet_schedule(&vmci_bm_tasklet);
+
+ return IRQ_HANDLED;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * vmci_probe_device --
+ *
+ * Most of the initialization at module load time is done here.
+ *
+ * Results:
+ * Returns 0 for success, an error otherwise.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+static int __devinit vmci_probe_device(struct pci_dev *pdev, // IN: vmci PCI device
+ const struct pci_device_id *id) // IN: matching device ID
+{
+ unsigned int ioaddr;
+ unsigned int ioaddr_size;
+ unsigned int capabilities;
+ int result;
+
+ printk(KERN_INFO "Probing for vmci/PCI.\n");
+
+ result = pci_enable_device(pdev);
+ if (result) {
+ printk(KERN_ERR "Cannot VMCI device %s: error %d\n",
+ pci_name(pdev), result);
+ return result;
+ }
+ pci_set_master(pdev); /* To enable QueuePair functionality. */
+ ioaddr = pci_resource_start(pdev, 0);
+ ioaddr_size = pci_resource_len(pdev, 0);
+
+ /*
+ * Request I/O region with adjusted base address and size. The adjusted
+ * values are needed and used if we release the region in case of failure.
+ */
+
+ if (!request_region(ioaddr, ioaddr_size, "vmci")) {
+ printk(KERN_INFO "vmci: Another driver already loaded "
+ "for device in slot %s.\n", pci_name(pdev));
+ goto pci_disable;
+ }
+
+ printk(KERN_INFO "Found vmci/PCI at %#x, irq %u.\n", ioaddr, pdev->irq);
+
+ /*
+ * Verify that the VMCI Device supports the capabilities that
+ * we need. If the device is missing capabilities that we would
+ * like to use, check for fallback capabilities and use those
+ * instead (so we can run a new VM on old hosts). Fail the load if
+ * a required capability is missing and there is no fallback.
+ *
+ * Right now, we need datagrams. There are no fallbacks.
+ */
+ capabilities = inl(ioaddr + VMCI_CAPS_ADDR);
+
+ if ((capabilities & VMCI_CAPS_DATAGRAM) == 0) {
+ printk(KERN_ERR "VMCI device does not support datagrams.\n");
+ goto release;
+ }
+
+ /*
+ * If the hardware supports notifications, we will use that as
+ * well.
+ */
+ if (capabilities & VMCI_CAPS_NOTIFICATIONS) {
+ capabilities = VMCI_CAPS_DATAGRAM;
+ notification_bitmap = vmalloc(PAGE_SIZE);
+ if (notification_bitmap == NULL) {
+ printk(KERN_ERR
+ "VMCI device unable to allocate notification bitmap.\n");
+ } else {
+ memset(notification_bitmap, 0, PAGE_SIZE);
+ capabilities |= VMCI_CAPS_NOTIFICATIONS;
+ }
+ } else {
+ capabilities = VMCI_CAPS_DATAGRAM;
+ }
+ printk(KERN_INFO "VMCI: using capabilities 0x%x.\n", capabilities);
+
+ /* Let the host know which capabilities we intend to use. */
+ outl(capabilities, ioaddr + VMCI_CAPS_ADDR);
+
+ /* Device struct initialization. */
+ mutex_lock(&vmci_dev.lock);
+ if (vmci_dev.enabled) {
+ printk(KERN_ERR "VMCI device already enabled.\n");
+ goto unlock;
+ }
+
+ vmci_dev.ioaddr = ioaddr;
+ vmci_dev.ioaddr_size = ioaddr_size;
+ atomic_set(&vmci_dev.datagrams_allowed, 1);
+
+ /*
+ * Register notification bitmap with device if that capability is
+ * used
+ */
+ if (capabilities & VMCI_CAPS_NOTIFICATIONS) {
+ unsigned long bitmapPPN;
+ bitmapPPN = page_to_pfn(vmalloc_to_page(notification_bitmap));
+ if (!VMCI_RegisterNotificationBitmap(bitmapPPN)) {
+ printk(KERN_ERR
+ "VMCI device unable to register notification bitmap "
+ "with PPN 0x%x.\n", (uint32_t) bitmapPPN);
+ goto datagram_disallow;
+ }
+ }
+
+ /* Check host capabilities. */
+ if (!VMCI_CheckHostCapabilities()) {
+ goto remove_bitmap;
+ }
+
+ /* Enable device. */
+ vmci_dev.enabled = true;
+ pci_set_drvdata(pdev, &vmci_dev);
+
+ /*
+ * We do global initialization here because we need datagrams
+ * during VMCIUtil_Init, since it registers for VMCI events. If we
+ * ever support more than one VMCI device we will have to create
+ * seperate LateInit/EarlyExit functions that can be used to do
+ * initialization/cleanup that depends on the device being
+ * accessible. We need to initialize VMCI components before
+ * requesting an irq - the VMCI interrupt handler uses these
+ * components, and it may be invoked once request_irq() has
+ * registered the handler (as the irq line may be shared).
+ */
+ VMCIUtil_Init();
+
+ if (VMCIQPGuestEndpoints_Init() < VMCI_SUCCESS) {
+ goto util_exit;
+ }
+
+ /*
+ * Enable interrupts. Try MSI-X first, then MSI, and then fallback on
+ * legacy interrupts.
+ */
+ if (!vmci_disable_msix && !vmci_enable_msix(pdev)) {
+ vmci_dev.intr_type = VMCI_INTR_TYPE_MSIX;
+ vmci_dev.irq = vmci_dev.msix_entries[0].vector;
+ } else if (!vmci_disable_msi && !pci_enable_msi(pdev)) {
+ vmci_dev.intr_type = VMCI_INTR_TYPE_MSI;
+ vmci_dev.irq = pdev->irq;
+ } else {
+ vmci_dev.intr_type = VMCI_INTR_TYPE_INTX;
+ vmci_dev.irq = pdev->irq;
+ }
+
+ /* Request IRQ for legacy or MSI interrupts, or for first MSI-X vector. */
+ result = request_irq(vmci_dev.irq, vmci_interrupt, IRQF_SHARED,
+ "vmci", &vmci_dev);
+ if (result) {
+ printk(KERN_ERR "vmci: irq %u in use: %d\n", vmci_dev.irq,
+ result);
+ goto components_exit;
+ }
+
+ /*
+ * For MSI-X with exclusive vectors we need to request an interrupt for each
+ * vector so that we get a separate interrupt handler routine. This allows
+ * us to distinguish between the vectors.
+ */
+
+ if (vmci_dev.exclusive_vectors) {
+ ASSERT(vmci_dev.intr_type == VMCI_INTR_TYPE_MSIX);
+ result = request_irq(vmci_dev.msix_entries[1].vector,
+ vmci_interrupt_bm, 0, "vmci", &vmci_dev);
+ if (result) {
+ printk(KERN_ERR "vmci: irq %u in use: %d\n",
+ vmci_dev.msix_entries[1].vector, result);
+ free_irq(vmci_dev.irq, &vmci_dev);
+ goto components_exit;
+ }
+ }
+
+ printk(KERN_INFO "Registered vmci device.\n");
+
+ atomic_inc(&guestDeviceActive);
+
+ mutex_unlock(&vmci_dev.lock);
+
+ /* Enable specific interrupt bits. */
+ if (capabilities & VMCI_CAPS_NOTIFICATIONS) {
+ outl(VMCI_IMR_DATAGRAM | VMCI_IMR_NOTIFICATION,
+ vmci_dev.ioaddr + VMCI_IMR_ADDR);
+ } else {
+ outl(VMCI_IMR_DATAGRAM, vmci_dev.ioaddr + VMCI_IMR_ADDR);
+ }
+
+ /* Enable interrupts. */
+ outl(VMCI_CONTROL_INT_ENABLE, vmci_dev.ioaddr + VMCI_CONTROL_ADDR);
+
+ return 0;
+
+ components_exit:
+ VMCIQPGuestEndpoints_Exit();
+ util_exit:
+ VMCIUtil_Exit();
+ vmci_dev.enabled = false;
+ if (vmci_dev.intr_type == VMCI_INTR_TYPE_MSIX) {
+ pci_disable_msix(pdev);
+ } else if (vmci_dev.intr_type == VMCI_INTR_TYPE_MSI) {
+ pci_disable_msi(pdev);
+ }
+ remove_bitmap:
+ if (notification_bitmap) {
+ outl(VMCI_CONTROL_RESET, vmci_dev.ioaddr + VMCI_CONTROL_ADDR);
+ }
+ datagram_disallow:
+ atomic_set(&vmci_dev.datagrams_allowed, 0);
+ unlock:
+ mutex_unlock(&vmci_dev.lock);
+ release:
+ if (notification_bitmap) {
+ vfree(notification_bitmap);
+ notification_bitmap = NULL;
+ }
+ release_region(ioaddr, ioaddr_size);
+ pci_disable:
+ pci_disable_device(pdev);
+ return -EBUSY;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * vmci_remove_device --
+ *
+ * Cleanup, called for each device on unload.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+static void __devexit vmci_remove_device(struct pci_dev *pdev)
+{
+ struct vmci_device *dev = pci_get_drvdata(pdev);
+
+ printk(KERN_INFO "Removing vmci device\n");
+
+ atomic_dec(&guestDeviceActive);
+
+ VMCIQPGuestEndpoints_Exit();
+ VMCIUtil_Exit();
+
+ mutex_lock(&dev->lock);
+
+ atomic_set(&vmci_dev.datagrams_allowed, 0);
+
+ printk(KERN_INFO "Resetting vmci device\n");
+ outl(VMCI_CONTROL_RESET, vmci_dev.ioaddr + VMCI_CONTROL_ADDR);
+
+ /*
+ * Free IRQ and then disable MSI/MSI-X as appropriate. For MSI-X, we might
+ * have multiple vectors, each with their own IRQ, which we must free too.
+ */
+
+ free_irq(dev->irq, dev);
+ if (dev->intr_type == VMCI_INTR_TYPE_MSIX) {
+ if (dev->exclusive_vectors) {
+ free_irq(dev->msix_entries[1].vector, dev);
+ }
+ pci_disable_msix(pdev);
+ } else if (dev->intr_type == VMCI_INTR_TYPE_MSI) {
+ pci_disable_msi(pdev);
+ }
+ dev->exclusive_vectors = false;
+ dev->intr_type = VMCI_INTR_TYPE_INTX;
+
+ release_region(dev->ioaddr, dev->ioaddr_size);
+ dev->enabled = false;
+ if (notification_bitmap) {
+ /*
+ * The device reset above cleared the bitmap state of the
+ * device, so we can safely free it here.
+ */
+
+ vfree(notification_bitmap);
+ notification_bitmap = NULL;
+ }
+
+ printk(KERN_INFO "Unregistered vmci device.\n");
+ mutex_unlock(&dev->lock);
+
+ pci_disable_device(pdev);
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCI_DeviceEnabled --
+ *
+ * Checks whether the VMCI device is enabled.
+ *
+ * Results:
+ * true if device is enabled, false otherwise.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+bool VMCI_DeviceEnabled(void)
+{
+ return VMCI_GuestPersonalityActive()
+ || VMCI_HostPersonalityActive();
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCI_SendDatagram --
+ *
+ * VM to hypervisor call mechanism. We use the standard VMware naming
+ * convention since shared code is calling this function as well.
+ *
+ * Results:
+ * The result of the hypercall.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+int VMCI_SendDatagram(struct vmci_datagram *dg)
+{
+ unsigned long flags;
+ int result;
+
+ /* Check args. */
+ if (dg == NULL) {
+ return VMCI_ERROR_INVALID_ARGS;
+ }
+
+ if (atomic_read(&vmci_dev.datagrams_allowed) == 0) {
+ return VMCI_ERROR_UNAVAILABLE;
+ }
+
+ /*
+ * Need to acquire spinlock on the device because
+ * the datagram data may be spread over multiple pages and the monitor may
+ * interleave device user rpc calls from multiple VCPUs. Acquiring the
+ * spinlock precludes that possibility. Disabling interrupts to avoid
+ * incoming datagrams during a "rep out" and possibly landing up in this
+ * function.
+ */
+ spin_lock_irqsave(&vmci_dev.dev_spinlock, flags);
+
+ /*
+ * Send the datagram and retrieve the return value from the result register.
+ */
+ __asm__ __volatile__("cld\n\t" "rep outsb\n\t": /* No output. */
+ :"d"(vmci_dev.ioaddr + VMCI_DATA_OUT_ADDR),
+ "c"(VMCI_DG_SIZE(dg)), "S"(dg)
+ );
+
+ /*
+ * XXX Should read result high port as well when updating handlers to
+ * return 64bit.
+ */
+ result = inl(vmci_dev.ioaddr + VMCI_RESULT_LOW_ADDR);
+ spin_unlock_irqrestore(&vmci_dev.dev_spinlock, flags);
+
+ return result;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Shared functions --
+ *
+ * Functions shared between host and guest personality.
+ *
+ *----------------------------------------------------------------------
+ */
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCI_GuestPersonalityActive --
+ *
+ * Determines whether the VMCI PCI device has been successfully
+ * initialized.
+ *
+ * Results:
+ * true, if VMCI guest device is operational, false otherwise.
+ *
+ * Side effects:
+ * Reads data from the device.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+bool VMCI_GuestPersonalityActive(void)
+{
+ return guestDeviceInit && atomic_read(&guestDeviceActive) > 0;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCI_HostPersonalityActive --
+ *
+ * Determines whether the VMCI host personality is
+ * available. Since the core functionality of the host driver is
+ * always present, all guests could possibly use the host
+ * personality. However, to minimize the deviation from the
+ * pre-unified driver state of affairs, we only consider the host
+ * device active, if there is no active guest device, or if there
+ * are VMX'en with active VMCI contexts using the host device.
+ *
+ * Results:
+ * true, if VMCI host driver is operational, false otherwise.
+ *
+ * Side effects:
+ * Reads data from the device.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+bool VMCI_HostPersonalityActive(void)
+{
+ return hostDeviceInit &&
+ (!VMCI_GuestPersonalityActive() ||
+ atomic_read(&linuxState.activeContexts) > 0);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Module definitions --
+ *
+ * Implements support for module load/unload.
+ *
+ *----------------------------------------------------------------------
+ */
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * vmci_init --
+ *
+ * linux module entry point. Called by /sbin/insmod command
+ *
+ * Results:
+ * registers a device driver for a major # that depends
+ * on the uid. Add yourself to that list. List is now in
+ * private/driver-private.c.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int __init vmci_init(void)
+{
+ int retval;
+
+ retval = VMCI_SharedInit();
+ if (retval != VMCI_SUCCESS) {
+ Warning(LGPFX
+ "Failed to initialize VMCI common components (err=%d).\n",
+ retval);
+ return -ENOMEM;
+ }
+
+ if (vmci_disable_guest) {
+ guestDeviceInit = 0;
+ } else {
+ retval = vmci_guest_init();
+ if (retval != 0) {
+ Warning(LGPFX
+ "VMCI PCI device not initialized (err=%d).\n",
+ retval);
+ }
+ guestDeviceInit = (retval == 0);
+ if (VMCI_GuestPersonalityActive()) {
+ printk(KERN_INFO LGPFX "Using guest personality\n");
+ }
+ }
+
+ if (vmci_disable_host) {
+ hostDeviceInit = 0;
+ } else {
+ retval = vmci_host_init();
+ if (retval != 0) {
+ Warning(LGPFX
+ "Unable to initialize host personality (err=%d).\n",
+ retval);
+ }
+ hostDeviceInit = (retval == 0);
+ if (hostDeviceInit) {
+ printk(KERN_INFO LGPFX "Using host personality\n");
+ }
+ }
+
+ if (!guestDeviceInit && !hostDeviceInit) {
+ VMCI_SharedCleanup();
+ return -ENODEV;
+ }
+
+ printk(KERN_INFO LGPFX "Module (name=%s) is initialized\n",
+ linuxState.deviceName);
+
+ return 0;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * vmci_exit --
+ *
+ * Called by /sbin/rmmod
+ *
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void __exit vmci_exit(void)
+{
+ int retval;
+
+ if (guestDeviceInit) {
+ pci_unregister_driver(&vmci_driver);
+ vfree(data_buffer);
+ guestDeviceInit = false;
+ }
+
+ if (hostDeviceInit) {
+ VMCI_HostCleanup();
+
+ retval = misc_deregister(&linuxState.misc);
+ if (retval) {
+ Warning(LGPFX "Module %s: error unregistering\n",
+ linuxState.deviceName);
+ } else {
+ printk(KERN_INFO LGPFX "Module %s: unloaded\n",
+ linuxState.deviceName);
+ }
+
+ hostDeviceInit = false;
+ }
+
+ VMCI_SharedCleanup();
+}
+
+module_init(vmci_init);
+module_exit(vmci_exit);
+MODULE_DEVICE_TABLE(pci, vmci_ids);
+
+module_param_named(disable_host, vmci_disable_host, bool, 0);
+MODULE_PARM_DESC(disable_host, "Disable driver host personality - (default=0)");
+
+module_param_named(disable_guest, vmci_disable_guest, bool, 0);
+MODULE_PARM_DESC(disable_guest,
+ "Disable driver guest personality - (default=0)");
+
+module_param_named(disable_msi, vmci_disable_msi, bool, 0);
+MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)");
+
+module_param_named(disable_msix, vmci_disable_msix, bool, 0);
+MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)");
+
+MODULE_AUTHOR("VMware, Inc.");
+MODULE_DESCRIPTION("VMware Virtual Machine Communication Interface (VMCI).");
+MODULE_VERSION(VMCI_DRIVER_VERSION_STRING);
+MODULE_LICENSE("GPL v2");
+
+/*
+ * Starting with SLE10sp2, Novell requires that IHVs sign a support agreement
+ * with them and mark their kernel modules as externally supported via a
+ * change to the module header. If this isn't done, the module will not load
+ * by default (i.e., neither mkinitrd nor modprobe will accept it).
+ */
+MODULE_INFO(supported, "external");
diff --git a/drivers/misc/vmw_vmci/vmciKernelIf.c b/drivers/misc/vmw_vmci/vmciKernelIf.c
new file mode 100644
index 0000000..7001149
--- /dev/null
+++ b/drivers/misc/vmw_vmci/vmciKernelIf.c
@@ -0,0 +1,1351 @@
+/*
+ *
+ * VMware VMCI Driver
+ *
+ * Copyright (C) 2012 VMware, Inc. All rights reserved.
+ *
+ * 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 version 2 and no later version.
+ *
+ * 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/mm.h> /* For vmalloc_to_page() and get_user_pages() */
+#include <linux/pagemap.h> /* For page_cache_release() */
+#include <linux/sched.h>
+#include <linux/semaphore.h>
+#include <linux/socket.h> /* For memcpy_{to,from}iovec(). */
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/version.h>
+#include <linux/vmalloc.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+
+#include "vmci_iocontrols.h"
+#include "vmci_kernel_if.h"
+#include "vmciQueue.h"
+#include "vmciQueuePair.h"
+
+/* The Kernel specific component of the struct vmci_queue structure. */
+struct vmci_queue_kern_if {
+ struct page **page;
+ struct page **headerPage;
+ struct semaphore __mutex;
+ struct semaphore *mutex;
+ bool host;
+ size_t numPages;
+};
+
+struct vmci_dlyd_wrk_info {
+ struct work_struct work;
+ VMCIWorkFn *workFn;
+ void *data;
+};
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * VMCIHost_WaitForCallLocked --
+ *
+ * Wait until a VMCI call is pending or the waiting thread is
+ * interrupted. It is assumed that a lock is held prior to
+ * calling this function. The lock will be released during the
+ * wait. The correctnes of this funtion depends on that the same
+ * lock is held when the call is signalled.
+ *
+ * Results:
+ * true on success
+ * false if the wait was interrupted.
+ *
+ * Side effects:
+ * The call may block.
+ *
+ *----------------------------------------------------------------------
+ */
+
+bool VMCIHost_WaitForCallLocked(struct vmci_host *hostContext, // IN
+ spinlock_t * lock, // IN
+ unsigned long *flags, // IN
+ bool useBH) // IN
+{
+ DECLARE_WAITQUEUE(wait, current);
+
+ /*
+ * The thread must be added to the wait queue and have its state
+ * changed while holding the lock - otherwise a signal may change
+ * the state in between and have it overwritten causing a loss of
+ * the event.
+ */
+
+ add_wait_queue(&hostContext->waitQueue, &wait);
+ current->state = TASK_INTERRUPTIBLE;
+
+ if (useBH) {
+ spin_unlock_bh(lock);
+ } else {
+ spin_unlock(lock);
+ }
+
+ schedule();
+
+ if (useBH) {
+ spin_lock_bh(lock);
+ } else {
+ spin_lock(lock);
+ }
+
+ current->state = TASK_RUNNING;
+
+ remove_wait_queue(&hostContext->waitQueue, &wait);
+
+ if (signal_pending(current))
+ return false;
+
+ return true;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIHost_CompareUser --
+ *
+ * Determines whether the two users are the same.
+ *
+ * Results:
+ * VMCI_SUCCESS if equal, error code otherwise.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+int VMCIHost_CompareUser(uid_t * user1, uid_t * user2)
+{
+ if (!user1 || !user2)
+ return VMCI_ERROR_INVALID_ARGS;
+
+ if (*user1 == *user2)
+ return VMCI_SUCCESS;
+
+ return VMCI_ERROR_GENERIC;
+}
+
+/*
+ *----------------------------------------------------------------------------
+ *
+ * VMCIDelayedWorkCB
+ *
+ * Called in a worker thread context.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------------
+ */
+
+static void VMCIDelayedWorkCB(struct work_struct *work) // IN
+{
+ struct vmci_dlyd_wrk_info *delayedWorkInfo;
+
+ delayedWorkInfo = container_of(work, struct vmci_dlyd_wrk_info, work);
+ ASSERT(delayedWorkInfo);
+ ASSERT(delayedWorkInfo->workFn);
+
+ delayedWorkInfo->workFn(delayedWorkInfo->data);
+
+ kfree(delayedWorkInfo);
+}
+
+/*
+ *----------------------------------------------------------------------------
+ *
+ * VMCI_ScheduleDelayedWork --
+ *
+ * Schedule the specified callback.
+ *
+ * Results:
+ * Zero on success, error code otherwise.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------------
+ */
+
+int VMCI_ScheduleDelayedWork(VMCIWorkFn * workFn, // IN
+ void *data) // IN
+{
+ struct vmci_dlyd_wrk_info *delayedWorkInfo;
+
+ ASSERT(workFn);
+
+ delayedWorkInfo = kmalloc(sizeof *delayedWorkInfo, GFP_ATOMIC);
+ if (!delayedWorkInfo)
+ return VMCI_ERROR_NO_MEM;
+
+ delayedWorkInfo->workFn = workFn;
+ delayedWorkInfo->data = data;
+
+ INIT_WORK(&delayedWorkInfo->work, VMCIDelayedWorkCB);
+
+ schedule_work(&delayedWorkInfo->work);
+
+ return VMCI_SUCCESS;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCI_WaitOnEvent --
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+void VMCI_WaitOnEvent(wait_queue_head_t * event, // IN:
+ VMCIEventReleaseCB releaseCB, // IN:
+ void *clientData) // IN:
+{
+ /*
+ * XXX Should this be a TASK_UNINTERRUPTIBLE wait? I'm leaving it
+ * as it was for now.
+ */
+ VMCI_WaitOnEventInterruptible(event, releaseCB, clientData);
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCI_WaitOnEventInterruptible --
+ *
+ * Results:
+ * True if the wait was interrupted by a signal, false otherwise.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+bool VMCI_WaitOnEventInterruptible(wait_queue_head_t * event, // IN:
+ VMCIEventReleaseCB releaseCB, // IN:
+ void *clientData) // IN:
+{
+ DECLARE_WAITQUEUE(wait, current);
+
+ if (event == NULL || releaseCB == NULL)
+ return false;
+
+ add_wait_queue(event, &wait);
+ current->state = TASK_INTERRUPTIBLE;
+
+ /*
+ * Release the lock or other primitive that makes it possible for us to
+ * put the current thread on the wait queue without missing the signal.
+ * Ie. on Linux we need to put ourselves on the wait queue and set our
+ * stateto TASK_INTERRUPTIBLE without another thread signalling us.
+ * The releaseCB is used to synchronize this.
+ */
+ releaseCB(clientData);
+
+ schedule();
+ current->state = TASK_RUNNING;
+ remove_wait_queue(event, &wait);
+
+ return signal_pending(current);
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCI_AllocQueue --
+ *
+ * Allocates kernel VA space of specified size, plus space for the
+ * queue structure/kernel interface and the queue header. Allocates
+ * physical pages for the queue data pages.
+ *
+ * PAGE m: struct vmci_queue_header (struct vmci_queue->qHeader)
+ * PAGE m+1: struct vmci_queue
+ * PAGE m+1+q: struct vmci_queue_kern_if (struct vmci_queue->kernelIf)
+ * PAGE n-size: Data pages (struct vmci_queue->kernelIf->page[])
+ *
+ * Results:
+ * Pointer to the queue on success, NULL otherwise.
+ *
+ * Side effects:
+ * Memory is allocated.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+void *VMCI_AllocQueue(uint64_t size) // IN: size of queue (not including header)
+{
+ uint64_t i;
+ struct vmci_queue *queue;
+ struct vmci_queue_header *qHeader;
+ const uint64_t numDataPages = CEILING(size, PAGE_SIZE);
+ const uint queueSize =
+ PAGE_SIZE +
+ sizeof *queue + sizeof *(queue->kernelIf) +
+ numDataPages * sizeof *(queue->kernelIf->page);
+
+ /*
+ * Size should be enforced by VMCIQPair_Alloc(), double-check here.
+ * Allocating too much on Linux can cause the system to become
+ * unresponsive, because we allocate page-by-page, and we allow the
+ * system to wait for pages rather than fail.
+ */
+ if (size > VMCI_MAX_GUEST_QP_MEMORY) {
+ ASSERT(false);
+ return NULL;
+ }
+
+ qHeader = (struct vmci_queue_header *)vmalloc(queueSize);
+ if (!qHeader)
+ return NULL;
+
+ queue = (struct vmci_queue *)((uint8_t *) qHeader + PAGE_SIZE);
+ queue->qHeader = qHeader;
+ queue->savedHeader = NULL;
+ queue->kernelIf =
+ (struct vmci_queue_kern_if *)((uint8_t *) queue + sizeof *queue);
+ queue->kernelIf->headerPage = NULL; // Unused in guest.
+ queue->kernelIf->page =
+ (struct page **)((uint8_t *) queue->kernelIf +
+ sizeof *(queue->kernelIf));
+ queue->kernelIf->host = false;
+
+ for (i = 0; i < numDataPages; i++) {
+ queue->kernelIf->page[i] = alloc_pages(GFP_KERNEL, 0);
+ if (!queue->kernelIf->page[i]) {
+ while (i) {
+ __free_page(queue->kernelIf->page[--i]);
+ }
+ vfree(qHeader);
+ return NULL;
+ }
+ }
+
+ return (void *)queue;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCI_FreeQueue --
+ *
+ * Frees kernel VA space for a given queue and its queue header, and
+ * frees physical data pages.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * Memory is freed.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+void VMCI_FreeQueue(void *q, // IN:
+ uint64_t size) // IN: size of queue (not including header)
+{
+ struct vmci_queue *queue = q;
+
+ if (queue) {
+ uint64_t i;
+ for (i = 0; i < CEILING(size, PAGE_SIZE); i++) {
+ __free_page(queue->kernelIf->page[i]);
+ }
+ vfree(queue->qHeader);
+ }
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCI_AllocPPNSet --
+ *
+ * Allocates two list of PPNs --- one for the pages in the produce queue,
+ * and the other for the pages in the consume queue. Intializes the list
+ * of PPNs with the page frame numbers of the KVA for the two queues (and
+ * the queue headers).
+ *
+ * Results:
+ * Success or failure.
+ *
+ * Side effects:
+ * Memory may be allocated.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+int VMCI_AllocPPNSet(void *prodQ, // IN:
+ uint64_t numProducePages, // IN: for queue plus header
+ void *consQ, // IN:
+ uint64_t numConsumePages, // IN: for queue plus header
+ struct PPNSet *ppnSet) // OUT:
+{
+ uint32_t *producePPNs;
+ uint32_t *consumePPNs;
+ struct vmci_queue *produceQ = prodQ;
+ struct vmci_queue *consumeQ = consQ;
+ uint64_t i;
+
+ if (!produceQ || !numProducePages || !consumeQ ||
+ !numConsumePages || !ppnSet)
+ return VMCI_ERROR_INVALID_ARGS;
+
+ if (ppnSet->initialized)
+ return VMCI_ERROR_ALREADY_EXISTS;
+
+ producePPNs =
+ kmalloc(numProducePages * sizeof *producePPNs, GFP_KERNEL);
+ if (!producePPNs)
+ return VMCI_ERROR_NO_MEM;
+
+ consumePPNs =
+ kmalloc(numConsumePages * sizeof *consumePPNs, GFP_KERNEL);
+ if (!consumePPNs) {
+ kfree(producePPNs);
+ return VMCI_ERROR_NO_MEM;
+ }
+
+ producePPNs[0] = page_to_pfn(vmalloc_to_page(produceQ->qHeader));
+ for (i = 1; i < numProducePages; i++) {
+ unsigned long pfn;
+
+ producePPNs[i] = pfn =
+ page_to_pfn(produceQ->kernelIf->page[i - 1]);
+
+ /* Fail allocation if PFN isn't supported by hypervisor. */
+ if (sizeof pfn > sizeof *producePPNs && pfn != producePPNs[i])
+ goto ppnError;
+ }
+ consumePPNs[0] = page_to_pfn(vmalloc_to_page(consumeQ->qHeader));
+ for (i = 1; i < numConsumePages; i++) {
+ unsigned long pfn;
+
+ consumePPNs[i] = pfn =
+ page_to_pfn(consumeQ->kernelIf->page[i - 1]);
+
+ /* Fail allocation if PFN isn't supported by hypervisor. */
+ if (sizeof pfn > sizeof *consumePPNs && pfn != consumePPNs[i])
+ goto ppnError;
+ }
+
+ ppnSet->numProducePages = numProducePages;
+ ppnSet->numConsumePages = numConsumePages;
+ ppnSet->producePPNs = producePPNs;
+ ppnSet->consumePPNs = consumePPNs;
+ ppnSet->initialized = true;
+ return VMCI_SUCCESS;
+
+ ppnError:
+ kfree(producePPNs);
+ kfree(consumePPNs);
+ return VMCI_ERROR_INVALID_ARGS;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCI_FreePPNSet --
+ *
+ * Frees the two list of PPNs for a queue pair.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+void VMCI_FreePPNSet(struct PPNSet *ppnSet) // IN:
+{
+ ASSERT(ppnSet);
+ if (ppnSet->initialized) {
+ /* Do not call these functions on NULL inputs. */
+ ASSERT(ppnSet->producePPNs && ppnSet->consumePPNs);
+ kfree(ppnSet->producePPNs);
+ kfree(ppnSet->consumePPNs);
+ }
+ memset(ppnSet, 0, sizeof *ppnSet);
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCI_PopulatePPNList --
+ *
+ * Populates the list of PPNs in the hypercall structure with the PPNS
+ * of the produce queue and the consume queue.
+ *
+ * Results:
+ * VMCI_SUCCESS.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+int VMCI_PopulatePPNList(uint8_t * callBuf, // OUT:
+ const struct PPNSet *ppnSet) // IN:
+{
+ ASSERT(callBuf && ppnSet && ppnSet->initialized);
+ memcpy(callBuf, ppnSet->producePPNs,
+ ppnSet->numProducePages * sizeof *ppnSet->producePPNs);
+ memcpy(callBuf +
+ ppnSet->numProducePages * sizeof *ppnSet->producePPNs,
+ ppnSet->consumePPNs,
+ ppnSet->numConsumePages * sizeof *ppnSet->consumePPNs);
+
+ return VMCI_SUCCESS;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * __VMCIMemcpyToQueue --
+ *
+ * Copies from a given buffer or iovector to a VMCI Queue. Uses
+ * kmap()/kunmap() to dynamically map/unmap required portions of the queue
+ * by traversing the offset -> page translation structure for the queue.
+ * Assumes that offset + size does not wrap around in the queue.
+ *
+ * Results:
+ * Zero on success, negative error code on failure.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+int __VMCIMemcpyToQueue(struct vmci_queue *queue, // OUT:
+ uint64_t queueOffset, // IN:
+ const void *src, // IN:
+ size_t size, // IN:
+ bool isIovec) // IN: if src is a struct iovec *
+{
+ struct vmci_queue_kern_if *kernelIf = queue->kernelIf;
+ size_t bytesCopied = 0;
+
+ while (bytesCopied < size) {
+ uint64_t pageIndex = (queueOffset + bytesCopied) / PAGE_SIZE;
+ size_t pageOffset =
+ (queueOffset + bytesCopied) & (PAGE_SIZE - 1);
+ void *va = kmap(kernelIf->page[pageIndex]);
+ size_t toCopy;
+
+ ASSERT(va);
+ if (size - bytesCopied > PAGE_SIZE - pageOffset) {
+ /* Enough payload to fill up from this page. */
+ toCopy = PAGE_SIZE - pageOffset;
+ } else {
+ toCopy = size - bytesCopied;
+ }
+
+ if (isIovec) {
+ struct iovec *iov = (struct iovec *)src;
+ int err;
+
+ /* The iovec will track bytesCopied internally. */
+ err =
+ memcpy_fromiovec((uint8_t *) va + pageOffset,
+ iov, toCopy);
+ if (err != 0) {
+ kunmap(kernelIf->page[pageIndex]);
+ return VMCI_ERROR_INVALID_ARGS;
+ }
+ } else {
+ memcpy((uint8_t *) va + pageOffset,
+ (uint8_t *) src + bytesCopied, toCopy);
+ }
+
+ bytesCopied += toCopy;
+ kunmap(kernelIf->page[pageIndex]);
+ }
+
+ return VMCI_SUCCESS;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * __VMCIMemcpyFromQueue --
+ *
+ * Copies to a given buffer or iovector from a VMCI Queue. Uses
+ * kmap()/kunmap() to dynamically map/unmap required portions of the queue
+ * by traversing the offset -> page translation structure for the queue.
+ * Assumes that offset + size does not wrap around in the queue.
+ *
+ * Results:
+ * Zero on success, negative error code on failure.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+int __VMCIMemcpyFromQueue(void *dest, // OUT:
+ const struct vmci_queue *queue, // IN:
+ uint64_t queueOffset, // IN:
+ size_t size, // IN:
+ bool isIovec) // IN: if dest is a struct iovec *
+{
+ struct vmci_queue_kern_if *kernelIf = queue->kernelIf;
+ size_t bytesCopied = 0;
+
+ while (bytesCopied < size) {
+ uint64_t pageIndex = (queueOffset + bytesCopied) / PAGE_SIZE;
+ size_t pageOffset =
+ (queueOffset + bytesCopied) & (PAGE_SIZE - 1);
+ void *va = kmap(kernelIf->page[pageIndex]);
+ size_t toCopy;
+
+ ASSERT(va);
+ if (size - bytesCopied > PAGE_SIZE - pageOffset) {
+ /* Enough payload to fill up this page. */
+ toCopy = PAGE_SIZE - pageOffset;
+ } else {
+ toCopy = size - bytesCopied;
+ }
+
+ if (isIovec) {
+ struct iovec *iov = (struct iovec *)dest;
+ int err;
+
+ /* The iovec will track bytesCopied internally. */
+ err =
+ memcpy_toiovec(iov,
+ (uint8_t *) va + pageOffset, toCopy);
+ if (err != 0) {
+ kunmap(kernelIf->page[pageIndex]);
+ return VMCI_ERROR_INVALID_ARGS;
+ }
+ } else {
+ memcpy((uint8_t *) dest + bytesCopied,
+ (uint8_t *) va + pageOffset, toCopy);
+ }
+
+ bytesCopied += toCopy;
+ kunmap(kernelIf->page[pageIndex]);
+ }
+
+ return VMCI_SUCCESS;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIMemcpyToQueue --
+ *
+ * Copies from a given buffer to a VMCI Queue.
+ *
+ * Results:
+ * Zero on success, negative error code on failure.
+ *
+ * Side effects:
+ * None.
+ *
+ * XXX: REMOVE
+ *-----------------------------------------------------------------------------
+ */
+
+int VMCIMemcpyToQueue(struct vmci_queue *queue, // OUT:
+ uint64_t queueOffset, // IN:
+ const void *src, // IN:
+ size_t srcOffset, // IN:
+ size_t size, // IN:
+ int bufType) // IN: Unused
+{
+ return __VMCIMemcpyToQueue(queue, queueOffset,
+ (uint8_t *) src + srcOffset, size, false);
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIMemcpyFromQueue --
+ *
+ * Copies to a given buffer from a VMCI Queue.
+ *
+ * Results:
+ * Zero on success, negative error code on failure.
+ *
+ * Side effects:
+ * None.
+ *
+ * XXX: REMOVE
+ *-----------------------------------------------------------------------------
+ */
+
+int VMCIMemcpyFromQueue(void *dest, // OUT:
+ size_t destOffset, // IN:
+ const struct vmci_queue *queue, // IN:
+ uint64_t queueOffset, // IN:
+ size_t size, // IN:
+ int bufType) // IN: Unused
+{
+ return __VMCIMemcpyFromQueue((uint8_t *) dest + destOffset,
+ queue, queueOffset, size, false);
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIMemcpyToQueueLocal --
+ *
+ * Copies from a given buffer to a local VMCI queue. On Linux, this is the
+ * same as a regular copy.
+ *
+ * Results:
+ * Zero on success, negative error code on failure.
+ *
+ * Side effects:
+ * None.
+ *
+ * XXX: REMOVE
+ *-----------------------------------------------------------------------------
+ */
+
+int VMCIMemcpyToQueueLocal(struct vmci_queue *queue, // OUT
+ uint64_t queueOffset, // IN
+ const void *src, // IN
+ size_t srcOffset, // IN
+ size_t size, // IN
+ int bufType) // IN
+{
+ return __VMCIMemcpyToQueue(queue, queueOffset,
+ (uint8_t *) src + srcOffset, size, false);;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIMemcpyFromQueueLocal --
+ *
+ * Copies to a given buffer from a VMCI Queue.
+ *
+ * Results:
+ * Zero on success, negative error code on failure.
+ *
+ * Side effects:
+ * None.
+ *
+ * XXX: REMOVE
+ *-----------------------------------------------------------------------------
+ */
+
+int VMCIMemcpyFromQueueLocal(void *dest, // OUT:
+ size_t destOffset, // IN:
+ const struct vmci_queue *queue, // IN:
+ uint64_t queueOffset, // IN:
+ size_t size, // IN:
+ int bufType) // IN: Unused
+{
+ return __VMCIMemcpyFromQueue((uint8_t *) dest + destOffset,
+ queue, queueOffset, size, false);
+}
+
+/*
+ *----------------------------------------------------------------------------
+ *
+ * VMCIMemcpyToQueueV --
+ *
+ * Copies from a given iovec from a VMCI Queue.
+ *
+ * Results:
+ * Zero on success, negative error code on failure.
+ *
+ * Side effects:
+ * None.
+ *
+ * XXX: REMOVE
+ *----------------------------------------------------------------------------
+ */
+
+int VMCIMemcpyToQueueV(struct vmci_queue *queue, // OUT:
+ uint64_t queueOffset, // IN:
+ const void *src, // IN: iovec
+ size_t srcOffset, // IN: ignored
+ size_t size, // IN:
+ int bufType) // IN: ignored
+{
+
+ /*
+ * We ignore srcOffset because src is really a struct iovec * and will
+ * maintain offset internally.
+ */
+ return __VMCIMemcpyToQueue(queue, queueOffset, src, size, true);
+}
+
+/*
+ *----------------------------------------------------------------------------
+ *
+ * VMCIMemcpyFromQueueV --
+ *
+ * Copies to a given iovec from a VMCI Queue.
+ *
+ * Results:
+ * Zero on success, negative error code on failure.
+ *
+ * Side effects:
+ * None.
+ *
+ * XXX: REMOVE
+ *----------------------------------------------------------------------------
+ */
+
+int VMCIMemcpyFromQueueV(void *dest, // OUT: iovec
+ size_t destOffset, // IN: ignored
+ const struct vmci_queue *queue, // IN:
+ uint64_t queueOffset, // IN:
+ size_t size, // IN:
+ int bufType) // IN: ignored
+{
+ /*
+ * We ignore destOffset because dest is really a struct iovec * and will
+ * maintain offset internally.
+ */
+ return __VMCIMemcpyFromQueue(dest, queue, queueOffset, size, true);
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIWellKnownID_AllowMap --
+ *
+ * Checks whether the calling context is allowed to register for the given
+ * well known service ID. Currently returns false if the service ID is
+ * within the reserved range and VMCI_PRIVILEGE_FLAG_TRUSTED is not
+ * provided as the input privilege flags. Otherwise returns true.
+ * XXX TODO access control based on host configuration information; this
+ * will be platform specific implementation.
+ *
+ * Results:
+ * Boolean value indicating access granted or denied.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+bool VMCIWellKnownID_AllowMap(uint32_t wellKnownID, // IN:
+ uint32_t privFlags) // IN:
+{
+ return (!(wellKnownID < VMCI_RESERVED_RESOURCE_ID_MAX &&
+ !(privFlags & VMCI_PRIVILEGE_FLAG_TRUSTED)));
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIHost_AllocQueue --
+ *
+ * Allocates kernel VA space of specified size plus space for the queue
+ * and kernel interface. This is different from the guest queue allocator,
+ * because we do not allocate our own queue header/data pages here but
+ * share those of the guest.
+ *
+ * Results:
+ * A pointer to an allocated and initialized struct vmci_queue structure or NULL.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+struct vmci_queue *VMCIHost_AllocQueue(uint64_t size) // IN:
+{
+ struct vmci_queue *queue;
+ const size_t numPages = CEILING(size, PAGE_SIZE) + 1;
+ const size_t queueSize = sizeof *queue + sizeof *(queue->kernelIf);
+ const size_t queuePageSize = numPages * sizeof *queue->kernelIf->page;
+
+ queue = kmalloc(queueSize + queuePageSize, GFP_KERNEL);
+ if (queue) {
+ queue->qHeader = NULL;
+ queue->savedHeader = NULL;
+ queue->kernelIf =
+ (struct vmci_queue_kern_if *)((uint8_t *) queue +
+ sizeof *queue);
+ queue->kernelIf->host = true;
+ queue->kernelIf->mutex = NULL;
+ queue->kernelIf->numPages = numPages;
+ queue->kernelIf->headerPage =
+ (struct page **)((uint8_t *) queue + queueSize);
+ queue->kernelIf->page = &queue->kernelIf->headerPage[1];
+ memset(queue->kernelIf->headerPage, 0,
+ sizeof *queue->kernelIf->headerPage *
+ queue->kernelIf->numPages);
+ }
+
+ return queue;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIHost_FreeQueue --
+ *
+ * Frees kernel memory for a given queue (header plus translation
+ * structure).
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * Memory is freed.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+void VMCIHost_FreeQueue(struct vmci_queue *queue, // IN:
+ uint64_t queueSize) // IN:
+{
+ if (queue)
+ kfree(queue);
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCI_InitQueueMutex()
+ *
+ * Initialize the mutex for the pair of queues. This mutex is used to
+ * protect the qHeader and the buffer from changing out from under any
+ * users of either queue. Of course, it's only any good if the mutexes
+ * are actually acquired. Queue structure must lie on non-paged memory
+ * or we cannot guarantee access to the mutex.
+ *
+ * Results:
+ * None.
+ *
+ * Side Effects:
+ * None.
+ *
+ *----------------------------------------------------------------------------
+ */
+
+void VMCI_InitQueueMutex(struct vmci_queue *produceQ, // IN/OUT
+ struct vmci_queue *consumeQ) // IN/OUT
+{
+ ASSERT(produceQ);
+ ASSERT(consumeQ);
+ ASSERT(produceQ->kernelIf);
+ ASSERT(consumeQ->kernelIf);
+
+ /*
+ * Only the host queue has shared state - the guest queues do not
+ * need to synchronize access using a queue mutex.
+ */
+
+ if (produceQ->kernelIf->host) {
+ produceQ->kernelIf->mutex = &produceQ->kernelIf->__mutex;
+ consumeQ->kernelIf->mutex = &produceQ->kernelIf->__mutex;
+ sema_init(produceQ->kernelIf->mutex, 1);
+ }
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCI_CleanupQueueMutex()
+ *
+ * Cleans up the mutex for the pair of queues.
+ *
+ * Results:
+ * None.
+ *
+ * Side Effects:
+ * None.
+ *
+ *----------------------------------------------------------------------------
+ */
+
+void VMCI_CleanupQueueMutex(struct vmci_queue *produceQ, // IN/OUT
+ struct vmci_queue *consumeQ) // IN/OUT
+{
+ ASSERT(produceQ);
+ ASSERT(consumeQ);
+ ASSERT(produceQ->kernelIf);
+ ASSERT(consumeQ->kernelIf);
+
+ if (produceQ->kernelIf->host) {
+ produceQ->kernelIf->mutex = NULL;
+ consumeQ->kernelIf->mutex = NULL;
+ }
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCI_AcquireQueueMutex()
+ *
+ * Acquire the mutex for the queue. Note that the produceQ and
+ * the consumeQ share a mutex. So, only one of the two need to
+ * be passed in to this routine. Either will work just fine.
+ *
+ * Results:
+ * None.
+ *
+ * Side Effects:
+ * May block the caller.
+ *
+ *----------------------------------------------------------------------------
+ */
+
+void VMCI_AcquireQueueMutex(struct vmci_queue *queue) // IN
+{
+ ASSERT(queue);
+ ASSERT(queue->kernelIf);
+
+ if (queue->kernelIf->host) {
+ ASSERT(queue->kernelIf->mutex);
+ down(queue->kernelIf->mutex);
+ }
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCI_ReleaseQueueMutex()
+ *
+ * Release the mutex for the queue. Note that the produceQ and
+ * the consumeQ share a mutex. So, only one of the two need to
+ * be passed in to this routine. Either will work just fine.
+ *
+ * Results:
+ * None.
+ *
+ * Side Effects:
+ * May block the caller.
+ *
+ *----------------------------------------------------------------------------
+ */
+
+void VMCI_ReleaseQueueMutex(struct vmci_queue *queue) // IN
+{
+ ASSERT(queue);
+ ASSERT(queue->kernelIf);
+
+ if (queue->kernelIf->host) {
+ ASSERT(queue->kernelIf->mutex);
+ up(queue->kernelIf->mutex);
+ }
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIReleasePageStorePages --
+ *
+ * Helper function to release pages in the PageStoreAttachInfo
+ * previously obtained using get_user_pages.
+ *
+ * Results:
+ * None.
+ *
+ * Side Effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+static void VMCIReleasePages(struct page **pages, // IN
+ uint64_t numPages, // IN
+ bool dirty) // IN
+{
+ int i;
+
+ for (i = 0; i < numPages; i++) {
+ ASSERT(pages[i]);
+
+ if (dirty)
+ set_page_dirty(pages[i]);
+
+ page_cache_release(pages[i]);
+ pages[i] = NULL;
+ }
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIHost_RegisterUserMemory --
+ *
+ * Registers the specification of the user pages used for backing a queue
+ * pair. Enough information to map in pages is stored in the OS specific
+ * part of the struct vmci_queue structure.
+ *
+ * Results:
+ * VMCI_SUCCESS on sucess, negative error code on failure.
+ *
+ * Side Effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+int VMCIHost_RegisterUserMemory(QueuePairPageStore * pageStore, // IN
+ struct vmci_queue *produceQ, // OUT
+ struct vmci_queue *consumeQ) // OUT
+{
+ uint64_t produceUVA;
+ uint64_t consumeUVA;
+
+ ASSERT(produceQ->kernelIf->headerPage
+ && consumeQ->kernelIf->headerPage);
+
+ /*
+ * The new style and the old style mapping only differs in that we either
+ * get a single or two UVAs, so we split the single UVA range at the
+ * appropriate spot.
+ */
+
+ produceUVA = pageStore->pages;
+ consumeUVA =
+ pageStore->pages + produceQ->kernelIf->numPages * PAGE_SIZE;
+ return VMCIHost_GetUserMemory(produceUVA, consumeUVA, produceQ,
+ consumeQ);
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIHost_UnregisterUserMemory --
+ *
+ * Releases and removes the references to user pages stored in the attach
+ * struct.
+ *
+ * Results:
+ * None
+ *
+ * Side Effects:
+ * Pages are released from the page cache and may become
+ * swappable again.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+void VMCIHost_UnregisterUserMemory(struct vmci_queue *produceQ, // IN/OUT
+ struct vmci_queue *consumeQ) // IN/OUT
+{
+ ASSERT(produceQ->kernelIf);
+ ASSERT(consumeQ->kernelIf);
+ ASSERT(!produceQ->qHeader && !consumeQ->qHeader);
+
+ VMCIReleasePages(produceQ->kernelIf->headerPage,
+ produceQ->kernelIf->numPages, true);
+ memset(produceQ->kernelIf->headerPage, 0,
+ sizeof *produceQ->kernelIf->headerPage *
+ produceQ->kernelIf->numPages);
+ VMCIReleasePages(consumeQ->kernelIf->headerPage,
+ consumeQ->kernelIf->numPages, true);
+ memset(consumeQ->kernelIf->headerPage, 0,
+ sizeof *consumeQ->kernelIf->headerPage *
+ consumeQ->kernelIf->numPages);
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIHost_MapQueueHeaders --
+ *
+ * Once VMCIHost_RegisterUserMemory has been performed on a
+ * queue, the queue pair headers can be mapped into the
+ * kernel. Once mapped, they must be unmapped with
+ * VMCIHost_UnmapQueueHeaders prior to calling
+ * VMCIHost_UnregisterUserMemory.
+ *
+ * Results:
+ * VMCI_SUCCESS if pages are mapped, appropriate error code otherwise.
+ *
+ * Side Effects:
+ * Pages are pinned.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+int VMCIHost_MapQueueHeaders(struct vmci_queue *produceQ, // IN/OUT
+ struct vmci_queue *consumeQ) // IN/OUT
+{
+ int result;
+
+ if (!produceQ->qHeader || !consumeQ->qHeader) {
+ struct page *headers[2];
+
+ if (produceQ->qHeader != consumeQ->qHeader)
+ return VMCI_ERROR_QUEUEPAIR_MISMATCH;
+
+ if (produceQ->kernelIf->headerPage == NULL ||
+ *produceQ->kernelIf->headerPage == NULL)
+ return VMCI_ERROR_UNAVAILABLE;
+
+ ASSERT(*produceQ->kernelIf->headerPage
+ && *consumeQ->kernelIf->headerPage);
+
+ headers[0] = *produceQ->kernelIf->headerPage;
+ headers[1] = *consumeQ->kernelIf->headerPage;
+
+ produceQ->qHeader = vmap(headers, 2, VM_MAP, PAGE_KERNEL);
+ if (produceQ->qHeader != NULL) {
+ consumeQ->qHeader =
+ (struct vmci_queue_header *)((uint8_t *)
+ produceQ->qHeader +
+ PAGE_SIZE);
+ result = VMCI_SUCCESS;
+ } else {
+ Log("vmap failed\n");
+ result = VMCI_ERROR_NO_MEM;
+ }
+ } else {
+ result = VMCI_SUCCESS;
+ }
+
+ return result;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIHost_UnmapQueueHeaders --
+ *
+ * Unmaps previously mapped queue pair headers from the kernel.
+ *
+ * Results:
+ * VMCI_SUCCESS always.
+ *
+ * Side Effects:
+ * Pages are unpinned.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+int VMCIHost_UnmapQueueHeaders(uint32_t gid, // IN
+ struct vmci_queue *produceQ, // IN/OUT
+ struct vmci_queue *consumeQ) // IN/OUT
+{
+ if (produceQ->qHeader) {
+ ASSERT(consumeQ->qHeader);
+
+ if (produceQ->qHeader < consumeQ->qHeader) {
+ vunmap(produceQ->qHeader);
+ } else {
+ vunmap(consumeQ->qHeader);
+ }
+ produceQ->qHeader = NULL;
+ consumeQ->qHeader = NULL;
+ }
+
+ return VMCI_SUCCESS;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIHost_GetUserMemory --
+ *
+ *
+ * Lock the user pages referenced by the {produce,consume}Buffer
+ * struct into memory and populate the {produce,consume}Pages
+ * arrays in the attach structure with them.
+ *
+ * Results:
+ * VMCI_SUCCESS on sucess, negative error code on failure.
+ *
+ * Side Effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+int VMCIHost_GetUserMemory(uint64_t produceUVA, // IN
+ uint64_t consumeUVA, // IN
+ struct vmci_queue *produceQ, // OUT
+ struct vmci_queue *consumeQ) // OUT
+{
+ int retval;
+ int err = VMCI_SUCCESS;
+
+ down_write(¤t->mm->mmap_sem);
+ retval = get_user_pages(current,
+ current->mm,
+ (uintptr_t) produceUVA,
+ produceQ->kernelIf->numPages,
+ 1, 0, produceQ->kernelIf->headerPage, NULL);
+ if (retval < produceQ->kernelIf->numPages) {
+ Log("get_user_pages(produce) failed (retval=%d)\n", retval);
+ VMCIReleasePages(produceQ->kernelIf->headerPage, retval, false);
+ err = VMCI_ERROR_NO_MEM;
+ goto out;
+ }
+
+ retval = get_user_pages(current,
+ current->mm,
+ (uintptr_t) consumeUVA,
+ consumeQ->kernelIf->numPages,
+ 1, 0, consumeQ->kernelIf->headerPage, NULL);
+ if (retval < consumeQ->kernelIf->numPages) {
+ Log("get_user_pages(consume) failed (retval=%d)\n", retval);
+ VMCIReleasePages(consumeQ->kernelIf->headerPage, retval, false);
+ VMCIReleasePages(produceQ->kernelIf->headerPage,
+ produceQ->kernelIf->numPages, false);
+ err = VMCI_ERROR_NO_MEM;
+ }
+
+ out:
+ up_write(¤t->mm->mmap_sem);
+
+ return err;
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIHost_ReleaseUserMemory --
+ * Release the reference to user pages stored in the attach
+ * struct
+ *
+ * Results:
+ * None
+ *
+ * Side Effects:
+ * Pages are released from the page cache and may become
+ * swappable again.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+void VMCIHost_ReleaseUserMemory(struct vmci_queue *produceQ, // IN/OUT
+ struct vmci_queue *consumeQ) // IN/OUT
+{
+ ASSERT(produceQ->kernelIf->headerPage);
+
+ VMCIHost_UnregisterUserMemory(produceQ, consumeQ);
+}
--
1.7.0.4
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