From 8bf503991f87e32ea42a7bd69b79ba084fddc5d7 Mon Sep 17 00:00:00 2001 From: George Zhang Date: Tue, 8 Jan 2013 15:55:45 -0800 Subject: [PATCH] VMCI: host side driver implementation. VMCI host side driver code implementation. Signed-off-by: George Zhang Acked-by: Andy king Acked-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- drivers/misc/vmw_vmci/vmci_host.c | 1042 +++++++++++++++++++++++++++++ 1 file changed, 1042 insertions(+) create mode 100644 drivers/misc/vmw_vmci/vmci_host.c diff --git a/drivers/misc/vmw_vmci/vmci_host.c b/drivers/misc/vmw_vmci/vmci_host.c new file mode 100644 index 000000000000..16e7f547555f --- /dev/null +++ b/drivers/misc/vmw_vmci/vmci_host.c @@ -0,0 +1,1042 @@ +/* + * 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. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "vmci_handle_array.h" +#include "vmci_queue_pair.h" +#include "vmci_datagram.h" +#include "vmci_doorbell.h" +#include "vmci_resource.h" +#include "vmci_context.h" +#include "vmci_driver.h" +#include "vmci_event.h" + +#define VMCI_UTIL_NUM_RESOURCES 1 + +enum { + VMCI_NOTIFY_RESOURCE_QUEUE_PAIR = 0, + VMCI_NOTIFY_RESOURCE_DOOR_BELL = 1, +}; + +enum { + VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY = 0, + VMCI_NOTIFY_RESOURCE_ACTION_CREATE = 1, + VMCI_NOTIFY_RESOURCE_ACTION_DESTROY = 2, +}; + +/* + * VMCI driver initialization. This block can also be used to + * pass initial group membership etc. + */ +struct vmci_init_blk { + u32 cid; + u32 flags; +}; + +/* VMCIqueue_pairAllocInfo_VMToVM */ +struct vmci_qp_alloc_info_vmvm { + struct vmci_handle handle; + u32 peer; + u32 flags; + u64 produce_size; + u64 consume_size; + u64 produce_page_file; /* User VA. */ + u64 consume_page_file; /* User VA. */ + u64 produce_page_file_size; /* Size of the file name array. */ + u64 consume_page_file_size; /* Size of the file name array. */ + s32 result; + u32 _pad; +}; + +/* VMCISetNotifyInfo: Used to pass notify flag's address to the host driver. */ +struct vmci_set_notify_info { + u64 notify_uva; + s32 result; + u32 _pad; +}; + +/* + * Per-instance host state + */ +struct vmci_host_dev { + struct vmci_ctx *context; + int user_version; + enum vmci_obj_type ct_type; + struct mutex lock; /* Mutex lock for vmci context access */ +}; + +static struct vmci_ctx *host_context; +static bool vmci_host_device_initialized; +static atomic_t vmci_host_active_users = ATOMIC_INIT(0); + +/* + * 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. + */ +bool vmci_host_code_active(void) +{ + return vmci_host_device_initialized && + (!vmci_guest_code_active() || + atomic_read(&vmci_host_active_users) > 0); +} + +/* + * Called on open of /dev/vmci. + */ +static int vmci_host_open(struct inode *inode, struct file *filp) +{ + struct vmci_host_dev *vmci_host_dev; + + vmci_host_dev = kzalloc(sizeof(struct vmci_host_dev), GFP_KERNEL); + if (vmci_host_dev == NULL) + return -ENOMEM; + + vmci_host_dev->ct_type = VMCIOBJ_NOT_SET; + mutex_init(&vmci_host_dev->lock); + filp->private_data = vmci_host_dev; + + return 0; +} + +/* + * Called on close of /dev/vmci, most often when the process + * exits. + */ +static int vmci_host_close(struct inode *inode, struct file *filp) +{ + struct vmci_host_dev *vmci_host_dev = filp->private_data; + + if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) { + vmci_ctx_destroy(vmci_host_dev->context); + vmci_host_dev->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(&vmci_host_active_users); + } + vmci_host_dev->ct_type = VMCIOBJ_NOT_SET; + + kfree(vmci_host_dev); + filp->private_data = NULL; + return 0; +} + +/* + * 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 vmci_host_poll(struct file *filp, poll_table *wait) +{ + struct vmci_host_dev *vmci_host_dev = filp->private_data; + struct vmci_ctx *context = vmci_host_dev->context; + unsigned int mask = 0; + + if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) { + /* Check for VMCI calls to this VM context. */ + if (wait) + poll_wait(filp, &context->host_context.wait_queue, + wait); + + spin_lock(&context->lock); + if (context->pending_datagrams > 0 || + vmci_handle_arr_get_size( + context->pending_doorbell_array) > 0) { + mask = POLLIN; + } + spin_unlock(&context->lock); + } + return mask; +} + +/* + * 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 drv_cp_harray_to_user(void __user *user_buf_uva, + u64 *user_buf_size, + struct vmci_handle_arr *handle_array, + int *retval) +{ + u32 array_size = 0; + struct vmci_handle *handles; + + if (handle_array) + array_size = vmci_handle_arr_get_size(handle_array); + + if (array_size * sizeof(*handles) > *user_buf_size) + return VMCI_ERROR_MORE_DATA; + + *user_buf_size = array_size * sizeof(*handles); + if (*user_buf_size) + *retval = copy_to_user(user_buf_uva, + vmci_handle_arr_get_handles + (handle_array), *user_buf_size); + + return VMCI_SUCCESS; +} + +/* + * Sets up a given context for notify to work. Calls drv_map_bool_ptr() + * which maps the notify boolean in user VA in kernel space. + */ +static int vmci_host_setup_notify(struct vmci_ctx *context, + unsigned long uva) +{ + struct page *page; + int retval; + + if (context->notify_page) { + pr_devel("%s: Notify mechanism is already set up\n", __func__); + return VMCI_ERROR_DUPLICATE_ENTRY; + } + + /* + * We are using 'bool' internally, but let's make sure we explicit + * about the size. + */ + BUILD_BUG_ON(sizeof(bool) != sizeof(u8)); + if (!access_ok(VERIFY_WRITE, (void __user *)uva, sizeof(u8))) + return VMCI_ERROR_GENERIC; + + /* + * Lock physical page backing a given user VA. + */ + down_read(¤t->mm->mmap_sem); + retval = get_user_pages(current, current->mm, + PAGE_ALIGN(uva), + 1, 1, 0, &page, NULL); + up_read(¤t->mm->mmap_sem); + if (retval != 1) + return VMCI_ERROR_GENERIC; + + /* + * Map the locked page and set up notify pointer. + */ + context->notify = kmap(page) + (uva & (PAGE_SIZE - 1)); + vmci_ctx_check_signal_notify(context); + + return VMCI_SUCCESS; +} + +static int vmci_host_get_version(struct vmci_host_dev *vmci_host_dev, + unsigned int cmd, void __user *uptr) +{ + if (cmd == IOCTL_VMCI_VERSION2) { + int __user *vptr = uptr; + if (get_user(vmci_host_dev->user_version, vptr)) + return -EFAULT; + } + + /* + * 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 (vmci_host_dev->user_version > 0 && + vmci_host_dev->user_version < VMCI_VERSION_HOSTQP) { + return vmci_host_dev->user_version; + } + + return VMCI_VERSION; +} + +#define vmci_ioctl_err(fmt, ...) \ + pr_devel("%s: " fmt, ioctl_name, ##__VA_ARGS__) + +static int vmci_host_do_init_context(struct vmci_host_dev *vmci_host_dev, + const char *ioctl_name, + void __user *uptr) +{ + struct vmci_init_blk init_block; + const struct cred *cred; + int retval; + + if (copy_from_user(&init_block, uptr, sizeof(init_block))) { + vmci_ioctl_err("error reading init block\n"); + return -EFAULT; + } + + mutex_lock(&vmci_host_dev->lock); + + if (vmci_host_dev->ct_type != VMCIOBJ_NOT_SET) { + vmci_ioctl_err("received VMCI init on initialized handle\n"); + retval = -EINVAL; + goto out; + } + + if (init_block.flags & ~VMCI_PRIVILEGE_FLAG_RESTRICTED) { + vmci_ioctl_err("unsupported VMCI restriction flag\n"); + retval = -EINVAL; + goto out; + } + + cred = get_current_cred(); + vmci_host_dev->context = vmci_ctx_create(init_block.cid, + init_block.flags, 0, + vmci_host_dev->user_version, + cred); + put_cred(cred); + if (IS_ERR(vmci_host_dev->context)) { + retval = PTR_ERR(vmci_host_dev->context); + vmci_ioctl_err("error initializing context\n"); + goto out; + } + + /* + * Copy cid to userlevel, we do this to allow the VMX + * to enforce its policy on cid generation. + */ + init_block.cid = vmci_ctx_get_id(vmci_host_dev->context); + if (copy_to_user(uptr, &init_block, sizeof(init_block))) { + vmci_ctx_destroy(vmci_host_dev->context); + vmci_host_dev->context = NULL; + vmci_ioctl_err("error writing init block\n"); + retval = -EFAULT; + goto out; + } + + vmci_host_dev->ct_type = VMCIOBJ_CONTEXT; + atomic_inc(&vmci_host_active_users); + + retval = 0; + +out: + mutex_unlock(&vmci_host_dev->lock); + return retval; +} + +static int vmci_host_do_send_datagram(struct vmci_host_dev *vmci_host_dev, + const char *ioctl_name, + void __user *uptr) +{ + struct vmci_datagram_snd_rcv_info send_info; + struct vmci_datagram *dg = NULL; + u32 cid; + + if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { + vmci_ioctl_err("only valid for contexts\n"); + return -EINVAL; + } + + if (copy_from_user(&send_info, uptr, sizeof(send_info))) + return -EFAULT; + + if (send_info.len > VMCI_MAX_DG_SIZE) { + vmci_ioctl_err("datagram is too big (size=%d)\n", + send_info.len); + return -EINVAL; + } + + if (send_info.len < sizeof(*dg)) { + vmci_ioctl_err("datagram is too small (size=%d)\n", + send_info.len); + return -EINVAL; + } + + dg = kmalloc(send_info.len, GFP_KERNEL); + if (!dg) { + vmci_ioctl_err( + "cannot allocate memory to dispatch datagram\n"); + return -ENOMEM; + } + + if (copy_from_user(dg, (void __user *)(uintptr_t)send_info.addr, + send_info.len)) { + vmci_ioctl_err("error getting datagram\n"); + kfree(dg); + return -EFAULT; + } + + pr_devel("Datagram dst (handle=0x%x:0x%x) src (handle=0x%x:0x%x), payload (size=%llu bytes)\n", + dg->dst.context, dg->dst.resource, + dg->src.context, dg->src.resource, + (unsigned long long)dg->payload_size); + + /* Get source context id. */ + cid = vmci_ctx_get_id(vmci_host_dev->context); + send_info.result = vmci_datagram_dispatch(cid, dg, true); + kfree(dg); + + return copy_to_user(uptr, &send_info, sizeof(send_info)) ? -EFAULT : 0; +} + +static int vmci_host_do_receive_datagram(struct vmci_host_dev *vmci_host_dev, + const char *ioctl_name, + void __user *uptr) +{ + struct vmci_datagram_snd_rcv_info recv_info; + struct vmci_datagram *dg = NULL; + int retval; + size_t size; + + if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { + vmci_ioctl_err("only valid for contexts\n"); + return -EINVAL; + } + + if (copy_from_user(&recv_info, uptr, sizeof(recv_info))) + return -EFAULT; + + size = recv_info.len; + recv_info.result = vmci_ctx_dequeue_datagram(vmci_host_dev->context, + &size, &dg); + + if (recv_info.result >= VMCI_SUCCESS) { + void __user *ubuf = (void __user *)(uintptr_t)recv_info.addr; + retval = copy_to_user(ubuf, dg, VMCI_DG_SIZE(dg)); + kfree(dg); + if (retval != 0) + return -EFAULT; + } + + return copy_to_user(uptr, &recv_info, sizeof(recv_info)) ? -EFAULT : 0; +} + +static int vmci_host_do_alloc_queuepair(struct vmci_host_dev *vmci_host_dev, + const char *ioctl_name, + void __user *uptr) +{ + struct vmci_handle handle; + int vmci_status; + int __user *retptr; + u32 cid; + + if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { + vmci_ioctl_err("only valid for contexts\n"); + return -EINVAL; + } + + cid = vmci_ctx_get_id(vmci_host_dev->context); + + if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) { + struct vmci_qp_alloc_info_vmvm alloc_info; + struct vmci_qp_alloc_info_vmvm __user *info = uptr; + + if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info))) + return -EFAULT; + + handle = alloc_info.handle; + retptr = &info->result; + + vmci_status = vmci_qp_broker_alloc(alloc_info.handle, + alloc_info.peer, + alloc_info.flags, + VMCI_NO_PRIVILEGE_FLAGS, + alloc_info.produce_size, + alloc_info.consume_size, + NULL, + vmci_host_dev->context); + + if (vmci_status == VMCI_SUCCESS) + vmci_status = VMCI_SUCCESS_QUEUEPAIR_CREATE; + } else { + struct vmci_qp_alloc_info alloc_info; + struct vmci_qp_alloc_info __user *info = uptr; + struct vmci_qp_page_store page_store; + + if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info))) + return -EFAULT; + + handle = alloc_info.handle; + retptr = &info->result; + + page_store.pages = alloc_info.ppn_va; + page_store.len = alloc_info.num_ppns; + + vmci_status = vmci_qp_broker_alloc(alloc_info.handle, + alloc_info.peer, + alloc_info.flags, + VMCI_NO_PRIVILEGE_FLAGS, + alloc_info.produce_size, + alloc_info.consume_size, + &page_store, + vmci_host_dev->context); + } + + if (put_user(vmci_status, retptr)) { + if (vmci_status >= VMCI_SUCCESS) { + vmci_status = vmci_qp_broker_detach(handle, + vmci_host_dev->context); + } + return -EFAULT; + } + + return 0; +} + +static int vmci_host_do_queuepair_setva(struct vmci_host_dev *vmci_host_dev, + const char *ioctl_name, + void __user *uptr) +{ + struct vmci_qp_set_va_info set_va_info; + struct vmci_qp_set_va_info __user *info = uptr; + s32 result; + + if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { + vmci_ioctl_err("only valid for contexts\n"); + return -EINVAL; + } + + if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) { + vmci_ioctl_err("is not allowed\n"); + return -EINVAL; + } + + if (copy_from_user(&set_va_info, uptr, sizeof(set_va_info))) + return -EFAULT; + + if (set_va_info.va) { + /* + * VMX is passing down a new VA for the queue + * pair mapping. + */ + result = vmci_qp_broker_map(set_va_info.handle, + vmci_host_dev->context, + set_va_info.va); + } else { + /* + * The queue pair is about to be unmapped by + * the VMX. + */ + result = vmci_qp_broker_unmap(set_va_info.handle, + vmci_host_dev->context, 0); + } + + return put_user(result, &info->result) ? -EFAULT : 0; +} + +static int vmci_host_do_queuepair_setpf(struct vmci_host_dev *vmci_host_dev, + const char *ioctl_name, + void __user *uptr) +{ + struct vmci_qp_page_file_info page_file_info; + struct vmci_qp_page_file_info __user *info = uptr; + s32 result; + + if (vmci_host_dev->user_version < VMCI_VERSION_HOSTQP || + vmci_host_dev->user_version >= VMCI_VERSION_NOVMVM) { + vmci_ioctl_err("not supported on this VMX (version=%d)\n", + vmci_host_dev->user_version); + return -EINVAL; + } + + if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { + vmci_ioctl_err("only valid for contexts\n"); + return -EINVAL; + } + + if (copy_from_user(&page_file_info, uptr, sizeof(*info))) + return -EFAULT; + + /* + * 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 queue_pair 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 queue_pair. That means an additional test in the + * VMCI_Enqueue() code path. Ugh. + */ + + if (put_user(VMCI_SUCCESS, &info->result)) { + /* + * In this case, we can't write a result field of the + * caller's info block. So, we don't even try to + * SetPageStore(). + */ + return -EFAULT; + } + + result = vmci_qp_broker_set_page_store(page_file_info.handle, + page_file_info.produce_va, + page_file_info.consume_va, + vmci_host_dev->context); + if (result < VMCI_SUCCESS) { + if (put_user(result, &info->result)) { + /* + * 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. + */ + return -EFAULT; + } + } + + return 0; +} + +static int vmci_host_do_qp_detach(struct vmci_host_dev *vmci_host_dev, + const char *ioctl_name, + void __user *uptr) +{ + struct vmci_qp_dtch_info detach_info; + struct vmci_qp_dtch_info __user *info = uptr; + s32 result; + + if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { + vmci_ioctl_err("only valid for contexts\n"); + return -EINVAL; + } + + if (copy_from_user(&detach_info, uptr, sizeof(detach_info))) + return -EFAULT; + + result = vmci_qp_broker_detach(detach_info.handle, + vmci_host_dev->context); + if (result == VMCI_SUCCESS && + vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) { + result = VMCI_SUCCESS_LAST_DETACH; + } + + return put_user(result, &info->result) ? -EFAULT : 0; +} + +static int vmci_host_do_ctx_add_notify(struct vmci_host_dev *vmci_host_dev, + const char *ioctl_name, + void __user *uptr) +{ + struct vmci_ctx_info ar_info; + struct vmci_ctx_info __user *info = uptr; + s32 result; + u32 cid; + + if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { + vmci_ioctl_err("only valid for contexts\n"); + return -EINVAL; + } + + if (copy_from_user(&ar_info, uptr, sizeof(ar_info))) + return -EFAULT; + + cid = vmci_ctx_get_id(vmci_host_dev->context); + result = vmci_ctx_add_notification(cid, ar_info.remote_cid); + + return put_user(result, &info->result) ? -EFAULT : 0; +} + +static int vmci_host_do_ctx_remove_notify(struct vmci_host_dev *vmci_host_dev, + const char *ioctl_name, + void __user *uptr) +{ + struct vmci_ctx_info ar_info; + struct vmci_ctx_info __user *info = uptr; + u32 cid; + int result; + + if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { + vmci_ioctl_err("only valid for contexts\n"); + return -EINVAL; + } + + if (copy_from_user(&ar_info, uptr, sizeof(ar_info))) + return -EFAULT; + + cid = vmci_ctx_get_id(vmci_host_dev->context); + result = vmci_ctx_remove_notification(cid, + ar_info.remote_cid); + + return put_user(result, &info->result) ? -EFAULT : 0; +} + +static int vmci_host_do_ctx_get_cpt_state(struct vmci_host_dev *vmci_host_dev, + const char *ioctl_name, + void __user *uptr) +{ + struct vmci_ctx_chkpt_buf_info get_info; + u32 cid; + void *cpt_buf; + int retval; + + if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { + vmci_ioctl_err("only valid for contexts\n"); + return -EINVAL; + } + + if (copy_from_user(&get_info, uptr, sizeof(get_info))) + return -EFAULT; + + cid = vmci_ctx_get_id(vmci_host_dev->context); + get_info.result = vmci_ctx_get_chkpt_state(cid, get_info.cpt_type, + &get_info.buf_size, &cpt_buf); + if (get_info.result == VMCI_SUCCESS && get_info.buf_size) { + void __user *ubuf = (void __user *)(uintptr_t)get_info.cpt_buf; + retval = copy_to_user(ubuf, cpt_buf, get_info.buf_size); + kfree(cpt_buf); + + if (retval) + return -EFAULT; + } + + return copy_to_user(uptr, &get_info, sizeof(get_info)) ? -EFAULT : 0; +} + +static int vmci_host_do_ctx_set_cpt_state(struct vmci_host_dev *vmci_host_dev, + const char *ioctl_name, + void __user *uptr) +{ + struct vmci_ctx_chkpt_buf_info set_info; + u32 cid; + void *cpt_buf; + int retval; + + if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { + vmci_ioctl_err("only valid for contexts\n"); + return -EINVAL; + } + + if (copy_from_user(&set_info, uptr, sizeof(set_info))) + return -EFAULT; + + cpt_buf = kmalloc(set_info.buf_size, GFP_KERNEL); + if (!cpt_buf) { + vmci_ioctl_err( + "cannot allocate memory to set cpt state (type=%d)\n", + set_info.cpt_type); + return -ENOMEM; + } + + if (copy_from_user(cpt_buf, (void __user *)(uintptr_t)set_info.cpt_buf, + set_info.buf_size)) { + retval = -EFAULT; + goto out; + } + + cid = vmci_ctx_get_id(vmci_host_dev->context); + set_info.result = vmci_ctx_set_chkpt_state(cid, set_info.cpt_type, + set_info.buf_size, cpt_buf); + + retval = copy_to_user(uptr, &set_info, sizeof(set_info)) ? -EFAULT : 0; + +out: + kfree(cpt_buf); + return retval; +} + +static int vmci_host_do_get_context_id(struct vmci_host_dev *vmci_host_dev, + const char *ioctl_name, + void __user *uptr) +{ + u32 __user *u32ptr = uptr; + + return put_user(VMCI_HOST_CONTEXT_ID, u32ptr) ? -EFAULT : 0; +} + +static int vmci_host_do_set_notify(struct vmci_host_dev *vmci_host_dev, + const char *ioctl_name, + void __user *uptr) +{ + struct vmci_set_notify_info notify_info; + + if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { + vmci_ioctl_err("only valid for contexts\n"); + return -EINVAL; + } + + if (copy_from_user(¬ify_info, uptr, sizeof(notify_info))) + return -EFAULT; + + if (notify_info.notify_uva) { + notify_info.result = + vmci_host_setup_notify(vmci_host_dev->context, + notify_info.notify_uva); + } else { + vmci_ctx_unset_notify(vmci_host_dev->context); + notify_info.result = VMCI_SUCCESS; + } + + return copy_to_user(uptr, ¬ify_info, sizeof(notify_info)) ? + -EFAULT : 0; +} + +static int vmci_host_do_notify_resource(struct vmci_host_dev *vmci_host_dev, + const char *ioctl_name, + void __user *uptr) +{ + struct vmci_dbell_notify_resource_info info; + u32 cid; + + if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) { + vmci_ioctl_err("invalid for current VMX versions\n"); + return -EINVAL; + } + + if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { + vmci_ioctl_err("only valid for contexts\n"); + return -EINVAL; + } + + if (copy_from_user(&info, uptr, sizeof(info))) + return -EFAULT; + + cid = vmci_ctx_get_id(vmci_host_dev->context); + + switch (info.action) { + case VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY: + if (info.resource == VMCI_NOTIFY_RESOURCE_DOOR_BELL) { + u32 flags = VMCI_NO_PRIVILEGE_FLAGS; + info.result = vmci_ctx_notify_dbell(cid, info.handle, + flags); + } else { + info.result = VMCI_ERROR_UNAVAILABLE; + } + break; + + case VMCI_NOTIFY_RESOURCE_ACTION_CREATE: + info.result = vmci_ctx_dbell_create(cid, info.handle); + break; + + case VMCI_NOTIFY_RESOURCE_ACTION_DESTROY: + info.result = vmci_ctx_dbell_destroy(cid, info.handle); + break; + + default: + vmci_ioctl_err("got unknown action (action=%d)\n", + info.action); + info.result = VMCI_ERROR_INVALID_ARGS; + } + + return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0; +} + +static int vmci_host_do_recv_notifications(struct vmci_host_dev *vmci_host_dev, + const char *ioctl_name, + void __user *uptr) +{ + struct vmci_ctx_notify_recv_info info; + struct vmci_handle_arr *db_handle_array; + struct vmci_handle_arr *qp_handle_array; + void __user *ubuf; + u32 cid; + int retval = 0; + + if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { + vmci_ioctl_err("only valid for contexts\n"); + return -EINVAL; + } + + if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) { + vmci_ioctl_err("not supported for the current vmx version\n"); + return -EINVAL; + } + + if (copy_from_user(&info, uptr, sizeof(info))) + return -EFAULT; + + if ((info.db_handle_buf_size && !info.db_handle_buf_uva) || + (info.qp_handle_buf_size && !info.qp_handle_buf_uva)) { + return -EINVAL; + } + + cid = vmci_ctx_get_id(vmci_host_dev->context); + + info.result = vmci_ctx_rcv_notifications_get(cid, + &db_handle_array, &qp_handle_array); + if (info.result != VMCI_SUCCESS) + return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0; + + ubuf = (void __user *)(uintptr_t)info.db_handle_buf_uva; + info.result = drv_cp_harray_to_user(ubuf, &info.db_handle_buf_size, + db_handle_array, &retval); + if (info.result == VMCI_SUCCESS && !retval) { + ubuf = (void __user *)(uintptr_t)info.qp_handle_buf_uva; + info.result = drv_cp_harray_to_user(ubuf, + &info.qp_handle_buf_size, + qp_handle_array, &retval); + } + + if (!retval && copy_to_user(uptr, &info, sizeof(info))) + retval = -EFAULT; + + vmci_ctx_rcv_notifications_release(cid, + db_handle_array, qp_handle_array, + info.result == VMCI_SUCCESS && !retval); + + return retval; +} + +static long vmci_host_unlocked_ioctl(struct file *filp, + unsigned int iocmd, unsigned long ioarg) +{ +#define VMCI_DO_IOCTL(ioctl_name, ioctl_fn) do { \ + char *name = __stringify(IOCTL_VMCI_ ## ioctl_name); \ + return vmci_host_do_ ## ioctl_fn( \ + vmci_host_dev, name, uptr); \ + } while (0) + + struct vmci_host_dev *vmci_host_dev = filp->private_data; + void __user *uptr = (void __user *)ioarg; + + switch (iocmd) { + case IOCTL_VMCI_INIT_CONTEXT: + VMCI_DO_IOCTL(INIT_CONTEXT, init_context); + case IOCTL_VMCI_DATAGRAM_SEND: + VMCI_DO_IOCTL(DATAGRAM_SEND, send_datagram); + case IOCTL_VMCI_DATAGRAM_RECEIVE: + VMCI_DO_IOCTL(DATAGRAM_RECEIVE, receive_datagram); + case IOCTL_VMCI_QUEUEPAIR_ALLOC: + VMCI_DO_IOCTL(QUEUEPAIR_ALLOC, alloc_queuepair); + case IOCTL_VMCI_QUEUEPAIR_SETVA: + VMCI_DO_IOCTL(QUEUEPAIR_SETVA, queuepair_setva); + case IOCTL_VMCI_QUEUEPAIR_SETPAGEFILE: + VMCI_DO_IOCTL(QUEUEPAIR_SETPAGEFILE, queuepair_setpf); + case IOCTL_VMCI_QUEUEPAIR_DETACH: + VMCI_DO_IOCTL(QUEUEPAIR_DETACH, qp_detach); + case IOCTL_VMCI_CTX_ADD_NOTIFICATION: + VMCI_DO_IOCTL(CTX_ADD_NOTIFICATION, ctx_add_notify); + case IOCTL_VMCI_CTX_REMOVE_NOTIFICATION: + VMCI_DO_IOCTL(CTX_REMOVE_NOTIFICATION, ctx_remove_notify); + case IOCTL_VMCI_CTX_GET_CPT_STATE: + VMCI_DO_IOCTL(CTX_GET_CPT_STATE, ctx_get_cpt_state); + case IOCTL_VMCI_CTX_SET_CPT_STATE: + VMCI_DO_IOCTL(CTX_SET_CPT_STATE, ctx_set_cpt_state); + case IOCTL_VMCI_GET_CONTEXT_ID: + VMCI_DO_IOCTL(GET_CONTEXT_ID, get_context_id); + case IOCTL_VMCI_SET_NOTIFY: + VMCI_DO_IOCTL(SET_NOTIFY, set_notify); + case IOCTL_VMCI_NOTIFY_RESOURCE: + VMCI_DO_IOCTL(NOTIFY_RESOURCE, notify_resource); + case IOCTL_VMCI_NOTIFICATIONS_RECEIVE: + VMCI_DO_IOCTL(NOTIFICATIONS_RECEIVE, recv_notifications); + + case IOCTL_VMCI_VERSION: + case IOCTL_VMCI_VERSION2: + return vmci_host_get_version(vmci_host_dev, iocmd, uptr); + + default: + pr_devel("%s: Unknown ioctl (iocmd=%d)\n", __func__, iocmd); + return -EINVAL; + } + +#undef VMCI_DO_IOCTL +} + +static const struct file_operations vmuser_fops = { + .owner = THIS_MODULE, + .open = vmci_host_open, + .release = vmci_host_close, + .poll = vmci_host_poll, + .unlocked_ioctl = vmci_host_unlocked_ioctl, + .compat_ioctl = vmci_host_unlocked_ioctl, +}; + +static struct miscdevice vmci_host_miscdev = { + .name = "vmci", + .minor = MISC_DYNAMIC_MINOR, + .fops = &vmuser_fops, +}; + +int __init vmci_host_init(void) +{ + int error; + + host_context = vmci_ctx_create(VMCI_HOST_CONTEXT_ID, + VMCI_DEFAULT_PROC_PRIVILEGE_FLAGS, + -1, VMCI_VERSION, NULL); + if (IS_ERR(host_context)) { + error = PTR_ERR(host_context); + pr_warn("Failed to initialize VMCIContext (error%d)\n", + error); + return error; + } + + error = misc_register(&vmci_host_miscdev); + if (error) { + pr_warn("Module registration error (name=%s, major=%d, minor=%d, err=%d)\n", + vmci_host_miscdev.name, + MISC_MAJOR, vmci_host_miscdev.minor, + error); + pr_warn("Unable to initialize host personality\n"); + vmci_ctx_destroy(host_context); + return error; + } + + pr_info("VMCI host device registered (name=%s, major=%d, minor=%d)\n", + vmci_host_miscdev.name, MISC_MAJOR, vmci_host_miscdev.minor); + + vmci_host_device_initialized = true; + return 0; +} + +void __exit vmci_host_exit(void) +{ + int error; + + vmci_host_device_initialized = false; + + error = misc_deregister(&vmci_host_miscdev); + if (error) + pr_warn("Error unregistering character device: %d\n", error); + + vmci_ctx_destroy(host_context); + vmci_qp_broker_exit(); + + pr_debug("VMCI host driver module unloaded\n"); +} -- 2.39.5