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/*
* Copyright (c) 2019 Nutanix Inc. All rights reserved.
*
* Authors: Thanos Makatos <thanos@nutanix.com>
* Swapnil Ingle <swapnil.ingle@nutanix.com>
* Felipe Franciosi <felipe@nutanix.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Nutanix nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
*/
#define _GNU_SOURCE
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <assert.h>
#include <errno.h>
#include <stddef.h>
#include <sys/mman.h>
#include <stdarg.h>
#include <linux/vfio.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include "cap.h"
#include "dma.h"
#include "libvfio-user.h"
#include "private.h"
#include "tran_sock.h"
#include "migration.h"
#include "irq.h"
void
vfu_log(vfu_ctx_t *vfu_ctx, vfu_log_lvl_t lvl, const char *fmt, ...)
{
va_list ap;
char buf[BUFSIZ];
int _errno = errno;
assert(vfu_ctx != NULL);
if (vfu_ctx->log == NULL || lvl > vfu_ctx->log_lvl || fmt == NULL) {
return;
}
va_start(ap, fmt);
vsnprintf(buf, sizeof buf, fmt, ap);
va_end(ap);
vfu_ctx->log(vfu_ctx->pvt, lvl, buf);
errno = _errno;
}
static inline int
ERROR(int err)
{
errno = err;
return -1;
}
static size_t
get_vfio_caps_size(bool is_migr_reg, struct vfu_sparse_mmap_areas *m)
{
size_t type_size = 0;
size_t sparse_size = 0;
if (is_migr_reg) {
type_size = sizeof(struct vfio_region_info_cap_type);
}
if (m != NULL) {
sparse_size = sizeof(struct vfio_region_info_cap_sparse_mmap)
+ (m->nr_mmap_areas * sizeof(struct vfio_region_sparse_mmap_area));
}
return type_size + sparse_size;
}
/*
* Populate the sparse mmap capability information to vfio-client.
* Sparse mmap information stays after struct vfio_region_info and cap_offest
* points accordingly.
*/
static void
dev_get_caps(vfu_ctx_t *vfu_ctx, vfu_reg_info_t *vfu_reg, bool is_migr_reg,
struct vfio_region_info *vfio_reg)
{
struct vfio_info_cap_header *header;
struct vfio_region_info_cap_type *type = NULL;
struct vfio_region_info_cap_sparse_mmap *sparse = NULL;
struct vfu_sparse_mmap_areas *mmap_areas;
assert(vfu_ctx != NULL);
assert(vfio_reg != NULL);
header = (struct vfio_info_cap_header*)(vfio_reg + 1);
if (is_migr_reg) {
type = (struct vfio_region_info_cap_type*)header;
type->header.id = VFIO_REGION_INFO_CAP_TYPE;
type->header.version = 1;
type->header.next = 0;
type->type = VFIO_REGION_TYPE_MIGRATION;
type->subtype = VFIO_REGION_SUBTYPE_MIGRATION;
vfio_reg->cap_offset = sizeof(struct vfio_region_info);
}
if (vfu_reg->mmap_areas != NULL) {
int i, nr_mmap_areas = vfu_reg->mmap_areas->nr_mmap_areas;
if (type != NULL) {
type->header.next = vfio_reg->cap_offset + sizeof(struct vfio_region_info_cap_type);
sparse = (struct vfio_region_info_cap_sparse_mmap*)(type + 1);
} else {
vfio_reg->cap_offset = sizeof(struct vfio_region_info);
sparse = (struct vfio_region_info_cap_sparse_mmap*)header;
}
sparse->header.id = VFIO_REGION_INFO_CAP_SPARSE_MMAP;
sparse->header.version = 1;
sparse->header.next = 0;
sparse->nr_areas = nr_mmap_areas;
mmap_areas = vfu_reg->mmap_areas;
for (i = 0; i < nr_mmap_areas; i++) {
sparse->areas[i].offset = mmap_areas->areas[i].start;
sparse->areas[i].size = mmap_areas->areas[i].size;
vfu_log(vfu_ctx, VFU_DBG, "%s: area %d %#llx-%#llx", __func__,
i, sparse->areas[i].offset,
sparse->areas[i].offset + sparse->areas[i].size);
}
}
/*
* FIXME VFIO_REGION_INFO_FLAG_MMAP is valid if the region is
* memory-mappable in general, not only if it supports sparse mmap.
*/
vfio_reg->flags |= VFIO_REGION_INFO_FLAG_MMAP | VFIO_REGION_INFO_FLAG_CAPS;
}
#define VFU_REGION_SHIFT 40
#define VFU_REGION_MASK ((1ULL << VFU_REGION_SHIFT) - 1)
uint64_t
region_to_offset(uint32_t region)
{
return (uint64_t)region << VFU_REGION_SHIFT;
}
uint32_t
offset_to_region(uint64_t offset)
{
return (offset >> VFU_REGION_SHIFT) & VFU_REGION_MASK;
}
#ifdef VFU_VERBOSE_LOGGING
void
dump_buffer(const char *prefix, const char *buf, uint32_t count)
{
int i;
const size_t bytes_per_line = 0x8;
if (strcmp(prefix, "")) {
fprintf(stderr, "%s\n", prefix);
}
for (i = 0; i < (int)count; i++) {
if (i % bytes_per_line != 0) {
fprintf(stderr, " ");
}
/* TODO valgrind emits a warning if count is 1 */
fprintf(stderr,"0x%02x", *(buf + i));
if ((i + 1) % bytes_per_line == 0) {
fprintf(stderr, "\n");
}
}
if (i % bytes_per_line != 0) {
fprintf(stderr, "\n");
}
}
#else
#define dump_buffer(prefix, buf, count)
#endif
static bool
is_migr_reg(vfu_ctx_t *vfu_ctx, int index)
{
return &vfu_ctx->reg_info[index] == vfu_ctx->migr_reg;
}
static long
dev_get_reginfo(vfu_ctx_t *vfu_ctx, uint32_t index,
struct vfio_region_info **vfio_reg)
{
vfu_reg_info_t *vfu_reg;
size_t caps_size;
uint32_t argsz;
assert(vfu_ctx != NULL);
assert(vfio_reg != NULL);
vfu_reg = &vfu_ctx->reg_info[index];
if (index >= vfu_ctx->nr_regions) {
vfu_log(vfu_ctx, VFU_DBG, "bad region index %d", index);
return -EINVAL;
}
caps_size = get_vfio_caps_size(is_migr_reg(vfu_ctx, index),
vfu_reg->mmap_areas);
argsz = caps_size + sizeof(struct vfio_region_info);
*vfio_reg = calloc(1, argsz);
if (!*vfio_reg) {
return -ENOMEM;
}
/* FIXME document in the protocol that vfio_req->argsz is ignored */
(*vfio_reg)->argsz = argsz;
(*vfio_reg)->flags = vfu_reg->flags;
(*vfio_reg)->index = index;
(*vfio_reg)->offset = region_to_offset((*vfio_reg)->index);
(*vfio_reg)->size = vfu_reg->size;
if (caps_size > 0) {
dev_get_caps(vfu_ctx, vfu_reg, is_migr_reg(vfu_ctx, index), *vfio_reg);
}
vfu_log(vfu_ctx, VFU_DBG, "region_info[%d] offset %#llx flags %#x size %llu "
"argsz %u",
(*vfio_reg)->index, (*vfio_reg)->offset, (*vfio_reg)->flags,
(*vfio_reg)->size, (*vfio_reg)->argsz);
return 0;
}
int
vfu_get_region(loff_t pos, size_t count, loff_t *off)
{
int r;
assert(off != NULL);
r = offset_to_region(pos);
if ((int)offset_to_region(pos + count) != r) {
return -ENOENT;
}
*off = pos - region_to_offset(r);
return r;
}
static uint32_t
region_size(vfu_ctx_t *vfu_ctx, int region)
{
assert(region >= VFU_PCI_DEV_BAR0_REGION_IDX && region <= VFU_PCI_DEV_VGA_REGION_IDX);
return vfu_ctx->reg_info[region].size;
}
static uint32_t
pci_config_space_size(vfu_ctx_t *vfu_ctx)
{
return region_size(vfu_ctx, VFU_PCI_DEV_CFG_REGION_IDX);
}
static ssize_t
handle_pci_config_space_access(vfu_ctx_t *vfu_ctx, char *buf, size_t count,
loff_t pos, bool is_write)
{
int ret;
count = MIN(pci_config_space_size(vfu_ctx), count);
if (is_write) {
ret = cap_maybe_access(vfu_ctx, vfu_ctx->caps, buf, count, pos);
if (ret < 0) {
vfu_log(vfu_ctx, VFU_ERR, "bad access to capabilities %#lx-%#lx\n",
pos, pos + count);
return ret;
}
} else {
memcpy(buf, vfu_ctx->pci_config_space->raw + pos, count);
}
return count;
}
static ssize_t
do_access(vfu_ctx_t *vfu_ctx, char *buf, uint8_t count, uint64_t pos, bool is_write)
{
int idx;
loff_t offset;
assert(vfu_ctx != NULL);
assert(buf != NULL);
assert(count == 1 || count == 2 || count == 4 || count == 8);
idx = vfu_get_region(pos, count, &offset);
if (idx < 0) {
vfu_log(vfu_ctx, VFU_ERR, "invalid region %d", idx);
return idx;
}
if (idx < 0 || idx >= (int)vfu_ctx->nr_regions) {
vfu_log(vfu_ctx, VFU_ERR, "bad region %d", idx);
return -EINVAL;
}
if (idx == VFU_PCI_DEV_CFG_REGION_IDX) {
return handle_pci_config_space_access(vfu_ctx, buf, count, offset,
is_write);
}
if (is_migr_reg(vfu_ctx, idx)) {
if (offset + count > vfu_ctx->reg_info[idx].size) {
vfu_log(vfu_ctx, VFU_ERR, "read %#lx-%#lx past end of migration region (%#x)",
offset, offset + count - 1,
vfu_ctx->reg_info[idx].size);
return -EINVAL;
}
return handle_migration_region_access(vfu_ctx, vfu_ctx->pvt,
vfu_ctx->migration,
buf, count, offset, is_write);
}
/*
* Checking whether a callback exists might sound expensive however this
* code is not performance critical. This works well when we don't expect a
* region to be used, so the user of the library can simply leave the
* callback NULL in vfu_create_ctx.
*/
if (vfu_ctx->reg_info[idx].fn != NULL) {
return vfu_ctx->reg_info[idx].fn(vfu_ctx->pvt, buf, count, offset,
is_write);
}
vfu_log(vfu_ctx, VFU_ERR, "no callback for region %d", idx);
return -EINVAL;
}
/*
* Returns the number of bytes processed on success or a negative number on
* error.
*
* TODO function naming, general cleanup of access path
* FIXME we must be able to return values up to uint32_t bit, or negative on
* error. Better to make return value an int and return the number of bytes
* processed via an argument.
*/
static ssize_t
_vfu_access(vfu_ctx_t *vfu_ctx, char *buf, uint32_t count, uint64_t *ppos,
bool is_write)
{
uint32_t done = 0;
int ret;
assert(vfu_ctx != NULL);
/* buf and ppos can be NULL if count is 0 */
while (count) {
size_t size;
/*
* Limit accesses to qword and enforce alignment. Figure out whether
* the PCI spec requires this
* FIXME while this makes sense for registers, we might be able to relax
* this requirement and make some transfers more efficient. Maybe make
* this a per-region option that can be set by the user?
*/
if (count >= 8 && !(*ppos % 8)) {
size = 8;
} else if (count >= 4 && !(*ppos % 4)) {
size = 4;
} else if (count >= 2 && !(*ppos % 2)) {
size = 2;
} else {
size = 1;
}
ret = do_access(vfu_ctx, buf, size, *ppos, is_write);
if (ret <= 0) {
vfu_log(vfu_ctx, VFU_ERR, "failed to %s %#lx-%#lx: %s",
is_write ? "write to" : "read from", *ppos, *ppos + size - 1,
strerror(-ret));
/*
* TODO if ret < 0 then it might contain a legitimate error code, why replace it with EFAULT?
*/
return -EFAULT;
}
if (ret != (int)size) {
vfu_log(vfu_ctx, VFU_DBG, "bad read %d != %ld", ret, size);
}
count -= size;
done += size;
*ppos += size;
buf += size;
}
return done;
}
static inline int
vfu_access(vfu_ctx_t *vfu_ctx, bool is_write, char *rwbuf, uint32_t count,
uint64_t *pos)
{
uint32_t processed = 0, _count;
int ret;
assert(vfu_ctx != NULL);
assert(rwbuf != NULL);
assert(pos != NULL);
vfu_log(vfu_ctx, VFU_DBG, "%s %#lx-%#lx", is_write ? "W" : "R", *pos,
*pos + count - 1);
#ifdef VFU_VERBOSE_LOGGING
if (is_write) {
dump_buffer("buffer write", rwbuf, count);
}
#endif
_count = count;
ret = vfu_pci_hdr_access(vfu_ctx, &_count, pos, is_write, rwbuf);
if (ret != 0) {
/* FIXME shouldn't we fail here? */
vfu_log(vfu_ctx, VFU_ERR, "failed to access PCI header: %s",
strerror(-ret));
#ifdef VFU_VERBOSE_LOGGING
dump_buffer("buffer write", rwbuf, _count);
#endif
}
/*
* count is how much has been processed by vfu_pci_hdr_access,
* _count is how much there's left to be processed by vfu_access
*/
processed = count - _count;
ret = _vfu_access(vfu_ctx, rwbuf + processed, _count, pos, is_write);
if (ret >= 0) {
ret += processed;
#ifdef VFU_VERBOSE_LOGGING
if (!is_write && err == ret) {
dump_buffer("buffer read", rwbuf, ret);
}
#endif
}
return ret;
}
/* TODO merge with dev_get_reginfo */
static int
handle_device_get_region_info(vfu_ctx_t *vfu_ctx, uint32_t size,
struct vfio_region_info *reg_info_in,
struct vfio_region_info **reg_info_out)
{
if (size != sizeof(*reg_info_in) || size != reg_info_in->argsz) {
return -EINVAL;
}
return dev_get_reginfo(vfu_ctx, reg_info_in->index, reg_info_out);
}
static int
handle_device_get_info(vfu_ctx_t *vfu_ctx, uint32_t size,
struct vfio_device_info *dev_info)
{
assert(vfu_ctx != NULL);
assert(dev_info != NULL);
if (size != sizeof *dev_info) {
return -EINVAL;
}
dev_info->argsz = sizeof *dev_info;
dev_info->flags = VFIO_DEVICE_FLAGS_PCI | VFIO_DEVICE_FLAGS_RESET;
dev_info->num_regions = vfu_ctx->nr_regions;
dev_info->num_irqs = VFU_DEV_NUM_IRQS;
vfu_log(vfu_ctx, VFU_DBG, "sent devinfo flags %#x, num_regions %d, num_irqs"
" %d", dev_info->flags, dev_info->num_regions, dev_info->num_irqs);
return 0;
}
int
consume_fd(int *fds, size_t nr_fds, size_t index)
{
int fd;
if (index >= nr_fds) {
return -EINVAL;
}
fd = fds[index];
fds[index] = -1;
return fd;
}
/*
* Handles a DMA map/unmap request.
*
* @vfu_ctx: LM context
* @size: size, in bytes, of the memory pointed to be @dma_regions
* @map: whether this is a DMA map operation
* @fds: array of file descriptors.
* @nr_fds: size of above array.
* @dma_regions: memory that contains the DMA regions to be mapped/unmapped
*
* @returns 0 on success, -errno on failure.
*/
int
handle_dma_map_or_unmap(vfu_ctx_t *vfu_ctx, uint32_t size, bool map,
int *fds, size_t nr_fds,
struct vfio_user_dma_region *dma_regions)
{
int nr_dma_regions;
int ret, i;
size_t fdi;
assert(vfu_ctx != NULL);
assert(fds != NULL);
if (vfu_ctx->dma == NULL) {
return 0;
}
if (size % sizeof(struct vfio_user_dma_region) != 0) {
vfu_log(vfu_ctx, VFU_ERR, "bad size of DMA regions %d", size);
return -EINVAL;
}
nr_dma_regions = (int)(size / sizeof(struct vfio_user_dma_region));
if (nr_dma_regions == 0) {
return 0;
}
for (i = 0, fdi = 0; i < nr_dma_regions; i++) {
if (map) {
int fd = -1;
if (dma_regions[i].flags == VFIO_USER_F_DMA_REGION_MAPPABLE) {
fd = consume_fd(fds, nr_fds, fdi++);
if (fd < 0) {
ret = fd;
break;
}
}
ret = dma_controller_add_region(vfu_ctx->dma,
dma_regions[i].addr,
dma_regions[i].size,
fd,
dma_regions[i].offset);
if (ret < 0) {
if (fd != -1) {
close(fd);
}
vfu_log(vfu_ctx, VFU_INF,
"failed to add DMA region %#lx-%#lx offset=%#lx fd=%d: %s",
dma_regions[i].addr,
dma_regions[i].addr + dma_regions[i].size - 1,
dma_regions[i].offset, fd,
strerror(-ret));
break;
}
vfu_log(vfu_ctx, VFU_DBG,
"added DMA region %#lx-%#lx offset=%#lx fd=%d",
dma_regions[i].addr,
dma_regions[i].addr + dma_regions[i].size - 1,
dma_regions[i].offset, fd);
} else {
ret = dma_controller_remove_region(vfu_ctx->dma,
dma_regions[i].addr,
dma_regions[i].size,
vfu_ctx->unmap_dma, vfu_ctx->pvt);
if (ret < 0) {
vfu_log(vfu_ctx, VFU_INF,
"failed to remove DMA region %#lx-%#lx: %s",
dma_regions[i].addr,
dma_regions[i].addr + dma_regions[i].size - 1,
strerror(-ret));
break;
}
vfu_log(vfu_ctx, VFU_DBG,
"removed DMA region %#lx-%#lx",
dma_regions[i].addr,
dma_regions[i].addr + dma_regions[i].size - 1);
}
if (ret < 0) {
return ret;
}
if (vfu_ctx->map_dma != NULL) {
vfu_ctx->map_dma(vfu_ctx->pvt, dma_regions[i].addr,
dma_regions[i].size);
}
}
return ret;
}
static int
handle_device_reset(vfu_ctx_t *vfu_ctx)
{
vfu_log(vfu_ctx, VFU_DBG, "Device reset called by client");
if (vfu_ctx->reset != NULL) {
return vfu_ctx->reset(vfu_ctx->pvt);
}
return 0;
}
static int
validate_region_access(vfu_ctx_t *vfu_ctx, uint32_t size, uint16_t cmd,
struct vfio_user_region_access *region_access)
{
assert(region_access != NULL);
if (size < sizeof *region_access) {
vfu_log(vfu_ctx, VFU_ERR, "message size too small (%d)", size);
return -EINVAL;
}
if (region_access->region > vfu_ctx->nr_regions || region_access->count <= 0) {
vfu_log(vfu_ctx, VFU_ERR, "bad region %d and/or count %d",
region_access->region, region_access->count);
return -EINVAL;
}
if (device_is_stopped_and_copying(vfu_ctx->migration) &&
!is_migr_reg(vfu_ctx, region_access->region)) {
vfu_log(vfu_ctx, VFU_ERR,
"cannot access region %d while device in stop-and-copy state",
region_access->region);
return -EINVAL;
}
if (cmd == VFIO_USER_REGION_WRITE &&
size - sizeof *region_access != region_access->count)
{
vfu_log(vfu_ctx, VFU_ERR, "bad region access, expected %lu, actual %d",
size - sizeof *region_access, region_access->count);
return -EINVAL;
}
return 0;
}
static int
handle_region_access(vfu_ctx_t *vfu_ctx, uint32_t size, uint16_t cmd,
void **data, size_t *len,
struct vfio_user_region_access *region_access)
{
uint64_t count, offset;
int ret;
char *buf;
assert(vfu_ctx != NULL);
assert(data != NULL);
assert(region_access != NULL);
ret = validate_region_access(vfu_ctx, size, cmd, region_access);
if (ret < 0) {
return ret;
}
*len = sizeof *region_access;
if (cmd == VFIO_USER_REGION_READ) {
*len += region_access->count;
}
*data = malloc(*len);
if (*data == NULL) {
return -ENOMEM;
}
if (cmd == VFIO_USER_REGION_READ) {
buf = (char*)(((struct vfio_user_region_access*)(*data)) + 1);
} else {
buf = (char*)(region_access + 1);
}
count = region_access->count;
offset = region_to_offset(region_access->region) + region_access->offset;
ret = vfu_access(vfu_ctx, cmd == VFIO_USER_REGION_WRITE, buf, count, &offset);
if (ret != (int)region_access->count) {
vfu_log(vfu_ctx, VFU_ERR, "failed to %s %#x-%#lx: %d",
cmd == VFIO_USER_REGION_WRITE ? "write" : "read",
region_access->count,
region_access->offset + region_access->count - 1, ret);
/* FIXME we should return whatever has been accessed, not an error */
if (ret >= 0) {
ret = -EINVAL;
}
return ret;
}
region_access = *data;
region_access->count = ret;
return 0;
}
static int
handle_dirty_pages_get(vfu_ctx_t *vfu_ctx,
struct iovec **iovecs, size_t *nr_iovecs,
struct vfio_iommu_type1_dirty_bitmap_get *ranges,
uint32_t size)
{
int ret = -EINVAL;
size_t i;
assert(vfu_ctx != NULL);
assert(iovecs != NULL);
assert(nr_iovecs != NULL);
assert(ranges != NULL);
if (size % sizeof(struct vfio_iommu_type1_dirty_bitmap_get) != 0) {
return -EINVAL;
}
*nr_iovecs = 1 + size / sizeof(struct vfio_iommu_type1_dirty_bitmap_get);
*iovecs = malloc(*nr_iovecs * sizeof(struct iovec));
if (*iovecs == NULL) {
return -ENOMEM;
}
for (i = 1; i < *nr_iovecs; i++) {
struct vfio_iommu_type1_dirty_bitmap_get *r = &ranges[(i - 1)]; /* FIXME ugly indexing */
ret = dma_controller_dirty_page_get(vfu_ctx->dma, r->iova, r->size,
r->bitmap.pgsize, r->bitmap.size,
(char**)&((*iovecs)[i].iov_base));
if (ret != 0) {
goto out;
}
(*iovecs)[i].iov_len = r->bitmap.size;
}
out:
if (ret != 0) {
if (*iovecs != NULL) {
free(*iovecs);
*iovecs = NULL;
}
}
return ret;
}
static int
handle_dirty_pages(vfu_ctx_t *vfu_ctx, uint32_t size,
struct iovec **iovecs, size_t *nr_iovecs,
struct vfio_iommu_type1_dirty_bitmap *dirty_bitmap)
{
int ret;
assert(vfu_ctx != NULL);
assert(iovecs != NULL);
assert(nr_iovecs != NULL);
assert(dirty_bitmap != NULL);
if (size < sizeof *dirty_bitmap || size != dirty_bitmap->argsz) {
vfu_log(vfu_ctx, VFU_ERR, "invalid header size %u", size);
return -EINVAL;
}
if (dirty_bitmap->flags & VFIO_IOMMU_DIRTY_PAGES_FLAG_START) {
ret = dma_controller_dirty_page_logging_start(vfu_ctx->dma,
migration_get_pgsize(vfu_ctx->migration));
} else if (dirty_bitmap->flags & VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP) {
ret = dma_controller_dirty_page_logging_stop(vfu_ctx->dma);
} else if (dirty_bitmap->flags & VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP) {
ret = handle_dirty_pages_get(vfu_ctx, iovecs, nr_iovecs,
(struct vfio_iommu_type1_dirty_bitmap_get*)(dirty_bitmap + 1),
size - sizeof *dirty_bitmap);
} else {
vfu_log(vfu_ctx, VFU_ERR, "bad flags %#x", dirty_bitmap->flags);
ret = -EINVAL;
}
return ret;
}
/*
* FIXME return value is messed up, sometimes we return -1 and set errno while
* other times we return -errno. Fix.
*/
/*
* Returns 0 if the header is valid, -errno otherwise.
*/
static int
validate_header(vfu_ctx_t *vfu_ctx, struct vfio_user_header *hdr, size_t size)
{
assert(hdr != NULL);
if (size < sizeof hdr) {
vfu_log(vfu_ctx, VFU_ERR, "short header read %ld", size);
return -EINVAL;
}
if (hdr->flags.type != VFIO_USER_F_TYPE_COMMAND) {
vfu_log(vfu_ctx, VFU_ERR, "header not a request");
return -EINVAL;
}
if (hdr->msg_size < sizeof hdr) {
vfu_log(vfu_ctx, VFU_ERR, "bad size in header %d", hdr->msg_size);
return -EINVAL;
}
return 0;
}
/*
* Populates @hdr to contain the header for the next command to be processed.
* Stores any passed FDs into @fds and the number in @nr_fds.
*
* Returns 0 if there is no command to process, -errno if an error occured, or
* the number of bytes read.
*/
int
get_next_command(vfu_ctx_t *vfu_ctx, struct vfio_user_header *hdr, int *fds,
size_t *nr_fds)
{
int ret;
/* FIXME get request shouldn't set errno, it should return it as -errno */
ret = vfu_ctx->trans->get_request(vfu_ctx, hdr, fds, nr_fds);
if (unlikely(ret < 0)) {
if (ret == -EAGAIN || ret == -EWOULDBLOCK) {
return 0;
}
if (ret != -EINTR) {
vfu_log(vfu_ctx, VFU_ERR, "failed to receive request: %s",
strerror(-ret));
}
return ret;
}
if (unlikely(ret == 0)) {
if (errno == EINTR) {
return -EINTR;
}
if (errno == 0) {
vfu_log(vfu_ctx, VFU_INF, "vfio-user client closed connection");
} else {
vfu_log(vfu_ctx, VFU_ERR, "end of file: %m");
}
return -ENOTCONN;
}
return ret;
}
UNIT_TEST_SYMBOL(get_next_command);
#define get_next_command __wrap_get_next_command
int
exec_command(vfu_ctx_t *vfu_ctx, struct vfio_user_header *hdr, size_t size,
int *fds, size_t nr_fds,
struct iovec *_iovecs, struct iovec **iovecs, size_t *nr_iovecs,
bool *free_iovec_data)
{
int ret;
struct vfio_irq_info irq_info;
struct vfio_device_info dev_info;
struct vfio_region_info *dev_reg_info = NULL;
void *cmd_data = NULL;
assert(vfu_ctx != NULL);
assert(hdr != NULL);
assert(fds != NULL);
assert(_iovecs != NULL);
assert(iovecs != NULL);
assert(free_iovec_data != NULL);
ret = validate_header(vfu_ctx, hdr, size);
if (ret < 0) {
return ret;
}
/*
* TODO from now on if an error occurs we still need to reply. Move this
* code into a separate function so that we don't have to use goto.
*/
hdr->msg_size -= sizeof(struct vfio_user_header);
if (hdr->msg_size > 0) {
cmd_data = malloc(hdr->msg_size);
if (cmd_data == NULL) {
ret = -ENOMEM;
goto reply;
}
// FIXME: should be transport op
ret = recv(vfu_ctx->conn_fd, cmd_data, hdr->msg_size, 0);
if (ret < 0) {
ret = -errno;
goto reply;
}
if (ret != (int)hdr->msg_size) {
vfu_log(vfu_ctx, VFU_ERR, "short read, expected=%d, actual=%d",
hdr->msg_size, ret);
ret = -EINVAL;
goto reply;
}
}
if (device_is_stopped_and_copying(vfu_ctx->migration)
&& !(hdr->cmd == VFIO_USER_REGION_READ || hdr->cmd == VFIO_USER_REGION_WRITE)) {
vfu_log(vfu_ctx, VFU_ERR,
"bad command %d while device in stop-and-copy state", hdr->cmd);
ret = -EINVAL;
goto reply;
}
switch (hdr->cmd) {
case VFIO_USER_DMA_MAP:
case VFIO_USER_DMA_UNMAP:
ret = handle_dma_map_or_unmap(vfu_ctx, hdr->msg_size,
hdr->cmd == VFIO_USER_DMA_MAP,
fds, nr_fds, cmd_data);
break;
case VFIO_USER_DEVICE_GET_INFO:
ret = handle_device_get_info(vfu_ctx, hdr->msg_size, &dev_info);
if (ret >= 0) {
_iovecs[1].iov_base = &dev_info;
_iovecs[1].iov_len = dev_info.argsz;
*iovecs = _iovecs;
*nr_iovecs = 2;
}
break;
case VFIO_USER_DEVICE_GET_REGION_INFO:
ret = handle_device_get_region_info(vfu_ctx, hdr->msg_size, cmd_data,
&dev_reg_info);
if (ret == 0) {
_iovecs[1].iov_base = dev_reg_info;
_iovecs[1].iov_len = dev_reg_info->argsz;
*iovecs = _iovecs;
*nr_iovecs = 2;
}
break;
case VFIO_USER_DEVICE_GET_IRQ_INFO:
ret = handle_device_get_irq_info(vfu_ctx, hdr->msg_size, cmd_data,
&irq_info);
if (ret == 0) {
_iovecs[1].iov_base = &irq_info;
_iovecs[1].iov_len = sizeof irq_info;
*iovecs = _iovecs;
*nr_iovecs = 2;
}
break;
case VFIO_USER_DEVICE_SET_IRQS:
ret = handle_device_set_irqs(vfu_ctx, hdr->msg_size, fds, nr_fds,
cmd_data);
break;
case VFIO_USER_REGION_READ:
case VFIO_USER_REGION_WRITE:
*iovecs = _iovecs;
ret = handle_region_access(vfu_ctx, hdr->msg_size, hdr->cmd,
&(*iovecs)[1].iov_base,
&(*iovecs)[1].iov_len,
cmd_data);
*nr_iovecs = 2;
break;
case VFIO_USER_DEVICE_RESET:
ret = handle_device_reset(vfu_ctx);
break;
case VFIO_USER_DIRTY_PAGES:
// FIXME: don't allow migration calls if migration == NULL
ret = handle_dirty_pages(vfu_ctx, hdr->msg_size, iovecs, nr_iovecs,
cmd_data);
if (ret >= 0) {
*free_iovec_data = false;
}
break;
default:
vfu_log(vfu_ctx, VFU_ERR, "bad command %d", hdr->cmd);
ret = -EINVAL;
goto reply;
}
reply:
free(cmd_data);
return ret;
}
UNIT_TEST_SYMBOL(exec_command);
#define exec_command __wrap_exec_command
int
process_request(vfu_ctx_t *vfu_ctx)
{
struct vfio_user_header hdr = { 0, };
int ret;
int *fds = NULL;
size_t nr_fds, i;
struct iovec _iovecs[2] = { { 0, } };
struct iovec *iovecs = NULL;
size_t nr_iovecs = 0;
bool free_iovec_data = true;
assert(vfu_ctx != NULL);
if (device_is_stopped(vfu_ctx->migration)) {
return -ESHUTDOWN;
}
/*
* FIXME if migration device state is VFIO_DEVICE_STATE_STOP then only
* migration-related operations should execute. However, some operations
* are harmless (e.g. get region info). At the minimum we should fail
* accesses to device regions other than the migration region. I'd expect
* DMA unmap and get dirty pages to be required even in the stop-and-copy
* state.
*/
nr_fds = vfu_ctx->client_max_fds;
fds = alloca(nr_fds * sizeof(int));
ret = get_next_command(vfu_ctx, &hdr, fds, &nr_fds);
if (ret <= 0) {
return ret;
}
ret = exec_command(vfu_ctx, &hdr, ret, fds, nr_fds, _iovecs, &iovecs,
&nr_iovecs, &free_iovec_data);
for (i = 0; i < nr_fds; i++) {
if (fds[i] != -1) {
vfu_log(vfu_ctx, VFU_INF, "closing fd=%d", fds[i]);
close(fds[i]);
}
}
/*
* TODO: In case of error during command handling set errno respectively
* in the reply message.
*/
if (ret < 0) {
vfu_log(vfu_ctx, VFU_ERR, "failed to handle command %d: %s", hdr.cmd,
strerror(-ret));
} else {
ret = 0;
}
// FIXME: SPEC: should the reply include the command? I'd say yes?
ret = vfu_send_iovec(vfu_ctx->conn_fd, hdr.msg_id, true,
0, iovecs, nr_iovecs, NULL, 0, -ret);
if (unlikely(ret < 0)) {
vfu_log(vfu_ctx, VFU_ERR, "failed to complete command: %s",
strerror(-ret));
}
if (iovecs != NULL && iovecs != _iovecs) {
if (free_iovec_data) {
size_t i;
for (i = 0; i < nr_iovecs; i++) {
free(iovecs[i].iov_base);
}
}
free(iovecs);
}
return ret;
}
static int
prepare_ctx(vfu_ctx_t *vfu_ctx)
{
vfu_reg_info_t *cfg_reg;
const vfu_reg_info_t zero_reg = { 0 };
int err;
uint32_t max_ivs = 0, i;
size_t size;
if (vfu_ctx->ready != 0) {
return 0;
}
/*
* With LIBVFIO_USER_FLAG_ATTACH_NB caller is always expected to call
* vfu_ctx_try_attach().
*/
if ((vfu_ctx->flags & LIBVFIO_USER_FLAG_ATTACH_NB) == 0) {
vfu_ctx->conn_fd = vfu_ctx->trans->attach(vfu_ctx);
if (vfu_ctx->conn_fd < 0) {
err = vfu_ctx->conn_fd;
if (err != EINTR) {
vfu_log(vfu_ctx, VFU_ERR, "failed to attach: %s",
strerror(-err));
}
return err;
}
}
cfg_reg = &vfu_ctx->reg_info[VFU_PCI_DEV_CFG_REGION_IDX];
// Set a default config region if none provided.
/* TODO should it be enough to check that the size of region is 0? */
if (memcmp(cfg_reg, &zero_reg, sizeof(*cfg_reg)) == 0) {
cfg_reg->flags = VFU_REG_FLAG_RW;
cfg_reg->size = PCI_CFG_SPACE_SIZE;
}
// This maybe allocated by vfu_setup_pci_config_hdr().
if (vfu_ctx->pci_config_space == NULL) {
vfu_ctx->pci_config_space = calloc(1, cfg_reg->size);
if (vfu_ctx->pci_config_space == NULL) {
return -ENOMEM;
}
}
// Set type for region registers.
for (i = 0; i < PCI_BARS_NR; i++) {
if (!(vfu_ctx->reg_info[i].flags & VFU_REG_FLAG_MEM)) {
vfu_ctx->pci_config_space->hdr.bars[i].io.region_type |= 0x1;
}
}
if (vfu_ctx->irqs == NULL) {
/*
* FIXME need to check that the number of MSI and MSI-X IRQs are valid
* (1, 2, 4, 8, 16 or 32 for MSI and up to 2048 for MSI-X).
*/
// Work out highest count of irq vectors.
for (i = 0; i < VFU_DEV_NUM_IRQS; i++) {
if (max_ivs < vfu_ctx->irq_count[i]) {
max_ivs = vfu_ctx->irq_count[i];
}
}
//FIXME: assert(max_ivs > 0)?
size = sizeof(int) * max_ivs;
vfu_ctx->irqs = calloc(1, sizeof(vfu_irqs_t) + size);
if (vfu_ctx->irqs == NULL) {
// vfu_ctx->pci_config_space should be free'ed by vfu_destroy_ctx().
return -ENOMEM;
}
// Set context irq information.
for (i = 0; i < max_ivs; i++) {
vfu_ctx->irqs->efds[i] = -1;
}
vfu_ctx->irqs->err_efd = -1;
vfu_ctx->irqs->req_efd = -1;
vfu_ctx->irqs->type = IRQ_NONE;
vfu_ctx->irqs->max_ivs = max_ivs;
// Reflect on the config space whether INTX is available.
if (vfu_ctx->irq_count[VFU_DEV_INTX_IRQ] != 0) {
vfu_ctx->pci_config_space->hdr.intr.ipin = 1; // INTA#
}
}
if (vfu_ctx->caps != NULL) {
vfu_ctx->pci_config_space->hdr.sts.cl = 0x1;
vfu_ctx->pci_config_space->hdr.cap = PCI_STD_HEADER_SIZEOF;
}
vfu_ctx->ready = 1;
return 0;
}
int
vfu_ctx_drive(vfu_ctx_t *vfu_ctx)
{
int err;
if (vfu_ctx == NULL) {
return ERROR(EINVAL);
}
err = prepare_ctx(vfu_ctx);
if (err < 0) {
return ERROR(-err);
}
do {
err = process_request(vfu_ctx);
} while (err >= 0);
return err;
}
int
vfu_ctx_poll(vfu_ctx_t *vfu_ctx)
{
int err;
if (unlikely((vfu_ctx->flags & LIBVFIO_USER_FLAG_ATTACH_NB) == 0)) {
return -ENOTSUP;
}
assert(vfu_ctx->ready == 1);
err = process_request(vfu_ctx);
return err >= 0 ? 0 : err;
}
/* FIXME this is not enough anymore ? */
void *
vfu_mmap(vfu_ctx_t *vfu_ctx, off_t offset, size_t length)
{
if ((vfu_ctx == NULL) || (length == 0) || !PAGE_ALIGNED(offset)) {
if (vfu_ctx != NULL) {
vfu_log(vfu_ctx, VFU_DBG, "bad device mmap region %#lx-%#lx\n",
offset, offset + length);
}
errno = EINVAL;
return MAP_FAILED;
}
return mmap(NULL, length, PROT_READ | PROT_WRITE, MAP_SHARED,
vfu_ctx->fd, offset);
}
static void
free_sparse_mmap_areas(vfu_ctx_t *vfu_ctx)
{
int i;
assert(vfu_ctx != NULL);
for (i = 0; i < (int)vfu_ctx->nr_regions; i++) {
free(vfu_ctx->reg_info[i].mmap_areas);
}
}
void
vfu_destroy_ctx(vfu_ctx_t *vfu_ctx)
{
if (vfu_ctx == NULL) {
return;
}
free(vfu_ctx->uuid);
free(vfu_ctx->pci_config_space);
if (vfu_ctx->trans->detach != NULL) {
vfu_ctx->trans->detach(vfu_ctx);
}
if (vfu_ctx->dma != NULL) {
dma_controller_destroy(vfu_ctx->dma);
}
free_sparse_mmap_areas(vfu_ctx);
free(vfu_ctx->reg_info);
free(vfu_ctx->caps);
free(vfu_ctx->migration);
free(vfu_ctx->irqs);
free(vfu_ctx);
// FIXME: Maybe close any open irq efds? Unmap stuff?
}
int
vfu_ctx_try_attach(vfu_ctx_t *vfu_ctx)
{
int err;
assert(vfu_ctx != NULL);
if ((vfu_ctx->flags & LIBVFIO_USER_FLAG_ATTACH_NB) == 0) {
return ERROR(EINVAL);
}
err = prepare_ctx(vfu_ctx);
if (err < 0) {
return ERROR(-err);
}
return vfu_ctx->trans->attach(vfu_ctx);
}
bool
is_valid_pci_type(vfu_pci_type_t t)
{
return t >= VFU_PCI_TYPE_CONVENTIONAL && t <= VFU_PCI_TYPE_EXPRESS;
}
vfu_ctx_t *
vfu_create_ctx(vfu_trans_t trans, const char *path, int flags, void *pvt,
vfu_dev_type_t dev_type)
{
vfu_ctx_t *vfu_ctx = NULL;
int err = 0;
if (trans != VFU_TRANS_SOCK) {
errno = ENOTSUP;
return NULL;
}
if (dev_type != VFU_DEV_TYPE_PCI) {
errno = EINVAL;
return NULL;
}
vfu_ctx = calloc(1, sizeof(vfu_ctx_t));
if (vfu_ctx == NULL) {
return NULL;
}
vfu_ctx->dev_type = dev_type;
vfu_ctx->trans = &sock_transport_ops;
//FIXME: Validate arguments.
// Set other context data.
vfu_ctx->pvt = pvt;
vfu_ctx->flags = flags;
vfu_ctx->log_lvl = VFU_ERR;
vfu_ctx->uuid = strdup(path);
if (vfu_ctx->uuid == NULL) {
err = errno;
goto out;
}
/*
* FIXME: Now we always allocate for migration region. Check if its better
* to seperate migration region from standard regions in vfu_ctx.reg_info
* and move it into vfu_ctx.migration.
*/
vfu_ctx->nr_regions = VFU_PCI_DEV_NUM_REGIONS + 1;
vfu_ctx->reg_info = calloc(vfu_ctx->nr_regions, sizeof *vfu_ctx->reg_info);
if (vfu_ctx->reg_info == NULL) {
err = -ENOMEM;
goto out;
}
if (vfu_ctx->trans->init != NULL) {
err = vfu_ctx->trans->init(vfu_ctx);
if (err < 0) {
goto out;
}
vfu_ctx->fd = err;
}
err = 0;
out:
if (err != 0) {
if (vfu_ctx != NULL) {
vfu_destroy_ctx(vfu_ctx);
vfu_ctx = NULL;
}
errno = -err;
}
return vfu_ctx;
}
int
vfu_setup_log(vfu_ctx_t *vfu_ctx, vfu_log_fn_t *log, vfu_log_lvl_t log_lvl)
{
if (log_lvl != VFU_ERR && log_lvl != VFU_INF && log_lvl != VFU_DBG) {
return ERROR(EINVAL);
}
vfu_ctx->log = log;
vfu_ctx->log_lvl = log_lvl;
return 0;
}
int
vfu_pci_setup_config_hdr(vfu_ctx_t *vfu_ctx, vfu_pci_hdr_id_t id,
vfu_pci_hdr_ss_t ss, vfu_pci_hdr_cc_t cc,
vfu_pci_type_t pci_type,
int revision __attribute__((unused)))
{
vfu_pci_config_space_t *config_space;
size_t size;
assert(vfu_ctx != NULL);
/*
* TODO there no real reason why we shouldn't allow this, we should just
* clean up and redo it.
*/
if (vfu_ctx->pci_config_space != NULL) {
vfu_log(vfu_ctx, VFU_ERR, "PCI configuration space header already setup");
return ERROR(EEXIST);
}
switch (vfu_ctx->pci_type) {
case VFU_PCI_TYPE_CONVENTIONAL:
case VFU_PCI_TYPE_PCI_X_1:
size = PCI_CFG_SPACE_SIZE;
break;
case VFU_PCI_TYPE_PCI_X_2:
case VFU_PCI_TYPE_EXPRESS:
size = PCI_CFG_SPACE_EXP_SIZE;
break;
default:
vfu_log(vfu_ctx, VFU_ERR, "invalid PCI type %d", pci_type);
return ERROR(EINVAL);
}
// Allocate a buffer for the config space.
config_space = calloc(1, size);
if (config_space == NULL) {
return ERROR(ENOMEM);
}
config_space->hdr.id = id;
config_space->hdr.ss = ss;
config_space->hdr.cc = cc;
vfu_ctx->pci_config_space = config_space;
vfu_ctx->reg_info[VFU_PCI_DEV_CFG_REGION_IDX].size = size;
return 0;
}
int
vfu_pci_setup_caps(vfu_ctx_t *vfu_ctx, vfu_cap_t **caps, int nr_caps)
{
int ret;
assert(vfu_ctx != NULL);
if (vfu_ctx->caps != NULL) {
vfu_log(vfu_ctx, VFU_ERR, "capabilities are already setup");
return ERROR(EEXIST);
}
if (caps == NULL || nr_caps == 0) {
vfu_log(vfu_ctx, VFU_ERR, "Invalid args passed");
return ERROR(EINVAL);
}
vfu_ctx->caps = caps_create(vfu_ctx, caps, nr_caps, &ret);
if (vfu_ctx->caps == NULL) {
vfu_log(vfu_ctx, VFU_ERR, "failed to create PCI capabilities: %s",
strerror(ret));
return ERROR(ret);
}
return 0;
}
static int
copy_sparse_mmap_areas(vfu_reg_info_t *reg_info,
struct vfu_mmap_area *mmap_areas, uint32_t nr_mmap_areas)
{
struct vfu_sparse_mmap_areas *smmap_areas;
size_t areas_sz;
if (mmap_areas == NULL || nr_mmap_areas == 0) {
return 0;
}
areas_sz = nr_mmap_areas * sizeof(struct vfu_mmap_area);
smmap_areas = calloc(1, sizeof(struct vfu_sparse_mmap_areas) + areas_sz);
if (smmap_areas == NULL) {
return -ENOMEM;
}
smmap_areas->nr_mmap_areas = nr_mmap_areas;
memcpy(smmap_areas->areas, mmap_areas, areas_sz);
reg_info->mmap_areas = smmap_areas;
return 0;
}
int
vfu_setup_region(vfu_ctx_t *vfu_ctx, int region_idx, size_t size,
vfu_region_access_cb_t *region_access, int flags,
struct vfu_mmap_area *mmap_areas, uint32_t nr_mmap_areas,
vfu_map_region_cb_t *map)
{
int ret;
assert(vfu_ctx != NULL);
switch(region_idx) {
case VFU_PCI_DEV_BAR0_REGION_IDX ... VFU_PCI_DEV_VGA_REGION_IDX:
// Validate the config region provided.
if (region_idx == VFU_PCI_DEV_CFG_REGION_IDX &&
flags != VFU_REG_FLAG_RW) {
return ERROR(EINVAL);
}
vfu_ctx->reg_info[region_idx].flags = flags;
vfu_ctx->reg_info[region_idx].size = size;
vfu_ctx->reg_info[region_idx].fn = region_access;
if (map != NULL) {
vfu_ctx->reg_info[region_idx].map = map;
}
if (mmap_areas) {
ret = copy_sparse_mmap_areas(&vfu_ctx->reg_info[region_idx],
mmap_areas, nr_mmap_areas);
if (ret < 0) {
return ERROR(-ret);
}
}
break;
default:
vfu_log(vfu_ctx, VFU_ERR, "Invalid region index %d", region_idx);
return ERROR(EINVAL);
}
return 0;
}
int
vfu_setup_device_reset_cb(vfu_ctx_t *vfu_ctx, vfu_reset_cb_t *reset)
{
assert(vfu_ctx != NULL);
vfu_ctx->reset = reset;
return 0;
}
int
vfu_setup_device_dma_cb(vfu_ctx_t *vfu_ctx, vfu_map_dma_cb_t *map_dma,
vfu_unmap_dma_cb_t *unmap_dma)
{
assert(vfu_ctx != NULL);
vfu_ctx->map_dma = map_dma;
vfu_ctx->unmap_dma = unmap_dma;
// Create the internal DMA controller.
if (vfu_ctx->unmap_dma != NULL) {
vfu_ctx->dma = dma_controller_create(vfu_ctx, VFU_DMA_REGIONS);
if (vfu_ctx->dma == NULL) {
return ERROR(ENOMEM);
}
}
return 0;
}
int
vfu_setup_device_nr_irqs(vfu_ctx_t *vfu_ctx, enum vfu_dev_irq_type type,
uint32_t count)
{
assert(vfu_ctx != NULL);
if (type < VFU_DEV_INTX_IRQ || type > VFU_DEV_REQ_IRQ) {
vfu_log(vfu_ctx, VFU_ERR, "Invalid IRQ index %d, should be between "
"(%d to %d)", type, VFU_DEV_INTX_IRQ,
VFU_DEV_REQ_IRQ);
return ERROR(EINVAL);
}
vfu_ctx->irq_count[type] = count;
return 0;
}
int
vfu_setup_device_migration(vfu_ctx_t *vfu_ctx, vfu_migration_t *migration)
{
vfu_reg_info_t *migr_reg;
int ret = 0;
assert(vfu_ctx != NULL);
//FIXME: Validate args.
if (vfu_ctx->migr_reg != NULL) {
vfu_log(vfu_ctx, VFU_ERR, "device migration is already setup");
return ERROR(EEXIST);
}
/* FIXME hacky, find a more robust way to allocate a region index */
migr_reg = &vfu_ctx->reg_info[(vfu_ctx->nr_regions - 1)];
/* FIXME: Are there sparse areas need to be setup flags accordingly */
ret = copy_sparse_mmap_areas(migr_reg, migration->mmap_areas,
migration->nr_mmap_areas);
if (ret < 0) {
return ERROR(-ret);
}
migr_reg->flags = VFU_REG_FLAG_RW;
migr_reg->size = sizeof(struct vfio_device_migration_info) + migration->size;
vfu_ctx->migration = init_migration(migration, &ret);
if (vfu_ctx->migration == NULL) {
vfu_log(vfu_ctx, VFU_ERR, "failed to initialize device migration");
free(migr_reg->mmap_areas);
return ERROR(ret);
}
vfu_ctx->migr_reg = migr_reg;
return 0;
}
/*
* Returns a pointer to the standard part of the PCI configuration space.
*/
inline vfu_pci_config_space_t *
vfu_pci_get_config_space(vfu_ctx_t *vfu_ctx)
{
assert(vfu_ctx != NULL);
return vfu_ctx->pci_config_space;
}
/*
* Returns a pointer to the non-standard part of the PCI configuration space.
*/
inline uint8_t *
vfu_get_pci_non_std_config_space(vfu_ctx_t *vfu_ctx)
{
assert(vfu_ctx != NULL);
return (uint8_t *)&vfu_ctx->pci_config_space->non_std;
}
inline vfu_reg_info_t *
vfu_get_region_info(vfu_ctx_t *vfu_ctx)
{
assert(vfu_ctx != NULL);
return vfu_ctx->reg_info;
}
inline int
vfu_addr_to_sg(vfu_ctx_t *vfu_ctx, dma_addr_t dma_addr,
uint32_t len, dma_sg_t *sg, int max_sg, int prot)
{
assert(vfu_ctx != NULL);
if (unlikely(vfu_ctx->unmap_dma == NULL)) {
errno = EINVAL;
return -1;
}
return dma_addr_to_sg(vfu_ctx->dma, dma_addr, len, sg, max_sg, prot);
}
inline int
vfu_map_sg(vfu_ctx_t *vfu_ctx, const dma_sg_t *sg,
struct iovec *iov, int cnt)
{
if (unlikely(vfu_ctx->unmap_dma == NULL)) {
errno = EINVAL;
return -1;
}
return dma_map_sg(vfu_ctx->dma, sg, iov, cnt);
}
inline void
vfu_unmap_sg(vfu_ctx_t *vfu_ctx, const dma_sg_t *sg, struct iovec *iov, int cnt)
{
if (unlikely(vfu_ctx->unmap_dma == NULL)) {
return;
}
return dma_unmap_sg(vfu_ctx->dma, sg, iov, cnt);
}
uint8_t *
vfu_ctx_get_cap(vfu_ctx_t *vfu_ctx, uint8_t id)
{
assert(vfu_ctx != NULL);
return cap_find_by_id(vfu_ctx, id);
}
int
vfu_dma_read(vfu_ctx_t *vfu_ctx, dma_sg_t *sg, void *data)
{
struct vfio_user_dma_region_access *dma_recv;
struct vfio_user_dma_region_access dma_send;
int recv_size;
int msg_id = 1, ret;
assert(vfu_ctx != NULL);
assert(sg != NULL);
recv_size = sizeof(*dma_recv) + sg->length;
dma_recv = calloc(recv_size, 1);
if (dma_recv == NULL) {
return -ENOMEM;
}
dma_send.addr = sg->dma_addr;
dma_send.count = sg->length;
ret = vfu_msg(vfu_ctx->conn_fd, msg_id, VFIO_USER_DMA_READ,
&dma_send, sizeof dma_send, NULL,
dma_recv, recv_size);
memcpy(data, dma_recv->data, sg->length); /* FIXME no need for memcpy */
free(dma_recv);
return ret;
}
int
vfu_dma_write(vfu_ctx_t *vfu_ctx, dma_sg_t *sg, void *data)
{
struct vfio_user_dma_region_access *dma_send, dma_recv;
int send_size = sizeof(*dma_send) + sg->length;
int msg_id = 1, ret;
assert(vfu_ctx != NULL);
assert(sg != NULL);
dma_send = calloc(send_size, 1);
if (dma_send == NULL) {
return -ENOMEM;
}
dma_send->addr = sg->dma_addr;
dma_send->count = sg->length;
memcpy(dma_send->data, data, sg->length); /* FIXME no need to copy! */
ret = vfu_msg(vfu_ctx->conn_fd, msg_id, VFIO_USER_DMA_WRITE,
dma_send, send_size, NULL,
&dma_recv, sizeof(dma_recv));
free(dma_send);
return ret;
}
/* ex: set tabstop=4 shiftwidth=4 softtabstop=4 expandtab: */
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