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/*
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* vhost support
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*
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* Copyright Red Hat, Inc. 2010
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*
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* Authors:
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* Michael S. Tsirkin <mst@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*/
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#include <sys/ioctl.h> |
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#include "vhost.h" |
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#include "hw/hw.h" |
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#include "range.h" |
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#include <linux/vhost.h> |
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|
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static void vhost_dev_sync_region(struct vhost_dev *dev, |
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uint64_t mfirst, uint64_t mlast, |
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uint64_t rfirst, uint64_t rlast) |
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{ |
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uint64_t start = MAX(mfirst, rfirst); |
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uint64_t end = MIN(mlast, rlast); |
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vhost_log_chunk_t *from = dev->log + start / VHOST_LOG_CHUNK; |
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vhost_log_chunk_t *to = dev->log + end / VHOST_LOG_CHUNK + 1;
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uint64_t addr = (start / VHOST_LOG_CHUNK) * VHOST_LOG_CHUNK; |
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|
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assert(end / VHOST_LOG_CHUNK < dev->log_size); |
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assert(start / VHOST_LOG_CHUNK < dev->log_size); |
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if (end < start) {
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return;
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} |
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for (;from < to; ++from) {
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vhost_log_chunk_t log; |
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int bit;
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/* We first check with non-atomic: much cheaper,
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* and we expect non-dirty to be the common case. */
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if (!*from) {
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continue;
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} |
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/* Data must be read atomically. We don't really
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* need the barrier semantics of __sync
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* builtins, but it's easier to use them than
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* roll our own. */
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log = __sync_fetch_and_and(from, 0);
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while ((bit = sizeof(log) > sizeof(int) ? |
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ffsll(log) : ffs(log))) { |
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bit -= 1;
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cpu_physical_memory_set_dirty(addr + bit * VHOST_LOG_PAGE); |
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log &= ~(0x1ull << bit);
|
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} |
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addr += VHOST_LOG_CHUNK; |
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} |
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} |
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|
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static int vhost_client_sync_dirty_bitmap(CPUPhysMemoryClient *client, |
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target_phys_addr_t start_addr, |
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target_phys_addr_t end_addr) |
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{ |
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struct vhost_dev *dev = container_of(client, struct vhost_dev, client); |
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int i;
|
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if (!dev->log_enabled || !dev->started) {
|
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return 0; |
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} |
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for (i = 0; i < dev->mem->nregions; ++i) { |
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struct vhost_memory_region *reg = dev->mem->regions + i;
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vhost_dev_sync_region(dev, start_addr, end_addr, |
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reg->guest_phys_addr, |
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range_get_last(reg->guest_phys_addr, |
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reg->memory_size)); |
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} |
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for (i = 0; i < dev->nvqs; ++i) { |
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struct vhost_virtqueue *vq = dev->vqs + i;
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vhost_dev_sync_region(dev, start_addr, end_addr, vq->used_phys, |
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range_get_last(vq->used_phys, vq->used_size)); |
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} |
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return 0; |
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} |
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|
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/* Assign/unassign. Keep an unsorted array of non-overlapping
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* memory regions in dev->mem. */
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static void vhost_dev_unassign_memory(struct vhost_dev *dev, |
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uint64_t start_addr, |
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uint64_t size) |
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{ |
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int from, to, n = dev->mem->nregions;
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/* Track overlapping/split regions for sanity checking. */
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int overlap_start = 0, overlap_end = 0, overlap_middle = 0, split = 0; |
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|
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for (from = 0, to = 0; from < n; ++from, ++to) { |
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struct vhost_memory_region *reg = dev->mem->regions + to;
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uint64_t reglast; |
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uint64_t memlast; |
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uint64_t change; |
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|
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/* clone old region */
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if (to != from) {
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memcpy(reg, dev->mem->regions + from, sizeof *reg);
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} |
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|
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/* No overlap is simple */
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if (!ranges_overlap(reg->guest_phys_addr, reg->memory_size,
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start_addr, size)) { |
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continue;
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} |
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|
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/* Split only happens if supplied region
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* is in the middle of an existing one. Thus it can not
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* overlap with any other existing region. */
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assert(!split); |
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reglast = range_get_last(reg->guest_phys_addr, reg->memory_size); |
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memlast = range_get_last(start_addr, size); |
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|
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/* Remove whole region */
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if (start_addr <= reg->guest_phys_addr && memlast >= reglast) {
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--dev->mem->nregions; |
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--to; |
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assert(to >= 0);
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++overlap_middle; |
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continue;
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} |
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|
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/* Shrink region */
|
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if (memlast >= reglast) {
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reg->memory_size = start_addr - reg->guest_phys_addr; |
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assert(reg->memory_size); |
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assert(!overlap_end); |
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++overlap_end; |
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continue;
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} |
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|
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/* Shift region */
|
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if (start_addr <= reg->guest_phys_addr) {
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change = memlast + 1 - reg->guest_phys_addr;
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reg->memory_size -= change; |
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reg->guest_phys_addr += change; |
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reg->userspace_addr += change; |
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assert(reg->memory_size); |
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assert(!overlap_start); |
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++overlap_start; |
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continue;
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} |
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|
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/* This only happens if supplied region
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* is in the middle of an existing one. Thus it can not
|
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* overlap with any other existing region. */
|
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assert(!overlap_start); |
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assert(!overlap_end); |
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assert(!overlap_middle); |
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/* Split region: shrink first part, shift second part. */
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memcpy(dev->mem->regions + n, reg, sizeof *reg);
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reg->memory_size = start_addr - reg->guest_phys_addr; |
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assert(reg->memory_size); |
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change = memlast + 1 - reg->guest_phys_addr;
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reg = dev->mem->regions + n; |
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reg->memory_size -= change; |
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assert(reg->memory_size); |
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reg->guest_phys_addr += change; |
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reg->userspace_addr += change; |
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/* Never add more than 1 region */
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assert(dev->mem->nregions == n); |
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++dev->mem->nregions; |
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++split; |
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} |
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} |
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|
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/* Called after unassign, so no regions overlap the given range. */
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static void vhost_dev_assign_memory(struct vhost_dev *dev, |
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uint64_t start_addr, |
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uint64_t size, |
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uint64_t uaddr) |
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{ |
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int from, to;
|
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struct vhost_memory_region *merged = NULL; |
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for (from = 0, to = 0; from < dev->mem->nregions; ++from, ++to) { |
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struct vhost_memory_region *reg = dev->mem->regions + to;
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uint64_t prlast, urlast; |
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uint64_t pmlast, umlast; |
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uint64_t s, e, u; |
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|
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/* clone old region */
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if (to != from) {
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memcpy(reg, dev->mem->regions + from, sizeof *reg);
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} |
187 |
prlast = range_get_last(reg->guest_phys_addr, reg->memory_size); |
188 |
pmlast = range_get_last(start_addr, size); |
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urlast = range_get_last(reg->userspace_addr, reg->memory_size); |
190 |
umlast = range_get_last(uaddr, size); |
191 |
|
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/* check for overlapping regions: should never happen. */
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assert(prlast < start_addr || pmlast < reg->guest_phys_addr); |
194 |
/* Not an adjacent or overlapping region - do not merge. */
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if ((prlast + 1 != start_addr || urlast + 1 != uaddr) && |
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(pmlast + 1 != reg->guest_phys_addr ||
|
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umlast + 1 != reg->userspace_addr)) {
|
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continue;
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} |
200 |
|
201 |
if (merged) {
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--to; |
203 |
assert(to >= 0);
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204 |
} else {
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merged = reg; |
206 |
} |
207 |
u = MIN(uaddr, reg->userspace_addr); |
208 |
s = MIN(start_addr, reg->guest_phys_addr); |
209 |
e = MAX(pmlast, prlast); |
210 |
uaddr = merged->userspace_addr = u; |
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start_addr = merged->guest_phys_addr = s; |
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size = merged->memory_size = e - s + 1;
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assert(merged->memory_size); |
214 |
} |
215 |
|
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if (!merged) {
|
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struct vhost_memory_region *reg = dev->mem->regions + to;
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memset(reg, 0, sizeof *reg); |
219 |
reg->memory_size = size; |
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assert(reg->memory_size); |
221 |
reg->guest_phys_addr = start_addr; |
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reg->userspace_addr = uaddr; |
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++to; |
224 |
} |
225 |
assert(to <= dev->mem->nregions + 1);
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dev->mem->nregions = to; |
227 |
} |
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|
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static uint64_t vhost_get_log_size(struct vhost_dev *dev) |
230 |
{ |
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uint64_t log_size = 0;
|
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int i;
|
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for (i = 0; i < dev->mem->nregions; ++i) { |
234 |
struct vhost_memory_region *reg = dev->mem->regions + i;
|
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uint64_t last = range_get_last(reg->guest_phys_addr, |
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reg->memory_size); |
237 |
log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1);
|
238 |
} |
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for (i = 0; i < dev->nvqs; ++i) { |
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struct vhost_virtqueue *vq = dev->vqs + i;
|
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uint64_t last = vq->used_phys + vq->used_size - 1;
|
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log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1);
|
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} |
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return log_size;
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} |
246 |
|
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static inline void vhost_dev_log_resize(struct vhost_dev* dev, uint64_t size) |
248 |
{ |
249 |
vhost_log_chunk_t *log; |
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uint64_t log_base; |
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int r;
|
252 |
if (size) {
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log = qemu_mallocz(size * sizeof *log);
|
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} else {
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log = NULL;
|
256 |
} |
257 |
log_base = (uint64_t)(unsigned long)log; |
258 |
r = ioctl(dev->control, VHOST_SET_LOG_BASE, &log_base); |
259 |
assert(r >= 0);
|
260 |
vhost_client_sync_dirty_bitmap(&dev->client, 0,
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(target_phys_addr_t)~0x0ull);
|
262 |
if (dev->log) {
|
263 |
qemu_free(dev->log); |
264 |
} |
265 |
dev->log = log; |
266 |
dev->log_size = size; |
267 |
} |
268 |
|
269 |
static int vhost_verify_ring_mappings(struct vhost_dev *dev, |
270 |
uint64_t start_addr, |
271 |
uint64_t size) |
272 |
{ |
273 |
int i;
|
274 |
for (i = 0; i < dev->nvqs; ++i) { |
275 |
struct vhost_virtqueue *vq = dev->vqs + i;
|
276 |
target_phys_addr_t l; |
277 |
void *p;
|
278 |
|
279 |
if (!ranges_overlap(start_addr, size, vq->ring_phys, vq->ring_size)) {
|
280 |
continue;
|
281 |
} |
282 |
l = vq->ring_size; |
283 |
p = cpu_physical_memory_map(vq->ring_phys, &l, 1);
|
284 |
if (!p || l != vq->ring_size) {
|
285 |
fprintf(stderr, "Unable to map ring buffer for ring %d\n", i);
|
286 |
return -ENOMEM;
|
287 |
} |
288 |
if (p != vq->ring) {
|
289 |
fprintf(stderr, "Ring buffer relocated for ring %d\n", i);
|
290 |
return -EBUSY;
|
291 |
} |
292 |
cpu_physical_memory_unmap(p, l, 0, 0); |
293 |
} |
294 |
return 0; |
295 |
} |
296 |
|
297 |
static void vhost_client_set_memory(CPUPhysMemoryClient *client, |
298 |
target_phys_addr_t start_addr, |
299 |
ram_addr_t size, |
300 |
ram_addr_t phys_offset) |
301 |
{ |
302 |
struct vhost_dev *dev = container_of(client, struct vhost_dev, client); |
303 |
ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK; |
304 |
int s = offsetof(struct vhost_memory, regions) + |
305 |
(dev->mem->nregions + 1) * sizeof dev->mem->regions[0]; |
306 |
uint64_t log_size; |
307 |
int r;
|
308 |
dev->mem = qemu_realloc(dev->mem, s); |
309 |
|
310 |
assert(size); |
311 |
|
312 |
vhost_dev_unassign_memory(dev, start_addr, size); |
313 |
if (flags == IO_MEM_RAM) {
|
314 |
/* Add given mapping, merging adjacent regions if any */
|
315 |
vhost_dev_assign_memory(dev, start_addr, size, |
316 |
(uintptr_t)qemu_get_ram_ptr(phys_offset)); |
317 |
} else {
|
318 |
/* Remove old mapping for this memory, if any. */
|
319 |
vhost_dev_unassign_memory(dev, start_addr, size); |
320 |
} |
321 |
|
322 |
if (!dev->started) {
|
323 |
return;
|
324 |
} |
325 |
|
326 |
if (dev->started) {
|
327 |
r = vhost_verify_ring_mappings(dev, start_addr, size); |
328 |
assert(r >= 0);
|
329 |
} |
330 |
|
331 |
if (!dev->log_enabled) {
|
332 |
r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem); |
333 |
assert(r >= 0);
|
334 |
return;
|
335 |
} |
336 |
log_size = vhost_get_log_size(dev); |
337 |
/* We allocate an extra 4K bytes to log,
|
338 |
* to reduce the * number of reallocations. */
|
339 |
#define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log) |
340 |
/* To log more, must increase log size before table update. */
|
341 |
if (dev->log_size < log_size) {
|
342 |
vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER); |
343 |
} |
344 |
r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem); |
345 |
assert(r >= 0);
|
346 |
/* To log less, can only decrease log size after table update. */
|
347 |
if (dev->log_size > log_size + VHOST_LOG_BUFFER) {
|
348 |
vhost_dev_log_resize(dev, log_size); |
349 |
} |
350 |
} |
351 |
|
352 |
static int vhost_virtqueue_set_addr(struct vhost_dev *dev, |
353 |
struct vhost_virtqueue *vq,
|
354 |
unsigned idx, bool enable_log) |
355 |
{ |
356 |
struct vhost_vring_addr addr = {
|
357 |
.index = idx, |
358 |
.desc_user_addr = (uint64_t)(unsigned long)vq->desc, |
359 |
.avail_user_addr = (uint64_t)(unsigned long)vq->avail, |
360 |
.used_user_addr = (uint64_t)(unsigned long)vq->used, |
361 |
.log_guest_addr = vq->used_phys, |
362 |
.flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0, |
363 |
}; |
364 |
int r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr);
|
365 |
if (r < 0) { |
366 |
return -errno;
|
367 |
} |
368 |
return 0; |
369 |
} |
370 |
|
371 |
static int vhost_dev_set_features(struct vhost_dev *dev, bool enable_log) |
372 |
{ |
373 |
uint64_t features = dev->acked_features; |
374 |
int r;
|
375 |
if (enable_log) {
|
376 |
features |= 0x1 << VHOST_F_LOG_ALL;
|
377 |
} |
378 |
r = ioctl(dev->control, VHOST_SET_FEATURES, &features); |
379 |
return r < 0 ? -errno : 0; |
380 |
} |
381 |
|
382 |
static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log) |
383 |
{ |
384 |
int r, t, i;
|
385 |
r = vhost_dev_set_features(dev, enable_log); |
386 |
if (r < 0) { |
387 |
goto err_features;
|
388 |
} |
389 |
for (i = 0; i < dev->nvqs; ++i) { |
390 |
r = vhost_virtqueue_set_addr(dev, dev->vqs + i, i, |
391 |
enable_log); |
392 |
if (r < 0) { |
393 |
goto err_vq;
|
394 |
} |
395 |
} |
396 |
return 0; |
397 |
err_vq:
|
398 |
for (; i >= 0; --i) { |
399 |
t = vhost_virtqueue_set_addr(dev, dev->vqs + i, i, |
400 |
dev->log_enabled); |
401 |
assert(t >= 0);
|
402 |
} |
403 |
t = vhost_dev_set_features(dev, dev->log_enabled); |
404 |
assert(t >= 0);
|
405 |
err_features:
|
406 |
return r;
|
407 |
} |
408 |
|
409 |
static int vhost_client_migration_log(CPUPhysMemoryClient *client, |
410 |
int enable)
|
411 |
{ |
412 |
struct vhost_dev *dev = container_of(client, struct vhost_dev, client); |
413 |
int r;
|
414 |
if (!!enable == dev->log_enabled) {
|
415 |
return 0; |
416 |
} |
417 |
if (!dev->started) {
|
418 |
dev->log_enabled = enable; |
419 |
return 0; |
420 |
} |
421 |
if (!enable) {
|
422 |
r = vhost_dev_set_log(dev, false);
|
423 |
if (r < 0) { |
424 |
return r;
|
425 |
} |
426 |
if (dev->log) {
|
427 |
qemu_free(dev->log); |
428 |
} |
429 |
dev->log = NULL;
|
430 |
dev->log_size = 0;
|
431 |
} else {
|
432 |
vhost_dev_log_resize(dev, vhost_get_log_size(dev)); |
433 |
r = vhost_dev_set_log(dev, true);
|
434 |
if (r < 0) { |
435 |
return r;
|
436 |
} |
437 |
} |
438 |
dev->log_enabled = enable; |
439 |
return 0; |
440 |
} |
441 |
|
442 |
static int vhost_virtqueue_init(struct vhost_dev *dev, |
443 |
struct VirtIODevice *vdev,
|
444 |
struct vhost_virtqueue *vq,
|
445 |
unsigned idx)
|
446 |
{ |
447 |
target_phys_addr_t s, l, a; |
448 |
int r;
|
449 |
struct vhost_vring_file file = {
|
450 |
.index = idx, |
451 |
}; |
452 |
struct vhost_vring_state state = {
|
453 |
.index = idx, |
454 |
}; |
455 |
struct VirtQueue *vvq = virtio_get_queue(vdev, idx);
|
456 |
|
457 |
if (!vdev->binding->set_host_notifier) {
|
458 |
fprintf(stderr, "binding does not support host notifiers\n");
|
459 |
return -ENOSYS;
|
460 |
} |
461 |
|
462 |
vq->num = state.num = virtio_queue_get_num(vdev, idx); |
463 |
r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state); |
464 |
if (r) {
|
465 |
return -errno;
|
466 |
} |
467 |
|
468 |
state.num = virtio_queue_get_last_avail_idx(vdev, idx); |
469 |
r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state); |
470 |
if (r) {
|
471 |
return -errno;
|
472 |
} |
473 |
|
474 |
s = l = virtio_queue_get_desc_size(vdev, idx); |
475 |
a = virtio_queue_get_desc_addr(vdev, idx); |
476 |
vq->desc = cpu_physical_memory_map(a, &l, 0);
|
477 |
if (!vq->desc || l != s) {
|
478 |
r = -ENOMEM; |
479 |
goto fail_alloc_desc;
|
480 |
} |
481 |
s = l = virtio_queue_get_avail_size(vdev, idx); |
482 |
a = virtio_queue_get_avail_addr(vdev, idx); |
483 |
vq->avail = cpu_physical_memory_map(a, &l, 0);
|
484 |
if (!vq->avail || l != s) {
|
485 |
r = -ENOMEM; |
486 |
goto fail_alloc_avail;
|
487 |
} |
488 |
vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx); |
489 |
vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx); |
490 |
vq->used = cpu_physical_memory_map(a, &l, 1);
|
491 |
if (!vq->used || l != s) {
|
492 |
r = -ENOMEM; |
493 |
goto fail_alloc_used;
|
494 |
} |
495 |
|
496 |
vq->ring_size = s = l = virtio_queue_get_ring_size(vdev, idx); |
497 |
vq->ring_phys = a = virtio_queue_get_ring_addr(vdev, idx); |
498 |
vq->ring = cpu_physical_memory_map(a, &l, 1);
|
499 |
if (!vq->ring || l != s) {
|
500 |
r = -ENOMEM; |
501 |
goto fail_alloc_ring;
|
502 |
} |
503 |
|
504 |
r = vhost_virtqueue_set_addr(dev, vq, idx, dev->log_enabled); |
505 |
if (r < 0) { |
506 |
r = -errno; |
507 |
goto fail_alloc;
|
508 |
} |
509 |
r = vdev->binding->set_host_notifier(vdev->binding_opaque, idx, true);
|
510 |
if (r < 0) { |
511 |
fprintf(stderr, "Error binding host notifier: %d\n", -r);
|
512 |
goto fail_host_notifier;
|
513 |
} |
514 |
|
515 |
file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq)); |
516 |
r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file); |
517 |
if (r) {
|
518 |
r = -errno; |
519 |
goto fail_kick;
|
520 |
} |
521 |
|
522 |
file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq)); |
523 |
r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file); |
524 |
if (r) {
|
525 |
r = -errno; |
526 |
goto fail_call;
|
527 |
} |
528 |
|
529 |
return 0; |
530 |
|
531 |
fail_call:
|
532 |
fail_kick:
|
533 |
vdev->binding->set_host_notifier(vdev->binding_opaque, idx, false);
|
534 |
fail_host_notifier:
|
535 |
fail_alloc:
|
536 |
cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx), |
537 |
0, 0); |
538 |
fail_alloc_ring:
|
539 |
cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx), |
540 |
0, 0); |
541 |
fail_alloc_used:
|
542 |
cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx), |
543 |
0, 0); |
544 |
fail_alloc_avail:
|
545 |
cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx), |
546 |
0, 0); |
547 |
fail_alloc_desc:
|
548 |
return r;
|
549 |
} |
550 |
|
551 |
static void vhost_virtqueue_cleanup(struct vhost_dev *dev, |
552 |
struct VirtIODevice *vdev,
|
553 |
struct vhost_virtqueue *vq,
|
554 |
unsigned idx)
|
555 |
{ |
556 |
struct vhost_vring_state state = {
|
557 |
.index = idx, |
558 |
}; |
559 |
int r;
|
560 |
r = vdev->binding->set_host_notifier(vdev->binding_opaque, idx, false);
|
561 |
if (r < 0) { |
562 |
fprintf(stderr, "vhost VQ %d host cleanup failed: %d\n", idx, r);
|
563 |
fflush(stderr); |
564 |
} |
565 |
assert (r >= 0);
|
566 |
r = ioctl(dev->control, VHOST_GET_VRING_BASE, &state); |
567 |
if (r < 0) { |
568 |
fprintf(stderr, "vhost VQ %d ring restore failed: %d\n", idx, r);
|
569 |
fflush(stderr); |
570 |
} |
571 |
virtio_queue_set_last_avail_idx(vdev, idx, state.num); |
572 |
assert (r >= 0);
|
573 |
cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx), |
574 |
0, virtio_queue_get_ring_size(vdev, idx));
|
575 |
cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx), |
576 |
1, virtio_queue_get_used_size(vdev, idx));
|
577 |
cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx), |
578 |
0, virtio_queue_get_avail_size(vdev, idx));
|
579 |
cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx), |
580 |
0, virtio_queue_get_desc_size(vdev, idx));
|
581 |
} |
582 |
|
583 |
int vhost_dev_init(struct vhost_dev *hdev, int devfd) |
584 |
{ |
585 |
uint64_t features; |
586 |
int r;
|
587 |
if (devfd >= 0) { |
588 |
hdev->control = devfd; |
589 |
} else {
|
590 |
hdev->control = open("/dev/vhost-net", O_RDWR);
|
591 |
if (hdev->control < 0) { |
592 |
return -errno;
|
593 |
} |
594 |
} |
595 |
r = ioctl(hdev->control, VHOST_SET_OWNER, NULL);
|
596 |
if (r < 0) { |
597 |
goto fail;
|
598 |
} |
599 |
|
600 |
r = ioctl(hdev->control, VHOST_GET_FEATURES, &features); |
601 |
if (r < 0) { |
602 |
goto fail;
|
603 |
} |
604 |
hdev->features = features; |
605 |
|
606 |
hdev->client.set_memory = vhost_client_set_memory; |
607 |
hdev->client.sync_dirty_bitmap = vhost_client_sync_dirty_bitmap; |
608 |
hdev->client.migration_log = vhost_client_migration_log; |
609 |
hdev->mem = qemu_mallocz(offsetof(struct vhost_memory, regions));
|
610 |
hdev->log = NULL;
|
611 |
hdev->log_size = 0;
|
612 |
hdev->log_enabled = false;
|
613 |
hdev->started = false;
|
614 |
cpu_register_phys_memory_client(&hdev->client); |
615 |
return 0; |
616 |
fail:
|
617 |
r = -errno; |
618 |
close(hdev->control); |
619 |
return r;
|
620 |
} |
621 |
|
622 |
void vhost_dev_cleanup(struct vhost_dev *hdev) |
623 |
{ |
624 |
cpu_unregister_phys_memory_client(&hdev->client); |
625 |
qemu_free(hdev->mem); |
626 |
close(hdev->control); |
627 |
} |
628 |
|
629 |
int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev) |
630 |
{ |
631 |
int i, r;
|
632 |
if (!vdev->binding->set_guest_notifiers) {
|
633 |
fprintf(stderr, "binding does not support guest notifiers\n");
|
634 |
r = -ENOSYS; |
635 |
goto fail;
|
636 |
} |
637 |
|
638 |
r = vdev->binding->set_guest_notifiers(vdev->binding_opaque, true);
|
639 |
if (r < 0) { |
640 |
fprintf(stderr, "Error binding guest notifier: %d\n", -r);
|
641 |
goto fail_notifiers;
|
642 |
} |
643 |
|
644 |
r = vhost_dev_set_features(hdev, hdev->log_enabled); |
645 |
if (r < 0) { |
646 |
goto fail_features;
|
647 |
} |
648 |
r = ioctl(hdev->control, VHOST_SET_MEM_TABLE, hdev->mem); |
649 |
if (r < 0) { |
650 |
r = -errno; |
651 |
goto fail_mem;
|
652 |
} |
653 |
for (i = 0; i < hdev->nvqs; ++i) { |
654 |
r = vhost_virtqueue_init(hdev, |
655 |
vdev, |
656 |
hdev->vqs + i, |
657 |
i); |
658 |
if (r < 0) { |
659 |
goto fail_vq;
|
660 |
} |
661 |
} |
662 |
|
663 |
if (hdev->log_enabled) {
|
664 |
hdev->log_size = vhost_get_log_size(hdev); |
665 |
hdev->log = hdev->log_size ? |
666 |
qemu_mallocz(hdev->log_size * sizeof *hdev->log) : NULL; |
667 |
r = ioctl(hdev->control, VHOST_SET_LOG_BASE, |
668 |
(uint64_t)(unsigned long)hdev->log); |
669 |
if (r < 0) { |
670 |
r = -errno; |
671 |
goto fail_log;
|
672 |
} |
673 |
} |
674 |
|
675 |
hdev->started = true;
|
676 |
|
677 |
return 0; |
678 |
fail_log:
|
679 |
fail_vq:
|
680 |
while (--i >= 0) { |
681 |
vhost_virtqueue_cleanup(hdev, |
682 |
vdev, |
683 |
hdev->vqs + i, |
684 |
i); |
685 |
} |
686 |
fail_mem:
|
687 |
fail_features:
|
688 |
vdev->binding->set_guest_notifiers(vdev->binding_opaque, false);
|
689 |
fail_notifiers:
|
690 |
fail:
|
691 |
return r;
|
692 |
} |
693 |
|
694 |
void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev) |
695 |
{ |
696 |
int i, r;
|
697 |
|
698 |
for (i = 0; i < hdev->nvqs; ++i) { |
699 |
vhost_virtqueue_cleanup(hdev, |
700 |
vdev, |
701 |
hdev->vqs + i, |
702 |
i); |
703 |
} |
704 |
vhost_client_sync_dirty_bitmap(&hdev->client, 0,
|
705 |
(target_phys_addr_t)~0x0ull);
|
706 |
r = vdev->binding->set_guest_notifiers(vdev->binding_opaque, false);
|
707 |
if (r < 0) { |
708 |
fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
|
709 |
fflush(stderr); |
710 |
} |
711 |
assert (r >= 0);
|
712 |
|
713 |
hdev->started = false;
|
714 |
qemu_free(hdev->log); |
715 |
hdev->log_size = 0;
|
716 |
} |