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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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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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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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#include "exec-memory.h" |
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|
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static void vhost_dev_sync_region(struct vhost_dev *dev, |
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MemoryRegionSection *section, |
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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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if (end < start) {
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return;
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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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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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addr += VHOST_LOG_CHUNK; |
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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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ram_addr_t ram_addr; |
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bit -= 1;
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ram_addr = section->offset_within_region + bit * VHOST_LOG_PAGE; |
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memory_region_set_dirty(section->mr, ram_addr, 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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static int vhost_sync_dirty_bitmap(struct vhost_dev *dev, |
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MemoryRegionSection *section, |
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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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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, section, 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, section, 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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static void vhost_log_sync(MemoryListener *listener, |
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MemoryRegionSection *section) |
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{ |
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struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
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memory_listener); |
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target_phys_addr_t start_addr = section->offset_within_address_space; |
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target_phys_addr_t end_addr = start_addr + section->size; |
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vhost_sync_dirty_bitmap(dev, section, start_addr, end_addr); |
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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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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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/* 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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/* 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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/* 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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/* 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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++overlap_middle; |
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continue;
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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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/* 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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/* 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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/* 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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/* 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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prlast = range_get_last(reg->guest_phys_addr, reg->memory_size); |
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pmlast = range_get_last(start_addr, size); |
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urlast = range_get_last(reg->userspace_addr, reg->memory_size); |
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umlast = range_get_last(uaddr, size); |
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/* check for overlapping regions: should never happen. */
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assert(prlast < start_addr || pmlast < reg->guest_phys_addr); |
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/* 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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} |
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if (merged) {
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--to; |
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assert(to >= 0);
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} else {
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merged = reg; |
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} |
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u = MIN(uaddr, reg->userspace_addr); |
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s = MIN(start_addr, reg->guest_phys_addr); |
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e = MAX(pmlast, prlast); |
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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); |
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} |
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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); |
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reg->memory_size = size; |
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assert(reg->memory_size); |
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reg->guest_phys_addr = start_addr; |
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reg->userspace_addr = uaddr; |
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++to; |
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} |
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assert(to <= dev->mem->nregions + 1);
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dev->mem->nregions = to; |
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} |
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|
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static uint64_t vhost_get_log_size(struct vhost_dev *dev) |
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{ |
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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) { |
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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); |
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log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1);
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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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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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} |
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static inline void vhost_dev_log_resize(struct vhost_dev* dev, uint64_t size) |
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{ |
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vhost_log_chunk_t *log; |
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uint64_t log_base; |
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int r, i;
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if (size) {
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log = g_malloc0(size * sizeof *log);
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} else {
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log = NULL;
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} |
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log_base = (uint64_t)(unsigned long)log; |
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r = ioctl(dev->control, VHOST_SET_LOG_BASE, &log_base); |
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assert(r >= 0);
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for (i = 0; i < dev->n_mem_sections; ++i) { |
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/* Sync only the range covered by the old log */
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vhost_sync_dirty_bitmap(dev, &dev->mem_sections[i], 0,
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dev->log_size * VHOST_LOG_CHUNK - 1);
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} |
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if (dev->log) {
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g_free(dev->log); |
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} |
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dev->log = log; |
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dev->log_size = size; |
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} |
291 |
|
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static int vhost_verify_ring_mappings(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 i;
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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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target_phys_addr_t l; |
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void *p;
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|
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if (!ranges_overlap(start_addr, size, vq->ring_phys, vq->ring_size)) {
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continue;
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} |
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l = vq->ring_size; |
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p = cpu_physical_memory_map(vq->ring_phys, &l, 1);
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if (!p || l != vq->ring_size) {
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fprintf(stderr, "Unable to map ring buffer for ring %d\n", i);
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return -ENOMEM;
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} |
311 |
if (p != vq->ring) {
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fprintf(stderr, "Ring buffer relocated for ring %d\n", i);
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return -EBUSY;
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} |
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cpu_physical_memory_unmap(p, l, 0, 0); |
316 |
} |
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return 0; |
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} |
319 |
|
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static struct vhost_memory_region *vhost_dev_find_reg(struct vhost_dev *dev, |
321 |
uint64_t start_addr, |
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uint64_t size) |
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{ |
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int i, n = dev->mem->nregions;
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for (i = 0; i < n; ++i) { |
326 |
struct vhost_memory_region *reg = dev->mem->regions + i;
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if (ranges_overlap(reg->guest_phys_addr, reg->memory_size,
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start_addr, size)) { |
329 |
return reg;
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330 |
} |
331 |
} |
332 |
return NULL; |
333 |
} |
334 |
|
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static bool vhost_dev_cmp_memory(struct vhost_dev *dev, |
336 |
uint64_t start_addr, |
337 |
uint64_t size, |
338 |
uint64_t uaddr) |
339 |
{ |
340 |
struct vhost_memory_region *reg = vhost_dev_find_reg(dev, start_addr, size);
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341 |
uint64_t reglast; |
342 |
uint64_t memlast; |
343 |
|
344 |
if (!reg) {
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345 |
return true; |
346 |
} |
347 |
|
348 |
reglast = range_get_last(reg->guest_phys_addr, reg->memory_size); |
349 |
memlast = range_get_last(start_addr, size); |
350 |
|
351 |
/* Need to extend region? */
|
352 |
if (start_addr < reg->guest_phys_addr || memlast > reglast) {
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353 |
return true; |
354 |
} |
355 |
/* userspace_addr changed? */
|
356 |
return uaddr != reg->userspace_addr + start_addr - reg->guest_phys_addr;
|
357 |
} |
358 |
|
359 |
static void vhost_set_memory(MemoryListener *listener, |
360 |
MemoryRegionSection *section, |
361 |
bool add)
|
362 |
{ |
363 |
struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
364 |
memory_listener); |
365 |
target_phys_addr_t start_addr = section->offset_within_address_space; |
366 |
ram_addr_t size = section->size; |
367 |
bool log_dirty = memory_region_is_logging(section->mr);
|
368 |
int s = offsetof(struct vhost_memory, regions) + |
369 |
(dev->mem->nregions + 1) * sizeof dev->mem->regions[0]; |
370 |
uint64_t log_size; |
371 |
int r;
|
372 |
void *ram;
|
373 |
|
374 |
dev->mem = g_realloc(dev->mem, s); |
375 |
|
376 |
if (log_dirty) {
|
377 |
add = false;
|
378 |
} |
379 |
|
380 |
assert(size); |
381 |
|
382 |
/* Optimize no-change case. At least cirrus_vga does this a lot at this time. */
|
383 |
ram = memory_region_get_ram_ptr(section->mr) + section->offset_within_region; |
384 |
if (add) {
|
385 |
if (!vhost_dev_cmp_memory(dev, start_addr, size, (uintptr_t)ram)) {
|
386 |
/* Region exists with same address. Nothing to do. */
|
387 |
return;
|
388 |
} |
389 |
} else {
|
390 |
if (!vhost_dev_find_reg(dev, start_addr, size)) {
|
391 |
/* Removing region that we don't access. Nothing to do. */
|
392 |
return;
|
393 |
} |
394 |
} |
395 |
|
396 |
vhost_dev_unassign_memory(dev, start_addr, size); |
397 |
if (add) {
|
398 |
/* Add given mapping, merging adjacent regions if any */
|
399 |
vhost_dev_assign_memory(dev, start_addr, size, (uintptr_t)ram); |
400 |
} else {
|
401 |
/* Remove old mapping for this memory, if any. */
|
402 |
vhost_dev_unassign_memory(dev, start_addr, size); |
403 |
} |
404 |
|
405 |
if (!dev->started) {
|
406 |
return;
|
407 |
} |
408 |
|
409 |
if (dev->started) {
|
410 |
r = vhost_verify_ring_mappings(dev, start_addr, size); |
411 |
assert(r >= 0);
|
412 |
} |
413 |
|
414 |
if (!dev->log_enabled) {
|
415 |
r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem); |
416 |
assert(r >= 0);
|
417 |
return;
|
418 |
} |
419 |
log_size = vhost_get_log_size(dev); |
420 |
/* We allocate an extra 4K bytes to log,
|
421 |
* to reduce the * number of reallocations. */
|
422 |
#define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log) |
423 |
/* To log more, must increase log size before table update. */
|
424 |
if (dev->log_size < log_size) {
|
425 |
vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER); |
426 |
} |
427 |
r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem); |
428 |
assert(r >= 0);
|
429 |
/* To log less, can only decrease log size after table update. */
|
430 |
if (dev->log_size > log_size + VHOST_LOG_BUFFER) {
|
431 |
vhost_dev_log_resize(dev, log_size); |
432 |
} |
433 |
} |
434 |
|
435 |
static bool vhost_section(MemoryRegionSection *section) |
436 |
{ |
437 |
return section->address_space == get_system_memory()
|
438 |
&& memory_region_is_ram(section->mr); |
439 |
} |
440 |
|
441 |
static void vhost_begin(MemoryListener *listener) |
442 |
{ |
443 |
} |
444 |
|
445 |
static void vhost_commit(MemoryListener *listener) |
446 |
{ |
447 |
} |
448 |
|
449 |
static void vhost_region_add(MemoryListener *listener, |
450 |
MemoryRegionSection *section) |
451 |
{ |
452 |
struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
453 |
memory_listener); |
454 |
|
455 |
if (!vhost_section(section)) {
|
456 |
return;
|
457 |
} |
458 |
|
459 |
++dev->n_mem_sections; |
460 |
dev->mem_sections = g_renew(MemoryRegionSection, dev->mem_sections, |
461 |
dev->n_mem_sections); |
462 |
dev->mem_sections[dev->n_mem_sections - 1] = *section;
|
463 |
vhost_set_memory(listener, section, true);
|
464 |
} |
465 |
|
466 |
static void vhost_region_del(MemoryListener *listener, |
467 |
MemoryRegionSection *section) |
468 |
{ |
469 |
struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
470 |
memory_listener); |
471 |
int i;
|
472 |
|
473 |
if (!vhost_section(section)) {
|
474 |
return;
|
475 |
} |
476 |
|
477 |
vhost_set_memory(listener, section, false);
|
478 |
for (i = 0; i < dev->n_mem_sections; ++i) { |
479 |
if (dev->mem_sections[i].offset_within_address_space
|
480 |
== section->offset_within_address_space) { |
481 |
--dev->n_mem_sections; |
482 |
memmove(&dev->mem_sections[i], &dev->mem_sections[i+1],
|
483 |
(dev->n_mem_sections - i) * sizeof(*dev->mem_sections));
|
484 |
break;
|
485 |
} |
486 |
} |
487 |
} |
488 |
|
489 |
static void vhost_region_nop(MemoryListener *listener, |
490 |
MemoryRegionSection *section) |
491 |
{ |
492 |
} |
493 |
|
494 |
static int vhost_virtqueue_set_addr(struct vhost_dev *dev, |
495 |
struct vhost_virtqueue *vq,
|
496 |
unsigned idx, bool enable_log) |
497 |
{ |
498 |
struct vhost_vring_addr addr = {
|
499 |
.index = idx, |
500 |
.desc_user_addr = (uint64_t)(unsigned long)vq->desc, |
501 |
.avail_user_addr = (uint64_t)(unsigned long)vq->avail, |
502 |
.used_user_addr = (uint64_t)(unsigned long)vq->used, |
503 |
.log_guest_addr = vq->used_phys, |
504 |
.flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0, |
505 |
}; |
506 |
int r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr);
|
507 |
if (r < 0) { |
508 |
return -errno;
|
509 |
} |
510 |
return 0; |
511 |
} |
512 |
|
513 |
static int vhost_dev_set_features(struct vhost_dev *dev, bool enable_log) |
514 |
{ |
515 |
uint64_t features = dev->acked_features; |
516 |
int r;
|
517 |
if (enable_log) {
|
518 |
features |= 0x1 << VHOST_F_LOG_ALL;
|
519 |
} |
520 |
r = ioctl(dev->control, VHOST_SET_FEATURES, &features); |
521 |
return r < 0 ? -errno : 0; |
522 |
} |
523 |
|
524 |
static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log) |
525 |
{ |
526 |
int r, t, i;
|
527 |
r = vhost_dev_set_features(dev, enable_log); |
528 |
if (r < 0) { |
529 |
goto err_features;
|
530 |
} |
531 |
for (i = 0; i < dev->nvqs; ++i) { |
532 |
r = vhost_virtqueue_set_addr(dev, dev->vqs + i, i, |
533 |
enable_log); |
534 |
if (r < 0) { |
535 |
goto err_vq;
|
536 |
} |
537 |
} |
538 |
return 0; |
539 |
err_vq:
|
540 |
for (; i >= 0; --i) { |
541 |
t = vhost_virtqueue_set_addr(dev, dev->vqs + i, i, |
542 |
dev->log_enabled); |
543 |
assert(t >= 0);
|
544 |
} |
545 |
t = vhost_dev_set_features(dev, dev->log_enabled); |
546 |
assert(t >= 0);
|
547 |
err_features:
|
548 |
return r;
|
549 |
} |
550 |
|
551 |
static int vhost_migration_log(MemoryListener *listener, int enable) |
552 |
{ |
553 |
struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
554 |
memory_listener); |
555 |
int r;
|
556 |
if (!!enable == dev->log_enabled) {
|
557 |
return 0; |
558 |
} |
559 |
if (!dev->started) {
|
560 |
dev->log_enabled = enable; |
561 |
return 0; |
562 |
} |
563 |
if (!enable) {
|
564 |
r = vhost_dev_set_log(dev, false);
|
565 |
if (r < 0) { |
566 |
return r;
|
567 |
} |
568 |
if (dev->log) {
|
569 |
g_free(dev->log); |
570 |
} |
571 |
dev->log = NULL;
|
572 |
dev->log_size = 0;
|
573 |
} else {
|
574 |
vhost_dev_log_resize(dev, vhost_get_log_size(dev)); |
575 |
r = vhost_dev_set_log(dev, true);
|
576 |
if (r < 0) { |
577 |
return r;
|
578 |
} |
579 |
} |
580 |
dev->log_enabled = enable; |
581 |
return 0; |
582 |
} |
583 |
|
584 |
static void vhost_log_global_start(MemoryListener *listener) |
585 |
{ |
586 |
int r;
|
587 |
|
588 |
r = vhost_migration_log(listener, true);
|
589 |
if (r < 0) { |
590 |
abort(); |
591 |
} |
592 |
} |
593 |
|
594 |
static void vhost_log_global_stop(MemoryListener *listener) |
595 |
{ |
596 |
int r;
|
597 |
|
598 |
r = vhost_migration_log(listener, false);
|
599 |
if (r < 0) { |
600 |
abort(); |
601 |
} |
602 |
} |
603 |
|
604 |
static void vhost_log_start(MemoryListener *listener, |
605 |
MemoryRegionSection *section) |
606 |
{ |
607 |
/* FIXME: implement */
|
608 |
} |
609 |
|
610 |
static void vhost_log_stop(MemoryListener *listener, |
611 |
MemoryRegionSection *section) |
612 |
{ |
613 |
/* FIXME: implement */
|
614 |
} |
615 |
|
616 |
static int vhost_virtqueue_init(struct vhost_dev *dev, |
617 |
struct VirtIODevice *vdev,
|
618 |
struct vhost_virtqueue *vq,
|
619 |
unsigned idx)
|
620 |
{ |
621 |
target_phys_addr_t s, l, a; |
622 |
int r;
|
623 |
struct vhost_vring_file file = {
|
624 |
.index = idx, |
625 |
}; |
626 |
struct vhost_vring_state state = {
|
627 |
.index = idx, |
628 |
}; |
629 |
struct VirtQueue *vvq = virtio_get_queue(vdev, idx);
|
630 |
|
631 |
vq->num = state.num = virtio_queue_get_num(vdev, idx); |
632 |
r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state); |
633 |
if (r) {
|
634 |
return -errno;
|
635 |
} |
636 |
|
637 |
state.num = virtio_queue_get_last_avail_idx(vdev, idx); |
638 |
r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state); |
639 |
if (r) {
|
640 |
return -errno;
|
641 |
} |
642 |
|
643 |
s = l = virtio_queue_get_desc_size(vdev, idx); |
644 |
a = virtio_queue_get_desc_addr(vdev, idx); |
645 |
vq->desc = cpu_physical_memory_map(a, &l, 0);
|
646 |
if (!vq->desc || l != s) {
|
647 |
r = -ENOMEM; |
648 |
goto fail_alloc_desc;
|
649 |
} |
650 |
s = l = virtio_queue_get_avail_size(vdev, idx); |
651 |
a = virtio_queue_get_avail_addr(vdev, idx); |
652 |
vq->avail = cpu_physical_memory_map(a, &l, 0);
|
653 |
if (!vq->avail || l != s) {
|
654 |
r = -ENOMEM; |
655 |
goto fail_alloc_avail;
|
656 |
} |
657 |
vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx); |
658 |
vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx); |
659 |
vq->used = cpu_physical_memory_map(a, &l, 1);
|
660 |
if (!vq->used || l != s) {
|
661 |
r = -ENOMEM; |
662 |
goto fail_alloc_used;
|
663 |
} |
664 |
|
665 |
vq->ring_size = s = l = virtio_queue_get_ring_size(vdev, idx); |
666 |
vq->ring_phys = a = virtio_queue_get_ring_addr(vdev, idx); |
667 |
vq->ring = cpu_physical_memory_map(a, &l, 1);
|
668 |
if (!vq->ring || l != s) {
|
669 |
r = -ENOMEM; |
670 |
goto fail_alloc_ring;
|
671 |
} |
672 |
|
673 |
r = vhost_virtqueue_set_addr(dev, vq, idx, dev->log_enabled); |
674 |
if (r < 0) { |
675 |
r = -errno; |
676 |
goto fail_alloc;
|
677 |
} |
678 |
file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq)); |
679 |
r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file); |
680 |
if (r) {
|
681 |
r = -errno; |
682 |
goto fail_kick;
|
683 |
} |
684 |
|
685 |
file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq)); |
686 |
r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file); |
687 |
if (r) {
|
688 |
r = -errno; |
689 |
goto fail_call;
|
690 |
} |
691 |
|
692 |
return 0; |
693 |
|
694 |
fail_call:
|
695 |
fail_kick:
|
696 |
fail_alloc:
|
697 |
cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx), |
698 |
0, 0); |
699 |
fail_alloc_ring:
|
700 |
cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx), |
701 |
0, 0); |
702 |
fail_alloc_used:
|
703 |
cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx), |
704 |
0, 0); |
705 |
fail_alloc_avail:
|
706 |
cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx), |
707 |
0, 0); |
708 |
fail_alloc_desc:
|
709 |
return r;
|
710 |
} |
711 |
|
712 |
static void vhost_virtqueue_cleanup(struct vhost_dev *dev, |
713 |
struct VirtIODevice *vdev,
|
714 |
struct vhost_virtqueue *vq,
|
715 |
unsigned idx)
|
716 |
{ |
717 |
struct vhost_vring_state state = {
|
718 |
.index = idx, |
719 |
}; |
720 |
int r;
|
721 |
r = ioctl(dev->control, VHOST_GET_VRING_BASE, &state); |
722 |
if (r < 0) { |
723 |
fprintf(stderr, "vhost VQ %d ring restore failed: %d\n", idx, r);
|
724 |
fflush(stderr); |
725 |
} |
726 |
virtio_queue_set_last_avail_idx(vdev, idx, state.num); |
727 |
assert (r >= 0);
|
728 |
cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx), |
729 |
0, virtio_queue_get_ring_size(vdev, idx));
|
730 |
cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx), |
731 |
1, virtio_queue_get_used_size(vdev, idx));
|
732 |
cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx), |
733 |
0, virtio_queue_get_avail_size(vdev, idx));
|
734 |
cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx), |
735 |
0, virtio_queue_get_desc_size(vdev, idx));
|
736 |
} |
737 |
|
738 |
static void vhost_eventfd_add(MemoryListener *listener, |
739 |
MemoryRegionSection *section, |
740 |
bool match_data, uint64_t data, int fd) |
741 |
{ |
742 |
} |
743 |
|
744 |
static void vhost_eventfd_del(MemoryListener *listener, |
745 |
MemoryRegionSection *section, |
746 |
bool match_data, uint64_t data, int fd) |
747 |
{ |
748 |
} |
749 |
|
750 |
int vhost_dev_init(struct vhost_dev *hdev, int devfd, bool force) |
751 |
{ |
752 |
uint64_t features; |
753 |
int r;
|
754 |
if (devfd >= 0) { |
755 |
hdev->control = devfd; |
756 |
} else {
|
757 |
hdev->control = open("/dev/vhost-net", O_RDWR);
|
758 |
if (hdev->control < 0) { |
759 |
return -errno;
|
760 |
} |
761 |
} |
762 |
r = ioctl(hdev->control, VHOST_SET_OWNER, NULL);
|
763 |
if (r < 0) { |
764 |
goto fail;
|
765 |
} |
766 |
|
767 |
r = ioctl(hdev->control, VHOST_GET_FEATURES, &features); |
768 |
if (r < 0) { |
769 |
goto fail;
|
770 |
} |
771 |
hdev->features = features; |
772 |
|
773 |
hdev->memory_listener = (MemoryListener) { |
774 |
.begin = vhost_begin, |
775 |
.commit = vhost_commit, |
776 |
.region_add = vhost_region_add, |
777 |
.region_del = vhost_region_del, |
778 |
.region_nop = vhost_region_nop, |
779 |
.log_start = vhost_log_start, |
780 |
.log_stop = vhost_log_stop, |
781 |
.log_sync = vhost_log_sync, |
782 |
.log_global_start = vhost_log_global_start, |
783 |
.log_global_stop = vhost_log_global_stop, |
784 |
.eventfd_add = vhost_eventfd_add, |
785 |
.eventfd_del = vhost_eventfd_del, |
786 |
.priority = 10
|
787 |
}; |
788 |
hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions));
|
789 |
hdev->n_mem_sections = 0;
|
790 |
hdev->mem_sections = NULL;
|
791 |
hdev->log = NULL;
|
792 |
hdev->log_size = 0;
|
793 |
hdev->log_enabled = false;
|
794 |
hdev->started = false;
|
795 |
memory_listener_register(&hdev->memory_listener, NULL);
|
796 |
hdev->force = force; |
797 |
return 0; |
798 |
fail:
|
799 |
r = -errno; |
800 |
close(hdev->control); |
801 |
return r;
|
802 |
} |
803 |
|
804 |
void vhost_dev_cleanup(struct vhost_dev *hdev) |
805 |
{ |
806 |
memory_listener_unregister(&hdev->memory_listener); |
807 |
g_free(hdev->mem); |
808 |
g_free(hdev->mem_sections); |
809 |
close(hdev->control); |
810 |
} |
811 |
|
812 |
bool vhost_dev_query(struct vhost_dev *hdev, VirtIODevice *vdev) |
813 |
{ |
814 |
return !vdev->binding->query_guest_notifiers ||
|
815 |
vdev->binding->query_guest_notifiers(vdev->binding_opaque) || |
816 |
hdev->force; |
817 |
} |
818 |
|
819 |
/* Stop processing guest IO notifications in qemu.
|
820 |
* Start processing them in vhost in kernel.
|
821 |
*/
|
822 |
int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) |
823 |
{ |
824 |
int i, r;
|
825 |
if (!vdev->binding->set_host_notifier) {
|
826 |
fprintf(stderr, "binding does not support host notifiers\n");
|
827 |
r = -ENOSYS; |
828 |
goto fail;
|
829 |
} |
830 |
|
831 |
for (i = 0; i < hdev->nvqs; ++i) { |
832 |
r = vdev->binding->set_host_notifier(vdev->binding_opaque, i, true);
|
833 |
if (r < 0) { |
834 |
fprintf(stderr, "vhost VQ %d notifier binding failed: %d\n", i, -r);
|
835 |
goto fail_vq;
|
836 |
} |
837 |
} |
838 |
|
839 |
return 0; |
840 |
fail_vq:
|
841 |
while (--i >= 0) { |
842 |
r = vdev->binding->set_host_notifier(vdev->binding_opaque, i, false);
|
843 |
if (r < 0) { |
844 |
fprintf(stderr, "vhost VQ %d notifier cleanup error: %d\n", i, -r);
|
845 |
fflush(stderr); |
846 |
} |
847 |
assert (r >= 0);
|
848 |
} |
849 |
fail:
|
850 |
return r;
|
851 |
} |
852 |
|
853 |
/* Stop processing guest IO notifications in vhost.
|
854 |
* Start processing them in qemu.
|
855 |
* This might actually run the qemu handlers right away,
|
856 |
* so virtio in qemu must be completely setup when this is called.
|
857 |
*/
|
858 |
void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) |
859 |
{ |
860 |
int i, r;
|
861 |
|
862 |
for (i = 0; i < hdev->nvqs; ++i) { |
863 |
r = vdev->binding->set_host_notifier(vdev->binding_opaque, i, false);
|
864 |
if (r < 0) { |
865 |
fprintf(stderr, "vhost VQ %d notifier cleanup failed: %d\n", i, -r);
|
866 |
fflush(stderr); |
867 |
} |
868 |
assert (r >= 0);
|
869 |
} |
870 |
} |
871 |
|
872 |
/* Host notifiers must be enabled at this point. */
|
873 |
int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev) |
874 |
{ |
875 |
int i, r;
|
876 |
if (!vdev->binding->set_guest_notifiers) {
|
877 |
fprintf(stderr, "binding does not support guest notifiers\n");
|
878 |
r = -ENOSYS; |
879 |
goto fail;
|
880 |
} |
881 |
|
882 |
r = vdev->binding->set_guest_notifiers(vdev->binding_opaque, true);
|
883 |
if (r < 0) { |
884 |
fprintf(stderr, "Error binding guest notifier: %d\n", -r);
|
885 |
goto fail_notifiers;
|
886 |
} |
887 |
|
888 |
r = vhost_dev_set_features(hdev, hdev->log_enabled); |
889 |
if (r < 0) { |
890 |
goto fail_features;
|
891 |
} |
892 |
r = ioctl(hdev->control, VHOST_SET_MEM_TABLE, hdev->mem); |
893 |
if (r < 0) { |
894 |
r = -errno; |
895 |
goto fail_mem;
|
896 |
} |
897 |
for (i = 0; i < hdev->nvqs; ++i) { |
898 |
r = vhost_virtqueue_init(hdev, |
899 |
vdev, |
900 |
hdev->vqs + i, |
901 |
i); |
902 |
if (r < 0) { |
903 |
goto fail_vq;
|
904 |
} |
905 |
} |
906 |
|
907 |
if (hdev->log_enabled) {
|
908 |
hdev->log_size = vhost_get_log_size(hdev); |
909 |
hdev->log = hdev->log_size ? |
910 |
g_malloc0(hdev->log_size * sizeof *hdev->log) : NULL; |
911 |
r = ioctl(hdev->control, VHOST_SET_LOG_BASE, |
912 |
(uint64_t)(unsigned long)hdev->log); |
913 |
if (r < 0) { |
914 |
r = -errno; |
915 |
goto fail_log;
|
916 |
} |
917 |
} |
918 |
|
919 |
hdev->started = true;
|
920 |
|
921 |
return 0; |
922 |
fail_log:
|
923 |
fail_vq:
|
924 |
while (--i >= 0) { |
925 |
vhost_virtqueue_cleanup(hdev, |
926 |
vdev, |
927 |
hdev->vqs + i, |
928 |
i); |
929 |
} |
930 |
fail_mem:
|
931 |
fail_features:
|
932 |
vdev->binding->set_guest_notifiers(vdev->binding_opaque, false);
|
933 |
fail_notifiers:
|
934 |
fail:
|
935 |
return r;
|
936 |
} |
937 |
|
938 |
/* Host notifiers must be enabled at this point. */
|
939 |
void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev) |
940 |
{ |
941 |
int i, r;
|
942 |
|
943 |
for (i = 0; i < hdev->nvqs; ++i) { |
944 |
vhost_virtqueue_cleanup(hdev, |
945 |
vdev, |
946 |
hdev->vqs + i, |
947 |
i); |
948 |
} |
949 |
for (i = 0; i < hdev->n_mem_sections; ++i) { |
950 |
vhost_sync_dirty_bitmap(hdev, &hdev->mem_sections[i], |
951 |
0, (target_phys_addr_t)~0x0ull); |
952 |
} |
953 |
r = vdev->binding->set_guest_notifiers(vdev->binding_opaque, false);
|
954 |
if (r < 0) { |
955 |
fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
|
956 |
fflush(stderr); |
957 |
} |
958 |
assert (r >= 0);
|
959 |
|
960 |
hdev->started = false;
|
961 |
g_free(hdev->log); |
962 |
hdev->log = NULL;
|
963 |
hdev->log_size = 0;
|
964 |
} |