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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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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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|
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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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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); |
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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_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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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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vhost_sync_dirty_bitmap(dev, &dev->mem_sections[i], |
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0, (target_phys_addr_t)~0x0ull); |
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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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} |
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|
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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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} |
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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); |
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} |
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return 0; |
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} |
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|
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static struct vhost_memory_region *vhost_dev_find_reg(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, n = dev->mem->nregions;
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for (i = 0; i < n; ++i) { |
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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)) { |
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return reg;
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} |
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} |
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return NULL; |
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} |
328 |
|
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static bool vhost_dev_cmp_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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struct vhost_memory_region *reg = vhost_dev_find_reg(dev, start_addr, size);
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uint64_t reglast; |
336 |
uint64_t memlast; |
337 |
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if (!reg) {
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return true; |
340 |
} |
341 |
|
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reglast = range_get_last(reg->guest_phys_addr, reg->memory_size); |
343 |
memlast = range_get_last(start_addr, size); |
344 |
|
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/* Need to extend region? */
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if (start_addr < reg->guest_phys_addr || memlast > reglast) {
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return true; |
348 |
} |
349 |
/* userspace_addr changed? */
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return uaddr != reg->userspace_addr + start_addr - reg->guest_phys_addr;
|
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} |
352 |
|
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static void vhost_set_memory(MemoryListener *listener, |
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MemoryRegionSection *section, |
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bool add)
|
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{ |
357 |
struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
358 |
memory_listener); |
359 |
target_phys_addr_t start_addr = section->offset_within_address_space; |
360 |
ram_addr_t size = section->size; |
361 |
bool log_dirty = memory_region_is_logging(section->mr);
|
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int s = offsetof(struct vhost_memory, regions) + |
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(dev->mem->nregions + 1) * sizeof dev->mem->regions[0]; |
364 |
uint64_t log_size; |
365 |
int r;
|
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void *ram;
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367 |
|
368 |
if (!memory_region_is_ram(section->mr)) {
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return;
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370 |
} |
371 |
|
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dev->mem = g_realloc(dev->mem, s); |
373 |
|
374 |
if (log_dirty) {
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375 |
add = false;
|
376 |
} |
377 |
|
378 |
assert(size); |
379 |
|
380 |
/* Optimize no-change case. At least cirrus_vga does this a lot at this time. */
|
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ram = memory_region_get_ram_ptr(section->mr); |
382 |
if (add) {
|
383 |
if (!vhost_dev_cmp_memory(dev, start_addr, size, (uintptr_t)ram)) {
|
384 |
/* Region exists with same address. Nothing to do. */
|
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return;
|
386 |
} |
387 |
} else {
|
388 |
if (!vhost_dev_find_reg(dev, start_addr, size)) {
|
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/* Removing region that we don't access. Nothing to do. */
|
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return;
|
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} |
392 |
} |
393 |
|
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vhost_dev_unassign_memory(dev, start_addr, size); |
395 |
if (add) {
|
396 |
/* Add given mapping, merging adjacent regions if any */
|
397 |
vhost_dev_assign_memory(dev, start_addr, size, (uintptr_t)ram); |
398 |
} else {
|
399 |
/* Remove old mapping for this memory, if any. */
|
400 |
vhost_dev_unassign_memory(dev, start_addr, size); |
401 |
} |
402 |
|
403 |
if (!dev->started) {
|
404 |
return;
|
405 |
} |
406 |
|
407 |
if (dev->started) {
|
408 |
r = vhost_verify_ring_mappings(dev, start_addr, size); |
409 |
assert(r >= 0);
|
410 |
} |
411 |
|
412 |
if (!dev->log_enabled) {
|
413 |
r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem); |
414 |
assert(r >= 0);
|
415 |
return;
|
416 |
} |
417 |
log_size = vhost_get_log_size(dev); |
418 |
/* We allocate an extra 4K bytes to log,
|
419 |
* to reduce the * number of reallocations. */
|
420 |
#define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log) |
421 |
/* To log more, must increase log size before table update. */
|
422 |
if (dev->log_size < log_size) {
|
423 |
vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER); |
424 |
} |
425 |
r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem); |
426 |
assert(r >= 0);
|
427 |
/* To log less, can only decrease log size after table update. */
|
428 |
if (dev->log_size > log_size + VHOST_LOG_BUFFER) {
|
429 |
vhost_dev_log_resize(dev, log_size); |
430 |
} |
431 |
} |
432 |
|
433 |
static void vhost_region_add(MemoryListener *listener, |
434 |
MemoryRegionSection *section) |
435 |
{ |
436 |
struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
437 |
memory_listener); |
438 |
|
439 |
++dev->n_mem_sections; |
440 |
dev->mem_sections = g_renew(MemoryRegionSection, dev->mem_sections, |
441 |
dev->n_mem_sections); |
442 |
dev->mem_sections[dev->n_mem_sections - 1] = *section;
|
443 |
vhost_set_memory(listener, section, true);
|
444 |
} |
445 |
|
446 |
static void vhost_region_del(MemoryListener *listener, |
447 |
MemoryRegionSection *section) |
448 |
{ |
449 |
struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
450 |
memory_listener); |
451 |
int i;
|
452 |
|
453 |
vhost_set_memory(listener, section, false);
|
454 |
for (i = 0; i < dev->n_mem_sections; ++i) { |
455 |
if (dev->mem_sections[i].offset_within_address_space
|
456 |
== section->offset_within_address_space) { |
457 |
--dev->n_mem_sections; |
458 |
memmove(&dev->mem_sections[i], &dev->mem_sections[i+1],
|
459 |
dev->n_mem_sections - i); |
460 |
break;
|
461 |
} |
462 |
} |
463 |
} |
464 |
|
465 |
static int vhost_virtqueue_set_addr(struct vhost_dev *dev, |
466 |
struct vhost_virtqueue *vq,
|
467 |
unsigned idx, bool enable_log) |
468 |
{ |
469 |
struct vhost_vring_addr addr = {
|
470 |
.index = idx, |
471 |
.desc_user_addr = (uint64_t)(unsigned long)vq->desc, |
472 |
.avail_user_addr = (uint64_t)(unsigned long)vq->avail, |
473 |
.used_user_addr = (uint64_t)(unsigned long)vq->used, |
474 |
.log_guest_addr = vq->used_phys, |
475 |
.flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0, |
476 |
}; |
477 |
int r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr);
|
478 |
if (r < 0) { |
479 |
return -errno;
|
480 |
} |
481 |
return 0; |
482 |
} |
483 |
|
484 |
static int vhost_dev_set_features(struct vhost_dev *dev, bool enable_log) |
485 |
{ |
486 |
uint64_t features = dev->acked_features; |
487 |
int r;
|
488 |
if (enable_log) {
|
489 |
features |= 0x1 << VHOST_F_LOG_ALL;
|
490 |
} |
491 |
r = ioctl(dev->control, VHOST_SET_FEATURES, &features); |
492 |
return r < 0 ? -errno : 0; |
493 |
} |
494 |
|
495 |
static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log) |
496 |
{ |
497 |
int r, t, i;
|
498 |
r = vhost_dev_set_features(dev, enable_log); |
499 |
if (r < 0) { |
500 |
goto err_features;
|
501 |
} |
502 |
for (i = 0; i < dev->nvqs; ++i) { |
503 |
r = vhost_virtqueue_set_addr(dev, dev->vqs + i, i, |
504 |
enable_log); |
505 |
if (r < 0) { |
506 |
goto err_vq;
|
507 |
} |
508 |
} |
509 |
return 0; |
510 |
err_vq:
|
511 |
for (; i >= 0; --i) { |
512 |
t = vhost_virtqueue_set_addr(dev, dev->vqs + i, i, |
513 |
dev->log_enabled); |
514 |
assert(t >= 0);
|
515 |
} |
516 |
t = vhost_dev_set_features(dev, dev->log_enabled); |
517 |
assert(t >= 0);
|
518 |
err_features:
|
519 |
return r;
|
520 |
} |
521 |
|
522 |
static int vhost_migration_log(MemoryListener *listener, int enable) |
523 |
{ |
524 |
struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
525 |
memory_listener); |
526 |
int r;
|
527 |
if (!!enable == dev->log_enabled) {
|
528 |
return 0; |
529 |
} |
530 |
if (!dev->started) {
|
531 |
dev->log_enabled = enable; |
532 |
return 0; |
533 |
} |
534 |
if (!enable) {
|
535 |
r = vhost_dev_set_log(dev, false);
|
536 |
if (r < 0) { |
537 |
return r;
|
538 |
} |
539 |
if (dev->log) {
|
540 |
g_free(dev->log); |
541 |
} |
542 |
dev->log = NULL;
|
543 |
dev->log_size = 0;
|
544 |
} else {
|
545 |
vhost_dev_log_resize(dev, vhost_get_log_size(dev)); |
546 |
r = vhost_dev_set_log(dev, true);
|
547 |
if (r < 0) { |
548 |
return r;
|
549 |
} |
550 |
} |
551 |
dev->log_enabled = enable; |
552 |
return 0; |
553 |
} |
554 |
|
555 |
static void vhost_log_global_start(MemoryListener *listener) |
556 |
{ |
557 |
int r;
|
558 |
|
559 |
r = vhost_migration_log(listener, true);
|
560 |
if (r < 0) { |
561 |
abort(); |
562 |
} |
563 |
} |
564 |
|
565 |
static void vhost_log_global_stop(MemoryListener *listener) |
566 |
{ |
567 |
int r;
|
568 |
|
569 |
r = vhost_migration_log(listener, false);
|
570 |
if (r < 0) { |
571 |
abort(); |
572 |
} |
573 |
} |
574 |
|
575 |
static void vhost_log_start(MemoryListener *listener, |
576 |
MemoryRegionSection *section) |
577 |
{ |
578 |
/* FIXME: implement */
|
579 |
} |
580 |
|
581 |
static void vhost_log_stop(MemoryListener *listener, |
582 |
MemoryRegionSection *section) |
583 |
{ |
584 |
/* FIXME: implement */
|
585 |
} |
586 |
|
587 |
static int vhost_virtqueue_init(struct vhost_dev *dev, |
588 |
struct VirtIODevice *vdev,
|
589 |
struct vhost_virtqueue *vq,
|
590 |
unsigned idx)
|
591 |
{ |
592 |
target_phys_addr_t s, l, a; |
593 |
int r;
|
594 |
struct vhost_vring_file file = {
|
595 |
.index = idx, |
596 |
}; |
597 |
struct vhost_vring_state state = {
|
598 |
.index = idx, |
599 |
}; |
600 |
struct VirtQueue *vvq = virtio_get_queue(vdev, idx);
|
601 |
|
602 |
vq->num = state.num = virtio_queue_get_num(vdev, idx); |
603 |
r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state); |
604 |
if (r) {
|
605 |
return -errno;
|
606 |
} |
607 |
|
608 |
state.num = virtio_queue_get_last_avail_idx(vdev, idx); |
609 |
r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state); |
610 |
if (r) {
|
611 |
return -errno;
|
612 |
} |
613 |
|
614 |
s = l = virtio_queue_get_desc_size(vdev, idx); |
615 |
a = virtio_queue_get_desc_addr(vdev, idx); |
616 |
vq->desc = cpu_physical_memory_map(a, &l, 0);
|
617 |
if (!vq->desc || l != s) {
|
618 |
r = -ENOMEM; |
619 |
goto fail_alloc_desc;
|
620 |
} |
621 |
s = l = virtio_queue_get_avail_size(vdev, idx); |
622 |
a = virtio_queue_get_avail_addr(vdev, idx); |
623 |
vq->avail = cpu_physical_memory_map(a, &l, 0);
|
624 |
if (!vq->avail || l != s) {
|
625 |
r = -ENOMEM; |
626 |
goto fail_alloc_avail;
|
627 |
} |
628 |
vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx); |
629 |
vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx); |
630 |
vq->used = cpu_physical_memory_map(a, &l, 1);
|
631 |
if (!vq->used || l != s) {
|
632 |
r = -ENOMEM; |
633 |
goto fail_alloc_used;
|
634 |
} |
635 |
|
636 |
vq->ring_size = s = l = virtio_queue_get_ring_size(vdev, idx); |
637 |
vq->ring_phys = a = virtio_queue_get_ring_addr(vdev, idx); |
638 |
vq->ring = cpu_physical_memory_map(a, &l, 1);
|
639 |
if (!vq->ring || l != s) {
|
640 |
r = -ENOMEM; |
641 |
goto fail_alloc_ring;
|
642 |
} |
643 |
|
644 |
r = vhost_virtqueue_set_addr(dev, vq, idx, dev->log_enabled); |
645 |
if (r < 0) { |
646 |
r = -errno; |
647 |
goto fail_alloc;
|
648 |
} |
649 |
file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq)); |
650 |
r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file); |
651 |
if (r) {
|
652 |
r = -errno; |
653 |
goto fail_kick;
|
654 |
} |
655 |
|
656 |
file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq)); |
657 |
r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file); |
658 |
if (r) {
|
659 |
r = -errno; |
660 |
goto fail_call;
|
661 |
} |
662 |
|
663 |
return 0; |
664 |
|
665 |
fail_call:
|
666 |
fail_kick:
|
667 |
fail_alloc:
|
668 |
cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx), |
669 |
0, 0); |
670 |
fail_alloc_ring:
|
671 |
cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx), |
672 |
0, 0); |
673 |
fail_alloc_used:
|
674 |
cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx), |
675 |
0, 0); |
676 |
fail_alloc_avail:
|
677 |
cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx), |
678 |
0, 0); |
679 |
fail_alloc_desc:
|
680 |
return r;
|
681 |
} |
682 |
|
683 |
static void vhost_virtqueue_cleanup(struct vhost_dev *dev, |
684 |
struct VirtIODevice *vdev,
|
685 |
struct vhost_virtqueue *vq,
|
686 |
unsigned idx)
|
687 |
{ |
688 |
struct vhost_vring_state state = {
|
689 |
.index = idx, |
690 |
}; |
691 |
int r;
|
692 |
r = ioctl(dev->control, VHOST_GET_VRING_BASE, &state); |
693 |
if (r < 0) { |
694 |
fprintf(stderr, "vhost VQ %d ring restore failed: %d\n", idx, r);
|
695 |
fflush(stderr); |
696 |
} |
697 |
virtio_queue_set_last_avail_idx(vdev, idx, state.num); |
698 |
assert (r >= 0);
|
699 |
cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx), |
700 |
0, virtio_queue_get_ring_size(vdev, idx));
|
701 |
cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx), |
702 |
1, virtio_queue_get_used_size(vdev, idx));
|
703 |
cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx), |
704 |
0, virtio_queue_get_avail_size(vdev, idx));
|
705 |
cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx), |
706 |
0, virtio_queue_get_desc_size(vdev, idx));
|
707 |
} |
708 |
|
709 |
int vhost_dev_init(struct vhost_dev *hdev, int devfd, bool force) |
710 |
{ |
711 |
uint64_t features; |
712 |
int r;
|
713 |
if (devfd >= 0) { |
714 |
hdev->control = devfd; |
715 |
} else {
|
716 |
hdev->control = open("/dev/vhost-net", O_RDWR);
|
717 |
if (hdev->control < 0) { |
718 |
return -errno;
|
719 |
} |
720 |
} |
721 |
r = ioctl(hdev->control, VHOST_SET_OWNER, NULL);
|
722 |
if (r < 0) { |
723 |
goto fail;
|
724 |
} |
725 |
|
726 |
r = ioctl(hdev->control, VHOST_GET_FEATURES, &features); |
727 |
if (r < 0) { |
728 |
goto fail;
|
729 |
} |
730 |
hdev->features = features; |
731 |
|
732 |
hdev->memory_listener = (MemoryListener) { |
733 |
.region_add = vhost_region_add, |
734 |
.region_del = vhost_region_del, |
735 |
.log_start = vhost_log_start, |
736 |
.log_stop = vhost_log_stop, |
737 |
.log_sync = vhost_log_sync, |
738 |
.log_global_start = vhost_log_global_start, |
739 |
.log_global_stop = vhost_log_global_stop, |
740 |
}; |
741 |
hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions));
|
742 |
hdev->n_mem_sections = 0;
|
743 |
hdev->mem_sections = NULL;
|
744 |
hdev->log = NULL;
|
745 |
hdev->log_size = 0;
|
746 |
hdev->log_enabled = false;
|
747 |
hdev->started = false;
|
748 |
memory_listener_register(&hdev->memory_listener); |
749 |
hdev->force = force; |
750 |
return 0; |
751 |
fail:
|
752 |
r = -errno; |
753 |
close(hdev->control); |
754 |
return r;
|
755 |
} |
756 |
|
757 |
void vhost_dev_cleanup(struct vhost_dev *hdev) |
758 |
{ |
759 |
memory_listener_unregister(&hdev->memory_listener); |
760 |
g_free(hdev->mem); |
761 |
g_free(hdev->mem_sections); |
762 |
close(hdev->control); |
763 |
} |
764 |
|
765 |
bool vhost_dev_query(struct vhost_dev *hdev, VirtIODevice *vdev) |
766 |
{ |
767 |
return !vdev->binding->query_guest_notifiers ||
|
768 |
vdev->binding->query_guest_notifiers(vdev->binding_opaque) || |
769 |
hdev->force; |
770 |
} |
771 |
|
772 |
/* Stop processing guest IO notifications in qemu.
|
773 |
* Start processing them in vhost in kernel.
|
774 |
*/
|
775 |
int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) |
776 |
{ |
777 |
int i, r;
|
778 |
if (!vdev->binding->set_host_notifier) {
|
779 |
fprintf(stderr, "binding does not support host notifiers\n");
|
780 |
r = -ENOSYS; |
781 |
goto fail;
|
782 |
} |
783 |
|
784 |
for (i = 0; i < hdev->nvqs; ++i) { |
785 |
r = vdev->binding->set_host_notifier(vdev->binding_opaque, i, true);
|
786 |
if (r < 0) { |
787 |
fprintf(stderr, "vhost VQ %d notifier binding failed: %d\n", i, -r);
|
788 |
goto fail_vq;
|
789 |
} |
790 |
} |
791 |
|
792 |
return 0; |
793 |
fail_vq:
|
794 |
while (--i >= 0) { |
795 |
r = vdev->binding->set_host_notifier(vdev->binding_opaque, i, false);
|
796 |
if (r < 0) { |
797 |
fprintf(stderr, "vhost VQ %d notifier cleanup error: %d\n", i, -r);
|
798 |
fflush(stderr); |
799 |
} |
800 |
assert (r >= 0);
|
801 |
} |
802 |
fail:
|
803 |
return r;
|
804 |
} |
805 |
|
806 |
/* Stop processing guest IO notifications in vhost.
|
807 |
* Start processing them in qemu.
|
808 |
* This might actually run the qemu handlers right away,
|
809 |
* so virtio in qemu must be completely setup when this is called.
|
810 |
*/
|
811 |
void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) |
812 |
{ |
813 |
int i, r;
|
814 |
|
815 |
for (i = 0; i < hdev->nvqs; ++i) { |
816 |
r = vdev->binding->set_host_notifier(vdev->binding_opaque, i, false);
|
817 |
if (r < 0) { |
818 |
fprintf(stderr, "vhost VQ %d notifier cleanup failed: %d\n", i, -r);
|
819 |
fflush(stderr); |
820 |
} |
821 |
assert (r >= 0);
|
822 |
} |
823 |
} |
824 |
|
825 |
/* Host notifiers must be enabled at this point. */
|
826 |
int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev) |
827 |
{ |
828 |
int i, r;
|
829 |
if (!vdev->binding->set_guest_notifiers) {
|
830 |
fprintf(stderr, "binding does not support guest notifiers\n");
|
831 |
r = -ENOSYS; |
832 |
goto fail;
|
833 |
} |
834 |
|
835 |
r = vdev->binding->set_guest_notifiers(vdev->binding_opaque, true);
|
836 |
if (r < 0) { |
837 |
fprintf(stderr, "Error binding guest notifier: %d\n", -r);
|
838 |
goto fail_notifiers;
|
839 |
} |
840 |
|
841 |
r = vhost_dev_set_features(hdev, hdev->log_enabled); |
842 |
if (r < 0) { |
843 |
goto fail_features;
|
844 |
} |
845 |
r = ioctl(hdev->control, VHOST_SET_MEM_TABLE, hdev->mem); |
846 |
if (r < 0) { |
847 |
r = -errno; |
848 |
goto fail_mem;
|
849 |
} |
850 |
for (i = 0; i < hdev->nvqs; ++i) { |
851 |
r = vhost_virtqueue_init(hdev, |
852 |
vdev, |
853 |
hdev->vqs + i, |
854 |
i); |
855 |
if (r < 0) { |
856 |
goto fail_vq;
|
857 |
} |
858 |
} |
859 |
|
860 |
if (hdev->log_enabled) {
|
861 |
hdev->log_size = vhost_get_log_size(hdev); |
862 |
hdev->log = hdev->log_size ? |
863 |
g_malloc0(hdev->log_size * sizeof *hdev->log) : NULL; |
864 |
r = ioctl(hdev->control, VHOST_SET_LOG_BASE, |
865 |
(uint64_t)(unsigned long)hdev->log); |
866 |
if (r < 0) { |
867 |
r = -errno; |
868 |
goto fail_log;
|
869 |
} |
870 |
} |
871 |
|
872 |
hdev->started = true;
|
873 |
|
874 |
return 0; |
875 |
fail_log:
|
876 |
fail_vq:
|
877 |
while (--i >= 0) { |
878 |
vhost_virtqueue_cleanup(hdev, |
879 |
vdev, |
880 |
hdev->vqs + i, |
881 |
i); |
882 |
} |
883 |
fail_mem:
|
884 |
fail_features:
|
885 |
vdev->binding->set_guest_notifiers(vdev->binding_opaque, false);
|
886 |
fail_notifiers:
|
887 |
fail:
|
888 |
return r;
|
889 |
} |
890 |
|
891 |
/* Host notifiers must be enabled at this point. */
|
892 |
void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev) |
893 |
{ |
894 |
int i, r;
|
895 |
|
896 |
for (i = 0; i < hdev->nvqs; ++i) { |
897 |
vhost_virtqueue_cleanup(hdev, |
898 |
vdev, |
899 |
hdev->vqs + i, |
900 |
i); |
901 |
} |
902 |
for (i = 0; i < hdev->n_mem_sections; ++i) { |
903 |
vhost_sync_dirty_bitmap(hdev, &hdev->mem_sections[i], |
904 |
0, (target_phys_addr_t)~0x0ull); |
905 |
} |
906 |
r = vdev->binding->set_guest_notifiers(vdev->binding_opaque, false);
|
907 |
if (r < 0) { |
908 |
fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
|
909 |
fflush(stderr); |
910 |
} |
911 |
assert (r >= 0);
|
912 |
|
913 |
hdev->started = false;
|
914 |
g_free(hdev->log); |
915 |
hdev->log = NULL;
|
916 |
hdev->log_size = 0;
|
917 |
} |