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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 "hw/virtio/vhost.h" |
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#include "hw/hw.h" |
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#include "qemu/range.h" |
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#include <linux/vhost.h> |
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#include "exec/address-spaces.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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hwaddr page_addr; |
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hwaddr section_offset; |
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hwaddr mr_offset; |
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bit -= 1;
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page_addr = addr + bit * VHOST_LOG_PAGE; |
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section_offset = page_addr - section->offset_within_address_space; |
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mr_offset = section_offset + section->offset_within_region; |
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memory_region_set_dirty(section->mr, mr_offset, 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_sync_dirty_bitmap(struct vhost_dev *dev, |
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MemoryRegionSection *section, |
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hwaddr first, |
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hwaddr last) |
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{ |
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int i;
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hwaddr start_addr; |
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hwaddr end_addr; |
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if (!dev->log_enabled || !dev->started) {
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return 0; |
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} |
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start_addr = section->offset_within_address_space; |
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end_addr = range_get_last(start_addr, section->size); |
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start_addr = MAX(first, start_addr); |
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end_addr = MIN(last, end_addr); |
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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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vhost_sync_dirty_bitmap(dev, section, 0x0, ~0x0ULL); |
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} |
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static void vhost_log_sync_range(struct vhost_dev *dev, |
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hwaddr first, hwaddr last) |
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{ |
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int i;
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/* FIXME: this is N^2 in number of sections */
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for (i = 0; i < dev->n_mem_sections; ++i) { |
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MemoryRegionSection *section = &dev->mem_sections[i]; |
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vhost_sync_dirty_bitmap(dev, section, first, last); |
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} |
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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;
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log = g_malloc0(size * sizeof *log);
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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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/* Sync only the range covered by the old log */
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if (dev->log_size) {
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vhost_log_sync_range(dev, 0, 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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} |
306 |
|
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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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hwaddr l; |
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void *p;
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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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} |
320 |
l = vq->ring_size; |
321 |
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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} |
326 |
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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} |
330 |
cpu_physical_memory_unmap(p, l, 0, 0); |
331 |
} |
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return 0; |
333 |
} |
334 |
|
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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, |
337 |
uint64_t size) |
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{ |
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int i, n = dev->mem->nregions;
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340 |
for (i = 0; i < n; ++i) { |
341 |
struct vhost_memory_region *reg = dev->mem->regions + i;
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342 |
if (ranges_overlap(reg->guest_phys_addr, reg->memory_size,
|
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start_addr, size)) { |
344 |
return reg;
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345 |
} |
346 |
} |
347 |
return NULL; |
348 |
} |
349 |
|
350 |
static bool vhost_dev_cmp_memory(struct vhost_dev *dev, |
351 |
uint64_t start_addr, |
352 |
uint64_t size, |
353 |
uint64_t uaddr) |
354 |
{ |
355 |
struct vhost_memory_region *reg = vhost_dev_find_reg(dev, start_addr, size);
|
356 |
uint64_t reglast; |
357 |
uint64_t memlast; |
358 |
|
359 |
if (!reg) {
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360 |
return true; |
361 |
} |
362 |
|
363 |
reglast = range_get_last(reg->guest_phys_addr, reg->memory_size); |
364 |
memlast = range_get_last(start_addr, size); |
365 |
|
366 |
/* Need to extend region? */
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367 |
if (start_addr < reg->guest_phys_addr || memlast > reglast) {
|
368 |
return true; |
369 |
} |
370 |
/* userspace_addr changed? */
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371 |
return uaddr != reg->userspace_addr + start_addr - reg->guest_phys_addr;
|
372 |
} |
373 |
|
374 |
static void vhost_set_memory(MemoryListener *listener, |
375 |
MemoryRegionSection *section, |
376 |
bool add)
|
377 |
{ |
378 |
struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
379 |
memory_listener); |
380 |
hwaddr start_addr = section->offset_within_address_space; |
381 |
ram_addr_t size = section->size; |
382 |
bool log_dirty = memory_region_is_logging(section->mr);
|
383 |
int s = offsetof(struct vhost_memory, regions) + |
384 |
(dev->mem->nregions + 1) * sizeof dev->mem->regions[0]; |
385 |
uint64_t log_size; |
386 |
int r;
|
387 |
void *ram;
|
388 |
|
389 |
dev->mem = g_realloc(dev->mem, s); |
390 |
|
391 |
if (log_dirty) {
|
392 |
add = false;
|
393 |
} |
394 |
|
395 |
assert(size); |
396 |
|
397 |
/* Optimize no-change case. At least cirrus_vga does this a lot at this time. */
|
398 |
ram = memory_region_get_ram_ptr(section->mr) + section->offset_within_region; |
399 |
if (add) {
|
400 |
if (!vhost_dev_cmp_memory(dev, start_addr, size, (uintptr_t)ram)) {
|
401 |
/* Region exists with same address. Nothing to do. */
|
402 |
return;
|
403 |
} |
404 |
} else {
|
405 |
if (!vhost_dev_find_reg(dev, start_addr, size)) {
|
406 |
/* Removing region that we don't access. Nothing to do. */
|
407 |
return;
|
408 |
} |
409 |
} |
410 |
|
411 |
vhost_dev_unassign_memory(dev, start_addr, size); |
412 |
if (add) {
|
413 |
/* Add given mapping, merging adjacent regions if any */
|
414 |
vhost_dev_assign_memory(dev, start_addr, size, (uintptr_t)ram); |
415 |
} else {
|
416 |
/* Remove old mapping for this memory, if any. */
|
417 |
vhost_dev_unassign_memory(dev, start_addr, size); |
418 |
} |
419 |
|
420 |
if (!dev->started) {
|
421 |
return;
|
422 |
} |
423 |
|
424 |
if (dev->started) {
|
425 |
r = vhost_verify_ring_mappings(dev, start_addr, size); |
426 |
assert(r >= 0);
|
427 |
} |
428 |
|
429 |
if (!dev->log_enabled) {
|
430 |
r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem); |
431 |
assert(r >= 0);
|
432 |
return;
|
433 |
} |
434 |
log_size = vhost_get_log_size(dev); |
435 |
/* We allocate an extra 4K bytes to log,
|
436 |
* to reduce the * number of reallocations. */
|
437 |
#define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log) |
438 |
/* To log more, must increase log size before table update. */
|
439 |
if (dev->log_size < log_size) {
|
440 |
vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER); |
441 |
} |
442 |
r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem); |
443 |
assert(r >= 0);
|
444 |
/* To log less, can only decrease log size after table update. */
|
445 |
if (dev->log_size > log_size + VHOST_LOG_BUFFER) {
|
446 |
vhost_dev_log_resize(dev, log_size); |
447 |
} |
448 |
} |
449 |
|
450 |
static bool vhost_section(MemoryRegionSection *section) |
451 |
{ |
452 |
return memory_region_is_ram(section->mr);
|
453 |
} |
454 |
|
455 |
static void vhost_begin(MemoryListener *listener) |
456 |
{ |
457 |
} |
458 |
|
459 |
static void vhost_commit(MemoryListener *listener) |
460 |
{ |
461 |
} |
462 |
|
463 |
static void vhost_region_add(MemoryListener *listener, |
464 |
MemoryRegionSection *section) |
465 |
{ |
466 |
struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
467 |
memory_listener); |
468 |
|
469 |
if (!vhost_section(section)) {
|
470 |
return;
|
471 |
} |
472 |
|
473 |
++dev->n_mem_sections; |
474 |
dev->mem_sections = g_renew(MemoryRegionSection, dev->mem_sections, |
475 |
dev->n_mem_sections); |
476 |
dev->mem_sections[dev->n_mem_sections - 1] = *section;
|
477 |
vhost_set_memory(listener, section, true);
|
478 |
} |
479 |
|
480 |
static void vhost_region_del(MemoryListener *listener, |
481 |
MemoryRegionSection *section) |
482 |
{ |
483 |
struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
484 |
memory_listener); |
485 |
int i;
|
486 |
|
487 |
if (!vhost_section(section)) {
|
488 |
return;
|
489 |
} |
490 |
|
491 |
vhost_set_memory(listener, section, false);
|
492 |
for (i = 0; i < dev->n_mem_sections; ++i) { |
493 |
if (dev->mem_sections[i].offset_within_address_space
|
494 |
== section->offset_within_address_space) { |
495 |
--dev->n_mem_sections; |
496 |
memmove(&dev->mem_sections[i], &dev->mem_sections[i+1],
|
497 |
(dev->n_mem_sections - i) * sizeof(*dev->mem_sections));
|
498 |
break;
|
499 |
} |
500 |
} |
501 |
} |
502 |
|
503 |
static void vhost_region_nop(MemoryListener *listener, |
504 |
MemoryRegionSection *section) |
505 |
{ |
506 |
} |
507 |
|
508 |
static int vhost_virtqueue_set_addr(struct vhost_dev *dev, |
509 |
struct vhost_virtqueue *vq,
|
510 |
unsigned idx, bool enable_log) |
511 |
{ |
512 |
struct vhost_vring_addr addr = {
|
513 |
.index = idx, |
514 |
.desc_user_addr = (uint64_t)(unsigned long)vq->desc, |
515 |
.avail_user_addr = (uint64_t)(unsigned long)vq->avail, |
516 |
.used_user_addr = (uint64_t)(unsigned long)vq->used, |
517 |
.log_guest_addr = vq->used_phys, |
518 |
.flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0, |
519 |
}; |
520 |
int r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr);
|
521 |
if (r < 0) { |
522 |
return -errno;
|
523 |
} |
524 |
return 0; |
525 |
} |
526 |
|
527 |
static int vhost_dev_set_features(struct vhost_dev *dev, bool enable_log) |
528 |
{ |
529 |
uint64_t features = dev->acked_features; |
530 |
int r;
|
531 |
if (enable_log) {
|
532 |
features |= 0x1 << VHOST_F_LOG_ALL;
|
533 |
} |
534 |
r = ioctl(dev->control, VHOST_SET_FEATURES, &features); |
535 |
return r < 0 ? -errno : 0; |
536 |
} |
537 |
|
538 |
static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log) |
539 |
{ |
540 |
int r, t, i;
|
541 |
r = vhost_dev_set_features(dev, enable_log); |
542 |
if (r < 0) { |
543 |
goto err_features;
|
544 |
} |
545 |
for (i = 0; i < dev->nvqs; ++i) { |
546 |
r = vhost_virtqueue_set_addr(dev, dev->vqs + i, i, |
547 |
enable_log); |
548 |
if (r < 0) { |
549 |
goto err_vq;
|
550 |
} |
551 |
} |
552 |
return 0; |
553 |
err_vq:
|
554 |
for (; i >= 0; --i) { |
555 |
t = vhost_virtqueue_set_addr(dev, dev->vqs + i, i, |
556 |
dev->log_enabled); |
557 |
assert(t >= 0);
|
558 |
} |
559 |
t = vhost_dev_set_features(dev, dev->log_enabled); |
560 |
assert(t >= 0);
|
561 |
err_features:
|
562 |
return r;
|
563 |
} |
564 |
|
565 |
static int vhost_migration_log(MemoryListener *listener, int enable) |
566 |
{ |
567 |
struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
568 |
memory_listener); |
569 |
int r;
|
570 |
if (!!enable == dev->log_enabled) {
|
571 |
return 0; |
572 |
} |
573 |
if (!dev->started) {
|
574 |
dev->log_enabled = enable; |
575 |
return 0; |
576 |
} |
577 |
if (!enable) {
|
578 |
r = vhost_dev_set_log(dev, false);
|
579 |
if (r < 0) { |
580 |
return r;
|
581 |
} |
582 |
if (dev->log) {
|
583 |
g_free(dev->log); |
584 |
} |
585 |
dev->log = NULL;
|
586 |
dev->log_size = 0;
|
587 |
} else {
|
588 |
vhost_dev_log_resize(dev, vhost_get_log_size(dev)); |
589 |
r = vhost_dev_set_log(dev, true);
|
590 |
if (r < 0) { |
591 |
return r;
|
592 |
} |
593 |
} |
594 |
dev->log_enabled = enable; |
595 |
return 0; |
596 |
} |
597 |
|
598 |
static void vhost_log_global_start(MemoryListener *listener) |
599 |
{ |
600 |
int r;
|
601 |
|
602 |
r = vhost_migration_log(listener, true);
|
603 |
if (r < 0) { |
604 |
abort(); |
605 |
} |
606 |
} |
607 |
|
608 |
static void vhost_log_global_stop(MemoryListener *listener) |
609 |
{ |
610 |
int r;
|
611 |
|
612 |
r = vhost_migration_log(listener, false);
|
613 |
if (r < 0) { |
614 |
abort(); |
615 |
} |
616 |
} |
617 |
|
618 |
static void vhost_log_start(MemoryListener *listener, |
619 |
MemoryRegionSection *section) |
620 |
{ |
621 |
/* FIXME: implement */
|
622 |
} |
623 |
|
624 |
static void vhost_log_stop(MemoryListener *listener, |
625 |
MemoryRegionSection *section) |
626 |
{ |
627 |
/* FIXME: implement */
|
628 |
} |
629 |
|
630 |
static int vhost_virtqueue_start(struct vhost_dev *dev, |
631 |
struct VirtIODevice *vdev,
|
632 |
struct vhost_virtqueue *vq,
|
633 |
unsigned idx)
|
634 |
{ |
635 |
hwaddr s, l, a; |
636 |
int r;
|
637 |
int vhost_vq_index = idx - dev->vq_index;
|
638 |
struct vhost_vring_file file = {
|
639 |
.index = vhost_vq_index |
640 |
}; |
641 |
struct vhost_vring_state state = {
|
642 |
.index = vhost_vq_index |
643 |
}; |
644 |
struct VirtQueue *vvq = virtio_get_queue(vdev, idx);
|
645 |
|
646 |
assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs); |
647 |
|
648 |
vq->num = state.num = virtio_queue_get_num(vdev, idx); |
649 |
r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state); |
650 |
if (r) {
|
651 |
return -errno;
|
652 |
} |
653 |
|
654 |
state.num = virtio_queue_get_last_avail_idx(vdev, idx); |
655 |
r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state); |
656 |
if (r) {
|
657 |
return -errno;
|
658 |
} |
659 |
|
660 |
s = l = virtio_queue_get_desc_size(vdev, idx); |
661 |
a = virtio_queue_get_desc_addr(vdev, idx); |
662 |
vq->desc = cpu_physical_memory_map(a, &l, 0);
|
663 |
if (!vq->desc || l != s) {
|
664 |
r = -ENOMEM; |
665 |
goto fail_alloc_desc;
|
666 |
} |
667 |
s = l = virtio_queue_get_avail_size(vdev, idx); |
668 |
a = virtio_queue_get_avail_addr(vdev, idx); |
669 |
vq->avail = cpu_physical_memory_map(a, &l, 0);
|
670 |
if (!vq->avail || l != s) {
|
671 |
r = -ENOMEM; |
672 |
goto fail_alloc_avail;
|
673 |
} |
674 |
vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx); |
675 |
vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx); |
676 |
vq->used = cpu_physical_memory_map(a, &l, 1);
|
677 |
if (!vq->used || l != s) {
|
678 |
r = -ENOMEM; |
679 |
goto fail_alloc_used;
|
680 |
} |
681 |
|
682 |
vq->ring_size = s = l = virtio_queue_get_ring_size(vdev, idx); |
683 |
vq->ring_phys = a = virtio_queue_get_ring_addr(vdev, idx); |
684 |
vq->ring = cpu_physical_memory_map(a, &l, 1);
|
685 |
if (!vq->ring || l != s) {
|
686 |
r = -ENOMEM; |
687 |
goto fail_alloc_ring;
|
688 |
} |
689 |
|
690 |
r = vhost_virtqueue_set_addr(dev, vq, vhost_vq_index, dev->log_enabled); |
691 |
if (r < 0) { |
692 |
r = -errno; |
693 |
goto fail_alloc;
|
694 |
} |
695 |
|
696 |
file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq)); |
697 |
r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file); |
698 |
if (r) {
|
699 |
r = -errno; |
700 |
goto fail_kick;
|
701 |
} |
702 |
|
703 |
/* Clear and discard previous events if any. */
|
704 |
event_notifier_test_and_clear(&vq->masked_notifier); |
705 |
|
706 |
return 0; |
707 |
|
708 |
fail_kick:
|
709 |
fail_alloc:
|
710 |
cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx), |
711 |
0, 0); |
712 |
fail_alloc_ring:
|
713 |
cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx), |
714 |
0, 0); |
715 |
fail_alloc_used:
|
716 |
cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx), |
717 |
0, 0); |
718 |
fail_alloc_avail:
|
719 |
cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx), |
720 |
0, 0); |
721 |
fail_alloc_desc:
|
722 |
return r;
|
723 |
} |
724 |
|
725 |
static void vhost_virtqueue_stop(struct vhost_dev *dev, |
726 |
struct VirtIODevice *vdev,
|
727 |
struct vhost_virtqueue *vq,
|
728 |
unsigned idx)
|
729 |
{ |
730 |
struct vhost_vring_state state = {
|
731 |
.index = idx - dev->vq_index |
732 |
}; |
733 |
int r;
|
734 |
assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs); |
735 |
r = ioctl(dev->control, VHOST_GET_VRING_BASE, &state); |
736 |
if (r < 0) { |
737 |
fprintf(stderr, "vhost VQ %d ring restore failed: %d\n", idx, r);
|
738 |
fflush(stderr); |
739 |
} |
740 |
virtio_queue_set_last_avail_idx(vdev, idx, state.num); |
741 |
assert (r >= 0);
|
742 |
cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx), |
743 |
0, virtio_queue_get_ring_size(vdev, idx));
|
744 |
cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx), |
745 |
1, virtio_queue_get_used_size(vdev, idx));
|
746 |
cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx), |
747 |
0, virtio_queue_get_avail_size(vdev, idx));
|
748 |
cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx), |
749 |
0, virtio_queue_get_desc_size(vdev, idx));
|
750 |
} |
751 |
|
752 |
static void vhost_eventfd_add(MemoryListener *listener, |
753 |
MemoryRegionSection *section, |
754 |
bool match_data, uint64_t data, EventNotifier *e)
|
755 |
{ |
756 |
} |
757 |
|
758 |
static void vhost_eventfd_del(MemoryListener *listener, |
759 |
MemoryRegionSection *section, |
760 |
bool match_data, uint64_t data, EventNotifier *e)
|
761 |
{ |
762 |
} |
763 |
|
764 |
static int vhost_virtqueue_init(struct vhost_dev *dev, |
765 |
struct vhost_virtqueue *vq, int n) |
766 |
{ |
767 |
struct vhost_vring_file file = {
|
768 |
.index = n, |
769 |
}; |
770 |
int r = event_notifier_init(&vq->masked_notifier, 0); |
771 |
if (r < 0) { |
772 |
return r;
|
773 |
} |
774 |
|
775 |
file.fd = event_notifier_get_fd(&vq->masked_notifier); |
776 |
r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file); |
777 |
if (r) {
|
778 |
r = -errno; |
779 |
goto fail_call;
|
780 |
} |
781 |
return 0; |
782 |
fail_call:
|
783 |
event_notifier_cleanup(&vq->masked_notifier); |
784 |
return r;
|
785 |
} |
786 |
|
787 |
static void vhost_virtqueue_cleanup(struct vhost_virtqueue *vq) |
788 |
{ |
789 |
event_notifier_cleanup(&vq->masked_notifier); |
790 |
} |
791 |
|
792 |
int vhost_dev_init(struct vhost_dev *hdev, int devfd, const char *devpath, |
793 |
bool force)
|
794 |
{ |
795 |
uint64_t features; |
796 |
int i, r;
|
797 |
if (devfd >= 0) { |
798 |
hdev->control = devfd; |
799 |
} else {
|
800 |
hdev->control = open(devpath, O_RDWR); |
801 |
if (hdev->control < 0) { |
802 |
return -errno;
|
803 |
} |
804 |
} |
805 |
r = ioctl(hdev->control, VHOST_SET_OWNER, NULL);
|
806 |
if (r < 0) { |
807 |
goto fail;
|
808 |
} |
809 |
|
810 |
r = ioctl(hdev->control, VHOST_GET_FEATURES, &features); |
811 |
if (r < 0) { |
812 |
goto fail;
|
813 |
} |
814 |
|
815 |
for (i = 0; i < hdev->nvqs; ++i) { |
816 |
r = vhost_virtqueue_init(hdev, hdev->vqs + i, i); |
817 |
if (r < 0) { |
818 |
goto fail_vq;
|
819 |
} |
820 |
} |
821 |
hdev->features = features; |
822 |
|
823 |
hdev->memory_listener = (MemoryListener) { |
824 |
.begin = vhost_begin, |
825 |
.commit = vhost_commit, |
826 |
.region_add = vhost_region_add, |
827 |
.region_del = vhost_region_del, |
828 |
.region_nop = vhost_region_nop, |
829 |
.log_start = vhost_log_start, |
830 |
.log_stop = vhost_log_stop, |
831 |
.log_sync = vhost_log_sync, |
832 |
.log_global_start = vhost_log_global_start, |
833 |
.log_global_stop = vhost_log_global_stop, |
834 |
.eventfd_add = vhost_eventfd_add, |
835 |
.eventfd_del = vhost_eventfd_del, |
836 |
.priority = 10
|
837 |
}; |
838 |
hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions));
|
839 |
hdev->n_mem_sections = 0;
|
840 |
hdev->mem_sections = NULL;
|
841 |
hdev->log = NULL;
|
842 |
hdev->log_size = 0;
|
843 |
hdev->log_enabled = false;
|
844 |
hdev->started = false;
|
845 |
memory_listener_register(&hdev->memory_listener, &address_space_memory); |
846 |
hdev->force = force; |
847 |
return 0; |
848 |
fail_vq:
|
849 |
while (--i >= 0) { |
850 |
vhost_virtqueue_cleanup(hdev->vqs + i); |
851 |
} |
852 |
fail:
|
853 |
r = -errno; |
854 |
close(hdev->control); |
855 |
return r;
|
856 |
} |
857 |
|
858 |
void vhost_dev_cleanup(struct vhost_dev *hdev) |
859 |
{ |
860 |
int i;
|
861 |
for (i = 0; i < hdev->nvqs; ++i) { |
862 |
vhost_virtqueue_cleanup(hdev->vqs + i); |
863 |
} |
864 |
memory_listener_unregister(&hdev->memory_listener); |
865 |
g_free(hdev->mem); |
866 |
g_free(hdev->mem_sections); |
867 |
close(hdev->control); |
868 |
} |
869 |
|
870 |
bool vhost_dev_query(struct vhost_dev *hdev, VirtIODevice *vdev) |
871 |
{ |
872 |
return !vdev->binding->query_guest_notifiers ||
|
873 |
vdev->binding->query_guest_notifiers(vdev->binding_opaque) || |
874 |
hdev->force; |
875 |
} |
876 |
|
877 |
/* Stop processing guest IO notifications in qemu.
|
878 |
* Start processing them in vhost in kernel.
|
879 |
*/
|
880 |
int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) |
881 |
{ |
882 |
int i, r;
|
883 |
if (!vdev->binding->set_host_notifier) {
|
884 |
fprintf(stderr, "binding does not support host notifiers\n");
|
885 |
r = -ENOSYS; |
886 |
goto fail;
|
887 |
} |
888 |
|
889 |
for (i = 0; i < hdev->nvqs; ++i) { |
890 |
r = vdev->binding->set_host_notifier(vdev->binding_opaque, |
891 |
hdev->vq_index + i, |
892 |
true);
|
893 |
if (r < 0) { |
894 |
fprintf(stderr, "vhost VQ %d notifier binding failed: %d\n", i, -r);
|
895 |
goto fail_vq;
|
896 |
} |
897 |
} |
898 |
|
899 |
return 0; |
900 |
fail_vq:
|
901 |
while (--i >= 0) { |
902 |
r = vdev->binding->set_host_notifier(vdev->binding_opaque, |
903 |
hdev->vq_index + i, |
904 |
false);
|
905 |
if (r < 0) { |
906 |
fprintf(stderr, "vhost VQ %d notifier cleanup error: %d\n", i, -r);
|
907 |
fflush(stderr); |
908 |
} |
909 |
assert (r >= 0);
|
910 |
} |
911 |
fail:
|
912 |
return r;
|
913 |
} |
914 |
|
915 |
/* Stop processing guest IO notifications in vhost.
|
916 |
* Start processing them in qemu.
|
917 |
* This might actually run the qemu handlers right away,
|
918 |
* so virtio in qemu must be completely setup when this is called.
|
919 |
*/
|
920 |
void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) |
921 |
{ |
922 |
int i, r;
|
923 |
|
924 |
for (i = 0; i < hdev->nvqs; ++i) { |
925 |
r = vdev->binding->set_host_notifier(vdev->binding_opaque, |
926 |
hdev->vq_index + i, |
927 |
false);
|
928 |
if (r < 0) { |
929 |
fprintf(stderr, "vhost VQ %d notifier cleanup failed: %d\n", i, -r);
|
930 |
fflush(stderr); |
931 |
} |
932 |
assert (r >= 0);
|
933 |
} |
934 |
} |
935 |
|
936 |
/* Test and clear event pending status.
|
937 |
* Should be called after unmask to avoid losing events.
|
938 |
*/
|
939 |
bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n) |
940 |
{ |
941 |
struct vhost_virtqueue *vq = hdev->vqs + n - hdev->vq_index;
|
942 |
assert(hdev->started); |
943 |
assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); |
944 |
return event_notifier_test_and_clear(&vq->masked_notifier);
|
945 |
} |
946 |
|
947 |
/* Mask/unmask events from this vq. */
|
948 |
void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, |
949 |
bool mask)
|
950 |
{ |
951 |
struct VirtQueue *vvq = virtio_get_queue(vdev, n);
|
952 |
int r, index = n - hdev->vq_index;
|
953 |
|
954 |
assert(hdev->started); |
955 |
assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); |
956 |
|
957 |
struct vhost_vring_file file = {
|
958 |
.index = index |
959 |
}; |
960 |
if (mask) {
|
961 |
file.fd = event_notifier_get_fd(&hdev->vqs[index].masked_notifier); |
962 |
} else {
|
963 |
file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq)); |
964 |
} |
965 |
r = ioctl(hdev->control, VHOST_SET_VRING_CALL, &file); |
966 |
assert(r >= 0);
|
967 |
} |
968 |
|
969 |
/* Host notifiers must be enabled at this point. */
|
970 |
int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev) |
971 |
{ |
972 |
int i, r;
|
973 |
|
974 |
hdev->started = true;
|
975 |
|
976 |
r = vhost_dev_set_features(hdev, hdev->log_enabled); |
977 |
if (r < 0) { |
978 |
goto fail_features;
|
979 |
} |
980 |
r = ioctl(hdev->control, VHOST_SET_MEM_TABLE, hdev->mem); |
981 |
if (r < 0) { |
982 |
r = -errno; |
983 |
goto fail_mem;
|
984 |
} |
985 |
for (i = 0; i < hdev->nvqs; ++i) { |
986 |
r = vhost_virtqueue_start(hdev, |
987 |
vdev, |
988 |
hdev->vqs + i, |
989 |
hdev->vq_index + i); |
990 |
if (r < 0) { |
991 |
goto fail_vq;
|
992 |
} |
993 |
} |
994 |
|
995 |
if (hdev->log_enabled) {
|
996 |
hdev->log_size = vhost_get_log_size(hdev); |
997 |
hdev->log = hdev->log_size ? |
998 |
g_malloc0(hdev->log_size * sizeof *hdev->log) : NULL; |
999 |
r = ioctl(hdev->control, VHOST_SET_LOG_BASE, |
1000 |
(uint64_t)(unsigned long)hdev->log); |
1001 |
if (r < 0) { |
1002 |
r = -errno; |
1003 |
goto fail_log;
|
1004 |
} |
1005 |
} |
1006 |
|
1007 |
return 0; |
1008 |
fail_log:
|
1009 |
fail_vq:
|
1010 |
while (--i >= 0) { |
1011 |
vhost_virtqueue_stop(hdev, |
1012 |
vdev, |
1013 |
hdev->vqs + i, |
1014 |
hdev->vq_index + i); |
1015 |
} |
1016 |
i = hdev->nvqs; |
1017 |
fail_mem:
|
1018 |
fail_features:
|
1019 |
|
1020 |
hdev->started = false;
|
1021 |
return r;
|
1022 |
} |
1023 |
|
1024 |
/* Host notifiers must be enabled at this point. */
|
1025 |
void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev) |
1026 |
{ |
1027 |
int i;
|
1028 |
|
1029 |
for (i = 0; i < hdev->nvqs; ++i) { |
1030 |
vhost_virtqueue_stop(hdev, |
1031 |
vdev, |
1032 |
hdev->vqs + i, |
1033 |
hdev->vq_index + i); |
1034 |
} |
1035 |
vhost_log_sync_range(hdev, 0, ~0x0ull); |
1036 |
|
1037 |
hdev->started = false;
|
1038 |
g_free(hdev->log); |
1039 |
hdev->log = NULL;
|
1040 |
hdev->log_size = 0;
|
1041 |
} |
1042 |
|