965 lines
29 KiB
C
965 lines
29 KiB
C
/*
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* vhost support
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*
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* Copyright Red Hat, Inc. 2010
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*
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* Authors:
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* Michael S. Tsirkin <mst@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include <sys/ioctl.h>
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#include "vhost.h"
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#include "hw/hw.h"
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#include "qemu/range.h"
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#include <linux/vhost.h>
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#include "exec/address-spaces.h"
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static void vhost_dev_sync_region(struct vhost_dev *dev,
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MemoryRegionSection *section,
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uint64_t mfirst, uint64_t mlast,
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uint64_t rfirst, uint64_t rlast)
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{
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uint64_t start = MAX(mfirst, rfirst);
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uint64_t end = MIN(mlast, rlast);
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vhost_log_chunk_t *from = dev->log + start / VHOST_LOG_CHUNK;
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vhost_log_chunk_t *to = dev->log + end / VHOST_LOG_CHUNK + 1;
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uint64_t addr = (start / VHOST_LOG_CHUNK) * VHOST_LOG_CHUNK;
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if (end < start) {
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return;
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}
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assert(end / VHOST_LOG_CHUNK < dev->log_size);
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assert(start / VHOST_LOG_CHUNK < dev->log_size);
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for (;from < to; ++from) {
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vhost_log_chunk_t log;
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int bit;
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/* We first check with non-atomic: much cheaper,
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* and we expect non-dirty to be the common case. */
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if (!*from) {
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addr += VHOST_LOG_CHUNK;
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continue;
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}
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/* Data must be read atomically. We don't really
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* need the barrier semantics of __sync
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* builtins, but it's easier to use them than
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* roll our own. */
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log = __sync_fetch_and_and(from, 0);
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while ((bit = sizeof(log) > sizeof(int) ?
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ffsll(log) : ffs(log))) {
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ram_addr_t ram_addr;
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bit -= 1;
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ram_addr = section->offset_within_region + bit * VHOST_LOG_PAGE;
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memory_region_set_dirty(section->mr, ram_addr, VHOST_LOG_PAGE);
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log &= ~(0x1ull << bit);
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}
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addr += VHOST_LOG_CHUNK;
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}
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}
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static int vhost_sync_dirty_bitmap(struct vhost_dev *dev,
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MemoryRegionSection *section,
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hwaddr start_addr,
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hwaddr 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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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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hwaddr start_addr = section->offset_within_address_space;
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hwaddr 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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/* 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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/* Sync only the range covered by the old log */
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vhost_sync_dirty_bitmap(dev, &dev->mem_sections[i], 0,
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dev->log_size * VHOST_LOG_CHUNK - 1);
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}
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if (dev->log) {
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g_free(dev->log);
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}
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dev->log = log;
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dev->log_size = size;
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}
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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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}
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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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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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}
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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;
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uint64_t memlast;
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if (!reg) {
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return true;
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}
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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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/* Need to extend region? */
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if (start_addr < reg->guest_phys_addr || memlast > reglast) {
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return true;
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}
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/* userspace_addr changed? */
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return uaddr != reg->userspace_addr + start_addr - reg->guest_phys_addr;
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}
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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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{
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struct vhost_dev *dev = container_of(listener, struct vhost_dev,
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memory_listener);
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hwaddr start_addr = section->offset_within_address_space;
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ram_addr_t size = section->size;
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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];
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uint64_t log_size;
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int r;
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void *ram;
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dev->mem = g_realloc(dev->mem, s);
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if (log_dirty) {
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add = false;
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}
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assert(size);
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/* 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) + section->offset_within_region;
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if (add) {
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if (!vhost_dev_cmp_memory(dev, start_addr, size, (uintptr_t)ram)) {
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/* Region exists with same address. Nothing to do. */
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return;
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}
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} else {
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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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}
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}
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vhost_dev_unassign_memory(dev, start_addr, size);
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if (add) {
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/* Add given mapping, merging adjacent regions if any */
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vhost_dev_assign_memory(dev, start_addr, size, (uintptr_t)ram);
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} else {
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/* Remove old mapping for this memory, if any. */
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vhost_dev_unassign_memory(dev, start_addr, size);
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}
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if (!dev->started) {
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return;
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}
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if (dev->started) {
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r = vhost_verify_ring_mappings(dev, start_addr, size);
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assert(r >= 0);
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}
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if (!dev->log_enabled) {
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r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
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assert(r >= 0);
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return;
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}
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log_size = vhost_get_log_size(dev);
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/* We allocate an extra 4K bytes to log,
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* to reduce the * number of reallocations. */
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#define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log)
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/* To log more, must increase log size before table update. */
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if (dev->log_size < log_size) {
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vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER);
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}
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r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
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assert(r >= 0);
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/* To log less, can only decrease log size after table update. */
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if (dev->log_size > log_size + VHOST_LOG_BUFFER) {
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vhost_dev_log_resize(dev, log_size);
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}
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}
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static bool vhost_section(MemoryRegionSection *section)
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{
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return memory_region_is_ram(section->mr);
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}
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|
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static void vhost_begin(MemoryListener *listener)
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{
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}
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static void vhost_commit(MemoryListener *listener)
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{
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}
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static void vhost_region_add(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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if (!vhost_section(section)) {
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return;
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}
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++dev->n_mem_sections;
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dev->mem_sections = g_renew(MemoryRegionSection, dev->mem_sections,
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dev->n_mem_sections);
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dev->mem_sections[dev->n_mem_sections - 1] = *section;
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vhost_set_memory(listener, section, true);
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}
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|
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static void vhost_region_del(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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int i;
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|
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if (!vhost_section(section)) {
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return;
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}
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vhost_set_memory(listener, section, false);
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for (i = 0; i < dev->n_mem_sections; ++i) {
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if (dev->mem_sections[i].offset_within_address_space
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== section->offset_within_address_space) {
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--dev->n_mem_sections;
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memmove(&dev->mem_sections[i], &dev->mem_sections[i+1],
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(dev->n_mem_sections - i) * sizeof(*dev->mem_sections));
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break;
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}
|
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}
|
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}
|
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|
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static void vhost_region_nop(MemoryListener *listener,
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MemoryRegionSection *section)
|
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{
|
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}
|
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|
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static int vhost_virtqueue_set_addr(struct vhost_dev *dev,
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struct vhost_virtqueue *vq,
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unsigned idx, bool enable_log)
|
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{
|
|
struct vhost_vring_addr addr = {
|
|
.index = idx,
|
|
.desc_user_addr = (uint64_t)(unsigned long)vq->desc,
|
|
.avail_user_addr = (uint64_t)(unsigned long)vq->avail,
|
|
.used_user_addr = (uint64_t)(unsigned long)vq->used,
|
|
.log_guest_addr = vq->used_phys,
|
|
.flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0,
|
|
};
|
|
int r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr);
|
|
if (r < 0) {
|
|
return -errno;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_dev_set_features(struct vhost_dev *dev, bool enable_log)
|
|
{
|
|
uint64_t features = dev->acked_features;
|
|
int r;
|
|
if (enable_log) {
|
|
features |= 0x1 << VHOST_F_LOG_ALL;
|
|
}
|
|
r = ioctl(dev->control, VHOST_SET_FEATURES, &features);
|
|
return r < 0 ? -errno : 0;
|
|
}
|
|
|
|
static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log)
|
|
{
|
|
int r, t, i;
|
|
r = vhost_dev_set_features(dev, enable_log);
|
|
if (r < 0) {
|
|
goto err_features;
|
|
}
|
|
for (i = 0; i < dev->nvqs; ++i) {
|
|
r = vhost_virtqueue_set_addr(dev, dev->vqs + i, i,
|
|
enable_log);
|
|
if (r < 0) {
|
|
goto err_vq;
|
|
}
|
|
}
|
|
return 0;
|
|
err_vq:
|
|
for (; i >= 0; --i) {
|
|
t = vhost_virtqueue_set_addr(dev, dev->vqs + i, i,
|
|
dev->log_enabled);
|
|
assert(t >= 0);
|
|
}
|
|
t = vhost_dev_set_features(dev, dev->log_enabled);
|
|
assert(t >= 0);
|
|
err_features:
|
|
return r;
|
|
}
|
|
|
|
static int vhost_migration_log(MemoryListener *listener, int enable)
|
|
{
|
|
struct vhost_dev *dev = container_of(listener, struct vhost_dev,
|
|
memory_listener);
|
|
int r;
|
|
if (!!enable == dev->log_enabled) {
|
|
return 0;
|
|
}
|
|
if (!dev->started) {
|
|
dev->log_enabled = enable;
|
|
return 0;
|
|
}
|
|
if (!enable) {
|
|
r = vhost_dev_set_log(dev, false);
|
|
if (r < 0) {
|
|
return r;
|
|
}
|
|
if (dev->log) {
|
|
g_free(dev->log);
|
|
}
|
|
dev->log = NULL;
|
|
dev->log_size = 0;
|
|
} else {
|
|
vhost_dev_log_resize(dev, vhost_get_log_size(dev));
|
|
r = vhost_dev_set_log(dev, true);
|
|
if (r < 0) {
|
|
return r;
|
|
}
|
|
}
|
|
dev->log_enabled = enable;
|
|
return 0;
|
|
}
|
|
|
|
static void vhost_log_global_start(MemoryListener *listener)
|
|
{
|
|
int r;
|
|
|
|
r = vhost_migration_log(listener, true);
|
|
if (r < 0) {
|
|
abort();
|
|
}
|
|
}
|
|
|
|
static void vhost_log_global_stop(MemoryListener *listener)
|
|
{
|
|
int r;
|
|
|
|
r = vhost_migration_log(listener, false);
|
|
if (r < 0) {
|
|
abort();
|
|
}
|
|
}
|
|
|
|
static void vhost_log_start(MemoryListener *listener,
|
|
MemoryRegionSection *section)
|
|
{
|
|
/* FIXME: implement */
|
|
}
|
|
|
|
static void vhost_log_stop(MemoryListener *listener,
|
|
MemoryRegionSection *section)
|
|
{
|
|
/* FIXME: implement */
|
|
}
|
|
|
|
static int vhost_virtqueue_init(struct vhost_dev *dev,
|
|
struct VirtIODevice *vdev,
|
|
struct vhost_virtqueue *vq,
|
|
unsigned idx)
|
|
{
|
|
hwaddr s, l, a;
|
|
int r;
|
|
struct vhost_vring_file file = {
|
|
.index = idx,
|
|
};
|
|
struct vhost_vring_state state = {
|
|
.index = idx,
|
|
};
|
|
struct VirtQueue *vvq = virtio_get_queue(vdev, idx);
|
|
|
|
vq->num = state.num = virtio_queue_get_num(vdev, idx);
|
|
r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state);
|
|
if (r) {
|
|
return -errno;
|
|
}
|
|
|
|
state.num = virtio_queue_get_last_avail_idx(vdev, idx);
|
|
r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state);
|
|
if (r) {
|
|
return -errno;
|
|
}
|
|
|
|
s = l = virtio_queue_get_desc_size(vdev, idx);
|
|
a = virtio_queue_get_desc_addr(vdev, idx);
|
|
vq->desc = cpu_physical_memory_map(a, &l, 0);
|
|
if (!vq->desc || l != s) {
|
|
r = -ENOMEM;
|
|
goto fail_alloc_desc;
|
|
}
|
|
s = l = virtio_queue_get_avail_size(vdev, idx);
|
|
a = virtio_queue_get_avail_addr(vdev, idx);
|
|
vq->avail = cpu_physical_memory_map(a, &l, 0);
|
|
if (!vq->avail || l != s) {
|
|
r = -ENOMEM;
|
|
goto fail_alloc_avail;
|
|
}
|
|
vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx);
|
|
vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx);
|
|
vq->used = cpu_physical_memory_map(a, &l, 1);
|
|
if (!vq->used || l != s) {
|
|
r = -ENOMEM;
|
|
goto fail_alloc_used;
|
|
}
|
|
|
|
vq->ring_size = s = l = virtio_queue_get_ring_size(vdev, idx);
|
|
vq->ring_phys = a = virtio_queue_get_ring_addr(vdev, idx);
|
|
vq->ring = cpu_physical_memory_map(a, &l, 1);
|
|
if (!vq->ring || l != s) {
|
|
r = -ENOMEM;
|
|
goto fail_alloc_ring;
|
|
}
|
|
|
|
r = vhost_virtqueue_set_addr(dev, vq, idx, dev->log_enabled);
|
|
if (r < 0) {
|
|
r = -errno;
|
|
goto fail_alloc;
|
|
}
|
|
file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq));
|
|
r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file);
|
|
if (r) {
|
|
r = -errno;
|
|
goto fail_kick;
|
|
}
|
|
|
|
file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq));
|
|
r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file);
|
|
if (r) {
|
|
r = -errno;
|
|
goto fail_call;
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail_call:
|
|
fail_kick:
|
|
fail_alloc:
|
|
cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx),
|
|
0, 0);
|
|
fail_alloc_ring:
|
|
cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx),
|
|
0, 0);
|
|
fail_alloc_used:
|
|
cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx),
|
|
0, 0);
|
|
fail_alloc_avail:
|
|
cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx),
|
|
0, 0);
|
|
fail_alloc_desc:
|
|
return r;
|
|
}
|
|
|
|
static void vhost_virtqueue_cleanup(struct vhost_dev *dev,
|
|
struct VirtIODevice *vdev,
|
|
struct vhost_virtqueue *vq,
|
|
unsigned idx)
|
|
{
|
|
struct vhost_vring_state state = {
|
|
.index = idx,
|
|
};
|
|
int r;
|
|
r = ioctl(dev->control, VHOST_GET_VRING_BASE, &state);
|
|
if (r < 0) {
|
|
fprintf(stderr, "vhost VQ %d ring restore failed: %d\n", idx, r);
|
|
fflush(stderr);
|
|
}
|
|
virtio_queue_set_last_avail_idx(vdev, idx, state.num);
|
|
assert (r >= 0);
|
|
cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx),
|
|
0, virtio_queue_get_ring_size(vdev, idx));
|
|
cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx),
|
|
1, virtio_queue_get_used_size(vdev, idx));
|
|
cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx),
|
|
0, virtio_queue_get_avail_size(vdev, idx));
|
|
cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx),
|
|
0, virtio_queue_get_desc_size(vdev, idx));
|
|
}
|
|
|
|
static void vhost_eventfd_add(MemoryListener *listener,
|
|
MemoryRegionSection *section,
|
|
bool match_data, uint64_t data, EventNotifier *e)
|
|
{
|
|
}
|
|
|
|
static void vhost_eventfd_del(MemoryListener *listener,
|
|
MemoryRegionSection *section,
|
|
bool match_data, uint64_t data, EventNotifier *e)
|
|
{
|
|
}
|
|
|
|
int vhost_dev_init(struct vhost_dev *hdev, int devfd, const char *devpath,
|
|
bool force)
|
|
{
|
|
uint64_t features;
|
|
int r;
|
|
if (devfd >= 0) {
|
|
hdev->control = devfd;
|
|
} else {
|
|
hdev->control = open(devpath, O_RDWR);
|
|
if (hdev->control < 0) {
|
|
return -errno;
|
|
}
|
|
}
|
|
r = ioctl(hdev->control, VHOST_SET_OWNER, NULL);
|
|
if (r < 0) {
|
|
goto fail;
|
|
}
|
|
|
|
r = ioctl(hdev->control, VHOST_GET_FEATURES, &features);
|
|
if (r < 0) {
|
|
goto fail;
|
|
}
|
|
hdev->features = features;
|
|
|
|
hdev->memory_listener = (MemoryListener) {
|
|
.begin = vhost_begin,
|
|
.commit = vhost_commit,
|
|
.region_add = vhost_region_add,
|
|
.region_del = vhost_region_del,
|
|
.region_nop = vhost_region_nop,
|
|
.log_start = vhost_log_start,
|
|
.log_stop = vhost_log_stop,
|
|
.log_sync = vhost_log_sync,
|
|
.log_global_start = vhost_log_global_start,
|
|
.log_global_stop = vhost_log_global_stop,
|
|
.eventfd_add = vhost_eventfd_add,
|
|
.eventfd_del = vhost_eventfd_del,
|
|
.priority = 10
|
|
};
|
|
hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions));
|
|
hdev->n_mem_sections = 0;
|
|
hdev->mem_sections = NULL;
|
|
hdev->log = NULL;
|
|
hdev->log_size = 0;
|
|
hdev->log_enabled = false;
|
|
hdev->started = false;
|
|
memory_listener_register(&hdev->memory_listener, &address_space_memory);
|
|
hdev->force = force;
|
|
return 0;
|
|
fail:
|
|
r = -errno;
|
|
close(hdev->control);
|
|
return r;
|
|
}
|
|
|
|
void vhost_dev_cleanup(struct vhost_dev *hdev)
|
|
{
|
|
memory_listener_unregister(&hdev->memory_listener);
|
|
g_free(hdev->mem);
|
|
g_free(hdev->mem_sections);
|
|
close(hdev->control);
|
|
}
|
|
|
|
bool vhost_dev_query(struct vhost_dev *hdev, VirtIODevice *vdev)
|
|
{
|
|
return !vdev->binding->query_guest_notifiers ||
|
|
vdev->binding->query_guest_notifiers(vdev->binding_opaque) ||
|
|
hdev->force;
|
|
}
|
|
|
|
/* Stop processing guest IO notifications in qemu.
|
|
* Start processing them in vhost in kernel.
|
|
*/
|
|
int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev)
|
|
{
|
|
int i, r;
|
|
if (!vdev->binding->set_host_notifier) {
|
|
fprintf(stderr, "binding does not support host notifiers\n");
|
|
r = -ENOSYS;
|
|
goto fail;
|
|
}
|
|
|
|
for (i = 0; i < hdev->nvqs; ++i) {
|
|
r = vdev->binding->set_host_notifier(vdev->binding_opaque, i, true);
|
|
if (r < 0) {
|
|
fprintf(stderr, "vhost VQ %d notifier binding failed: %d\n", i, -r);
|
|
goto fail_vq;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
fail_vq:
|
|
while (--i >= 0) {
|
|
r = vdev->binding->set_host_notifier(vdev->binding_opaque, i, false);
|
|
if (r < 0) {
|
|
fprintf(stderr, "vhost VQ %d notifier cleanup error: %d\n", i, -r);
|
|
fflush(stderr);
|
|
}
|
|
assert (r >= 0);
|
|
}
|
|
fail:
|
|
return r;
|
|
}
|
|
|
|
/* Stop processing guest IO notifications in vhost.
|
|
* Start processing them in qemu.
|
|
* This might actually run the qemu handlers right away,
|
|
* so virtio in qemu must be completely setup when this is called.
|
|
*/
|
|
void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev)
|
|
{
|
|
int i, r;
|
|
|
|
for (i = 0; i < hdev->nvqs; ++i) {
|
|
r = vdev->binding->set_host_notifier(vdev->binding_opaque, i, false);
|
|
if (r < 0) {
|
|
fprintf(stderr, "vhost VQ %d notifier cleanup failed: %d\n", i, -r);
|
|
fflush(stderr);
|
|
}
|
|
assert (r >= 0);
|
|
}
|
|
}
|
|
|
|
/* Host notifiers must be enabled at this point. */
|
|
int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev)
|
|
{
|
|
int i, r;
|
|
if (!vdev->binding->set_guest_notifiers) {
|
|
fprintf(stderr, "binding does not support guest notifiers\n");
|
|
r = -ENOSYS;
|
|
goto fail;
|
|
}
|
|
|
|
r = vdev->binding->set_guest_notifiers(vdev->binding_opaque, true);
|
|
if (r < 0) {
|
|
fprintf(stderr, "Error binding guest notifier: %d\n", -r);
|
|
goto fail_notifiers;
|
|
}
|
|
|
|
r = vhost_dev_set_features(hdev, hdev->log_enabled);
|
|
if (r < 0) {
|
|
goto fail_features;
|
|
}
|
|
r = ioctl(hdev->control, VHOST_SET_MEM_TABLE, hdev->mem);
|
|
if (r < 0) {
|
|
r = -errno;
|
|
goto fail_mem;
|
|
}
|
|
for (i = 0; i < hdev->nvqs; ++i) {
|
|
r = vhost_virtqueue_init(hdev,
|
|
vdev,
|
|
hdev->vqs + i,
|
|
i);
|
|
if (r < 0) {
|
|
goto fail_vq;
|
|
}
|
|
}
|
|
|
|
if (hdev->log_enabled) {
|
|
hdev->log_size = vhost_get_log_size(hdev);
|
|
hdev->log = hdev->log_size ?
|
|
g_malloc0(hdev->log_size * sizeof *hdev->log) : NULL;
|
|
r = ioctl(hdev->control, VHOST_SET_LOG_BASE,
|
|
(uint64_t)(unsigned long)hdev->log);
|
|
if (r < 0) {
|
|
r = -errno;
|
|
goto fail_log;
|
|
}
|
|
}
|
|
|
|
hdev->started = true;
|
|
|
|
return 0;
|
|
fail_log:
|
|
fail_vq:
|
|
while (--i >= 0) {
|
|
vhost_virtqueue_cleanup(hdev,
|
|
vdev,
|
|
hdev->vqs + i,
|
|
i);
|
|
}
|
|
fail_mem:
|
|
fail_features:
|
|
vdev->binding->set_guest_notifiers(vdev->binding_opaque, false);
|
|
fail_notifiers:
|
|
fail:
|
|
return r;
|
|
}
|
|
|
|
/* Host notifiers must be enabled at this point. */
|
|
void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev)
|
|
{
|
|
int i, r;
|
|
|
|
for (i = 0; i < hdev->nvqs; ++i) {
|
|
vhost_virtqueue_cleanup(hdev,
|
|
vdev,
|
|
hdev->vqs + i,
|
|
i);
|
|
}
|
|
for (i = 0; i < hdev->n_mem_sections; ++i) {
|
|
vhost_sync_dirty_bitmap(hdev, &hdev->mem_sections[i],
|
|
0, (hwaddr)~0x0ull);
|
|
}
|
|
r = vdev->binding->set_guest_notifiers(vdev->binding_opaque, false);
|
|
if (r < 0) {
|
|
fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
|
|
fflush(stderr);
|
|
}
|
|
assert (r >= 0);
|
|
|
|
hdev->started = false;
|
|
g_free(hdev->log);
|
|
hdev->log = NULL;
|
|
hdev->log_size = 0;
|
|
}
|