1429 lines
43 KiB
C
1429 lines
43 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 "qemu/osdep.h"
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#include "qapi/error.h"
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#include "hw/virtio/vhost.h"
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#include "hw/hw.h"
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#include "qemu/atomic.h"
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#include "qemu/range.h"
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#include "qemu/error-report.h"
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#include "qemu/memfd.h"
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#include <linux/vhost.h>
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#include "exec/address-spaces.h"
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#include "hw/virtio/virtio-bus.h"
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#include "hw/virtio/virtio-access.h"
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#include "migration/migration.h"
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/* enabled until disconnected backend stabilizes */
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#define _VHOST_DEBUG 1
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#ifdef _VHOST_DEBUG
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#define VHOST_OPS_DEBUG(fmt, ...) \
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do { error_report(fmt ": %s (%d)", ## __VA_ARGS__, \
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strerror(errno), errno); } while (0)
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#else
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#define VHOST_OPS_DEBUG(fmt, ...) \
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do { } while (0)
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#endif
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static struct vhost_log *vhost_log;
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static struct vhost_log *vhost_log_shm;
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static unsigned int used_memslots;
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static QLIST_HEAD(, vhost_dev) vhost_devices =
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QLIST_HEAD_INITIALIZER(vhost_devices);
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bool vhost_has_free_slot(void)
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{
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unsigned int slots_limit = ~0U;
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struct vhost_dev *hdev;
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QLIST_FOREACH(hdev, &vhost_devices, entry) {
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unsigned int r = hdev->vhost_ops->vhost_backend_memslots_limit(hdev);
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slots_limit = MIN(slots_limit, r);
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}
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return slots_limit > used_memslots;
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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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vhost_log_chunk_t *log = dev->log->log;
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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 = log + start / VHOST_LOG_CHUNK;
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vhost_log_chunk_t *to = 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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/* 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 need barrier semantics
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* but it's easier to use atomic_* than roll our own. */
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log = atomic_xchg(from, 0);
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while (log) {
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int bit = ctzl(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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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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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, int128_get64(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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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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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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/* 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 (dev->vhost_ops->vhost_backend_can_merge &&
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!dev->vhost_ops->vhost_backend_can_merge(dev, uaddr, size,
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reg->userspace_addr,
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reg->memory_size)) {
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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 struct vhost_log *vhost_log_alloc(uint64_t size, bool share)
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{
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struct vhost_log *log;
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uint64_t logsize = size * sizeof(*(log->log));
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int fd = -1;
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log = g_new0(struct vhost_log, 1);
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if (share) {
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log->log = qemu_memfd_alloc("vhost-log", logsize,
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F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL,
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&fd);
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memset(log->log, 0, logsize);
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} else {
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log->log = g_malloc0(logsize);
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}
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log->size = size;
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log->refcnt = 1;
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log->fd = fd;
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return log;
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}
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static struct vhost_log *vhost_log_get(uint64_t size, bool share)
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{
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struct vhost_log *log = share ? vhost_log_shm : vhost_log;
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if (!log || log->size != size) {
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log = vhost_log_alloc(size, share);
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if (share) {
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vhost_log_shm = log;
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} else {
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vhost_log = log;
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}
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} else {
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++log->refcnt;
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}
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return log;
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}
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static void vhost_log_put(struct vhost_dev *dev, bool sync)
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{
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struct vhost_log *log = dev->log;
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if (!log) {
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return;
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}
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dev->log = NULL;
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dev->log_size = 0;
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--log->refcnt;
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if (log->refcnt == 0) {
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/* Sync only the range covered by the old log */
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if (dev->log_size && sync) {
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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 (vhost_log == log) {
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g_free(log->log);
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vhost_log = NULL;
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} else if (vhost_log_shm == log) {
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qemu_memfd_free(log->log, log->size * sizeof(*(log->log)),
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log->fd);
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vhost_log_shm = NULL;
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}
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g_free(log);
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}
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}
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static bool vhost_dev_log_is_shared(struct vhost_dev *dev)
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{
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return dev->vhost_ops->vhost_requires_shm_log &&
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dev->vhost_ops->vhost_requires_shm_log(dev);
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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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struct vhost_log *log = vhost_log_get(size, vhost_dev_log_is_shared(dev));
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uint64_t log_base = (uintptr_t)log->log;
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int r;
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/* inform backend of log switching, this must be done before
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releasing the current log, to ensure no logging is lost */
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r = dev->vhost_ops->vhost_set_log_base(dev, log_base, log);
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if (r < 0) {
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VHOST_OPS_DEBUG("vhost_set_log_base failed");
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}
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vhost_log_put(dev, true);
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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_part_mapping(void *part,
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uint64_t part_addr,
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uint64_t part_size,
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uint64_t start_addr,
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uint64_t size)
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{
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hwaddr l;
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void *p;
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int r = 0;
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if (!ranges_overlap(start_addr, size, part_addr, part_size)) {
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return 0;
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}
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l = part_size;
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p = cpu_physical_memory_map(part_addr, &l, 1);
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if (!p || l != part_size) {
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r = -ENOMEM;
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}
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if (p != part) {
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r = -EBUSY;
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}
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cpu_physical_memory_unmap(p, l, 0, 0);
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return r;
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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, j;
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int r = 0;
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const char *part_name[] = {
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"descriptor table",
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"available ring",
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"used ring"
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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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j = 0;
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r = vhost_verify_ring_part_mapping(vq->desc, vq->desc_phys,
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vq->desc_size, start_addr, size);
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if (!r) {
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break;
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}
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j++;
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r = vhost_verify_ring_part_mapping(vq->avail, vq->avail_phys,
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vq->avail_size, start_addr, size);
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if (!r) {
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break;
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}
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j++;
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r = vhost_verify_ring_part_mapping(vq->used, vq->used_phys,
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vq->used_size, start_addr, size);
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if (!r) {
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break;
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}
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}
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if (r == -ENOMEM) {
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error_report("Unable to map %s for ring %d", part_name[j], i);
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} else if (r == -EBUSY) {
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error_report("%s relocated for ring %d", part_name[j], i);
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}
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return r;
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}
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|
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static struct vhost_memory_region *vhost_dev_find_reg(struct vhost_dev *dev,
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uint64_t start_addr,
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uint64_t size)
|
|
{
|
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int i, n = dev->mem->nregions;
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for (i = 0; i < n; ++i) {
|
|
struct vhost_memory_region *reg = dev->mem->regions + i;
|
|
if (ranges_overlap(reg->guest_phys_addr, reg->memory_size,
|
|
start_addr, size)) {
|
|
return reg;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static bool vhost_dev_cmp_memory(struct vhost_dev *dev,
|
|
uint64_t start_addr,
|
|
uint64_t size,
|
|
uint64_t uaddr)
|
|
{
|
|
struct vhost_memory_region *reg = vhost_dev_find_reg(dev, start_addr, size);
|
|
uint64_t reglast;
|
|
uint64_t memlast;
|
|
|
|
if (!reg) {
|
|
return true;
|
|
}
|
|
|
|
reglast = range_get_last(reg->guest_phys_addr, reg->memory_size);
|
|
memlast = range_get_last(start_addr, size);
|
|
|
|
/* Need to extend region? */
|
|
if (start_addr < reg->guest_phys_addr || memlast > reglast) {
|
|
return true;
|
|
}
|
|
/* userspace_addr changed? */
|
|
return uaddr != reg->userspace_addr + start_addr - reg->guest_phys_addr;
|
|
}
|
|
|
|
static void vhost_set_memory(MemoryListener *listener,
|
|
MemoryRegionSection *section,
|
|
bool add)
|
|
{
|
|
struct vhost_dev *dev = container_of(listener, struct vhost_dev,
|
|
memory_listener);
|
|
hwaddr start_addr = section->offset_within_address_space;
|
|
ram_addr_t size = int128_get64(section->size);
|
|
bool log_dirty =
|
|
memory_region_get_dirty_log_mask(section->mr) & ~(1 << DIRTY_MEMORY_MIGRATION);
|
|
int s = offsetof(struct vhost_memory, regions) +
|
|
(dev->mem->nregions + 1) * sizeof dev->mem->regions[0];
|
|
void *ram;
|
|
|
|
dev->mem = g_realloc(dev->mem, s);
|
|
|
|
if (log_dirty) {
|
|
add = false;
|
|
}
|
|
|
|
assert(size);
|
|
|
|
/* Optimize no-change case. At least cirrus_vga does this a lot at this time. */
|
|
ram = memory_region_get_ram_ptr(section->mr) + section->offset_within_region;
|
|
if (add) {
|
|
if (!vhost_dev_cmp_memory(dev, start_addr, size, (uintptr_t)ram)) {
|
|
/* Region exists with same address. Nothing to do. */
|
|
return;
|
|
}
|
|
} else {
|
|
if (!vhost_dev_find_reg(dev, start_addr, size)) {
|
|
/* Removing region that we don't access. Nothing to do. */
|
|
return;
|
|
}
|
|
}
|
|
|
|
vhost_dev_unassign_memory(dev, start_addr, size);
|
|
if (add) {
|
|
/* Add given mapping, merging adjacent regions if any */
|
|
vhost_dev_assign_memory(dev, start_addr, size, (uintptr_t)ram);
|
|
} else {
|
|
/* Remove old mapping for this memory, if any. */
|
|
vhost_dev_unassign_memory(dev, start_addr, size);
|
|
}
|
|
dev->mem_changed_start_addr = MIN(dev->mem_changed_start_addr, start_addr);
|
|
dev->mem_changed_end_addr = MAX(dev->mem_changed_end_addr, start_addr + size - 1);
|
|
dev->memory_changed = true;
|
|
used_memslots = dev->mem->nregions;
|
|
}
|
|
|
|
static bool vhost_section(MemoryRegionSection *section)
|
|
{
|
|
return memory_region_is_ram(section->mr);
|
|
}
|
|
|
|
static void vhost_begin(MemoryListener *listener)
|
|
{
|
|
struct vhost_dev *dev = container_of(listener, struct vhost_dev,
|
|
memory_listener);
|
|
dev->mem_changed_end_addr = 0;
|
|
dev->mem_changed_start_addr = -1;
|
|
}
|
|
|
|
static void vhost_commit(MemoryListener *listener)
|
|
{
|
|
struct vhost_dev *dev = container_of(listener, struct vhost_dev,
|
|
memory_listener);
|
|
hwaddr start_addr = 0;
|
|
ram_addr_t size = 0;
|
|
uint64_t log_size;
|
|
int r;
|
|
|
|
if (!dev->memory_changed) {
|
|
return;
|
|
}
|
|
if (!dev->started) {
|
|
return;
|
|
}
|
|
if (dev->mem_changed_start_addr > dev->mem_changed_end_addr) {
|
|
return;
|
|
}
|
|
|
|
if (dev->started) {
|
|
start_addr = dev->mem_changed_start_addr;
|
|
size = dev->mem_changed_end_addr - dev->mem_changed_start_addr + 1;
|
|
|
|
r = vhost_verify_ring_mappings(dev, start_addr, size);
|
|
assert(r >= 0);
|
|
}
|
|
|
|
if (!dev->log_enabled) {
|
|
r = dev->vhost_ops->vhost_set_mem_table(dev, dev->mem);
|
|
if (r < 0) {
|
|
VHOST_OPS_DEBUG("vhost_set_mem_table failed");
|
|
}
|
|
dev->memory_changed = false;
|
|
return;
|
|
}
|
|
log_size = vhost_get_log_size(dev);
|
|
/* We allocate an extra 4K bytes to log,
|
|
* to reduce the * number of reallocations. */
|
|
#define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log)
|
|
/* To log more, must increase log size before table update. */
|
|
if (dev->log_size < log_size) {
|
|
vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER);
|
|
}
|
|
r = dev->vhost_ops->vhost_set_mem_table(dev, dev->mem);
|
|
if (r < 0) {
|
|
VHOST_OPS_DEBUG("vhost_set_mem_table failed");
|
|
}
|
|
/* To log less, can only decrease log size after table update. */
|
|
if (dev->log_size > log_size + VHOST_LOG_BUFFER) {
|
|
vhost_dev_log_resize(dev, log_size);
|
|
}
|
|
dev->memory_changed = false;
|
|
}
|
|
|
|
static void vhost_region_add(MemoryListener *listener,
|
|
MemoryRegionSection *section)
|
|
{
|
|
struct vhost_dev *dev = container_of(listener, struct vhost_dev,
|
|
memory_listener);
|
|
|
|
if (!vhost_section(section)) {
|
|
return;
|
|
}
|
|
|
|
++dev->n_mem_sections;
|
|
dev->mem_sections = g_renew(MemoryRegionSection, dev->mem_sections,
|
|
dev->n_mem_sections);
|
|
dev->mem_sections[dev->n_mem_sections - 1] = *section;
|
|
memory_region_ref(section->mr);
|
|
vhost_set_memory(listener, section, true);
|
|
}
|
|
|
|
static void vhost_region_del(MemoryListener *listener,
|
|
MemoryRegionSection *section)
|
|
{
|
|
struct vhost_dev *dev = container_of(listener, struct vhost_dev,
|
|
memory_listener);
|
|
int i;
|
|
|
|
if (!vhost_section(section)) {
|
|
return;
|
|
}
|
|
|
|
vhost_set_memory(listener, section, false);
|
|
memory_region_unref(section->mr);
|
|
for (i = 0; i < dev->n_mem_sections; ++i) {
|
|
if (dev->mem_sections[i].offset_within_address_space
|
|
== section->offset_within_address_space) {
|
|
--dev->n_mem_sections;
|
|
memmove(&dev->mem_sections[i], &dev->mem_sections[i+1],
|
|
(dev->n_mem_sections - i) * sizeof(*dev->mem_sections));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void vhost_region_nop(MemoryListener *listener,
|
|
MemoryRegionSection *section)
|
|
{
|
|
}
|
|
|
|
static int vhost_virtqueue_set_addr(struct vhost_dev *dev,
|
|
struct vhost_virtqueue *vq,
|
|
unsigned idx, bool enable_log)
|
|
{
|
|
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 = dev->vhost_ops->vhost_set_vring_addr(dev, &addr);
|
|
if (r < 0) {
|
|
VHOST_OPS_DEBUG("vhost_set_vring_addr failed");
|
|
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 |= 0x1ULL << VHOST_F_LOG_ALL;
|
|
}
|
|
r = dev->vhost_ops->vhost_set_features(dev, features);
|
|
if (r < 0) {
|
|
VHOST_OPS_DEBUG("vhost_set_features failed");
|
|
}
|
|
return r < 0 ? -errno : 0;
|
|
}
|
|
|
|
static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log)
|
|
{
|
|
int r, i, idx;
|
|
r = vhost_dev_set_features(dev, enable_log);
|
|
if (r < 0) {
|
|
goto err_features;
|
|
}
|
|
for (i = 0; i < dev->nvqs; ++i) {
|
|
idx = dev->vhost_ops->vhost_get_vq_index(dev, dev->vq_index + i);
|
|
r = vhost_virtqueue_set_addr(dev, dev->vqs + i, idx,
|
|
enable_log);
|
|
if (r < 0) {
|
|
goto err_vq;
|
|
}
|
|
}
|
|
return 0;
|
|
err_vq:
|
|
for (; i >= 0; --i) {
|
|
idx = dev->vhost_ops->vhost_get_vq_index(dev, dev->vq_index + i);
|
|
vhost_virtqueue_set_addr(dev, dev->vqs + i, idx,
|
|
dev->log_enabled);
|
|
}
|
|
vhost_dev_set_features(dev, dev->log_enabled);
|
|
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;
|
|
}
|
|
vhost_log_put(dev, false);
|
|
} 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,
|
|
int old, int new)
|
|
{
|
|
/* FIXME: implement */
|
|
}
|
|
|
|
static void vhost_log_stop(MemoryListener *listener,
|
|
MemoryRegionSection *section,
|
|
int old, int new)
|
|
{
|
|
/* FIXME: implement */
|
|
}
|
|
|
|
/* The vhost driver natively knows how to handle the vrings of non
|
|
* cross-endian legacy devices and modern devices. Only legacy devices
|
|
* exposed to a bi-endian guest may require the vhost driver to use a
|
|
* specific endianness.
|
|
*/
|
|
static inline bool vhost_needs_vring_endian(VirtIODevice *vdev)
|
|
{
|
|
if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
|
|
return false;
|
|
}
|
|
#ifdef HOST_WORDS_BIGENDIAN
|
|
return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_LITTLE;
|
|
#else
|
|
return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG;
|
|
#endif
|
|
}
|
|
|
|
static int vhost_virtqueue_set_vring_endian_legacy(struct vhost_dev *dev,
|
|
bool is_big_endian,
|
|
int vhost_vq_index)
|
|
{
|
|
struct vhost_vring_state s = {
|
|
.index = vhost_vq_index,
|
|
.num = is_big_endian
|
|
};
|
|
|
|
if (!dev->vhost_ops->vhost_set_vring_endian(dev, &s)) {
|
|
return 0;
|
|
}
|
|
|
|
VHOST_OPS_DEBUG("vhost_set_vring_endian failed");
|
|
if (errno == ENOTTY) {
|
|
error_report("vhost does not support cross-endian");
|
|
return -ENOSYS;
|
|
}
|
|
|
|
return -errno;
|
|
}
|
|
|
|
static int vhost_virtqueue_start(struct vhost_dev *dev,
|
|
struct VirtIODevice *vdev,
|
|
struct vhost_virtqueue *vq,
|
|
unsigned idx)
|
|
{
|
|
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
|
|
VirtioBusState *vbus = VIRTIO_BUS(qbus);
|
|
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
|
|
hwaddr s, l, a;
|
|
int r;
|
|
int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx);
|
|
struct vhost_vring_file file = {
|
|
.index = vhost_vq_index
|
|
};
|
|
struct vhost_vring_state state = {
|
|
.index = vhost_vq_index
|
|
};
|
|
struct VirtQueue *vvq = virtio_get_queue(vdev, idx);
|
|
|
|
|
|
vq->num = state.num = virtio_queue_get_num(vdev, idx);
|
|
r = dev->vhost_ops->vhost_set_vring_num(dev, &state);
|
|
if (r) {
|
|
VHOST_OPS_DEBUG("vhost_set_vring_num failed");
|
|
return -errno;
|
|
}
|
|
|
|
state.num = virtio_queue_get_last_avail_idx(vdev, idx);
|
|
r = dev->vhost_ops->vhost_set_vring_base(dev, &state);
|
|
if (r) {
|
|
VHOST_OPS_DEBUG("vhost_set_vring_base failed");
|
|
return -errno;
|
|
}
|
|
|
|
if (vhost_needs_vring_endian(vdev)) {
|
|
r = vhost_virtqueue_set_vring_endian_legacy(dev,
|
|
virtio_is_big_endian(vdev),
|
|
vhost_vq_index);
|
|
if (r) {
|
|
return -errno;
|
|
}
|
|
}
|
|
|
|
vq->desc_size = s = l = virtio_queue_get_desc_size(vdev, idx);
|
|
vq->desc_phys = 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;
|
|
}
|
|
vq->avail_size = s = l = virtio_queue_get_avail_size(vdev, idx);
|
|
vq->avail_phys = 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;
|
|
}
|
|
|
|
r = vhost_virtqueue_set_addr(dev, vq, vhost_vq_index, dev->log_enabled);
|
|
if (r < 0) {
|
|
r = -errno;
|
|
goto fail_alloc;
|
|
}
|
|
|
|
file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq));
|
|
r = dev->vhost_ops->vhost_set_vring_kick(dev, &file);
|
|
if (r) {
|
|
VHOST_OPS_DEBUG("vhost_set_vring_kick failed");
|
|
r = -errno;
|
|
goto fail_kick;
|
|
}
|
|
|
|
/* Clear and discard previous events if any. */
|
|
event_notifier_test_and_clear(&vq->masked_notifier);
|
|
|
|
/* Init vring in unmasked state, unless guest_notifier_mask
|
|
* will do it later.
|
|
*/
|
|
if (!vdev->use_guest_notifier_mask) {
|
|
/* TODO: check and handle errors. */
|
|
vhost_virtqueue_mask(dev, vdev, idx, false);
|
|
}
|
|
|
|
if (k->query_guest_notifiers &&
|
|
k->query_guest_notifiers(qbus->parent) &&
|
|
virtio_queue_vector(vdev, idx) == VIRTIO_NO_VECTOR) {
|
|
file.fd = -1;
|
|
r = dev->vhost_ops->vhost_set_vring_call(dev, &file);
|
|
if (r) {
|
|
goto fail_vector;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail_vector:
|
|
fail_kick:
|
|
fail_alloc:
|
|
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_stop(struct vhost_dev *dev,
|
|
struct VirtIODevice *vdev,
|
|
struct vhost_virtqueue *vq,
|
|
unsigned idx)
|
|
{
|
|
int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx);
|
|
struct vhost_vring_state state = {
|
|
.index = vhost_vq_index,
|
|
};
|
|
int r;
|
|
|
|
r = dev->vhost_ops->vhost_get_vring_base(dev, &state);
|
|
if (r < 0) {
|
|
VHOST_OPS_DEBUG("vhost VQ %d ring restore failed: %d", idx, r);
|
|
} else {
|
|
virtio_queue_set_last_avail_idx(vdev, idx, state.num);
|
|
}
|
|
virtio_queue_invalidate_signalled_used(vdev, idx);
|
|
virtio_queue_update_used_idx(vdev, idx);
|
|
|
|
/* In the cross-endian case, we need to reset the vring endianness to
|
|
* native as legacy devices expect so by default.
|
|
*/
|
|
if (vhost_needs_vring_endian(vdev)) {
|
|
vhost_virtqueue_set_vring_endian_legacy(dev,
|
|
!virtio_is_big_endian(vdev),
|
|
vhost_vq_index);
|
|
}
|
|
|
|
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)
|
|
{
|
|
}
|
|
|
|
static int vhost_virtqueue_set_busyloop_timeout(struct vhost_dev *dev,
|
|
int n, uint32_t timeout)
|
|
{
|
|
int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, n);
|
|
struct vhost_vring_state state = {
|
|
.index = vhost_vq_index,
|
|
.num = timeout,
|
|
};
|
|
int r;
|
|
|
|
if (!dev->vhost_ops->vhost_set_vring_busyloop_timeout) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
r = dev->vhost_ops->vhost_set_vring_busyloop_timeout(dev, &state);
|
|
if (r) {
|
|
VHOST_OPS_DEBUG("vhost_set_vring_busyloop_timeout failed");
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_virtqueue_init(struct vhost_dev *dev,
|
|
struct vhost_virtqueue *vq, int n)
|
|
{
|
|
int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, n);
|
|
struct vhost_vring_file file = {
|
|
.index = vhost_vq_index,
|
|
};
|
|
int r = event_notifier_init(&vq->masked_notifier, 0);
|
|
if (r < 0) {
|
|
return r;
|
|
}
|
|
|
|
file.fd = event_notifier_get_fd(&vq->masked_notifier);
|
|
r = dev->vhost_ops->vhost_set_vring_call(dev, &file);
|
|
if (r) {
|
|
VHOST_OPS_DEBUG("vhost_set_vring_call failed");
|
|
r = -errno;
|
|
goto fail_call;
|
|
}
|
|
return 0;
|
|
fail_call:
|
|
event_notifier_cleanup(&vq->masked_notifier);
|
|
return r;
|
|
}
|
|
|
|
static void vhost_virtqueue_cleanup(struct vhost_virtqueue *vq)
|
|
{
|
|
event_notifier_cleanup(&vq->masked_notifier);
|
|
}
|
|
|
|
int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
|
|
VhostBackendType backend_type, uint32_t busyloop_timeout)
|
|
{
|
|
uint64_t features;
|
|
int i, r, n_initialized_vqs = 0;
|
|
|
|
hdev->migration_blocker = NULL;
|
|
|
|
r = vhost_set_backend_type(hdev, backend_type);
|
|
assert(r >= 0);
|
|
|
|
r = hdev->vhost_ops->vhost_backend_init(hdev, opaque);
|
|
if (r < 0) {
|
|
goto fail;
|
|
}
|
|
|
|
if (used_memslots > hdev->vhost_ops->vhost_backend_memslots_limit(hdev)) {
|
|
error_report("vhost backend memory slots limit is less"
|
|
" than current number of present memory slots");
|
|
r = -1;
|
|
goto fail;
|
|
}
|
|
|
|
r = hdev->vhost_ops->vhost_set_owner(hdev);
|
|
if (r < 0) {
|
|
VHOST_OPS_DEBUG("vhost_set_owner failed");
|
|
goto fail;
|
|
}
|
|
|
|
r = hdev->vhost_ops->vhost_get_features(hdev, &features);
|
|
if (r < 0) {
|
|
VHOST_OPS_DEBUG("vhost_get_features failed");
|
|
goto fail;
|
|
}
|
|
|
|
for (i = 0; i < hdev->nvqs; ++i, ++n_initialized_vqs) {
|
|
r = vhost_virtqueue_init(hdev, hdev->vqs + i, hdev->vq_index + i);
|
|
if (r < 0) {
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
if (busyloop_timeout) {
|
|
for (i = 0; i < hdev->nvqs; ++i) {
|
|
r = vhost_virtqueue_set_busyloop_timeout(hdev, hdev->vq_index + i,
|
|
busyloop_timeout);
|
|
if (r < 0) {
|
|
goto fail_busyloop;
|
|
}
|
|
}
|
|
}
|
|
|
|
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
|
|
};
|
|
|
|
if (hdev->migration_blocker == NULL) {
|
|
if (!(hdev->features & (0x1ULL << VHOST_F_LOG_ALL))) {
|
|
error_setg(&hdev->migration_blocker,
|
|
"Migration disabled: vhost lacks VHOST_F_LOG_ALL feature.");
|
|
} else if (vhost_dev_log_is_shared(hdev) && !qemu_memfd_check()) {
|
|
error_setg(&hdev->migration_blocker,
|
|
"Migration disabled: failed to allocate shared memory");
|
|
}
|
|
}
|
|
|
|
if (hdev->migration_blocker != NULL) {
|
|
migrate_add_blocker(hdev->migration_blocker);
|
|
}
|
|
|
|
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;
|
|
hdev->memory_changed = false;
|
|
memory_listener_register(&hdev->memory_listener, &address_space_memory);
|
|
QLIST_INSERT_HEAD(&vhost_devices, hdev, entry);
|
|
return 0;
|
|
|
|
fail_busyloop:
|
|
while (--i >= 0) {
|
|
vhost_virtqueue_set_busyloop_timeout(hdev, hdev->vq_index + i, 0);
|
|
}
|
|
fail:
|
|
hdev->nvqs = n_initialized_vqs;
|
|
vhost_dev_cleanup(hdev);
|
|
return r;
|
|
}
|
|
|
|
void vhost_dev_cleanup(struct vhost_dev *hdev)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < hdev->nvqs; ++i) {
|
|
vhost_virtqueue_cleanup(hdev->vqs + i);
|
|
}
|
|
if (hdev->mem) {
|
|
/* those are only safe after successful init */
|
|
memory_listener_unregister(&hdev->memory_listener);
|
|
QLIST_REMOVE(hdev, entry);
|
|
}
|
|
if (hdev->migration_blocker) {
|
|
migrate_del_blocker(hdev->migration_blocker);
|
|
error_free(hdev->migration_blocker);
|
|
}
|
|
g_free(hdev->mem);
|
|
g_free(hdev->mem_sections);
|
|
if (hdev->vhost_ops) {
|
|
hdev->vhost_ops->vhost_backend_cleanup(hdev);
|
|
}
|
|
assert(!hdev->log);
|
|
|
|
memset(hdev, 0, sizeof(struct vhost_dev));
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
|
|
int i, r, e;
|
|
|
|
/* We will pass the notifiers to the kernel, make sure that QEMU
|
|
* doesn't interfere.
|
|
*/
|
|
r = virtio_device_grab_ioeventfd(vdev);
|
|
if (r < 0) {
|
|
error_report("binding does not support host notifiers");
|
|
goto fail;
|
|
}
|
|
|
|
for (i = 0; i < hdev->nvqs; ++i) {
|
|
r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i,
|
|
true);
|
|
if (r < 0) {
|
|
error_report("vhost VQ %d notifier binding failed: %d", i, -r);
|
|
goto fail_vq;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
fail_vq:
|
|
while (--i >= 0) {
|
|
e = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i,
|
|
false);
|
|
if (e < 0) {
|
|
error_report("vhost VQ %d notifier cleanup error: %d", i, -r);
|
|
}
|
|
assert (e >= 0);
|
|
}
|
|
virtio_device_release_ioeventfd(vdev);
|
|
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)
|
|
{
|
|
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
|
|
int i, r;
|
|
|
|
for (i = 0; i < hdev->nvqs; ++i) {
|
|
r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i,
|
|
false);
|
|
if (r < 0) {
|
|
error_report("vhost VQ %d notifier cleanup failed: %d", i, -r);
|
|
}
|
|
assert (r >= 0);
|
|
}
|
|
virtio_device_release_ioeventfd(vdev);
|
|
}
|
|
|
|
/* Test and clear event pending status.
|
|
* Should be called after unmask to avoid losing events.
|
|
*/
|
|
bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n)
|
|
{
|
|
struct vhost_virtqueue *vq = hdev->vqs + n - hdev->vq_index;
|
|
assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs);
|
|
return event_notifier_test_and_clear(&vq->masked_notifier);
|
|
}
|
|
|
|
/* Mask/unmask events from this vq. */
|
|
void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,
|
|
bool mask)
|
|
{
|
|
struct VirtQueue *vvq = virtio_get_queue(vdev, n);
|
|
int r, index = n - hdev->vq_index;
|
|
struct vhost_vring_file file;
|
|
|
|
/* should only be called after backend is connected */
|
|
assert(hdev->vhost_ops);
|
|
|
|
if (mask) {
|
|
assert(vdev->use_guest_notifier_mask);
|
|
file.fd = event_notifier_get_fd(&hdev->vqs[index].masked_notifier);
|
|
} else {
|
|
file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq));
|
|
}
|
|
|
|
file.index = hdev->vhost_ops->vhost_get_vq_index(hdev, n);
|
|
r = hdev->vhost_ops->vhost_set_vring_call(hdev, &file);
|
|
if (r < 0) {
|
|
VHOST_OPS_DEBUG("vhost_set_vring_call failed");
|
|
}
|
|
}
|
|
|
|
uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits,
|
|
uint64_t features)
|
|
{
|
|
const int *bit = feature_bits;
|
|
while (*bit != VHOST_INVALID_FEATURE_BIT) {
|
|
uint64_t bit_mask = (1ULL << *bit);
|
|
if (!(hdev->features & bit_mask)) {
|
|
features &= ~bit_mask;
|
|
}
|
|
bit++;
|
|
}
|
|
return features;
|
|
}
|
|
|
|
void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits,
|
|
uint64_t features)
|
|
{
|
|
const int *bit = feature_bits;
|
|
while (*bit != VHOST_INVALID_FEATURE_BIT) {
|
|
uint64_t bit_mask = (1ULL << *bit);
|
|
if (features & bit_mask) {
|
|
hdev->acked_features |= bit_mask;
|
|
}
|
|
bit++;
|
|
}
|
|
}
|
|
|
|
/* Host notifiers must be enabled at this point. */
|
|
int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev)
|
|
{
|
|
int i, r;
|
|
|
|
/* should only be called after backend is connected */
|
|
assert(hdev->vhost_ops);
|
|
|
|
hdev->started = true;
|
|
|
|
r = vhost_dev_set_features(hdev, hdev->log_enabled);
|
|
if (r < 0) {
|
|
goto fail_features;
|
|
}
|
|
r = hdev->vhost_ops->vhost_set_mem_table(hdev, hdev->mem);
|
|
if (r < 0) {
|
|
VHOST_OPS_DEBUG("vhost_set_mem_table failed");
|
|
r = -errno;
|
|
goto fail_mem;
|
|
}
|
|
for (i = 0; i < hdev->nvqs; ++i) {
|
|
r = vhost_virtqueue_start(hdev,
|
|
vdev,
|
|
hdev->vqs + i,
|
|
hdev->vq_index + i);
|
|
if (r < 0) {
|
|
goto fail_vq;
|
|
}
|
|
}
|
|
|
|
if (hdev->log_enabled) {
|
|
uint64_t log_base;
|
|
|
|
hdev->log_size = vhost_get_log_size(hdev);
|
|
hdev->log = vhost_log_get(hdev->log_size,
|
|
vhost_dev_log_is_shared(hdev));
|
|
log_base = (uintptr_t)hdev->log->log;
|
|
r = hdev->vhost_ops->vhost_set_log_base(hdev,
|
|
hdev->log_size ? log_base : 0,
|
|
hdev->log);
|
|
if (r < 0) {
|
|
VHOST_OPS_DEBUG("vhost_set_log_base failed");
|
|
r = -errno;
|
|
goto fail_log;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
fail_log:
|
|
vhost_log_put(hdev, false);
|
|
fail_vq:
|
|
while (--i >= 0) {
|
|
vhost_virtqueue_stop(hdev,
|
|
vdev,
|
|
hdev->vqs + i,
|
|
hdev->vq_index + i);
|
|
}
|
|
i = hdev->nvqs;
|
|
fail_mem:
|
|
fail_features:
|
|
|
|
hdev->started = false;
|
|
return r;
|
|
}
|
|
|
|
/* Host notifiers must be enabled at this point. */
|
|
void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev)
|
|
{
|
|
int i;
|
|
|
|
/* should only be called after backend is connected */
|
|
assert(hdev->vhost_ops);
|
|
|
|
for (i = 0; i < hdev->nvqs; ++i) {
|
|
vhost_virtqueue_stop(hdev,
|
|
vdev,
|
|
hdev->vqs + i,
|
|
hdev->vq_index + i);
|
|
}
|
|
|
|
vhost_log_put(hdev, true);
|
|
hdev->started = false;
|
|
}
|
|
|
|
int vhost_net_set_backend(struct vhost_dev *hdev,
|
|
struct vhost_vring_file *file)
|
|
{
|
|
if (hdev->vhost_ops->vhost_net_set_backend) {
|
|
return hdev->vhost_ops->vhost_net_set_backend(hdev, file);
|
|
}
|
|
|
|
return -1;
|
|
}
|