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1943 lines
59 KiB
C
1943 lines
59 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 "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 "standard-headers/linux/vhost_types.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/blocker.h"
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#include "migration/qemu-file-types.h"
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#include "sysemu/dma.h"
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#include "trace.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(retval, fmt, ...) \
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do { \
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error_report(fmt ": %s (%d)", ## __VA_ARGS__, \
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strerror(-retval), -retval); \
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} while (0)
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#else
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#define VHOST_OPS_DEBUG(retval, 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 = QEMU_ALIGN_DOWN(start, 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 = qatomic_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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if (!vq->used_phys && !vq->used_size) {
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continue;
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}
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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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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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return log_size;
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}
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static int vhost_set_backend_type(struct vhost_dev *dev,
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VhostBackendType backend_type)
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{
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int r = 0;
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switch (backend_type) {
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#ifdef CONFIG_VHOST_KERNEL
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case VHOST_BACKEND_TYPE_KERNEL:
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dev->vhost_ops = &kernel_ops;
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break;
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#endif
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#ifdef CONFIG_VHOST_USER
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case VHOST_BACKEND_TYPE_USER:
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dev->vhost_ops = &user_ops;
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break;
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#endif
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#ifdef CONFIG_VHOST_VDPA
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case VHOST_BACKEND_TYPE_VDPA:
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dev->vhost_ops = &vdpa_ops;
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break;
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#endif
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default:
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error_report("Unknown vhost backend type");
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r = -1;
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}
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return r;
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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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Error *err = NULL;
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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, &err);
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if (err) {
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error_report_err(err);
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g_free(log);
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return NULL;
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}
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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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--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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dev->log = NULL;
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dev->log_size = 0;
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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(r, "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 bool vhost_dev_has_iommu(struct vhost_dev *dev)
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{
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VirtIODevice *vdev = dev->vdev;
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/*
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* For vhost, VIRTIO_F_IOMMU_PLATFORM means the backend support
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* incremental memory mapping API via IOTLB API. For platform that
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* does not have IOMMU, there's no need to enable this feature
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* which may cause unnecessary IOTLB miss/update transactions.
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*/
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if (vdev) {
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return virtio_bus_device_iommu_enabled(vdev) &&
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virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM);
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} else {
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return false;
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}
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}
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static void *vhost_memory_map(struct vhost_dev *dev, hwaddr addr,
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hwaddr *plen, bool is_write)
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{
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if (!vhost_dev_has_iommu(dev)) {
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return cpu_physical_memory_map(addr, plen, is_write);
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} else {
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return (void *)(uintptr_t)addr;
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}
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}
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static void vhost_memory_unmap(struct vhost_dev *dev, void *buffer,
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hwaddr len, int is_write,
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hwaddr access_len)
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{
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if (!vhost_dev_has_iommu(dev)) {
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cpu_physical_memory_unmap(buffer, len, is_write, access_len);
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}
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}
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static int vhost_verify_ring_part_mapping(void *ring_hva,
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uint64_t ring_gpa,
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uint64_t ring_size,
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void *reg_hva,
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uint64_t reg_gpa,
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uint64_t reg_size)
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{
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uint64_t hva_ring_offset;
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uint64_t ring_last = range_get_last(ring_gpa, ring_size);
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uint64_t reg_last = range_get_last(reg_gpa, reg_size);
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if (ring_last < reg_gpa || ring_gpa > reg_last) {
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return 0;
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}
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/* check that whole ring's is mapped */
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if (ring_last > reg_last) {
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return -ENOMEM;
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}
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/* check that ring's MemoryRegion wasn't replaced */
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hva_ring_offset = ring_gpa - reg_gpa;
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if (ring_hva != reg_hva + hva_ring_offset) {
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return -EBUSY;
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}
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return 0;
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}
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static int vhost_verify_ring_mappings(struct vhost_dev *dev,
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void *reg_hva,
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uint64_t reg_gpa,
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uint64_t reg_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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if (vhost_dev_has_iommu(dev)) {
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return 0;
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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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if (vq->desc_phys == 0) {
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continue;
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}
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j = 0;
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r = vhost_verify_ring_part_mapping(
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vq->desc, vq->desc_phys, vq->desc_size,
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reg_hva, reg_gpa, reg_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(
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vq->avail, vq->avail_phys, vq->avail_size,
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reg_hva, reg_gpa, reg_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(
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vq->used, vq->used_phys, vq->used_size,
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reg_hva, reg_gpa, reg_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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* vhost_section: identify sections needed for vhost access
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*
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* We only care about RAM sections here (where virtqueue and guest
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* internals accessed by virtio might live). If we find one we still
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* allow the backend to potentially filter it out of our list.
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*/
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static bool vhost_section(struct vhost_dev *dev, MemoryRegionSection *section)
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{
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MemoryRegion *mr = section->mr;
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if (memory_region_is_ram(mr) && !memory_region_is_rom(mr)) {
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uint8_t dirty_mask = memory_region_get_dirty_log_mask(mr);
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uint8_t handled_dirty;
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/*
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* Kernel based vhost doesn't handle any block which is doing
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* dirty-tracking other than migration for which it has
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* specific logging support. However for TCG the kernel never
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* gets involved anyway so we can also ignore it's
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* self-modiying code detection flags. However a vhost-user
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* client could still confuse a TCG guest if it re-writes
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* executable memory that has already been translated.
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*/
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handled_dirty = (1 << DIRTY_MEMORY_MIGRATION) |
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(1 << DIRTY_MEMORY_CODE);
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if (dirty_mask & ~handled_dirty) {
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trace_vhost_reject_section(mr->name, 1);
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return false;
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}
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if (dev->vhost_ops->vhost_backend_mem_section_filter &&
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!dev->vhost_ops->vhost_backend_mem_section_filter(dev, section)) {
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trace_vhost_reject_section(mr->name, 2);
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return false;
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}
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trace_vhost_section(mr->name);
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return true;
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} else {
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trace_vhost_reject_section(mr->name, 3);
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return false;
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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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struct vhost_dev *dev = container_of(listener, struct vhost_dev,
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memory_listener);
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dev->tmp_sections = NULL;
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dev->n_tmp_sections = 0;
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}
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static void vhost_commit(MemoryListener *listener)
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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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MemoryRegionSection *old_sections;
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int n_old_sections;
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uint64_t log_size;
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size_t regions_size;
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int r;
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int i;
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bool changed = false;
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/* Note we can be called before the device is started, but then
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* starting the device calls set_mem_table, so we need to have
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* built the data structures.
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*/
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old_sections = dev->mem_sections;
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n_old_sections = dev->n_mem_sections;
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dev->mem_sections = dev->tmp_sections;
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dev->n_mem_sections = dev->n_tmp_sections;
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if (dev->n_mem_sections != n_old_sections) {
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changed = true;
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} else {
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/* Same size, lets check the contents */
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for (int i = 0; i < n_old_sections; i++) {
|
|
if (!MemoryRegionSection_eq(&old_sections[i],
|
|
&dev->mem_sections[i])) {
|
|
changed = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
trace_vhost_commit(dev->started, changed);
|
|
if (!changed) {
|
|
goto out;
|
|
}
|
|
|
|
/* Rebuild the regions list from the new sections list */
|
|
regions_size = offsetof(struct vhost_memory, regions) +
|
|
dev->n_mem_sections * sizeof dev->mem->regions[0];
|
|
dev->mem = g_realloc(dev->mem, regions_size);
|
|
dev->mem->nregions = dev->n_mem_sections;
|
|
used_memslots = dev->mem->nregions;
|
|
for (i = 0; i < dev->n_mem_sections; i++) {
|
|
struct vhost_memory_region *cur_vmr = dev->mem->regions + i;
|
|
struct MemoryRegionSection *mrs = dev->mem_sections + i;
|
|
|
|
cur_vmr->guest_phys_addr = mrs->offset_within_address_space;
|
|
cur_vmr->memory_size = int128_get64(mrs->size);
|
|
cur_vmr->userspace_addr =
|
|
(uintptr_t)memory_region_get_ram_ptr(mrs->mr) +
|
|
mrs->offset_within_region;
|
|
cur_vmr->flags_padding = 0;
|
|
}
|
|
|
|
if (!dev->started) {
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < dev->mem->nregions; i++) {
|
|
if (vhost_verify_ring_mappings(dev,
|
|
(void *)(uintptr_t)dev->mem->regions[i].userspace_addr,
|
|
dev->mem->regions[i].guest_phys_addr,
|
|
dev->mem->regions[i].memory_size)) {
|
|
error_report("Verify ring failure on region %d", i);
|
|
abort();
|
|
}
|
|
}
|
|
|
|
if (!dev->log_enabled) {
|
|
r = dev->vhost_ops->vhost_set_mem_table(dev, dev->mem);
|
|
if (r < 0) {
|
|
VHOST_OPS_DEBUG(r, "vhost_set_mem_table failed");
|
|
}
|
|
goto out;
|
|
}
|
|
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(r, "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);
|
|
}
|
|
|
|
out:
|
|
/* Deref the old list of sections, this must happen _after_ the
|
|
* vhost_set_mem_table to ensure the client isn't still using the
|
|
* section we're about to unref.
|
|
*/
|
|
while (n_old_sections--) {
|
|
memory_region_unref(old_sections[n_old_sections].mr);
|
|
}
|
|
g_free(old_sections);
|
|
return;
|
|
}
|
|
|
|
/* Adds the section data to the tmp_section structure.
|
|
* It relies on the listener calling us in memory address order
|
|
* and for each region (via the _add and _nop methods) to
|
|
* join neighbours.
|
|
*/
|
|
static void vhost_region_add_section(struct vhost_dev *dev,
|
|
MemoryRegionSection *section)
|
|
{
|
|
bool need_add = true;
|
|
uint64_t mrs_size = int128_get64(section->size);
|
|
uint64_t mrs_gpa = section->offset_within_address_space;
|
|
uintptr_t mrs_host = (uintptr_t)memory_region_get_ram_ptr(section->mr) +
|
|
section->offset_within_region;
|
|
RAMBlock *mrs_rb = section->mr->ram_block;
|
|
|
|
trace_vhost_region_add_section(section->mr->name, mrs_gpa, mrs_size,
|
|
mrs_host);
|
|
|
|
if (dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER) {
|
|
/* Round the section to it's page size */
|
|
/* First align the start down to a page boundary */
|
|
size_t mrs_page = qemu_ram_pagesize(mrs_rb);
|
|
uint64_t alignage = mrs_host & (mrs_page - 1);
|
|
if (alignage) {
|
|
mrs_host -= alignage;
|
|
mrs_size += alignage;
|
|
mrs_gpa -= alignage;
|
|
}
|
|
/* Now align the size up to a page boundary */
|
|
alignage = mrs_size & (mrs_page - 1);
|
|
if (alignage) {
|
|
mrs_size += mrs_page - alignage;
|
|
}
|
|
trace_vhost_region_add_section_aligned(section->mr->name, mrs_gpa,
|
|
mrs_size, mrs_host);
|
|
}
|
|
|
|
if (dev->n_tmp_sections) {
|
|
/* Since we already have at least one section, lets see if
|
|
* this extends it; since we're scanning in order, we only
|
|
* have to look at the last one, and the FlatView that calls
|
|
* us shouldn't have overlaps.
|
|
*/
|
|
MemoryRegionSection *prev_sec = dev->tmp_sections +
|
|
(dev->n_tmp_sections - 1);
|
|
uint64_t prev_gpa_start = prev_sec->offset_within_address_space;
|
|
uint64_t prev_size = int128_get64(prev_sec->size);
|
|
uint64_t prev_gpa_end = range_get_last(prev_gpa_start, prev_size);
|
|
uint64_t prev_host_start =
|
|
(uintptr_t)memory_region_get_ram_ptr(prev_sec->mr) +
|
|
prev_sec->offset_within_region;
|
|
uint64_t prev_host_end = range_get_last(prev_host_start, prev_size);
|
|
|
|
if (mrs_gpa <= (prev_gpa_end + 1)) {
|
|
/* OK, looks like overlapping/intersecting - it's possible that
|
|
* the rounding to page sizes has made them overlap, but they should
|
|
* match up in the same RAMBlock if they do.
|
|
*/
|
|
if (mrs_gpa < prev_gpa_start) {
|
|
error_report("%s:Section '%s' rounded to %"PRIx64
|
|
" prior to previous '%s' %"PRIx64,
|
|
__func__, section->mr->name, mrs_gpa,
|
|
prev_sec->mr->name, prev_gpa_start);
|
|
/* A way to cleanly fail here would be better */
|
|
return;
|
|
}
|
|
/* Offset from the start of the previous GPA to this GPA */
|
|
size_t offset = mrs_gpa - prev_gpa_start;
|
|
|
|
if (prev_host_start + offset == mrs_host &&
|
|
section->mr == prev_sec->mr &&
|
|
(!dev->vhost_ops->vhost_backend_can_merge ||
|
|
dev->vhost_ops->vhost_backend_can_merge(dev,
|
|
mrs_host, mrs_size,
|
|
prev_host_start, prev_size))) {
|
|
uint64_t max_end = MAX(prev_host_end, mrs_host + mrs_size);
|
|
need_add = false;
|
|
prev_sec->offset_within_address_space =
|
|
MIN(prev_gpa_start, mrs_gpa);
|
|
prev_sec->offset_within_region =
|
|
MIN(prev_host_start, mrs_host) -
|
|
(uintptr_t)memory_region_get_ram_ptr(prev_sec->mr);
|
|
prev_sec->size = int128_make64(max_end - MIN(prev_host_start,
|
|
mrs_host));
|
|
trace_vhost_region_add_section_merge(section->mr->name,
|
|
int128_get64(prev_sec->size),
|
|
prev_sec->offset_within_address_space,
|
|
prev_sec->offset_within_region);
|
|
} else {
|
|
/* adjoining regions are fine, but overlapping ones with
|
|
* different blocks/offsets shouldn't happen
|
|
*/
|
|
if (mrs_gpa != prev_gpa_end + 1) {
|
|
error_report("%s: Overlapping but not coherent sections "
|
|
"at %"PRIx64,
|
|
__func__, mrs_gpa);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (need_add) {
|
|
++dev->n_tmp_sections;
|
|
dev->tmp_sections = g_renew(MemoryRegionSection, dev->tmp_sections,
|
|
dev->n_tmp_sections);
|
|
dev->tmp_sections[dev->n_tmp_sections - 1] = *section;
|
|
/* The flatview isn't stable and we don't use it, making it NULL
|
|
* means we can memcmp the list.
|
|
*/
|
|
dev->tmp_sections[dev->n_tmp_sections - 1].fv = NULL;
|
|
memory_region_ref(section->mr);
|
|
}
|
|
}
|
|
|
|
/* Used for both add and nop callbacks */
|
|
static void vhost_region_addnop(MemoryListener *listener,
|
|
MemoryRegionSection *section)
|
|
{
|
|
struct vhost_dev *dev = container_of(listener, struct vhost_dev,
|
|
memory_listener);
|
|
|
|
if (!vhost_section(dev, section)) {
|
|
return;
|
|
}
|
|
vhost_region_add_section(dev, section);
|
|
}
|
|
|
|
static void vhost_iommu_unmap_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
|
|
{
|
|
struct vhost_iommu *iommu = container_of(n, struct vhost_iommu, n);
|
|
struct vhost_dev *hdev = iommu->hdev;
|
|
hwaddr iova = iotlb->iova + iommu->iommu_offset;
|
|
|
|
if (vhost_backend_invalidate_device_iotlb(hdev, iova,
|
|
iotlb->addr_mask + 1)) {
|
|
error_report("Fail to invalidate device iotlb");
|
|
}
|
|
}
|
|
|
|
static void vhost_iommu_region_add(MemoryListener *listener,
|
|
MemoryRegionSection *section)
|
|
{
|
|
struct vhost_dev *dev = container_of(listener, struct vhost_dev,
|
|
iommu_listener);
|
|
struct vhost_iommu *iommu;
|
|
Int128 end;
|
|
int iommu_idx;
|
|
IOMMUMemoryRegion *iommu_mr;
|
|
int ret;
|
|
|
|
if (!memory_region_is_iommu(section->mr)) {
|
|
return;
|
|
}
|
|
|
|
iommu_mr = IOMMU_MEMORY_REGION(section->mr);
|
|
|
|
iommu = g_malloc0(sizeof(*iommu));
|
|
end = int128_add(int128_make64(section->offset_within_region),
|
|
section->size);
|
|
end = int128_sub(end, int128_one());
|
|
iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr,
|
|
MEMTXATTRS_UNSPECIFIED);
|
|
iommu_notifier_init(&iommu->n, vhost_iommu_unmap_notify,
|
|
IOMMU_NOTIFIER_DEVIOTLB_UNMAP,
|
|
section->offset_within_region,
|
|
int128_get64(end),
|
|
iommu_idx);
|
|
iommu->mr = section->mr;
|
|
iommu->iommu_offset = section->offset_within_address_space -
|
|
section->offset_within_region;
|
|
iommu->hdev = dev;
|
|
ret = memory_region_register_iommu_notifier(section->mr, &iommu->n, NULL);
|
|
if (ret) {
|
|
/*
|
|
* Some vIOMMUs do not support dev-iotlb yet. If so, try to use the
|
|
* UNMAP legacy message
|
|
*/
|
|
iommu->n.notifier_flags = IOMMU_NOTIFIER_UNMAP;
|
|
memory_region_register_iommu_notifier(section->mr, &iommu->n,
|
|
&error_fatal);
|
|
}
|
|
QLIST_INSERT_HEAD(&dev->iommu_list, iommu, iommu_next);
|
|
/* TODO: can replay help performance here? */
|
|
}
|
|
|
|
static void vhost_iommu_region_del(MemoryListener *listener,
|
|
MemoryRegionSection *section)
|
|
{
|
|
struct vhost_dev *dev = container_of(listener, struct vhost_dev,
|
|
iommu_listener);
|
|
struct vhost_iommu *iommu;
|
|
|
|
if (!memory_region_is_iommu(section->mr)) {
|
|
return;
|
|
}
|
|
|
|
QLIST_FOREACH(iommu, &dev->iommu_list, iommu_next) {
|
|
if (iommu->mr == section->mr &&
|
|
iommu->n.start == section->offset_within_region) {
|
|
memory_region_unregister_iommu_notifier(iommu->mr,
|
|
&iommu->n);
|
|
QLIST_REMOVE(iommu, iommu_next);
|
|
g_free(iommu);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int vhost_virtqueue_set_addr(struct vhost_dev *dev,
|
|
struct vhost_virtqueue *vq,
|
|
unsigned idx, bool enable_log)
|
|
{
|
|
struct vhost_vring_addr addr;
|
|
int r;
|
|
memset(&addr, 0, sizeof(struct vhost_vring_addr));
|
|
|
|
if (dev->vhost_ops->vhost_vq_get_addr) {
|
|
r = dev->vhost_ops->vhost_vq_get_addr(dev, &addr, vq);
|
|
if (r < 0) {
|
|
VHOST_OPS_DEBUG(r, "vhost_vq_get_addr failed");
|
|
return r;
|
|
}
|
|
} else {
|
|
addr.desc_user_addr = (uint64_t)(unsigned long)vq->desc;
|
|
addr.avail_user_addr = (uint64_t)(unsigned long)vq->avail;
|
|
addr.used_user_addr = (uint64_t)(unsigned long)vq->used;
|
|
}
|
|
addr.index = idx;
|
|
addr.log_guest_addr = vq->used_phys;
|
|
addr.flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0;
|
|
r = dev->vhost_ops->vhost_set_vring_addr(dev, &addr);
|
|
if (r < 0) {
|
|
VHOST_OPS_DEBUG(r, "vhost_set_vring_addr failed");
|
|
}
|
|
return r;
|
|
}
|
|
|
|
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;
|
|
}
|
|
if (!vhost_dev_has_iommu(dev)) {
|
|
features &= ~(0x1ULL << VIRTIO_F_IOMMU_PLATFORM);
|
|
}
|
|
if (dev->vhost_ops->vhost_force_iommu) {
|
|
if (dev->vhost_ops->vhost_force_iommu(dev) == true) {
|
|
features |= 0x1ULL << VIRTIO_F_IOMMU_PLATFORM;
|
|
}
|
|
}
|
|
r = dev->vhost_ops->vhost_set_features(dev, features);
|
|
if (r < 0) {
|
|
VHOST_OPS_DEBUG(r, "vhost_set_features failed");
|
|
goto out;
|
|
}
|
|
if (dev->vhost_ops->vhost_set_backend_cap) {
|
|
r = dev->vhost_ops->vhost_set_backend_cap(dev);
|
|
if (r < 0) {
|
|
VHOST_OPS_DEBUG(r, "vhost_set_backend_cap failed");
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
return r;
|
|
}
|
|
|
|
static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log)
|
|
{
|
|
int r, i, idx;
|
|
hwaddr addr;
|
|
|
|
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);
|
|
addr = virtio_queue_get_desc_addr(dev->vdev, idx);
|
|
if (!addr) {
|
|
/*
|
|
* The queue might not be ready for start. If this
|
|
* is the case there is no reason to continue the process.
|
|
* The similar logic is used by the vhost_virtqueue_start()
|
|
* routine.
|
|
*/
|
|
continue;
|
|
}
|
|
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);
|
|
addr = virtio_queue_get_desc_addr(dev->vdev, idx);
|
|
if (!addr) {
|
|
continue;
|
|
}
|
|
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, bool 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;
|
|
}
|
|
|
|
r = 0;
|
|
if (!enable) {
|
|
r = vhost_dev_set_log(dev, false);
|
|
if (r < 0) {
|
|
goto check_dev_state;
|
|
}
|
|
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) {
|
|
goto check_dev_state;
|
|
}
|
|
}
|
|
|
|
check_dev_state:
|
|
dev->log_enabled = enable;
|
|
/*
|
|
* vhost-user-* devices could change their state during log
|
|
* initialization due to disconnect. So check dev state after
|
|
* vhost communication.
|
|
*/
|
|
if (!dev->started) {
|
|
/*
|
|
* Since device is in the stopped state, it is okay for
|
|
* migration. Return success.
|
|
*/
|
|
r = 0;
|
|
}
|
|
if (r) {
|
|
/* An error occurred. */
|
|
dev->log_enabled = false;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
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;
|
|
}
|
|
#if HOST_BIG_ENDIAN
|
|
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)
|
|
{
|
|
int r;
|
|
struct vhost_vring_state s = {
|
|
.index = vhost_vq_index,
|
|
.num = is_big_endian
|
|
};
|
|
|
|
r = dev->vhost_ops->vhost_set_vring_endian(dev, &s);
|
|
if (r < 0) {
|
|
VHOST_OPS_DEBUG(r, "vhost_set_vring_endian failed");
|
|
}
|
|
return r;
|
|
}
|
|
|
|
static int vhost_memory_region_lookup(struct vhost_dev *hdev,
|
|
uint64_t gpa, uint64_t *uaddr,
|
|
uint64_t *len)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < hdev->mem->nregions; i++) {
|
|
struct vhost_memory_region *reg = hdev->mem->regions + i;
|
|
|
|
if (gpa >= reg->guest_phys_addr &&
|
|
reg->guest_phys_addr + reg->memory_size > gpa) {
|
|
*uaddr = reg->userspace_addr + gpa - reg->guest_phys_addr;
|
|
*len = reg->guest_phys_addr + reg->memory_size - gpa;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -EFAULT;
|
|
}
|
|
|
|
int vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write)
|
|
{
|
|
IOMMUTLBEntry iotlb;
|
|
uint64_t uaddr, len;
|
|
int ret = -EFAULT;
|
|
|
|
RCU_READ_LOCK_GUARD();
|
|
|
|
trace_vhost_iotlb_miss(dev, 1);
|
|
|
|
iotlb = address_space_get_iotlb_entry(dev->vdev->dma_as,
|
|
iova, write,
|
|
MEMTXATTRS_UNSPECIFIED);
|
|
if (iotlb.target_as != NULL) {
|
|
ret = vhost_memory_region_lookup(dev, iotlb.translated_addr,
|
|
&uaddr, &len);
|
|
if (ret) {
|
|
trace_vhost_iotlb_miss(dev, 3);
|
|
error_report("Fail to lookup the translated address "
|
|
"%"PRIx64, iotlb.translated_addr);
|
|
goto out;
|
|
}
|
|
|
|
len = MIN(iotlb.addr_mask + 1, len);
|
|
iova = iova & ~iotlb.addr_mask;
|
|
|
|
ret = vhost_backend_update_device_iotlb(dev, iova, uaddr,
|
|
len, iotlb.perm);
|
|
if (ret) {
|
|
trace_vhost_iotlb_miss(dev, 4);
|
|
error_report("Fail to update device iotlb");
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
trace_vhost_iotlb_miss(dev, 2);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
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);
|
|
|
|
a = virtio_queue_get_desc_addr(vdev, idx);
|
|
if (a == 0) {
|
|
/* Queue might not be ready for start */
|
|
return 0;
|
|
}
|
|
|
|
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(r, "vhost_set_vring_num failed");
|
|
return r;
|
|
}
|
|
|
|
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(r, "vhost_set_vring_base failed");
|
|
return r;
|
|
}
|
|
|
|
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 r;
|
|
}
|
|
}
|
|
|
|
vq->desc_size = s = l = virtio_queue_get_desc_size(vdev, idx);
|
|
vq->desc_phys = a;
|
|
vq->desc = vhost_memory_map(dev, a, &l, false);
|
|
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 = vhost_memory_map(dev, a, &l, false);
|
|
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 = vhost_memory_map(dev, a, &l, true);
|
|
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) {
|
|
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(r, "vhost_set_vring_kick failed");
|
|
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:
|
|
vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx),
|
|
0, 0);
|
|
fail_alloc_used:
|
|
vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx),
|
|
0, 0);
|
|
fail_alloc_avail:
|
|
vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx),
|
|
0, 0);
|
|
fail_alloc_desc:
|
|
return r;
|
|
}
|
|
|
|
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;
|
|
|
|
if (virtio_queue_get_desc_addr(vdev, idx) == 0) {
|
|
/* Don't stop the virtqueue which might have not been started */
|
|
return;
|
|
}
|
|
|
|
r = dev->vhost_ops->vhost_get_vring_base(dev, &state);
|
|
if (r < 0) {
|
|
VHOST_OPS_DEBUG(r, "vhost VQ %u ring restore failed: %d", idx, r);
|
|
/* Connection to the backend is broken, so let's sync internal
|
|
* last avail idx to the device used idx.
|
|
*/
|
|
virtio_queue_restore_last_avail_idx(vdev, idx);
|
|
} 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);
|
|
}
|
|
|
|
vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx),
|
|
1, virtio_queue_get_used_size(vdev, idx));
|
|
vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx),
|
|
0, virtio_queue_get_avail_size(vdev, idx));
|
|
vhost_memory_unmap(dev, 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(r, "vhost_set_vring_busyloop_timeout failed");
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void vhost_virtqueue_error_notifier(EventNotifier *n)
|
|
{
|
|
struct vhost_virtqueue *vq = container_of(n, struct vhost_virtqueue,
|
|
error_notifier);
|
|
struct vhost_dev *dev = vq->dev;
|
|
int index = vq - dev->vqs;
|
|
|
|
if (event_notifier_test_and_clear(n) && dev->vdev) {
|
|
VHOST_OPS_DEBUG(-EINVAL, "vhost vring error in virtqueue %d",
|
|
dev->vq_index + index);
|
|
}
|
|
}
|
|
|
|
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_wfd(&vq->masked_notifier);
|
|
r = dev->vhost_ops->vhost_set_vring_call(dev, &file);
|
|
if (r) {
|
|
VHOST_OPS_DEBUG(r, "vhost_set_vring_call failed");
|
|
goto fail_call;
|
|
}
|
|
|
|
vq->dev = dev;
|
|
|
|
if (dev->vhost_ops->vhost_set_vring_err) {
|
|
r = event_notifier_init(&vq->error_notifier, 0);
|
|
if (r < 0) {
|
|
goto fail_call;
|
|
}
|
|
|
|
file.fd = event_notifier_get_fd(&vq->error_notifier);
|
|
r = dev->vhost_ops->vhost_set_vring_err(dev, &file);
|
|
if (r) {
|
|
VHOST_OPS_DEBUG(r, "vhost_set_vring_err failed");
|
|
goto fail_err;
|
|
}
|
|
|
|
event_notifier_set_handler(&vq->error_notifier,
|
|
vhost_virtqueue_error_notifier);
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail_err:
|
|
event_notifier_cleanup(&vq->error_notifier);
|
|
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);
|
|
if (vq->dev->vhost_ops->vhost_set_vring_err) {
|
|
event_notifier_set_handler(&vq->error_notifier, NULL);
|
|
event_notifier_cleanup(&vq->error_notifier);
|
|
}
|
|
}
|
|
|
|
int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
|
|
VhostBackendType backend_type, uint32_t busyloop_timeout,
|
|
Error **errp)
|
|
{
|
|
uint64_t features;
|
|
int i, r, n_initialized_vqs = 0;
|
|
|
|
hdev->vdev = NULL;
|
|
hdev->migration_blocker = NULL;
|
|
|
|
r = vhost_set_backend_type(hdev, backend_type);
|
|
assert(r >= 0);
|
|
|
|
r = hdev->vhost_ops->vhost_backend_init(hdev, opaque, errp);
|
|
if (r < 0) {
|
|
goto fail;
|
|
}
|
|
|
|
r = hdev->vhost_ops->vhost_set_owner(hdev);
|
|
if (r < 0) {
|
|
error_setg_errno(errp, -r, "vhost_set_owner failed");
|
|
goto fail;
|
|
}
|
|
|
|
r = hdev->vhost_ops->vhost_get_features(hdev, &features);
|
|
if (r < 0) {
|
|
error_setg_errno(errp, -r, "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) {
|
|
error_setg_errno(errp, -r, "Failed to initialize virtqueue %d", i);
|
|
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) {
|
|
error_setg_errno(errp, -r, "Failed to set busyloop timeout");
|
|
goto fail_busyloop;
|
|
}
|
|
}
|
|
}
|
|
|
|
hdev->features = features;
|
|
|
|
hdev->memory_listener = (MemoryListener) {
|
|
.name = "vhost",
|
|
.begin = vhost_begin,
|
|
.commit = vhost_commit,
|
|
.region_add = vhost_region_addnop,
|
|
.region_nop = vhost_region_addnop,
|
|
.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->iommu_listener = (MemoryListener) {
|
|
.name = "vhost-iommu",
|
|
.region_add = vhost_iommu_region_add,
|
|
.region_del = vhost_iommu_region_del,
|
|
};
|
|
|
|
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_alloc_check()) {
|
|
error_setg(&hdev->migration_blocker,
|
|
"Migration disabled: failed to allocate shared memory");
|
|
}
|
|
}
|
|
|
|
if (hdev->migration_blocker != NULL) {
|
|
r = migrate_add_blocker(hdev->migration_blocker, errp);
|
|
if (r < 0) {
|
|
error_free(hdev->migration_blocker);
|
|
goto fail_busyloop;
|
|
}
|
|
}
|
|
|
|
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);
|
|
QLIST_INSERT_HEAD(&vhost_devices, hdev, entry);
|
|
|
|
if (used_memslots > hdev->vhost_ops->vhost_backend_memslots_limit(hdev)) {
|
|
error_setg(errp, "vhost backend memory slots limit is less"
|
|
" than current number of present memory slots");
|
|
r = -EINVAL;
|
|
goto fail_busyloop;
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail_busyloop:
|
|
if (busyloop_timeout) {
|
|
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;
|
|
|
|
trace_vhost_dev_cleanup(hdev);
|
|
|
|
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_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i);
|
|
}
|
|
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_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i);
|
|
}
|
|
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_wfd(&hdev->vqs[index].masked_notifier);
|
|
} else {
|
|
file.fd = event_notifier_get_wfd(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(r, "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++;
|
|
}
|
|
}
|
|
|
|
int vhost_dev_get_config(struct vhost_dev *hdev, uint8_t *config,
|
|
uint32_t config_len, Error **errp)
|
|
{
|
|
assert(hdev->vhost_ops);
|
|
|
|
if (hdev->vhost_ops->vhost_get_config) {
|
|
return hdev->vhost_ops->vhost_get_config(hdev, config, config_len,
|
|
errp);
|
|
}
|
|
|
|
error_setg(errp, "vhost_get_config not implemented");
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int vhost_dev_set_config(struct vhost_dev *hdev, const uint8_t *data,
|
|
uint32_t offset, uint32_t size, uint32_t flags)
|
|
{
|
|
assert(hdev->vhost_ops);
|
|
|
|
if (hdev->vhost_ops->vhost_set_config) {
|
|
return hdev->vhost_ops->vhost_set_config(hdev, data, offset,
|
|
size, flags);
|
|
}
|
|
|
|
return -ENOSYS;
|
|
}
|
|
|
|
void vhost_dev_set_config_notifier(struct vhost_dev *hdev,
|
|
const VhostDevConfigOps *ops)
|
|
{
|
|
hdev->config_ops = ops;
|
|
}
|
|
|
|
void vhost_dev_free_inflight(struct vhost_inflight *inflight)
|
|
{
|
|
if (inflight && inflight->addr) {
|
|
qemu_memfd_free(inflight->addr, inflight->size, inflight->fd);
|
|
inflight->addr = NULL;
|
|
inflight->fd = -1;
|
|
}
|
|
}
|
|
|
|
static int vhost_dev_resize_inflight(struct vhost_inflight *inflight,
|
|
uint64_t new_size)
|
|
{
|
|
Error *err = NULL;
|
|
int fd = -1;
|
|
void *addr = qemu_memfd_alloc("vhost-inflight", new_size,
|
|
F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL,
|
|
&fd, &err);
|
|
|
|
if (err) {
|
|
error_report_err(err);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
vhost_dev_free_inflight(inflight);
|
|
inflight->offset = 0;
|
|
inflight->addr = addr;
|
|
inflight->fd = fd;
|
|
inflight->size = new_size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void vhost_dev_save_inflight(struct vhost_inflight *inflight, QEMUFile *f)
|
|
{
|
|
if (inflight->addr) {
|
|
qemu_put_be64(f, inflight->size);
|
|
qemu_put_be16(f, inflight->queue_size);
|
|
qemu_put_buffer(f, inflight->addr, inflight->size);
|
|
} else {
|
|
qemu_put_be64(f, 0);
|
|
}
|
|
}
|
|
|
|
int vhost_dev_load_inflight(struct vhost_inflight *inflight, QEMUFile *f)
|
|
{
|
|
uint64_t size;
|
|
|
|
size = qemu_get_be64(f);
|
|
if (!size) {
|
|
return 0;
|
|
}
|
|
|
|
if (inflight->size != size) {
|
|
int ret = vhost_dev_resize_inflight(inflight, size);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
}
|
|
inflight->queue_size = qemu_get_be16(f);
|
|
|
|
qemu_get_buffer(f, inflight->addr, size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int vhost_dev_prepare_inflight(struct vhost_dev *hdev, VirtIODevice *vdev)
|
|
{
|
|
int r;
|
|
|
|
if (hdev->vhost_ops->vhost_get_inflight_fd == NULL ||
|
|
hdev->vhost_ops->vhost_set_inflight_fd == NULL) {
|
|
return 0;
|
|
}
|
|
|
|
hdev->vdev = vdev;
|
|
|
|
r = vhost_dev_set_features(hdev, hdev->log_enabled);
|
|
if (r < 0) {
|
|
VHOST_OPS_DEBUG(r, "vhost_dev_prepare_inflight failed");
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int vhost_dev_set_inflight(struct vhost_dev *dev,
|
|
struct vhost_inflight *inflight)
|
|
{
|
|
int r;
|
|
|
|
if (dev->vhost_ops->vhost_set_inflight_fd && inflight->addr) {
|
|
r = dev->vhost_ops->vhost_set_inflight_fd(dev, inflight);
|
|
if (r) {
|
|
VHOST_OPS_DEBUG(r, "vhost_set_inflight_fd failed");
|
|
return r;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int vhost_dev_get_inflight(struct vhost_dev *dev, uint16_t queue_size,
|
|
struct vhost_inflight *inflight)
|
|
{
|
|
int r;
|
|
|
|
if (dev->vhost_ops->vhost_get_inflight_fd) {
|
|
r = dev->vhost_ops->vhost_get_inflight_fd(dev, queue_size, inflight);
|
|
if (r) {
|
|
VHOST_OPS_DEBUG(r, "vhost_get_inflight_fd failed");
|
|
return r;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_dev_set_vring_enable(struct vhost_dev *hdev, int enable)
|
|
{
|
|
if (!hdev->vhost_ops->vhost_set_vring_enable) {
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* For vhost-user devices, if VHOST_USER_F_PROTOCOL_FEATURES has not
|
|
* been negotiated, the rings start directly in the enabled state, and
|
|
* .vhost_set_vring_enable callback will fail since
|
|
* VHOST_USER_SET_VRING_ENABLE is not supported.
|
|
*/
|
|
if (hdev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER &&
|
|
!virtio_has_feature(hdev->backend_features,
|
|
VHOST_USER_F_PROTOCOL_FEATURES)) {
|
|
return 0;
|
|
}
|
|
|
|
return hdev->vhost_ops->vhost_set_vring_enable(hdev, enable);
|
|
}
|
|
|
|
/* Host notifiers must be enabled at this point. */
|
|
int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev, bool vrings)
|
|
{
|
|
int i, r;
|
|
|
|
/* should only be called after backend is connected */
|
|
assert(hdev->vhost_ops);
|
|
|
|
trace_vhost_dev_start(hdev, vdev->name, vrings);
|
|
|
|
vdev->vhost_started = true;
|
|
hdev->started = true;
|
|
hdev->vdev = vdev;
|
|
|
|
r = vhost_dev_set_features(hdev, hdev->log_enabled);
|
|
if (r < 0) {
|
|
goto fail_features;
|
|
}
|
|
|
|
if (vhost_dev_has_iommu(hdev)) {
|
|
memory_listener_register(&hdev->iommu_listener, vdev->dma_as);
|
|
}
|
|
|
|
r = hdev->vhost_ops->vhost_set_mem_table(hdev, hdev->mem);
|
|
if (r < 0) {
|
|
VHOST_OPS_DEBUG(r, "vhost_set_mem_table failed");
|
|
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(r, "vhost_set_log_base failed");
|
|
goto fail_log;
|
|
}
|
|
}
|
|
if (vrings) {
|
|
r = vhost_dev_set_vring_enable(hdev, true);
|
|
if (r) {
|
|
goto fail_log;
|
|
}
|
|
}
|
|
if (hdev->vhost_ops->vhost_dev_start) {
|
|
r = hdev->vhost_ops->vhost_dev_start(hdev, true);
|
|
if (r) {
|
|
goto fail_start;
|
|
}
|
|
}
|
|
if (vhost_dev_has_iommu(hdev) &&
|
|
hdev->vhost_ops->vhost_set_iotlb_callback) {
|
|
hdev->vhost_ops->vhost_set_iotlb_callback(hdev, true);
|
|
|
|
/* Update used ring information for IOTLB to work correctly,
|
|
* vhost-kernel code requires for this.*/
|
|
for (i = 0; i < hdev->nvqs; ++i) {
|
|
struct vhost_virtqueue *vq = hdev->vqs + i;
|
|
vhost_device_iotlb_miss(hdev, vq->used_phys, true);
|
|
}
|
|
}
|
|
return 0;
|
|
fail_start:
|
|
if (vrings) {
|
|
vhost_dev_set_vring_enable(hdev, false);
|
|
}
|
|
fail_log:
|
|
vhost_log_put(hdev, false);
|
|
fail_vq:
|
|
while (--i >= 0) {
|
|
vhost_virtqueue_stop(hdev,
|
|
vdev,
|
|
hdev->vqs + i,
|
|
hdev->vq_index + i);
|
|
}
|
|
|
|
fail_mem:
|
|
fail_features:
|
|
vdev->vhost_started = false;
|
|
hdev->started = false;
|
|
return r;
|
|
}
|
|
|
|
/* Host notifiers must be enabled at this point. */
|
|
void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev, bool vrings)
|
|
{
|
|
int i;
|
|
|
|
/* should only be called after backend is connected */
|
|
assert(hdev->vhost_ops);
|
|
|
|
trace_vhost_dev_stop(hdev, vdev->name, vrings);
|
|
|
|
if (hdev->vhost_ops->vhost_dev_start) {
|
|
hdev->vhost_ops->vhost_dev_start(hdev, false);
|
|
}
|
|
if (vrings) {
|
|
vhost_dev_set_vring_enable(hdev, false);
|
|
}
|
|
for (i = 0; i < hdev->nvqs; ++i) {
|
|
vhost_virtqueue_stop(hdev,
|
|
vdev,
|
|
hdev->vqs + i,
|
|
hdev->vq_index + i);
|
|
}
|
|
|
|
if (vhost_dev_has_iommu(hdev)) {
|
|
if (hdev->vhost_ops->vhost_set_iotlb_callback) {
|
|
hdev->vhost_ops->vhost_set_iotlb_callback(hdev, false);
|
|
}
|
|
memory_listener_unregister(&hdev->iommu_listener);
|
|
}
|
|
vhost_log_put(hdev, true);
|
|
hdev->started = false;
|
|
vdev->vhost_started = false;
|
|
hdev->vdev = NULL;
|
|
}
|
|
|
|
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 -ENOSYS;
|
|
}
|