On Wed, Oct 19, 2022 at 2:39 PM Cindy Lu <l...@redhat.com> wrote: > > Add support for vIOMMU. Register a memory listener to dma_as in > dev_start > - during region_add register a specific IOMMU notifier, and store all > notifiers in a list. > - during region_del, compare and delete the IOMMU notifier from the list > > Verified in vp_vdpa and vdpa_sim_net driver > > Signed-off-by: Cindy Lu <l...@redhat.com> > --- > hw/virtio/vhost-vdpa.c | 218 ++++++++++++++++++++++++++++++++- > include/hw/virtio/vhost-vdpa.h | 11 ++ > 2 files changed, 226 insertions(+), 3 deletions(-) > > diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c > index 3ff9ce3501..8f36423c28 100644 > --- a/hw/virtio/vhost-vdpa.c > +++ b/hw/virtio/vhost-vdpa.c > @@ -26,6 +26,7 @@ > #include "cpu.h" > #include "trace.h" > #include "qapi/error.h" > +#include "hw/virtio/virtio-access.h" > > /* > * Return one past the end of the end of section. Be careful with uint64_t > @@ -146,9 +147,8 @@ static void vhost_vdpa_iotlb_batch_begin_once(struct > vhost_vdpa *v) > v->iotlb_batch_begin_sent = true; > } > > -static void vhost_vdpa_listener_commit(MemoryListener *listener) > +static void vhost_vdpa_iotlb_batch_end(struct vhost_vdpa *v) > { > - struct vhost_vdpa *v = container_of(listener, struct vhost_vdpa, > listener); > struct vhost_dev *dev = v->dev; > struct vhost_msg_v2 msg = {}; > int fd = v->device_fd; > @@ -172,6 +172,18 @@ static void vhost_vdpa_listener_commit(MemoryListener > *listener) > > v->iotlb_batch_begin_sent = false; > } > +static void vhost_vdpa_listener_commit(MemoryListener *listener) > +{ > + struct vhost_vdpa *v = container_of(listener, struct vhost_vdpa, > listener); > + return vhost_vdpa_iotlb_batch_end(v); > +} > + > +static void vhost_vdpa_listener_iommu_commit(MemoryListener *listener) > +{ > + struct vhost_vdpa *v = > + container_of(listener, struct vhost_vdpa, iommu_listener); > + return vhost_vdpa_iotlb_batch_end(v); > +} > > static void vhost_vdpa_listener_region_add(MemoryListener *listener, > MemoryRegionSection *section) > @@ -186,6 +198,9 @@ static void vhost_vdpa_listener_region_add(MemoryListener > *listener, > v->iova_range.last)) { > return; > } > + if (memory_region_is_iommu(section->mr)) { > + return; > + } > > if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) > != > (section->offset_within_region & ~TARGET_PAGE_MASK))) { > @@ -260,6 +275,9 @@ static void vhost_vdpa_listener_region_del(MemoryListener > *listener, > v->iova_range.last)) { > return; > } > + if (memory_region_is_iommu(section->mr)) { > + return; > + } > > if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) > != > (section->offset_within_region & ~TARGET_PAGE_MASK))) { > @@ -312,6 +330,180 @@ static const MemoryListener vhost_vdpa_memory_listener > = { > .region_del = vhost_vdpa_listener_region_del, > }; > > +/* Called with rcu_read_lock held. */ > +static bool vhost_vdpa_get_xlat_addr(IOMMUTLBEntry *iotlb, void **vaddr, > + ram_addr_t *ram_addr, bool *read_only)
So this looks exact the same as what VFIO did, try to unify them? > +{ > + MemoryRegion *mr; > + hwaddr xlat; > + hwaddr len = iotlb->addr_mask + 1; > + bool writable = iotlb->perm & IOMMU_WO; > + > + /* > + * The IOMMU TLB entry we have just covers translation through > + * this IOMMU to its immediate target. We need to translate > + * it the rest of the way through to memory. > + */ > + mr = address_space_translate(&address_space_memory, > iotlb->translated_addr, > + &xlat, &len, writable, > MEMTXATTRS_UNSPECIFIED); > + if (!memory_region_is_ram(mr)) { > + error_report("iommu map to non memory area %" HWADDR_PRIx "", xlat); > + return false; > + } else if (memory_region_has_ram_discard_manager(mr)) { > + RamDiscardManager *rdm = memory_region_get_ram_discard_manager(mr); > + MemoryRegionSection tmp = { > + .mr = mr, > + .offset_within_region = xlat, > + .size = int128_make64(len), > + }; > + > + if (!ram_discard_manager_is_populated(rdm, &tmp)) { > + error_report("iommu map to discarded memory (e.g., unplugged via" > + " virtio-mem): %" HWADDR_PRIx "", > + iotlb->translated_addr); > + return false; > + } > + } > + /* > + * Translation truncates length to the IOMMU page size, > + * check that it did not truncate too much. > + */ > + if (len & iotlb->addr_mask) { > + error_report("iommu has granularity incompatible with target AS"); > + return false; > + } > + > + if (vaddr) { > + *vaddr = memory_region_get_ram_ptr(mr) + xlat; > + } > + > + if (ram_addr) { > + *ram_addr = memory_region_get_ram_addr(mr) + xlat; > + } > + > + if (read_only) { > + *read_only = !writable || mr->readonly; > + } > + > + return true; > +} > + > +static void vhost_vdpa_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry > *iotlb) > +{ > + struct vdpa_iommu *iommu = container_of(n, struct vdpa_iommu, n); > + > + hwaddr iova = iotlb->iova + iommu->iommu_offset; > + struct vhost_vdpa *v = iommu->dev; > + void *vaddr; > + int ret; > + > + if (iotlb->target_as != &address_space_memory) { > + error_report("Wrong target AS \"%s\", only system memory is allowed", > + iotlb->target_as->name ? iotlb->target_as->name : > "none"); > + return; > + } > + RCU_READ_LOCK_GUARD(); > + vhost_vdpa_iotlb_batch_begin_once(v); > + > + if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) { > + bool read_only; > + > + if (!vhost_vdpa_get_xlat_addr(iotlb, &vaddr, NULL, &read_only)) { > + return; > + } > + ret = > + vhost_vdpa_dma_map(v, iova, iotlb->addr_mask + 1, vaddr, > read_only); > + if (ret) { > + error_report("vhost_vdpa_dma_map(%p, 0x%" HWADDR_PRIx ", " > + "0x%" HWADDR_PRIx ", %p) = %d (%m)", > + v, iova, iotlb->addr_mask + 1, vaddr, ret); > + } > + } else { > + ret = vhost_vdpa_dma_unmap(v, iova, iotlb->addr_mask + 1); > + if (ret) { > + error_report("vhost_vdpa_dma_unmap(%p, 0x%" HWADDR_PRIx ", " > + "0x%" HWADDR_PRIx ") = %d (%m)", > + v, iova, iotlb->addr_mask + 1, ret); > + } > + } > +} > + > +static void vhost_vdpa_iommu_region_add(MemoryListener *listener, > + MemoryRegionSection *section) > +{ > + struct vhost_vdpa *v = > + container_of(listener, struct vhost_vdpa, iommu_listener); > + > + struct vdpa_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); I'd suggest to tweak the line breaking here and below, e.g you can keep int128_add and other stuffs as long as it does not exceeds 70 or 80 characters at the line where "end =" sits. > + end = int128_sub(end, int128_one()); > + iommu_idx = > + memory_region_iommu_attrs_to_index(iommu_mr, MEMTXATTRS_UNSPECIFIED); > + iommu->iommu_mr = iommu_mr; > + > + iommu_notifier_init( > + &iommu->n, vhost_vdpa_iommu_map_notify, IOMMU_NOTIFIER_IOTLB_EVENTS, > + section->offset_within_region, int128_get64(end), iommu_idx); > + iommu->iommu_offset = > + section->offset_within_address_space - section->offset_within_region; > + iommu->dev = v; > + > + ret = memory_region_register_iommu_notifier(section->mr, &iommu->n, > NULL); > + if (ret) { > + g_free(iommu); > + return; > + } > + > + QLIST_INSERT_HEAD(&v->iommu_list, iommu, iommu_next); > + memory_region_iommu_replay(iommu->iommu_mr, &iommu->n); > + > + return; > +} > + > +static void vhost_vdpa_iommu_region_del(MemoryListener *listener, > + MemoryRegionSection *section) > +{ > + struct vhost_vdpa *v = > + container_of(listener, struct vhost_vdpa, iommu_listener); > + > + struct vdpa_iommu *iommu; > + > + if (!memory_region_is_iommu(section->mr)) { > + return; > + } > + > + QLIST_FOREACH(iommu, &v->iommu_list, iommu_next) > + { > + if (MEMORY_REGION(iommu->iommu_mr) == section->mr && > + iommu->n.start == section->offset_within_region) { > + memory_region_unregister_iommu_notifier(section->mr, &iommu->n); > + QLIST_REMOVE(iommu, iommu_next); > + g_free(iommu); > + break; > + } > + } > +} > + > +static const MemoryListener vhost_vdpa_iommu_listener = { > + .name = "vhost-vdpa-iommu", > + .region_add = vhost_vdpa_iommu_region_add, > + .region_del = vhost_vdpa_iommu_region_del, > + .commit = vhost_vdpa_listener_iommu_commit, Unless there's a special requirement. I'd suggest to reuse the existing listener (since you've already had if (iommu_region()) check there). Thanks > +}; > + > static int vhost_vdpa_call(struct vhost_dev *dev, unsigned long int request, > void *arg) > { > @@ -433,6 +625,18 @@ static int vhost_vdpa_init_svq(struct vhost_dev *hdev, > struct vhost_vdpa *v, > return 0; > } > > +static bool vdpa_dev_has_iommu(struct vhost_dev *dev) > +{ > + VirtIODevice *vdev = dev->vdev; > + > + if (vdev) { > + return virtio_bus_device_iommu_enabled(vdev) && > + virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM); > + } else { > + return false; > + } > +} > + > static int vhost_vdpa_init(struct vhost_dev *dev, void *opaque, Error **errp) > { > struct vhost_vdpa *v; > @@ -454,6 +658,7 @@ static int vhost_vdpa_init(struct vhost_dev *dev, void > *opaque, Error **errp) > v->dev = dev; > dev->opaque = opaque ; > v->listener = vhost_vdpa_memory_listener; > + v->iommu_listener = vhost_vdpa_iommu_listener; > v->msg_type = VHOST_IOTLB_MSG_V2; > ret = vhost_vdpa_init_svq(dev, v, errp); > if (ret) { > @@ -587,7 +792,6 @@ static int vhost_vdpa_cleanup(struct vhost_dev *dev) > v = dev->opaque; > trace_vhost_vdpa_cleanup(dev, v); > vhost_vdpa_host_notifiers_uninit(dev, dev->nvqs); > - memory_listener_unregister(&v->listener); > vhost_vdpa_svq_cleanup(dev); > > dev->opaque = NULL; > @@ -1128,11 +1332,19 @@ static int vhost_vdpa_dev_start(struct vhost_dev > *dev, bool started) > > if (started) { > memory_listener_register(&v->listener, &address_space_memory); > + if (vdpa_dev_has_iommu(dev)) { > + memory_listener_register(&v->iommu_listener, dev->vdev->dma_as); > + } > + > return vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK); > } else { > vhost_vdpa_reset_device(dev); > vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE | > VIRTIO_CONFIG_S_DRIVER); > + > + if (vdpa_dev_has_iommu(dev)) { > + memory_listener_unregister(&v->iommu_listener); > + } > memory_listener_unregister(&v->listener); > > return 0; > diff --git a/include/hw/virtio/vhost-vdpa.h b/include/hw/virtio/vhost-vdpa.h > index d10a89303e..22cbce7934 100644 > --- a/include/hw/virtio/vhost-vdpa.h > +++ b/include/hw/virtio/vhost-vdpa.h > @@ -30,6 +30,7 @@ typedef struct vhost_vdpa { > uint32_t msg_type; > bool iotlb_batch_begin_sent; > MemoryListener listener; > + MemoryListener iommu_listener; > struct vhost_vdpa_iova_range iova_range; > uint64_t acked_features; > bool shadow_vqs_enabled; > @@ -41,8 +42,18 @@ typedef struct vhost_vdpa { > void *shadow_vq_ops_opaque; > struct vhost_dev *dev; > VhostVDPAHostNotifier notifier[VIRTIO_QUEUE_MAX]; > + QLIST_HEAD(, vdpa_iommu) iommu_list; > + IOMMUNotifier n; > } VhostVDPA; > > +struct vdpa_iommu { > + struct vhost_vdpa *dev; > + IOMMUMemoryRegion *iommu_mr; > + hwaddr iommu_offset; > + IOMMUNotifier n; > + QLIST_ENTRY(vdpa_iommu) iommu_next; > +}; > + > int vhost_vdpa_dma_map(struct vhost_vdpa *v, hwaddr iova, hwaddr size, > void *vaddr, bool readonly); > int vhost_vdpa_dma_unmap(struct vhost_vdpa *v, hwaddr iova, hwaddr size); > -- > 2.34.3 >