On Sun, Oct 23, 2022 at 10:46 PM Cindy Lu <l...@redhat.com> wrote:
>
> On Thu, 20 Oct 2022 at 10:15, Jason Wang <jasow...@redhat.com> wrote:
> >
> > 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?
> >
> for this function, I have tried but seems the vfio does not complied
> in some arch by default
> such as m68k-softmmu, if we want to use this function, maybe we need
> to enable the VFIO in
> that arch, not sure if this is worth？
> Thanks
> cindy
The function is nothing vfio specific, so let's move it somewhere e.g memory.c?
Thanks
>
> > > +{
> > > + 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.
> >
> sure will change this
> > > + 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
> >
> sure Thanks Jason , will provide a new version soon
> Thanks
> Cindy
> > > +};
> > > +
> > > 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
> > >
> >
>
