On Thu, 20 Oct 2022 at 10:15, Jason Wang <[email protected]> wrote:
>
> On Wed, Oct 19, 2022 at 2:39 PM Cindy Lu <[email protected]> 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 <[email protected]>
> > ---
> > 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
> > +{
> > + 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
> >
>
