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)
+{
+ 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);
+ 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,
+};
+
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
