virtio: convert to use DMA api

Currently, all virtio devices bypass IOMMU completely. This is because
address_space_memory is assumed and used during DMA emulation. This
patch converts the virtio core API to use DMA API. This idea is

- introducing a new transport specific helper to query the dma address
  space. (only pci version is implemented).
- query and use this address space during virtio device guest memory
  accessing when iommu platform (VIRTIO_F_IOMMU_PLATFORM) was enabled
  for this device.

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>
Cc: Amit Shah <amit.shah@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: qemu-block@nongnu.org
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

3 files changed, 59 insertions, 20 deletions

diff --git a/hw/virtio/virtio-bus.c b/hw/virtio/virtio-bus.c
index d6c0c72bd2..d31cc00e83 100644
--- a/hw/virtio/virtio-bus.c
+++ b/hw/virtio/virtio-bus.c
@@ -28,6 +28,7 @@
 #include "hw/qdev.h"
 #include "hw/virtio/virtio-bus.h"
 #include "hw/virtio/virtio.h"
+#include "exec/address-spaces.h"
 
 /* #define DEBUG_VIRTIO_BUS */
 
@@ -61,6 +62,13 @@ void virtio_bus_device_plugged(VirtIODevice *vdev, Error **errp)
     if (klass->device_plugged != NULL) {
         klass->device_plugged(qbus->parent, errp);
     }
+
+    if (klass->get_dma_as != NULL &&
+        virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM)) {
+        vdev->dma_as = klass->get_dma_as(qbus->parent);
+    } else {
+        vdev->dma_as = &address_space_memory;
+    }
 }
 
 /* Reset the virtio_bus */
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 21c2b9dbfc..213d57e9fe 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -1144,6 +1144,14 @@ static int virtio_pci_query_nvectors(DeviceState *d)
     return proxy->nvectors;
 }
 
+static AddressSpace *virtio_pci_get_dma_as(DeviceState *d)
+{
+    VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
+    PCIDevice *dev = &proxy->pci_dev;
+
+    return pci_get_address_space(dev);
+}
+
 static int virtio_pci_add_mem_cap(VirtIOPCIProxy *proxy,
                                    struct virtio_pci_cap *cap)
 {
@@ -1601,6 +1609,11 @@ static void virtio_pci_device_plugged(DeviceState *d, Error **errp)
     }
 
     if (legacy) {
+        if (virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM)) {
+            error_setg(errp, "VIRTIO_F_IOMMU_PLATFORM was supported by"
+                       "neither legacy nor transitional device.");
+            return ;
+        }
         /* legacy and transitional */
         pci_set_word(config + PCI_SUBSYSTEM_VENDOR_ID,
                      pci_get_word(config + PCI_VENDOR_ID));
@@ -2520,6 +2533,7 @@ static void virtio_pci_bus_class_init(ObjectClass *klass, void *data)
     k->query_nvectors = virtio_pci_query_nvectors;
     k->ioeventfd_enabled = virtio_pci_ioeventfd_enabled;
     k->ioeventfd_assign = virtio_pci_ioeventfd_assign;
+    k->get_dma_as = virtio_pci_get_dma_as;
 }
 
 static const TypeInfo virtio_pci_bus_info = {
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index d40711a31d..933a3d749a 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -23,6 +23,7 @@
 #include "hw/virtio/virtio-bus.h"
 #include "migration/migration.h"
 #include "hw/virtio/virtio-access.h"
+#include "sysemu/dma.h"
 
 /*
  * The alignment to use between consumer and producer parts of vring.
@@ -121,7 +122,7 @@ void virtio_queue_update_rings(VirtIODevice *vdev, int n)
 static void vring_desc_read(VirtIODevice *vdev, VRingDesc *desc,
                             hwaddr desc_pa, int i)
 {
-    address_space_read(&address_space_memory, desc_pa + i * sizeof(VRingDesc),
+    address_space_read(vdev->dma_as, desc_pa + i * sizeof(VRingDesc),
                        MEMTXATTRS_UNSPECIFIED, (void *)desc, sizeof(VRingDesc));
     virtio_tswap64s(vdev, &desc->addr);
     virtio_tswap32s(vdev, &desc->len);
@@ -163,7 +164,7 @@ static inline void vring_used_write(VirtQueue *vq, VRingUsedElem *uelem,
     virtio_tswap32s(vq->vdev, &uelem->id);
     virtio_tswap32s(vq->vdev, &uelem->len);
     pa = vq->vring.used + offsetof(VRingUsed, ring[i]);
-    address_space_write(&address_space_memory, pa, MEMTXATTRS_UNSPECIFIED,
+    address_space_write(vq->vdev->dma_as, pa, MEMTXATTRS_UNSPECIFIED,
                        (void *)uelem, sizeof(VRingUsedElem));
 }
 
@@ -249,6 +250,7 @@ int virtio_queue_empty(VirtQueue *vq)
 static void virtqueue_unmap_sg(VirtQueue *vq, const VirtQueueElement *elem,
                                unsigned int len)
 {
+    AddressSpace *dma_as = vq->vdev->dma_as;
     unsigned int offset;
     int i;
 
@@ -256,17 +258,18 @@ static void virtqueue_unmap_sg(VirtQueue *vq, const VirtQueueElement *elem,
     for (i = 0; i < elem->in_num; i++) {
         size_t size = MIN(len - offset, elem->in_sg[i].iov_len);
 
-        cpu_physical_memory_unmap(elem->in_sg[i].iov_base,
-                                  elem->in_sg[i].iov_len,
-                                  1, size);
+        dma_memory_unmap(dma_as, elem->in_sg[i].iov_base,
+                         elem->in_sg[i].iov_len,
+                         DMA_DIRECTION_FROM_DEVICE, size);
 
         offset += size;
     }
 
     for (i = 0; i < elem->out_num; i++)
-        cpu_physical_memory_unmap(elem->out_sg[i].iov_base,
-                                  elem->out_sg[i].iov_len,
-                                  0, elem->out_sg[i].iov_len);
+        dma_memory_unmap(dma_as, elem->out_sg[i].iov_base,
+                         elem->out_sg[i].iov_len,
+                         DMA_DIRECTION_TO_DEVICE,
+                         elem->out_sg[i].iov_len);
 }
 
 /* virtqueue_detach_element:
@@ -560,7 +563,10 @@ static bool virtqueue_map_desc(VirtIODevice *vdev, unsigned int *p_num_sg,
             goto out;
         }
 
-        iov[num_sg].iov_base = cpu_physical_memory_map(pa, &len, is_write);
+        iov[num_sg].iov_base = dma_memory_map(vdev->dma_as, pa, &len,
+                                              is_write ?
+                                              DMA_DIRECTION_FROM_DEVICE :
+                                              DMA_DIRECTION_TO_DEVICE);
         if (!iov[num_sg].iov_base) {
             virtio_error(vdev, "virtio: bogus descriptor or out of resources");
             goto out;
@@ -597,9 +603,9 @@ static void virtqueue_undo_map_desc(unsigned int out_num, unsigned int in_num,
     }
 }
 
-static void virtqueue_map_iovec(struct iovec *sg, hwaddr *addr,
-                                unsigned int *num_sg, unsigned int max_size,
-                                int is_write)
+static void virtqueue_map_iovec(VirtIODevice *vdev, struct iovec *sg,
+                                hwaddr *addr, unsigned int *num_sg,
+                                unsigned int max_size, int is_write)
 {
     unsigned int i;
     hwaddr len;
@@ -618,7 +624,10 @@ static void virtqueue_map_iovec(struct iovec *sg, hwaddr *addr,
 
     for (i = 0; i < *num_sg; i++) {
         len = sg[i].iov_len;
-        sg[i].iov_base = cpu_physical_memory_map(addr[i], &len, is_write);
+        sg[i].iov_base = dma_memory_map(vdev->dma_as,
+                                        addr[i], &len, is_write ?
+                                        DMA_DIRECTION_FROM_DEVICE :
+                                        DMA_DIRECTION_TO_DEVICE);
         if (!sg[i].iov_base) {
             error_report("virtio: error trying to map MMIO memory");
             exit(1);
@@ -630,12 +639,15 @@ static void virtqueue_map_iovec(struct iovec *sg, hwaddr *addr,
     }
 }
 
-void virtqueue_map(VirtQueueElement *elem)
+void virtqueue_map(VirtIODevice *vdev, VirtQueueElement *elem)
 {
-    virtqueue_map_iovec(elem->in_sg, elem->in_addr, &elem->in_num,
-                        VIRTQUEUE_MAX_SIZE, 1);
-    virtqueue_map_iovec(elem->out_sg, elem->out_addr, &elem->out_num,
-                        VIRTQUEUE_MAX_SIZE, 0);
+    virtqueue_map_iovec(vdev, elem->in_sg, elem->in_addr, &elem->in_num,
+                        MIN(ARRAY_SIZE(elem->in_sg), ARRAY_SIZE(elem->in_addr)),
+                        1);
+    virtqueue_map_iovec(vdev, elem->out_sg, elem->out_addr, &elem->out_num,
+                        MIN(ARRAY_SIZE(elem->out_sg),
+                        ARRAY_SIZE(elem->out_addr)),
+                        0);
 }
 
 static void *virtqueue_alloc_element(size_t sz, unsigned out_num, unsigned in_num)
@@ -788,7 +800,7 @@ typedef struct VirtQueueElementOld {
     struct iovec out_sg[VIRTQUEUE_MAX_SIZE];
 } VirtQueueElementOld;
 
-void *qemu_get_virtqueue_element(QEMUFile *f, size_t sz)
+void *qemu_get_virtqueue_element(VirtIODevice *vdev, QEMUFile *f, size_t sz)
 {
     VirtQueueElement *elem;
     VirtQueueElementOld data;
@@ -819,7 +831,7 @@ void *qemu_get_virtqueue_element(QEMUFile *f, size_t sz)
         elem->out_sg[i].iov_len = data.out_sg[i].iov_len;
     }
 
-    virtqueue_map(elem);
+    virtqueue_map(vdev, elem);
     return elem;
 }
 
@@ -878,6 +890,11 @@ static int virtio_validate_features(VirtIODevice *vdev)
 {
     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 
+    if (virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM) &&
+        !virtio_vdev_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM)) {
+        return -EFAULT;
+    }
+
     if (k->validate_features) {
         return k->validate_features(vdev);
     } else {