Commit c611c76417f5 ("virtio: add MemoryListener to cache ring
translations") registers a memory listener to dma_as. This may not
work when IOMMU is enabled: dma_as(bus_master_as) were correctly
initialized in pcibus_machine_done() after virtio_realize() where we
try to register listener and initialize address space cache.
Fixing this by:
- delay the listener register to status set
- reset dma_as before trying to initialize address spaces to make sure
it works even IOMMU were created after virtio device
Fixes: c611c76417f5 ("virtio: add MemoryListener to cache ring translations")
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
hw/virtio/virtio.c | 29 ++++++++++++++++++++++++++++-
include/hw/virtio/virtio.h | 1 +
2 files changed, 29 insertions(+), 1 deletion(-)
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 23483c7..179030c 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -1084,9 +1084,22 @@ int virtio_set_status(VirtIODevice *vdev, uint8_t val)
}
}
}
+
+ virtio_device_reset_dma_as(vdev);
+
+ if (val == (VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER)) {
+ memory_listener_unregister(&vdev->listener);
+ memory_listener_register(&vdev->listener, vdev->dma_as);
+ }
+
if (k->set_status) {
k->set_status(vdev, val);
}
+
+ if (val == 0) {
+ memory_listener_unregister(&vdev->listener);
+ }
+
vdev->status = val;
return 0;
}
@@ -2402,7 +2415,6 @@ static void virtio_device_realize(DeviceState *dev, Error **errp)
}
vdev->listener.commit = virtio_memory_listener_commit;
- memory_listener_register(&vdev->listener, vdev->dma_as);
}
static void virtio_device_unrealize(DeviceState *dev, Error **errp)
@@ -2576,6 +2588,21 @@ bool virtio_device_ioeventfd_enabled(VirtIODevice *vdev)
return virtio_bus_ioeventfd_enabled(vbus);
}
+void virtio_device_reset_dma_as(VirtIODevice *vdev)
+{
+ DeviceState *qdev = DEVICE(vdev);
+ BusState *qbus = BUS(qdev_get_parent_bus(qdev));
+ VirtioBusState *bus = VIRTIO_BUS(qbus);
+ VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(bus);
+ bool has_iommu = virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM);
+
+ if (klass->get_dma_as != NULL && has_iommu) {
+ vdev->dma_as = klass->get_dma_as(qbus->parent);
+ } else {
+ vdev->dma_as = &address_space_memory;
+ }
+}
+
static const TypeInfo virtio_device_info = {
.name = TYPE_VIRTIO_DEVICE,
.parent = TYPE_DEVICE,
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index 15efcf2..f7e0b4a 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -289,6 +289,7 @@ void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx,
VirtIOHandleAIOOutput handle_output);
VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector);
VirtQueue *virtio_vector_next_queue(VirtQueue *vq);
+void virtio_device_reset_dma_as(VirtIODevice *vdev);
static inline void virtio_add_feature(uint64_t *features, unsigned int fbit)
{
--
2.7.4
On 03/03/2017 10:06, Jason Wang wrote: > Commit c611c76417f5 ("virtio: add MemoryListener to cache ring > translations") registers a memory listener to dma_as. This may not > work when IOMMU is enabled: dma_as(bus_master_as) were correctly > initialized in pcibus_machine_done() after virtio_realize() where we > try to register listener and initialize address space cache. > > Fixing this by: > > - delay the listener register to status set > - reset dma_as before trying to initialize address spaces to make sure > it works even IOMMU were created after virtio device > > Fixes: c611c76417f5 ("virtio: add MemoryListener to cache ring translations") > Cc: Paolo Bonzini <pbonzini@redhat.com> > Signed-off-by: Jason Wang <jasowang@redhat.com> For virtio 0.9 it is valid to use the virtio device while the status is 0. You can add a function virtio_set_dma_as to generic virtio that does a MemoryListener unregister+register, then PCI can call it when the AddressSpace is ready. Paolo > --- > hw/virtio/virtio.c | 29 ++++++++++++++++++++++++++++- > include/hw/virtio/virtio.h | 1 + > 2 files changed, 29 insertions(+), 1 deletion(-) > > diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c > index 23483c7..179030c 100644 > --- a/hw/virtio/virtio.c > +++ b/hw/virtio/virtio.c > @@ -1084,9 +1084,22 @@ int virtio_set_status(VirtIODevice *vdev, uint8_t val) > } > } > } > + > + virtio_device_reset_dma_as(vdev); > + > + if (val == (VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER)) { > + memory_listener_unregister(&vdev->listener); > + memory_listener_register(&vdev->listener, vdev->dma_as); > + } > + > if (k->set_status) { > k->set_status(vdev, val); > } > + > + if (val == 0) { > + memory_listener_unregister(&vdev->listener); > + } > + > vdev->status = val; > return 0; > } > @@ -2402,7 +2415,6 @@ static void virtio_device_realize(DeviceState *dev, Error **errp) > } > > vdev->listener.commit = virtio_memory_listener_commit; > - memory_listener_register(&vdev->listener, vdev->dma_as); > } > > static void virtio_device_unrealize(DeviceState *dev, Error **errp) > @@ -2576,6 +2588,21 @@ bool virtio_device_ioeventfd_enabled(VirtIODevice *vdev) > return virtio_bus_ioeventfd_enabled(vbus); > } > > +void virtio_device_reset_dma_as(VirtIODevice *vdev) > +{ > + DeviceState *qdev = DEVICE(vdev); > + BusState *qbus = BUS(qdev_get_parent_bus(qdev)); > + VirtioBusState *bus = VIRTIO_BUS(qbus); > + VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(bus); > + bool has_iommu = virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM); > + > + if (klass->get_dma_as != NULL && has_iommu) { > + vdev->dma_as = klass->get_dma_as(qbus->parent); > + } else { > + vdev->dma_as = &address_space_memory; > + } > +} > + > static const TypeInfo virtio_device_info = { > .name = TYPE_VIRTIO_DEVICE, > .parent = TYPE_DEVICE, > diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h > index 15efcf2..f7e0b4a 100644 > --- a/include/hw/virtio/virtio.h > +++ b/include/hw/virtio/virtio.h > @@ -289,6 +289,7 @@ void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx, > VirtIOHandleAIOOutput handle_output); > VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector); > VirtQueue *virtio_vector_next_queue(VirtQueue *vq); > +void virtio_device_reset_dma_as(VirtIODevice *vdev); > > static inline void virtio_add_feature(uint64_t *features, unsigned int fbit) > { >
On 2017年03月03日 20:56, Paolo Bonzini wrote: > > On 03/03/2017 10:06, Jason Wang wrote: >> Commit c611c76417f5 ("virtio: add MemoryListener to cache ring >> translations") registers a memory listener to dma_as. This may not >> work when IOMMU is enabled: dma_as(bus_master_as) were correctly >> initialized in pcibus_machine_done() after virtio_realize() where we >> try to register listener and initialize address space cache. >> >> Fixing this by: >> >> - delay the listener register to status set >> - reset dma_as before trying to initialize address spaces to make sure >> it works even IOMMU were created after virtio device >> >> Fixes: c611c76417f5 ("virtio: add MemoryListener to cache ring translations") >> Cc: Paolo Bonzini <pbonzini@redhat.com> >> Signed-off-by: Jason Wang <jasowang@redhat.com> > For virtio 0.9 it is valid to use the virtio device while the status is 0. > > You can add a function virtio_set_dma_as to generic virtio that does a > MemoryListener unregister+register, then PCI can call it when the > AddressSpace is ready. > > Paolo > > Ok, will post a new version. Thanks
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