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virtio-devices: Translate queue addresses back to GVA if needed

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Whenever a virtio device is placed behind a vIOMMU, we have some code in
pci_common_config.rs to translate the queue addresses (descriptor table,
available ring and used ring) from GVA to GPA, so that they can be used
correctly.

But in case of vDPA, we also need to provide the queue addresses to the
vhost backend. And since the vhost backend deals with consistent IOVAs,
all addresses being provided should be GVAs if the device is placed
being a vIOMMU. For that reason, we perform a translation of the queue
addresses back from GPA to GVA if necessary, and only to be provided to
the vhost backend.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2022-04-04 14:14:19 +02:00
parent b3d7ad0b91
commit 590361aeb6
1 changed files with 26 additions and 5 deletions
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31
virtio-devices/src/vdpa.rs
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@ -19,10 +19,10 @@ use vhost::{
vhost_kern::VhostKernFeatures,
VhostBackend, VringConfigData,
};
use virtio_queue::Queue;
use virtio_queue::{Descriptor, Queue};
use vm_device::dma_mapping::ExternalDmaMapping;
use vm_memory::{GuestAddress, GuestAddressSpace, GuestMemory, GuestMemoryAtomic};
use vm_virtio::AccessPlatform;
use vm_virtio::{AccessPlatform, Translatable};
use vmm_sys_util::eventfd::EventFd;
#[derive(Error, Debug)]
@ -166,9 +166,30 @@ impl Vdpa {
queue_max_size,
queue_size,
flags: 0u32,
desc_table_addr: queue.state.desc_table.0,
used_ring_addr: queue.state.used_ring.0,
avail_ring_addr: queue.state.avail_ring.0,
desc_table_addr: queue
.state
.desc_table
.translate_gpa(
self.common.access_platform.as_ref(),
queue_size as usize * std::mem::size_of::<Descriptor>(),
)
.0,
used_ring_addr: queue
.state
.used_ring
.translate_gpa(
self.common.access_platform.as_ref(),
4 + queue_size as usize * 8,
)
.0,
avail_ring_addr: queue
.state
.avail_ring
.translate_gpa(
self.common.access_platform.as_ref(),
4 + queue_size as usize * 2,
)
.0,
log_addr: None,
};