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vhost: translate incoming log address to GPA

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When IOMMU is enabled the incoming log address is in IOVA space. In that
case, look in IOTLB table and translate the resulting HVA to GPA.

If IOMMU is not enabled, the incoming log address is already a GPA so no
transformation is needed.

Fixes: 69c90e98f4 ("vhost: enable IOMMU support")
Cc: stable@dpdk.org

Signed-off-by: Adrian Moreno <amorenoz@redhat.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
This commit is contained in:
Adrian Moreno 2019-10-09 13:54:30 +02:00 committed by Ferruh Yigit
parent a44c4e1e3a
commit fbda9f1459
3 changed files with 62 additions and 1 deletions
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1
lib/librte_vhost/vhost.c
View File

@ -382,6 +382,7 @@ vring_invalidate(struct virtio_net *dev, struct vhost_virtqueue *vq)
vq->desc = NULL;
vq->avail = NULL;
vq->used = NULL;
vq->log_guest_addr = 0;
if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
vhost_user_iotlb_wr_unlock(vq);

20
lib/librte_vhost/vhost.h
View File

@ -447,6 +447,26 @@ gpa_to_hpa(struct virtio_net *dev, uint64_t gpa, uint64_t size)
return 0;
}
static __rte_always_inline uint64_t
hva_to_gpa(struct virtio_net *dev, uint64_t vva, uint64_t len)
{
struct rte_vhost_mem_region *r;
uint32_t i;
if (unlikely(!dev || !dev->mem))
return 0;
for (i = 0; i < dev->mem->nregions; i++) {
r = &dev->mem->regions[i];
if (vva >= r->host_user_addr &&
vva + len < r->host_user_addr + r->size) {
return r->guest_phys_addr + vva - r->host_user_addr;
}
}
return 0;
}
static __rte_always_inline struct virtio_net *
get_device(int vid)
{

42
lib/librte_vhost/vhost_user.c
View File

@ -575,6 +575,39 @@ ring_addr_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
return qva_to_vva(dev, ra, size);
}
/*
* Converts vring log address to GPA
* If IOMMU is enabled, the log address is IOVA
* If IOMMU not enabled, the log address is already GPA
*/
static uint64_t
translate_log_addr(struct virtio_net *dev, struct vhost_virtqueue *vq,
uint64_t log_addr)
{
if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) {
const uint64_t exp_size = sizeof(struct vring_used) +
sizeof(struct vring_used_elem) * vq->size;
uint64_t hva, gpa;
uint64_t size = exp_size;
hva = vhost_iova_to_vva(dev, vq, log_addr,
&size, VHOST_ACCESS_RW);
if (size != exp_size)
return 0;
gpa = hva_to_gpa(dev, hva, exp_size);
if (!gpa) {
RTE_LOG(ERR, VHOST_CONFIG,
"VQ: Failed to find GPA for log_addr: 0x%" PRIx64 " hva: 0x%" PRIx64 "\n",
log_addr, hva);
return 0;
}
return gpa;
} else
return log_addr;
}
static struct virtio_net *
translate_ring_addresses(struct virtio_net *dev, int vq_index)
{
@ -682,7 +715,14 @@ translate_ring_addresses(struct virtio_net *dev, int vq_index)
vq->last_avail_idx = vq->used->idx;
}
vq->log_guest_addr = addr->log_guest_addr;
vq->log_guest_addr =
translate_log_addr(dev, vq, addr->log_guest_addr);
if (vq->log_guest_addr == 0) {
RTE_LOG(DEBUG, VHOST_CONFIG,
"(%d) failed to map log_guest_addr .\n",
dev->vid);
return dev;
}
vq->access_ok = 1;
VHOST_LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address desc: %p\n",