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vhost-iova-tree: Implement an IOVA-only tree

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Creates and supports an IOVA-only tree to support a SVQ IOVA->HVA and
GPA->IOVA tree for host-only and guest-backed memory, respectively, in
the next patch.

The IOVA allocator still allocates an IOVA range but now adds this range
to the IOVA-only tree as well as to the full IOVA->HVA tree.

In the next patch, the full IOVA->HVA tree will be split into a partial
SVQ IOVA->HVA tree and a GPA->IOVA tree. The motivation behind having an
IOVA-only tree was to have a single tree that would keep track of all
allocated IOVA ranges between the partial SVQ IOVA->HVA and GPA->IOVA
trees.

Signed-off-by: Jonah Palmer <jonah.palmer@oracle.com>
Acked-by: Eugenio Pérez <eperezma@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Message-Id: <20250217144936.3589907-2-jonah.palmer@oracle.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jonah Palmer 2025-02-17 09:49:32 -05:00 • committed by Michael S. Tsirkin
parent 3684717b74
commit 92cf61e708
4 changed files with 51 additions and 17 deletions
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10
net/vhost-vdpa.c
View file

@ -510,14 +510,20 @@ static int vhost_vdpa_cvq_map_buf(struct vhost_vdpa *v, void *buf, size_t size,
bool write)
{
DMAMap map = {};
hwaddr taddr = (hwaddr)(uintptr_t)buf;
int r;
map.translated_addr = (hwaddr)(uintptr_t)buf;
map.size = size - 1;
map.perm = write ? IOMMU_RW : IOMMU_RO,
r = vhost_iova_tree_map_alloc(v->shared->iova_tree, &map);
r = vhost_iova_tree_map_alloc(v->shared->iova_tree, &map, taddr);
if (unlikely(r != IOVA_OK)) {
error_report("Cannot map injected element");
if (map.translated_addr == taddr) {
error_report("Insertion to IOVA->HVA tree failed");
/* Remove the mapping from the IOVA-only tree */
goto dma_map_err;
}
return r;
}