On Tue, Oct 17, 2023 at 10:11:33PM -0700, Si-Wei Liu wrote:
RFC only. Not tested on vdpa-sim-blk with user virtual address.
Works fine with vdpa-sim-net which uses physical address to map.
This patch is based on top of [1].
[1] https://lore.kernel.org/virtualization/1696928580-7520-1-git-send-email-si-wei.liu@xxxxxxxxxx/
Signed-off-by: Si-Wei Liu <si-wei.liu@xxxxxxxxxx>
---
RFC v2:
- initialize iotlb to passthrough mode in device add
I tested this version and I didn't see any issue ;-)
Tested-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>
---
drivers/vdpa/vdpa_sim/vdpa_sim.c | 34 ++++++++++++++++++++++++--------
1 file changed, 26 insertions(+), 8 deletions(-)
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index 76d41058add9..2a0a6042d61d 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -151,13 +151,6 @@ static void vdpasim_do_reset(struct vdpasim *vdpasim)
&vdpasim->iommu_lock);
}
- for (i = 0; i < vdpasim->dev_attr.nas; i++) {
- vhost_iotlb_reset(&vdpasim->iommu[i]);
- vhost_iotlb_add_range(&vdpasim->iommu[i], 0, ULONG_MAX,
- 0, VHOST_MAP_RW);
- vdpasim->iommu_pt[i] = true;
- }
-
vdpasim->running = true;
spin_unlock(&vdpasim->iommu_lock);
@@ -259,8 +252,12 @@ struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr,
if (!vdpasim->iommu_pt)
goto err_iommu;
- for (i = 0; i < vdpasim->dev_attr.nas; i++)
+ for (i = 0; i < vdpasim->dev_attr.nas; i++) {
vhost_iotlb_init(&vdpasim->iommu[i], max_iotlb_entries, 0);
+ vhost_iotlb_add_range(&vdpasim->iommu[i], 0, ULONG_MAX, 0,
+ VHOST_MAP_RW);
+ vdpasim->iommu_pt[i] = true;
+ }
for (i = 0; i < dev_attr->nvqs; i++)
vringh_set_iotlb(&vdpasim->vqs[i].vring, &vdpasim->iommu[0],
@@ -637,6 +634,25 @@ static int vdpasim_set_map(struct vdpa_device *vdpa, unsigned int asid,
return ret;
}
+static int vdpasim_reset_map(struct vdpa_device *vdpa, unsigned int asid)
+{
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+
+ if (asid >= vdpasim->dev_attr.nas)
+ return -EINVAL;
+
+ spin_lock(&vdpasim->iommu_lock);
+ if (vdpasim->iommu_pt[asid])
+ goto out;
+ vhost_iotlb_reset(&vdpasim->iommu[asid]);
+ vhost_iotlb_add_range(&vdpasim->iommu[asid], 0, ULONG_MAX,
+ 0, VHOST_MAP_RW);
+ vdpasim->iommu_pt[asid] = true;
+out:
+ spin_unlock(&vdpasim->iommu_lock);
+ return 0;
+}
+
static int vdpasim_bind_mm(struct vdpa_device *vdpa, struct mm_struct *mm)
{
struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
@@ -759,6 +775,7 @@ static const struct vdpa_config_ops vdpasim_config_ops = {
.set_group_asid = vdpasim_set_group_asid,
.dma_map = vdpasim_dma_map,
.dma_unmap = vdpasim_dma_unmap,
+ .reset_map = vdpasim_reset_map,
.bind_mm = vdpasim_bind_mm,
.unbind_mm = vdpasim_unbind_mm,
.free = vdpasim_free,
@@ -796,6 +813,7 @@ static const struct vdpa_config_ops vdpasim_batch_config_ops = {
.get_iova_range = vdpasim_get_iova_range,
.set_group_asid = vdpasim_set_group_asid,
.set_map = vdpasim_set_map,
+ .reset_map = vdpasim_reset_map,
.bind_mm = vdpasim_bind_mm,
.unbind_mm = vdpasim_unbind_mm,
.free = vdpasim_free,
--
2.39.3
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