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iommu/virtio: Detach domain on endpoint release

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When an endpoint is released, for example a PCIe VF being destroyed or a
function hot-unplugged, it should be detached from its domain. Send a
DETACH request.

Fixes: edcd69ab9a ("iommu: Add virtio-iommu driver")
Reported-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Link: https://lore.kernel.org/all/15bf1b00-3aa0-973a-3a86-3fa5c4d41d2c@daynix.com/
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Tested-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Link: https://lore.kernel.org/r/20230515113946.1017624-2-jean-philippe@linaro.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jean-Philippe Brucker 2023-05-15 12:39:48 +01:00 committed by Joerg Roedel
parent 44c026a73b
commit 809d0810e3
1 changed files with 24 additions and 0 deletions
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24
drivers/iommu/virtio-iommu.c
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@ -788,6 +788,29 @@ static int viommu_attach_dev(struct iommu_domain *domain, struct device *dev)
return 0;
}
static void viommu_detach_dev(struct viommu_endpoint *vdev)
{
int i;
struct virtio_iommu_req_detach req;
struct viommu_domain *vdomain = vdev->vdomain;
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(vdev->dev);
if (!vdomain)
return;
req = (struct virtio_iommu_req_detach) {
.head.type = VIRTIO_IOMMU_T_DETACH,
.domain = cpu_to_le32(vdomain->id),
};
for (i = 0; i < fwspec->num_ids; i++) {
req.endpoint = cpu_to_le32(fwspec->ids[i]);
WARN_ON(viommu_send_req_sync(vdev->viommu, &req, sizeof(req)));
}
vdomain->nr_endpoints--;
vdev->vdomain = NULL;
}
static int viommu_map_pages(struct iommu_domain *domain, unsigned long iova,
phys_addr_t paddr, size_t pgsize, size_t pgcount,
int prot, gfp_t gfp, size_t *mapped)
@ -990,6 +1013,7 @@ static void viommu_release_device(struct device *dev)
{
struct viommu_endpoint *vdev = dev_iommu_priv_get(dev);
viommu_detach_dev(vdev);
iommu_put_resv_regions(dev, &vdev->resv_regions);
kfree(vdev);
}