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| author | Jean-Philippe Brucker <jean-philippe@linaro.org> | 2021-12-01 18:33:22 +0100 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2021-12-06 15:03:05 +0100 |
| commit | f0f07a8462dc2a889745b9e436b4d86d66ccc787 (patch) | |
| tree | 659d89892bc258ef31b5584f11ad6b8962a46296 /drivers/iommu | |
| parent | iommu/virtio: Add definitions for VIRTIO_IOMMU_F_BYPASS_CONFIG (diff) | |
| download | linux-f0f07a8462dc2a889745b9e436b4d86d66ccc787.tar.xz linux-f0f07a8462dc2a889745b9e436b4d86d66ccc787.zip | |
iommu/virtio: Support bypass domains
The VIRTIO_IOMMU_F_BYPASS_CONFIG feature adds a new flag to the ATTACH
request, that creates a bypass domain. Use it to enable identity
domains.
When VIRTIO_IOMMU_F_BYPASS_CONFIG is not supported by the device, we
currently fail attaching to an identity domain. Future patches will
instead create identity mappings in this case.
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20211201173323.1045819-3-jean-philippe@linaro.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/virtio-iommu.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c index 80930ce04a16..14dfee76fd19 100644 --- a/drivers/iommu/virtio-iommu.c +++ b/drivers/iommu/virtio-iommu.c @@ -71,6 +71,7 @@ struct viommu_domain { struct rb_root_cached mappings; unsigned long nr_endpoints; + bool bypass; }; struct viommu_endpoint { @@ -587,7 +588,9 @@ static struct iommu_domain *viommu_domain_alloc(unsigned type) { struct viommu_domain *vdomain; - if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA) + if (type != IOMMU_DOMAIN_UNMANAGED && + type != IOMMU_DOMAIN_DMA && + type != IOMMU_DOMAIN_IDENTITY) return NULL; vdomain = kzalloc(sizeof(*vdomain), GFP_KERNEL); @@ -630,6 +633,17 @@ static int viommu_domain_finalise(struct viommu_endpoint *vdev, vdomain->map_flags = viommu->map_flags; vdomain->viommu = viommu; + if (domain->type == IOMMU_DOMAIN_IDENTITY) { + if (!virtio_has_feature(viommu->vdev, + VIRTIO_IOMMU_F_BYPASS_CONFIG)) { + ida_free(&viommu->domain_ids, vdomain->id); + vdomain->viommu = NULL; + return -EOPNOTSUPP; + } + + vdomain->bypass = true; + } + return 0; } @@ -691,6 +705,9 @@ static int viommu_attach_dev(struct iommu_domain *domain, struct device *dev) .domain = cpu_to_le32(vdomain->id), }; + if (vdomain->bypass) + req.flags |= cpu_to_le32(VIRTIO_IOMMU_ATTACH_F_BYPASS); + for (i = 0; i < fwspec->num_ids; i++) { req.endpoint = cpu_to_le32(fwspec->ids[i]); @@ -1132,6 +1149,7 @@ static unsigned int features[] = { VIRTIO_IOMMU_F_DOMAIN_RANGE, VIRTIO_IOMMU_F_PROBE, VIRTIO_IOMMU_F_MMIO, + VIRTIO_IOMMU_F_BYPASS_CONFIG, }; static struct virtio_device_id id_table[] = { |