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iommu/virtio: Add probe request

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When the device offers the probe feature, send a probe request for each
device managed by the IOMMU. Extract RESV_MEM information. When we
encounter a MSI doorbell region, set it up as a IOMMU_RESV_MSI region.
This will tell other subsystems that there is no need to map the MSI
doorbell in the virtio-iommu, because MSIs bypass it.

Tested-by: Bharat Bhushan <bharat.bhushan@nxp.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jean-Philippe Brucker
2019-01-15 12:19:58 +00:00
committed by Michael S. Tsirkin
parent edcd69ab9a
commit 2a5a314874
2 changed files with 187 additions and 6 deletions
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36
include/uapi/linux/virtio_iommu.h
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@@ -14,6 +14,7 @@
#define VIRTIO_IOMMU_F_DOMAIN_BITS 1
#define VIRTIO_IOMMU_F_MAP_UNMAP 2
#define VIRTIO_IOMMU_F_BYPASS 3
#define VIRTIO_IOMMU_F_PROBE 4
struct virtio_iommu_range {
__u64 start;
@@ -37,6 +38,7 @@ struct virtio_iommu_config {
#define VIRTIO_IOMMU_T_DETACH 0x02
#define VIRTIO_IOMMU_T_MAP 0x03
#define VIRTIO_IOMMU_T_UNMAP 0x04
#define VIRTIO_IOMMU_T_PROBE 0x05
/* Status types */
#define VIRTIO_IOMMU_S_OK 0x00
@@ -103,4 +105,38 @@ struct virtio_iommu_req_unmap {
struct virtio_iommu_req_tail tail;
};
#define VIRTIO_IOMMU_PROBE_T_NONE 0
#define VIRTIO_IOMMU_PROBE_T_RESV_MEM 1
#define VIRTIO_IOMMU_PROBE_T_MASK 0xfff
struct virtio_iommu_probe_property {
__le16 type;
__le16 length;
};
#define VIRTIO_IOMMU_RESV_MEM_T_RESERVED 0
#define VIRTIO_IOMMU_RESV_MEM_T_MSI 1
struct virtio_iommu_probe_resv_mem {
struct virtio_iommu_probe_property head;
__u8 subtype;
__u8 reserved[3];
__le64 start;
__le64 end;
};
struct virtio_iommu_req_probe {
struct virtio_iommu_req_head head;
__le32 endpoint;
__u8 reserved[64];
__u8 properties[];
/*
* Tail follows the variable-length properties array. No padding,
* property lengths are all aligned on 8 bytes.
*/
};
#endif