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iommu/virtio: Add event queue

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The event queue offers a way for the device to report access faults from
endpoints. It is implemented on virtqueue #1. Whenever the host needs to
signal a fault, it fills one of the buffers offered by the guest and
interrupts 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 12:19:59 +00:00
committed by Michael S. Tsirkin
parent 2a5a314874
commit 169a126c6e
2 changed files with 125 additions and 9 deletions
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19
include/uapi/linux/virtio_iommu.h
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@@ -139,4 +139,23 @@ struct virtio_iommu_req_probe {
*/
};
/* Fault types */
#define VIRTIO_IOMMU_FAULT_R_UNKNOWN 0
#define VIRTIO_IOMMU_FAULT_R_DOMAIN 1
#define VIRTIO_IOMMU_FAULT_R_MAPPING 2
#define VIRTIO_IOMMU_FAULT_F_READ (1 << 0)
#define VIRTIO_IOMMU_FAULT_F_WRITE (1 << 1)
#define VIRTIO_IOMMU_FAULT_F_EXEC (1 << 2)
#define VIRTIO_IOMMU_FAULT_F_ADDRESS (1 << 8)
struct virtio_iommu_fault {
__u8 reason;
__u8 reserved[3];
__le32 flags;
__le32 endpoint;
__u8 reserved2[4];
__le64 address;
};
#endif