Introduce two ioctls: VDUSE_IOTLB_REG_UMEM and VDUSE_IOTLB_DEREG_UMEM to support registering and de-registering userspace memory for IOVA regions. Now it only supports registering userspace memory for bounce buffer region in virtio-vdpa case.
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| @@ -210,6 +210,29 @@ struct vduse_vq_eventfd { · 209 unmodified lines | ||
| 210 | 210 | */ |
| 211 | 211 | #define VDUSE_VQ_INJECT_IRQ _IOW(VDUSE_BASE, 0x17, __u32) |
| 212 | 212 | |
| 213 | +/** | |
| 214 | + * struct vduse_iova_umem - userspace memory configuration for one IOVA region | |
| 215 | + * @uaddr: start address of userspace memory, it must be aligned to page size | |
| 216 | + * @iova: start of the IOVA region | |
| 217 | + * @size: size of the IOVA region | |
| 218 | + * @reserved: for future use, needs to be initialized to zero | |
| 219 | + * | |
| 220 | + * Structure used by VDUSE_IOTLB_REG_UMEM and VDUSE_IOTLB_DEREG_UMEM | |
| 221 | + * ioctls to register/de-register userspace memory for IOVA regions | |
| 222 | + */ | |
| 223 | +struct vduse_iova_umem { | |
| 224 | + __u64 uaddr; | |
| 225 | + __u64 iova; | |
| 226 | + __u64 size; | |
| 227 | + __u64 reserved[3]; | |
| 228 | +}; | |
| 229 | + | |
| 230 | +/* Register userspace memory for IOVA regions */ | |
| 231 | +#define VDUSE_IOTLB_REG_UMEM _IOW(VDUSE_BASE, 0x18, struct vduse_iova_umem) | |
| 232 | + | |
| 233 | +/* De-register the userspace memory. Caller should set iova and size field. */ | |
| 234 | +#define VDUSE_IOTLB_DEREG_UMEM _IOW(VDUSE_BASE, 0x19, struct vduse_iova_umem) | |
| 235 | + | |
| 213 | 236 | /* The control messages definition for read(2)/write(2) on /dev/vduse/$NAME */ |
| 214 | 237 | |
| 215 | 238 | /** |