[PATCH v4 10/18] nitro_enclaves: Add logic for enclave image load info

[Andra Paraschiv <andraprs@amazon.com>]

Before setting the memory regions for the enclave, the enclave image
needs to be placed in memory. After the memory regions are set, this
memory cannot be used anymore by the VM, being carved out.

Add ioctl command logic to get the offset in enclave memory where to
place the enclave image. Then the user space tooling copies the enclave
image in the memory using the given memory offset.

Signed-off-by: Andra Paraschiv <andraprs@amazon.com>
---
Changelog

v3 -> v4

* Use dev_err instead of custom NE log pattern.
* Set enclave image load offset based on flags.
* Update the naming for the ioctl command from metadata to info.

v2 -> v3

* No changes.

v1 -> v2

* New in v2.
---
 drivers/virt/nitro_enclaves/ne_misc_dev.c | 25 +++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/virt/nitro_enclaves/ne_misc_dev.c b/drivers/virt/nitro_enclaves/ne_misc_dev.c
index d6777008f685..cfdefa52ed2a 100644
--- a/drivers/virt/nitro_enclaves/ne_misc_dev.c
+++ b/drivers/virt/nitro_enclaves/ne_misc_dev.c
@@ -536,6 +536,31 @@ static long ne_enclave_ioctl(struct file *file, unsigned int cmd,
 		return rc;
 	}
 
+	case NE_GET_IMAGE_LOAD_INFO: {
+		struct ne_image_load_info image_load_info = {};
+
+		if (copy_from_user(&image_load_info, (void *)arg,
+				   sizeof(image_load_info))) {
+			dev_err_ratelimited(ne_misc_dev.this_device,
+					    "Error in copy from user\n");
+
+			return -EFAULT;
+		}
+
+		if (image_load_info.flags == NE_EIF_IMAGE)
+			image_load_info.memory_offset = NE_EIF_LOAD_OFFSET;
+
+		if (copy_to_user((void *)arg, &image_load_info,
+				 sizeof(image_load_info))) {
+			dev_err_ratelimited(ne_misc_dev.this_device,
+					    "Error in copy to user\n");
+
+			return -EFAULT;
+		}
+
+		return 0;
+	}
+
 	default:
 		return -ENOTTY;
 	}
-- 
2.20.1 (Apple Git-117)




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