greq: add structure layout tests

Add tests to verify that the layout for the attestation report and
the SNP_GUEST_REQUEST command structures are correct.

Signed-off-by: Carlos López <carlos.lopez@suse.com>

Cargo.toml

@@ -33,3 +33,6 @@ test = { version = "0.1.0", path = "test" }
 default = ["enable-stacktrace"]
 enable-stacktrace = []
 enable-gdb = ["dep:gdbstub", "dep:gdbstub_arch"]
+
+[dev-dependencies]
+memoffset = "0.9.0"

src/greq/msg.rs

@@ -551,6 +551,29 @@ mod tests {
     use super::*;
     use crate::mm::alloc::{TestRootMem, DEFAULT_TEST_MEMORY_SIZE};
     use crate::sev::secrets_page::VMPCK_SIZE;
+    use memoffset::offset_of;
+
+    #[test]
+    fn test_snp_guest_request_hdr_offsets() {
+        assert_eq!(offset_of!(SnpGuestRequestMsgHdr, authtag), 0);
+        assert_eq!(offset_of!(SnpGuestRequestMsgHdr, msg_seqno), 0x20);
+        assert_eq!(offset_of!(SnpGuestRequestMsgHdr, rsvd1), 0x28);
+        assert_eq!(offset_of!(SnpGuestRequestMsgHdr, algo), 0x30);
+        assert_eq!(offset_of!(SnpGuestRequestMsgHdr, hdr_version), 0x31);
+        assert_eq!(offset_of!(SnpGuestRequestMsgHdr, hdr_sz), 0x32);
+        assert_eq!(offset_of!(SnpGuestRequestMsgHdr, msg_type), 0x34);
+        assert_eq!(offset_of!(SnpGuestRequestMsgHdr, msg_version), 0x35);
+        assert_eq!(offset_of!(SnpGuestRequestMsgHdr, msg_sz), 0x36);
+        assert_eq!(offset_of!(SnpGuestRequestMsgHdr, rsvd2), 0x38);
+        assert_eq!(offset_of!(SnpGuestRequestMsgHdr, msg_vmpck), 0x3c);
+        assert_eq!(offset_of!(SnpGuestRequestMsgHdr, rsvd3), 0x3d);
+    }
+
+    #[test]
+    fn test_snp_guest_request_msg_offsets() {
+        assert_eq!(offset_of!(SnpGuestRequestMsg, hdr), 0);
+        assert_eq!(offset_of!(SnpGuestRequestMsg, pld), 0x60);
+    }
 
     #[test]
     fn test_requestmsg_boxed_new() {

src/greq/pld_report.rs

@@ -198,3 +198,59 @@ pub struct AttestationReport {
     /// Signature of bytes 0h to 29Fh inclusive of this report
     signature: Signature,
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use memoffset::offset_of;
+
+    #[test]
+    fn test_snp_report_request_offsets() {
+        assert_eq!(offset_of!(SnpReportRequest, user_data), 0x0);
+        assert_eq!(offset_of!(SnpReportRequest, vmpl), 0x40);
+        assert_eq!(offset_of!(SnpReportRequest, flags), 0x44);
+        assert_eq!(offset_of!(SnpReportRequest, rsvd), 0x48);
+    }
+
+    #[test]
+    fn test_snp_report_response_offsets() {
+        assert_eq!(offset_of!(SnpReportResponse, status), 0x0);
+        assert_eq!(offset_of!(SnpReportResponse, report_size), 0x4);
+        assert_eq!(offset_of!(SnpReportResponse, _reserved), 0x8);
+        assert_eq!(offset_of!(SnpReportResponse, report), 0x20);
+    }
+
+    #[test]
+    fn test_ecdsa_p384_sha384_signature_offsets() {
+        assert_eq!(offset_of!(Signature, r), 0x0);
+        assert_eq!(offset_of!(Signature, s), 0x48);
+        assert_eq!(offset_of!(Signature, reserved), 0x90);
+    }
+
+    #[test]
+    fn test_attestation_report_offsets() {
+        assert_eq!(offset_of!(AttestationReport, version), 0x0);
+        assert_eq!(offset_of!(AttestationReport, guest_svn), 0x4);
+        assert_eq!(offset_of!(AttestationReport, policy), 0x8);
+        assert_eq!(offset_of!(AttestationReport, family_id), 0x10);
+        assert_eq!(offset_of!(AttestationReport, image_id), 0x20);
+        assert_eq!(offset_of!(AttestationReport, vmpl), 0x30);
+        assert_eq!(offset_of!(AttestationReport, signature_algo), 0x34);
+        assert_eq!(offset_of!(AttestationReport, platform_version), 0x38);
+        assert_eq!(offset_of!(AttestationReport, platform_info), 0x40);
+        assert_eq!(offset_of!(AttestationReport, flags), 0x48);
+        assert_eq!(offset_of!(AttestationReport, reserved0), 0x4c);
+        assert_eq!(offset_of!(AttestationReport, report_data), 0x50);
+        assert_eq!(offset_of!(AttestationReport, measurement), 0x90);
+        assert_eq!(offset_of!(AttestationReport, host_data), 0xc0);
+        assert_eq!(offset_of!(AttestationReport, id_key_digest), 0xe0);
+        assert_eq!(offset_of!(AttestationReport, author_key_digest), 0x110);
+        assert_eq!(offset_of!(AttestationReport, report_id), 0x140);
+        assert_eq!(offset_of!(AttestationReport, report_id_ma), 0x160);
+        assert_eq!(offset_of!(AttestationReport, reported_tcb), 0x180);
+        assert_eq!(offset_of!(AttestationReport, reserved1), 0x188);
+        assert_eq!(offset_of!(AttestationReport, chip_id), 0x1a0);
+        assert_eq!(offset_of!(AttestationReport, reserved2), 0x1e0);
+        assert_eq!(offset_of!(AttestationReport, signature), 0x2a0);
+    }
+}