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[V4,26/31] selftests/sgx: Introduce TCS initialization enclave operation

Message ID e3485cab7c764d4a37810f5e25c728ed83e66339.1649878359.git.reinette.chatre@intel.com (mailing list archive)
State Accepted
Commit b564982fda13be6314e49f2344e7c422565e34d3
Headers show
Series x86/sgx and selftests/sgx: Support SGX2 | expand

Commit Message

Reinette Chatre April 13, 2022, 9:10 p.m. UTC 
The Thread Control Structure (TCS) contains meta-data used by the
hardware to save and restore thread specific information when
entering/exiting the enclave. A TCS can be added to an initialized
enclave by first adding a new regular enclave page, initializing the
content of the new page from within the enclave, and then changing that
page's type to a TCS.

Support the initialization of a TCS from within the enclave.
The variable information needed that should be provided from outside
the enclave is the address of the TCS, address of the State Save Area
(SSA), and the entry point that the thread should use to enter the
enclave. With this information provided all needed fields of a TCS
can be initialized.

Acked-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
---
Changes since V3:
- Add Jarkko's Acked-by tag.

 tools/testing/selftests/sgx/defines.h   |  8 +++++++
 tools/testing/selftests/sgx/test_encl.c | 30 +++++++++++++++++++++++++
 2 files changed, 38 insertions(+)
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Patch

diff --git a/tools/testing/selftests/sgx/defines.h b/tools/testing/selftests/sgx/defines.h
index b638eb98c80c..d8587c971941 100644
--- a/tools/testing/selftests/sgx/defines.h
+++ b/tools/testing/selftests/sgx/defines.h
@@ -26,6 +26,7 @@  enum encl_op_type {
 	ENCL_OP_NOP,
 	ENCL_OP_EACCEPT,
 	ENCL_OP_EMODPE,
+	ENCL_OP_INIT_TCS_PAGE,
 	ENCL_OP_MAX,
 };
 
@@ -68,4 +69,11 @@  struct encl_op_emodpe {
 	uint64_t flags;
 };
 
+struct encl_op_init_tcs_page {
+	struct encl_op_header header;
+	uint64_t tcs_page;
+	uint64_t ssa;
+	uint64_t entry;
+};
+
 #endif /* DEFINES_H */
diff --git a/tools/testing/selftests/sgx/test_encl.c b/tools/testing/selftests/sgx/test_encl.c
index 5b6c65331527..c0d6397295e3 100644
--- a/tools/testing/selftests/sgx/test_encl.c
+++ b/tools/testing/selftests/sgx/test_encl.c
@@ -57,6 +57,35 @@  static void *memcpy(void *dest, const void *src, size_t n)
 	return dest;
 }
 
+static void *memset(void *dest, int c, size_t n)
+{
+	size_t i;
+
+	for (i = 0; i < n; i++)
+		((char *)dest)[i] = c;
+
+	return dest;
+}
+
+static void do_encl_init_tcs_page(void *_op)
+{
+	struct encl_op_init_tcs_page *op = _op;
+	void *tcs = (void *)op->tcs_page;
+	uint32_t val_32;
+
+	memset(tcs, 0, 16);			/* STATE and FLAGS */
+	memcpy(tcs + 16, &op->ssa, 8);		/* OSSA */
+	memset(tcs + 24, 0, 4);			/* CSSA */
+	val_32 = 1;
+	memcpy(tcs + 28, &val_32, 4);		/* NSSA */
+	memcpy(tcs + 32, &op->entry, 8);	/* OENTRY */
+	memset(tcs + 40, 0, 24);		/* AEP, OFSBASE, OGSBASE */
+	val_32 = 0xFFFFFFFF;
+	memcpy(tcs + 64, &val_32, 4);		/* FSLIMIT */
+	memcpy(tcs + 68, &val_32, 4);		/* GSLIMIT */
+	memset(tcs + 72, 0, 4024);		/* Reserved */
+}
+
 static void do_encl_op_put_to_buf(void *op)
 {
 	struct encl_op_put_to_buf *op2 = op;
@@ -100,6 +129,7 @@  void encl_body(void *rdi,  void *rsi)
 		do_encl_op_nop,
 		do_encl_eaccept,
 		do_encl_emodpe,
+		do_encl_init_tcs_page,
 	};
 
 	struct encl_op_header *op = (struct encl_op_header *)rdi;