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selftests/sgx: Introduce TCS initialization enclave operation
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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.

Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Jarkko Sakkinen <jarkko@kernel.org>
Link: https://lkml.kernel.org/r/bad6052056188bde753a54313da1ac8f1e29088a.1652137848.git.reinette.chatre@intel.com
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Reinette Chatre authored and Dave Hansen committed Jul 7, 2022
1 parent 7eb4370 commit b564982
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Showing 2 changed files with 38 additions and 0 deletions.
8 changes: 8 additions & 0 deletions tools/testing/selftests/sgx/defines.h
Original file line number Diff line number Diff line change
Expand Up @@ -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,
};

Expand Down Expand Up @@ -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 */
30 changes: 30 additions & 0 deletions tools/testing/selftests/sgx/test_encl.c
Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand Down Expand Up @@ -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;
Expand Down

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