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selftests/sgx: Introduce TCS initialization enclave operation 

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
This commit is contained in:
Reinette Chatre 2022-05-10 11:09:02 -07:00 committed by Dave Hansen
parent 7eb4370152
commit b564982fda
2 changed files with 38 additions and 0 deletions
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8
tools/testing/selftests/sgx/defines.h
View File

@ -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 */

30
tools/testing/selftests/sgx/test_encl.c
View File

@ -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;