6.6-stable review patch. If anyone has any objections, please let me know.
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From: Jo Van Bulck jo.vanbulck@cs.kuleuven.be
[ Upstream commit 853a57a43ebdb8c024160c1a0990bae85f4bcc2f ]
Add the "memory" clobber to the EMODPE and EACCEPT asm blocks to tell the compiler the assembly code accesses to the secinfo struct. This ensures the compiler treats the asm block as a memory barrier and the write to secinfo will be visible to ENCLU.
Fixes: 20404a808593 ("selftests/sgx: Add test for EPCM permission changes") Signed-off-by: Jo Van Bulck jo.vanbulck@cs.kuleuven.be Signed-off-by: Dave Hansen dave.hansen@linux.intel.com Reviewed-by: Kai Huang kai.huang@intel.com Reviewed-by: Jarkko Sakkinen jarkko@kernel.org Link: https://lore.kernel.org/all/20231005153854.25566-4-jo.vanbulck%40cs.kuleuven... Signed-off-by: Sasha Levin sashal@kernel.org --- tools/testing/selftests/sgx/test_encl.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/tools/testing/selftests/sgx/test_encl.c b/tools/testing/selftests/sgx/test_encl.c index c0d6397295e3..ae791df3e5a5 100644 --- a/tools/testing/selftests/sgx/test_encl.c +++ b/tools/testing/selftests/sgx/test_encl.c @@ -24,10 +24,11 @@ static void do_encl_emodpe(void *_op) secinfo.flags = op->flags;
asm volatile(".byte 0x0f, 0x01, 0xd7" - : + : /* no outputs */ : "a" (EMODPE), "b" (&secinfo), - "c" (op->epc_addr)); + "c" (op->epc_addr) + : "memory" /* read from secinfo pointer */); }
static void do_encl_eaccept(void *_op) @@ -42,7 +43,8 @@ static void do_encl_eaccept(void *_op) : "=a" (rax) : "a" (EACCEPT), "b" (&secinfo), - "c" (op->epc_addr)); + "c" (op->epc_addr) + : "memory" /* read from secinfo pointer */);
op->ret = rax; }