Re: [RFC PATCH v3 3/4] selftests/sgx: add len field for EACCEPT op

[Jarkko Sakkinen <jarkko@kernel.org>]

On Mon, Nov 07, 2022 at 02:02:11PM -0800, Haitao Huang wrote:
> So we can EACCEPT multiple pages inside enclave without EEXIT,
> preparing for testing with MADV_WILLNEED for ranges bigger than
> a single page.
> 
> Signed-off-by: Haitao Huang <haitao.huang@linux.intel.com>
> ---
>  tools/testing/selftests/sgx/defines.h   |  1 +
>  tools/testing/selftests/sgx/test_encl.c | 20 ++++++++++++++------
>  2 files changed, 15 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/testing/selftests/sgx/defines.h b/tools/testing/selftests/sgx/defines.h
> index d8587c971941..8578e773d3d8 100644
> --- a/tools/testing/selftests/sgx/defines.h
> +++ b/tools/testing/selftests/sgx/defines.h
> @@ -60,6 +60,7 @@ struct encl_op_eaccept {
>  	struct encl_op_header header;
>  	uint64_t epc_addr;
>  	uint64_t flags;
> +	uint64_t len;
>  	uint64_t ret;
>  };
>  
> diff --git a/tools/testing/selftests/sgx/test_encl.c b/tools/testing/selftests/sgx/test_encl.c
> index c0d6397295e3..fc797385200b 100644
> --- a/tools/testing/selftests/sgx/test_encl.c
> +++ b/tools/testing/selftests/sgx/test_encl.c
> @@ -35,14 +35,22 @@ static void do_encl_eaccept(void *_op)
>  	struct sgx_secinfo secinfo __aligned(sizeof(struct sgx_secinfo)) = {0};
>  	struct encl_op_eaccept *op = _op;
>  	int rax;

Should be empty line after declarations.

> +	if (op->len == 0)
> +		op->len = 4096;

What is this?

>  
>  	secinfo.flags = op->flags;
> -
> -	asm volatile(".byte 0x0f, 0x01, 0xd7"
> -				: "=a" (rax)
> -				: "a" (EACCEPT),
> -				  "b" (&secinfo),
> -				  "c" (op->epc_addr));
> +	for (uint64_t addr = op->epc_addr;
> +			addr < op->epc_addr + op->len; addr += 4096) {
> +		asm volatile(".byte 0x0f, 0x01, 0xd7"
> +					: "=a" (rax)
> +					: "a" (EACCEPT),
> +					  "b" (&secinfo),
> +					  "c" (addr));
> +		if (rax) {
> +			op->ret = rax;
> +			return;
> +		}
> +	}
>  
>  	op->ret = rax;
>  }
> -- 
> 2.25.1
> 

BR, Jarkko