linux-kernel - Re: [PATCH v6 06/13] selftests/sgx: Remove redundant enclave base address save/restore

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Message-Id: <CVS5EA0J0L3K.3KYP9Y9K9DRSY@suppilovahvero>
Date:   Mon, 25 Sep 2023 19:44:20 +0300
From:   "Jarkko Sakkinen" <jarkko@...nel.org>
To:     "Jo Van Bulck" <jo.vanbulck@...kuleuven.be>, <kai.huang@...el.com>,
        <linux-sgx@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Cc:     <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH v6 06/13] selftests/sgx: Remove redundant enclave base
 address save/restore

On Thu Sep 21, 2023 at 5:35 PM EEST, Jo Van Bulck wrote:
> Remove redundant push/pop pair that stores and restores the enclave base
> address in the test enclave, as it is never used after the pop and can
> anyway be easily retrieved via the __encl_base symbol.
>
> Signed-off-by: Jo Van Bulck <jo.vanbulck@...kuleuven.be>
> Acked-by: Kai Huang <kai.huang@...el.com>
> ---
>  tools/testing/selftests/sgx/test_encl_bootstrap.S | 3 ---
>  1 file changed, 3 deletions(-)
>
> diff --git a/tools/testing/selftests/sgx/test_encl_bootstrap.S b/tools/testing/selftests/sgx/test_encl_bootstrap.S
> index 03ae0f57e29d..e0ce993d3f2c 100644
> --- a/tools/testing/selftests/sgx/test_encl_bootstrap.S
> +++ b/tools/testing/selftests/sgx/test_encl_bootstrap.S
> @@ -55,12 +55,9 @@ encl_entry_core:
>  	push	%rax
>  
>  	push	%rcx # push the address after EENTER
> -	push	%rbx # push the enclave base address
>  
>  	call	encl_body
>  
> -	pop	%rbx # pop the enclave base address
> -
>  	/* Clear volatile GPRs, except RAX (EEXIT function). */
>  	xor     %rcx, %rcx
>  	xor     %rdx, %rdx
> -- 
> 2.25.1

Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>

BR, Jarkko