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Subject: Re: [PATCH v39 21/24] x86/vdso: Implement a vDSO for Intel SGX
 enclave call
To:     Sean Christopherson <sean.j.christopherson@intel.com>,
        Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc:     x86@kernel.org, linux-sgx@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Andy Lutomirski <luto@amacapital.net>,
        Cedric Xing <cedric.xing@intel.com>, akpm@linux-foundation.org,
        andriy.shevchenko@linux.intel.com, asapek@google.com, bp@alien8.de,
        chenalexchen@google.com, conradparker@google.com,
        cyhanish@google.com, dave.hansen@intel.com, haitao.huang@intel.com,
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        ludloff@google.com, luto@kernel.org, nhorman@redhat.com,
        npmccallum@redhat.com, puiterwijk@redhat.com, rientjes@google.com,
        tglx@linutronix.de, yaozhangx@google.com, mikko.ylinen@intel.com
References: <20201003045059.665934-1-jarkko.sakkinen@linux.intel.com>
 <20201003045059.665934-22-jarkko.sakkinen@linux.intel.com>
 <20201006025703.GG15803@linux.intel.com>
From:   Jethro Beekman <jethro@fortanix.com>
Message-ID: <453c2d9b-0fd0-0d63-2bb9-096f255a6ff4@fortanix.com>
Date:   Tue, 6 Oct 2020 10:30:16 +0200
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--------------ms070309000707020104000907
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On 2020-10-06 04:57, Sean Christopherson wrote:
> On Sat, Oct 03, 2020 at 07:50:56AM +0300, Jarkko Sakkinen wrote:
>> From: Sean Christopherson <sean.j.christopherson@intel.com>
>> +	/* Validate that the reserved area contains only zeros. */
>> +	push	%rax
>> +	push	%rbx
>> +	mov	$SGX_ENCLAVE_RUN_RESERVED_START, %rbx
>> +1:
>> +	mov	(%rcx, %rbx), %rax
>> +	cmpq	$0, %rax
>> +	jne	.Linvalid_input
>> +
>> +	add	$8, %rbx
>> +	cmpq	$SGX_ENCLAVE_RUN_RESERVED_END, %rbx
>> +	jne	1b
>> +	pop	%rbx
>> +	pop	%rax
>=20
> This can more succinctly be (untested):
>=20
> 	movq	SGX_ENCLAVE_RUN_RESERVED_1(%rbp), %rbx=09
> 	orq	SGX_ENCLAVE_RUN_RESERVED_2(%rbp), %rbx=09
> 	orq	SGX_ENCLAVE_RUN_RESERVED_3(%rbp), %rbx=09
> 	jnz	.Linvalid_input
>=20
> Note, %rbx is getting clobbered anyways, no need to save/restore it.
>=20
>> diff --git a/arch/x86/include/uapi/asm/sgx.h b/arch/x86/include/uapi/a=
sm/sgx.h
>> index b6ba036a9b82..3dd2df44d569 100644
>> --- a/arch/x86/include/uapi/asm/sgx.h
>> +++ b/arch/x86/include/uapi/asm/sgx.h
>> @@ -74,4 +74,102 @@ struct sgx_enclave_provision {
>>  	__u64 attribute_fd;
>>  };
>> =20
>> +struct sgx_enclave_run;
>> +
>> +/**
>> + * typedef sgx_enclave_user_handler_t - Exit handler function accepte=
d by
>> + *					__vdso_sgx_enter_enclave()
>> + * @run:	Pointer to the caller provided struct sgx_enclave_run
>> + *
>> + * The register parameters contain the snapshot of their values at en=
clave
>> + * exit
>> + *
>> + * Return:
>> + *  0 or negative to exit vDSO
>> + *  positive to re-enter enclave (must be EENTER or ERESUME leaf)
>> + */
>> +typedef int (*sgx_enclave_user_handler_t)(long rdi, long rsi, long rd=
x,
>> +					  long rsp, long r8, long r9,
>> +					  struct sgx_enclave_run *run);
>> +
>> +/**
>> + * struct sgx_enclave_run - the execution context of __vdso_sgx_enter=
_enclave()
>> + * @tcs:			TCS used to enter the enclave
>> + * @user_handler:		User provided callback run on exception
>> + * @user_data:			Data passed to the user handler
>> + * @leaf:			The ENCLU leaf we were at (EENTER/ERESUME/EEXIT)
>> + * @exception_vector:		The interrupt vector of the exception
>> + * @exception_error_code:	The exception error code pulled out of the =
stack
>> + * @exception_addr:		The address that triggered the exception
>> + * @reserved			Reserved for possible future use
>> + */
>> +struct sgx_enclave_run {
>> +	__u64 tcs;
>> +	__u64 user_handler;
>> +	__u64 user_data;
>> +	__u32 leaf;
>=20
> I am still very strongly opposed to omitting exit_reason.  It is not at=
 all
> difficult to imagine scenarios where 'leaf' alone is insufficient for t=
he
> caller or its handler to deduce why the CPU exited the enclave.  E.g. s=
ee
> Jethro's request for intercepting interrupts.

Not entirely sure what this has to do with my request, I just expect to s=
ee leaf=3DERESUME in this case, I think? E.g. as you would see in EAX whe=
n calling ENCLU.

--
Jethro Beekman | Fortanix


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