# Re: \[PATCH v21 05/26\] x86/fpu/xstate: Introduce CET MSR and XSAVES supervisor states

- From: Yu, Yu-cheng \<hidden\>
- Date: 2021-02-24 15:58:32 
- List: linux-arch
- Page: https://ratatoskr.run/linux-arch/2021/02/6278053
- Thread: https://ratatoskr.run/linux-doc/2021/02/6272416/t.md

```text
On 2/24/2021 7:34 AM, Borislav Petkov wrote:
> On Wed, Feb 17, 2021 at 02:27:09PM -0800, Yu-cheng Yu wrote:
>> diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
>> index 546d6ecf0a35..fae6b3ea1f6d 100644
>> --- a/arch/x86/include/asm/msr-index.h
>> +++ b/arch/x86/include/asm/msr-index.h
>> @@ -933,4 +933,23 @@
>>   #define MSR_VM_IGNNE                    0xc0010115
>>   #define MSR_VM_HSAVE_PA                 0xc0010117
>>   
>> +/* Control-flow Enforcement Technology MSRs */
>> +#define MSR_IA32_U_CET		0x6a0 /* user mode cet setting */
>> +#define MSR_IA32_S_CET		0x6a2 /* kernel mode cet setting */
>> +#define CET_SHSTK_EN		BIT_ULL(0)
>> +#define CET_WRSS_EN		BIT_ULL(1)
>> +#define CET_ENDBR_EN		BIT_ULL(2)
>> +#define CET_LEG_IW_EN		BIT_ULL(3)
>> +#define CET_NO_TRACK_EN		BIT_ULL(4)
>> +#define CET_SUPPRESS_DISABLE	BIT_ULL(5)
>> +#define CET_RESERVED		(BIT_ULL(6) | BIT_ULL(7) | BIT_ULL(8) | BIT_ULL(9))
>> +#define CET_SUPPRESS		BIT_ULL(10)
>> +#define CET_WAIT_ENDBR		BIT_ULL(11)
>> +
>> +#define MSR_IA32_PL0_SSP	0x6a4 /* kernel shadow stack pointer */
>> +#define MSR_IA32_PL1_SSP	0x6a5 /* ring-1 shadow stack pointer */
>> +#define MSR_IA32_PL2_SSP	0x6a6 /* ring-2 shadow stack pointer */
>> +#define MSR_IA32_PL3_SSP	0x6a7 /* user shadow stack pointer */
>> +#define MSR_IA32_INT_SSP_TAB	0x6a8 /* exception shadow stack table */
>
> When you look at the formatting in that file and the MSR numbers in it, what
> stops you from formatting your addition the same way?
>

Ah, got it.  I will add some leading zeros.  Thanks!

--
Yu-cheng
```