Re: [PATCH v2 01/23] x86/fpu: Extend fpu_xstate_prctl() with guest permissions

[Thomas Gleixner <tglx@xxxxxxxxxxxxx>]

On Fri, Dec 17 2021 at 19:45, Thomas Gleixner wrote:

> On Fri, Dec 17 2021 at 07:29, Jing Liu wrote:
>>  
>> -static int __xstate_request_perm(u64 permitted, u64 requested)
>> +static int __xstate_request_perm(u64 permitted, u64 requested, bool guest)
>>  {
>>  	/*
>>  	 * This deliberately does not exclude !XSAVES as we still might
>> @@ -1605,6 +1605,7 @@ static int __xstate_request_perm(u64 permitted, u64 requested)
>>  	 */
>>  	bool compacted = cpu_feature_enabled(X86_FEATURE_XSAVES);
>>  	struct fpu *fpu = &current->group_leader->thread.fpu;
>> +	struct fpu_state_perm *perm;
>>  	unsigned int ksize, usize;
>>  	u64 mask;
>>  	int ret;
>
> needs to be
>
>       int ret = 0;
>

Alternatively return 0 at the end of the function.