Re: [kvm-unit-tests PATCH v2 3/9] s390x: gs: move to new header file

Janosch Frank
2022-03-25T07:29:24Z

On 3/24/22 18:40, Heiko Carstens wrote:
> On Wed, Mar 23, 2022 at 06:03:19PM +0100, Nico Boehr wrote:
> ...
>> +static inline unsigned long load_guarded(unsigned long *p)
>> +{
>> + unsigned long v;
>> +
>> + asm(".insn rxy,0xe3000000004c, %0,%1"
>> + : "=d" (v)
>> + : "m" (*p)
>> + : "r14", "memory");
>> + return v;
>> +}
>
> It was like that before, but why is r14 within the clobber list?
> That doesn't make sense.

r14 is changed in the gs handler of the gs test which is executed if the
"guarded" part of the load takes place.