Linux Virtualization - Jun 2018 - [PATCH v2 2/2] x86: paravirt: make native_save_fl extern inline

On 06/05/18 10:05, Nick Desaulniers wrote:
> +
> +/*
> + * void native_restore_fl(unsigned long flags)
> + * %rdi: flags
> + */
> +ENTRY(native_restore_fl)
> +	push %_ASM_DI
> +	popf
> +	ret
> +ENDPROC(native_restore_fl)
> +EXPORT_SYMBOL(native_restore_fl)
> 
To work on i386, this would have to be %_ASM_AX in that case.

Something like this added to <asm/asm.h> might be useful; then you can
simply:

	push %_ASM_ARG1
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On 06/05/18 10:28, H. Peter Anvin wrote:
> On 06/05/18 10:05, Nick Desaulniers wrote:
>> +
>> +/*
>> + * void native_restore_fl(unsigned long flags)
>> + * %rdi: flags
>> + */
>> +ENTRY(native_restore_fl)
>> +	push %_ASM_DI
>> +	popf
>> +	ret
>> +ENDPROC(native_restore_fl)
>> +EXPORT_SYMBOL(native_restore_fl)
>>
> 
> To work on i386, this would have to be %_ASM_AX in that case.
> 
> Something like this added to <asm/asm.h> might be useful; then you
can
> simply:
> 
> 	push %_ASM_ARG1
> 
Version with fixed typo...

	-hpa

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On 06/05/18 10:52, Nick Desaulniers wrote:
> 
> Does the kernel have a different calling convention for 32b x86? How
> does that work? regparm=3? Does that need to be added to the
> declaration?
> 
Yes, -mregparm=3.  No, doesn't need to be added to the declaration.

>> Something like this added to <asm/asm.h> might be useful; then
you can
>> simply:
>>
>>       push %_ASM_ARG1
>>
>> Version with fixed typo...
> 
> Oh, nice, thanks! I'll pick this up and add it to my patch set for v3
> (or did you want me to review/sign-off now?) I can pick up Sedat's
> suggestion.
> 
Add it to your patchset and add your own signoff underneath mine.

	-hpa