linux-kernel - Re: [PATCH v2 2/2] x86: paravirt: make native_save

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Date:   Tue, 5 Jun 2018 10:52:42 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     hpa@...or.com
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>, akataria@...are.com,
        boris.ostrovsky@...cle.com, brijesh.singh@....com,
        Cao jin <caoj.fnst@...fujitsu.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        "J. Kiszka" <jan.kiszka@...mens.com>,
        jarkko.sakkinen@...ux.intel.com, jgross@...e.com,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        kirill.shutemov@...ux.intel.com, mingo@...hat.com,
        mjg59@...gle.com, Matthias Kaehlcke <mka@...omium.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        rostedt@...dmis.org, Thomas Gleixner <tglx@...utronix.de>,
        thomas.lendacky@....com, Thiebaud Weksteen <tweek@...gle.com>,
        linux-efi@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        x86@...nel.org, virtualization@...ts.linux-foundation.org,
        Alistair Strachan <astrachan@...gle.com>,
        Manoj Gupta <manojgupta@...gle.com>,
        Greg Hackmann <ghackmann@...gle.com>, sedat.dilek@...il.com,
        tstellar@...hat.com, Kees Cook <keescook@...gle.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        geert@...ux-m68k.org, Will Deacon <will.deacon@....com>,
        mawilcox@...rosoft.com, Arnd Bergmann <arnd@...db.de>,
        David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH v2 2/2] x86: paravirt: make native_save_fl extern inline

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.

?

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?

> 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.
-- 
Thanks,
~Nick Desaulniers