linux-kernel - Re: [patch] x86/realmode: Make stack lock work in trampoline

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Date:   Sat, 10 Jun 2023 23:51:21 +0100
From:   'Andrew Cooper' <andrew.cooper3@...rix.com>
To:     David Laight <David.Laight@...LAB.COM>,
        Yunhong Jiang <yunhong.jiang@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     "Kirill A. Shutemov" <kirill@...temov.name>,
        LKML <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Gerst <brgerst@...il.com>,
        Arjan van de Veen <arjan@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Paul McKenney <paulmck@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Sean Christopherson <seanjc@...gle.com>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        Paul Menzel <pmenzel@...gen.mpg.de>,
        "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
        Piotr Gorski <lucjan.lucjanov@...il.com>,
        Usama Arif <usama.arif@...edance.com>,
        Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
        Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Guo Ren <guoren@...nel.org>,
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        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
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        Helge Deller <deller@....de>,
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        Sabin Rapan <sabrapan@...zon.com>,
        "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [patch] x86/realmode: Make stack lock work in trampoline_compat()

On 10/06/2023 8:50 pm, David Laight wrote:
> From: Andrew Cooper
>> Sent: 09 June 2023 00:58
>>
> ...
>> The important point is the l suffix on btsl, which forces it to be long
>> (32bit) irrespective of the default operand size.
> Does that matter at all?

Yes, or I wouldn't have wasted everyone's time saying otherwise.

I recommend educating yourself with the instruction manual, rather than
presenting a set of statements which are all wrong.

~Andrew