linux-kernel - Re: [PATCH -tip v3 1/2] x86: xen: insn: Decode Xen and KVM emulate-prefix signature

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Date:   Fri, 6 Sep 2019 17:51:43 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org
Subject: Re: [PATCH -tip v3 1/2] x86: xen: insn: Decode Xen and KVM
 emulate-prefix signature

On Fri, 6 Sep 2019 17:45:19 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> > 
> > How about we make this asm/virt_prefix.h or something and include:
> > 
> > /*
> >  * Virt escape sequences to trigger instruction emulation;
> >  * ideally these would decode to 'whole' instruction and not destroy
> >  * the instruction stream; sadly this is not true for the 'kvm' one :/
> >  */
> > 
> > #define __XEN_EMULATE_PREFIX  0x0f,0x0b,0x78,0x65,0x6e  /* ud2 ; .ascii "xen" */
> > #define __KVM_EMULATE_PREFIX  0x0f,0x0b,0x6b,0x76,0x6d	/* ud2 ; .ascii "kvm" */

BTW, what should we call it, "emulate prefix" or "virt prefix"?
"virt prefix" sounds too generic to me. So I rather like emulate_prefix.h.

Thank you,
-- 
Masami Hiramatsu <mhiramat@...nel.org>