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

Masami Hiramatsu
2019-09-06T08:51:50Z

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