linux-kernel - Re: [RFC PATCH] x86/insn: support decode MOVSXD instruction for MMIO

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Date:   Fri, 31 Mar 2023 10:24:14 +0800
From:   Wu Zongyong <wuzongyong@...ux.alibaba.com>
To:     kirill.shutemov@...ux.intel.com
Cc:     tglx@...utronix.de, mingo@...hat.com, dave.hansen@...ux.intel.com,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        thomas.lendacky@....com, tony.luck@...el.com,
        wutu.xq2@...ux.alibaba.com
Subject: Re: [RFC PATCH] x86/insn: support decode MOVSXD instruction for MMIO

On Thu, Mar 30, 2023 at 03:39:51PM +0300, kirill.shutemov@...ux.intel.com wrote:
> On Wed, Mar 29, 2023 at 10:59:37AM +0800, Wu Zongyong wrote:
> > It seems MOVSXD which opcode is 0x63 is not handled, support
> > to decode it in insn_decode_mmio().
> 
> Do you have a particular user in mind?
To be honest, I don't find a specific user which uses the MOVSXD.

But both Intel and AMD's instructions reference contains MOVSXD and lots
of MOVSXD instructions occur when I "objdump -S vmlinux", so I think it
may be useful to support it in insn_decode_mmio().

Are there some special consideration about this instruction?

> 
> -- 
>   Kiryl Shutsemau / Kirill A. Shutemov