From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Subject: Re: [v6 PATCH 12/21] x86/insn: Support both signed 32-bit and
 64-bit effective addresses
Date: Thu, 11 May 2017 18:55:54 -0700
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To: Borislav Petkov <bp@suse.de>
Cc: Ingo Molnar <mingo@redhat.com>, Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>, Andy Lutomirski <luto@kernel.org>, Peter Zijlstra <peterz@infradead.org>, Andrew Morton <akpm@linux-foundation.org>, Brian Gerst <brgerst@gmail.com>, Chris Metcalf <cmetcalf@mellanox.com>, Dave Hansen <dave.hansen@linux.intel.com>, Paolo Bonzini <pbonzini@redhat.com>, Masami Hiramatsu <mhiramat@kernel.org>, Huang Rui <ray.huang@amd.com>, Jiri Slaby <jslaby@suse.cz>, Jonathan Corbet <corbet@lwn.net>, "Michael S. Tsirkin" <mst@redhat.com>, Paul Gortmaker <paul.gortmaker@windriver.com>, Vlastimil Babka <vbabka@suse.cz>, Chen Yucong <slaoub@gmail.com>, Alexandre Julliard <julliard@winehq.org>, Stas Sergeev <stsp@list.ru>, Fenghua Yu <fenghua.yu>

On Mon, 2017-05-08 at 13:42 +0200, Borislav Petkov wrote:
> On Wed, Apr 26, 2017 at 08:33:46PM -0700, Ricardo Neri wrote:
> > This is the reason I check the value of long_bytes. If long_bytes is not
> > 4, being the only other possible value 8 (perhaps I need to issue an
> > error when the value is not any of these values),
> 
> Well, maybe I'm a bit too paranoid. Bottom line is, we should do the
> address computations exactly like the hardware does them so that there
> are no surprises. Doing them with longs looks ok to me.

Using long is exactly what I intend to do. The problem that I am trying
to resolve is to sign-extend signed memory offsets of 32-bit programs
running on 64-bit kernels. For 64-bit programs running on 64-bit kernels
I can simply use longs. I added error checking in my v7 of this series
[1].

Thanks and BR,
Ricardo

[1]. https://lkml.org/lkml/2017/5/5/407