linux-kernel - Re: [RESEND PATCH v2 3/4] x86/umip: Identify the str and sldt instructions

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Date:   Tue, 14 Nov 2017 08:21:57 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...e.de>,
        Andy Lutomirski <luto@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>, x86@...nel.org,
        ricardo.neri@...el.com, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH v2 3/4] x86/umip: Identify the str and sldt
 instructions


* Ricardo Neri <ricardo.neri-calderon@...ux.intel.com> wrote:

> The instructions STR and SLDT are not emulated in any case. Thus, it made
> sense to not implement functionality to identify them. However, a
> subsequent commit will introduce functionality to warn about the use of
> all the instructions that UMIP protect, not only those that are emulated.
> A first step for that is the ability to identify them.
> 
> Plus, now that STR and SLDT are identified, we need to explicitly avoid
> their emulation (i.e., not rely on unsuccessful identification). Group
> togehter all the cases that we do not want to emulate: STR, SLDT and user
> long mode processes.
> 
> Cc: Andy Lutomirski <luto@...nel.org>
> Cc: H. Peter Anvin <hpa@...or.com>
> Cc: Borislav Petkov <bp@...e.de>
> Cc: Tony Luck <tony.luck@...el.com>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Ravi V. Shankar <ravi.v.shankar@...el.com>
> Cc: x86@...nel.org
> Signed-off-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>

Sigh, the _title_ still refers to 'str'...

I'll fix it up, no need to resend, but this lack of attention to details is 
seriously sad.

Thanks,

	Ingo