linux-kernel - Re: [PATCH] x86/umip: Add emulation for 64-bit processes

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Date:   Sun, 8 Sep 2019 09:22:48 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Cc:     Brendan Shanks <bshanks@...eweavers.com>,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] x86/umip: Add emulation for 64-bit processes

On Sat, Sep 07, 2019 at 02:26:10PM -0700, Ricardo Neri wrote:
> > Wine users have encountered a number of 64-bit Windows games that use
> > these instructions (particularly sgdt), and were crashing when run on
> > UMIP-enabled systems.
> 
> Emulation support for 64-bit processes was not initially included
> because no use cases had been identified.

AFAIR, we said at the time that 64-bit doesn't need it because this is
legacy software only and 64-bit will get fixed properly not to use those
insns. I can probably guess how that went ...

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette