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Date:   Tue, 19 May 2020 17:17:28 -0700
From:   "H. Peter Anvin" <>
To:     Andreas Rammhold <>,
        Thomas Gleixner <>,
        Ingo Molnar <>, Borislav Petkov <>,,
        Ricardo Neri <>,
        "Eric W. Biederman" <>,
        Sergey Senozhatsky <>,
        Babu Moger <>,
        Kefeng Wang <>,
        Jason Yan <>,
        Brendan Shanks <>,
Subject: Re: umip: AMD Ryzen 3900X, pagefault after emulate SLDT/SIDT

On 2020-05-19 07:38, Andreas Rammhold wrote:
> Hi,
> I've been running into a weird problem with UMIP on a current Ryzen
> 3900x with kernel 5.6.11 where a process receives a page fault after the
> kernel handled the SLDT (or SIDT) instruction (emulation).
> The program I am running is run through WINE in 32bit mode and tries to
> figure out if it is running in a VMWare machine by comparing the results
> of SLDT against well known constants (basically as shown in the
> [example] linked below).

Extremely weird. What is it expecting to happen -- or rather, what do you
*want* it to do?


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