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Date:   Sat, 23 May 2020 04:21:33 +0200
To:     Brendan Shanks <>
Cc:     Thomas Gleixner <>,
        Ingo Molnar <>, Borislav Petkov <>,, "H. Peter Anvin" <>,
        Ricardo Neri <>,
        "Eric W. Biederman" <>,
        Sergey Senozhatsky <>,
        Babu Moger <>,
        Kefeng Wang <>,
        Jason Yan <>,
Subject: Re: umip: AMD Ryzen 3900X, pagefault after emulate SLDT/SIDT

On 11:56 19.05.20, Brendan Shanks wrote:
> The problem is that the kernel does not emulate/spoof the SLDT instruction, only SGDT, SIDT, and SMSW.
> SLDT and STR weren't thought to be commonly used, so emulation/spoofing wasn’t added.
> In the last few months I have seen reports of one or two (32-bit) Windows games that use SLDT though.
> Can you share more information about the application you’re running?

This is basically the "minimal" reproducer for the issue I've been
observed (as by the previously linked article):

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