linux-kernel - Re: umip: AMD Ryzen 3900X, pagefault after emulate SLDT/SIDT instruction

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Date:   Sat, 23 May 2020 04:17:39 +0200
From:   Andreas Rammhold <andi@...much.email>
To:     Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Cc:     Brendan Shanks <bshanks@...eweavers.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Babu Moger <Babu.Moger@....com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Jason Yan <yanaijie@...wei.com>, linux-kernel@...r.kernel.org
Subject: Re: umip: AMD Ryzen 3900X, pagefault after emulate SLDT/SIDT
 instruction

On 12:43 19.05.20, Ricardo Neri wrote:
> I have a patch for this already that I wrote for testing purposes:
> https://github.com/ricardon/tip/commit/1692889cb3f8accb523d44b682458e234b93be50
> Perhaps it can be used as a starting point? Not sure what the spoofing
> value should be, though. Perhaps 0?

I tried the above patch (in modified/rebased version; hope that didn't
kill it [0]). The results are negative, as without the patch.

[0] https://github.com/andir/linux/commit/bda858f44a860762bc484da62833f57462220874