linux-kernel - Re: [PATCH v5 00/75] x86: SEV-ES Guest Support

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Message-ID: <84EC8E16-5ACD-421D-9B3A-1C80985A1A0B@vmware.com>
Date:   Fri, 21 Aug 2020 17:42:16 +0000
From:   Mike Stunes <mstunes@...are.com>
To:     Joerg Roedel <joro@...tes.org>
CC:     "x86@...nel.org" <x86@...nel.org>, Joerg Roedel <jroedel@...e.de>,
        "hpa@...or.com" <hpa@...or.com>, Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Slaby <jslaby@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Juergen Gross <jgross@...e.com>,
        Kees Cook <keescook@...omium.org>,
        David Rientjes <rientjes@...gle.com>,
        Cfir Cohen <cfir@...gle.com>,
        Erdem Aktas <erdemaktas@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Martin Radev <martin.b.radev@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH v5 00/75] x86: SEV-ES Guest Support

Hi Joerg,

> On Aug 21, 2020, at 1:05 AM, Joerg Roedel <joro@...tes.org> wrote:
> 
> Tom and a few others debugged another FSGSBASE issue yesterday, which I
> think might also be the cause for the AP startup problems you are
> seeing (if you test on Rome).
> 
> Can you try to disable support for RDPID in the guest, but keep fsgsbase
> enabled?

Yes, that fixes the problem — I can see both CPUs running now. Thanks!

Mike