linux-kernel - Re: [PATCH v6 00/76] x86: SEV-ES Guest Support

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Message-ID: <D0B35ACA-7220-45DD-B524-0AFD6BE7BA3D@vmware.com>
Date:   Tue, 25 Aug 2020 00:21:03 +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 v6 00/76] x86: SEV-ES Guest Support

Hi Joerg,

> On Aug 24, 2020, at 1:53 AM, Joerg Roedel <joro@...tes.org> wrote:
> 
> From: Joerg Roedel <jroedel@...e.de>
> 
> Hi,
> 
> here is the new version of the SEV-ES client enabling patch-set. It is
> based on the latest tip/master branch and contains the necessary
> changes. In particular those ar:
> 
> 	- Enabling CR4.FSGSBASE early on supported processors so that
> 	  early #VC exceptions on APs can be handled.

Thanks for the new update! I still see the same FSGSBASE behavior on our platform.

That is, APs come up offline; masking out either FSGSBASE or RDPID from the
guest's CPUID results in all CPUs online.

Is that still expected with this patch set? (As you mentioned in an earlier reply,
I’m testing on a Rome system.)

Thanks!
Mike