linux-kernel - Re: [PATCH 40/70] x86/sev-es: Setup per-cpu GHCBs for the runtime handler

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Date:   Wed, 15 Apr 2020 17:54:28 +0200
From:   Joerg Roedel <jroedel@...e.de>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     Mike Stunes <mstunes@...are.com>, Joerg Roedel <joro@...tes.org>,
        "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Hellstrom <thellstrom@...are.com>,
        Jiri Slaby <jslaby@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Juergen Gross <jgross@...e.com>,
        Kees Cook <keescook@...omium.org>,
        "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 40/70] x86/sev-es: Setup per-cpu GHCBs for the runtime
 handler

On Tue, Apr 14, 2020 at 03:04:42PM -0500, Tom Lendacky wrote:
> At that point the guest won't be able to communicate with the hypervisor,
> too. Maybe we should BUG() here to terminate further processing?

We could talk to the hypervisor, there is still the boot-GHCB in the
bss-decrypted section. But there is nothing that could be done here
anyway besides terminating the guest.


Regards,

	Joerg