From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joerg Roedel <jroedel@suse.de>
Subject: Re: [PATCH 40/70] x86/sev-es: Setup per-cpu GHCBs for the runtime
 handler
Date: Wed, 15 Apr 2020 17:54:28 +0200
Message-ID: <20200415155428.GE21899@suse.de>
References: <20200319091407.1481-1-joro@8bytes.org>
 <20200319091407.1481-41-joro@8bytes.org>
 <A7DF63B4-6589-4386-9302-6B7F8BE0D9BA@vmware.com>
 <09757a84-1d81-74d5-c425-cff241f02ab9@amd.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Return-path: <linux-kernel-owner@vger.kernel.org>
Content-Disposition: inline
In-Reply-To: <09757a84-1d81-74d5-c425-cff241f02ab9@amd.com>
Sender: linux-kernel-owner@vger.kernel.org
To: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Mike Stunes <mstunes@vmware.com>, Joerg Roedel <joro@8bytes.org>, "x86@kernel.org" <x86@kernel.org>, "hpa@zytor.com" <hpa@zytor.com>, Andy Lutomirski <luto@kernel.org>, Dave Hansen <dave.hansen@linux.intel.com>, Peter Zijlstra <peterz@infradead.org>, Thomas Hellstrom <thellstrom@vmware.com>, Jiri Slaby <jslaby@suse.cz>, Dan Williams <dan.j.williams@intel.com>, Juergen Gross <jgross@suse.com>, Kees Cook <keescook@chromium.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "kvm@vger.kernel.org" <kvm@vger.kernel.org>, "virtualization@lists.linux-foundation.org" <virtualization@lists.linux-foundation.org>
List-Id: virtualization@lists.linuxfoundation.org

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