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

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Subject: Re: [PATCH 40/70] x86/sev-es: Setup per-cpu GHCBs for the runtime handler
From: Joerg Roedel <jroedel@xxxxxxx>
Date: Wed, 15 Apr 2020 17:54:28 +0200
Cc: Mike Stunes <mstunes@xxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, "hpa@xxxxxxxxx" <hpa@xxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Thomas Hellstrom <thellstrom@xxxxxxxxxx>, Jiri Slaby <jslaby@xxxxxxx>, Dan Williams <dan.j.williams@xxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "kvm@xxxxxxxxxxxxxxx" <kvm@xxxxxxxxxxxxxxx>, "virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx" <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>
In-reply-to: <09757a84-1d81-74d5-c425-cff241f02ab9@amd.com>
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>
User-agent: Mutt/1.10.1 (2018-07-13)

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

References:
- [RFC PATCH 00/70 v2] x86: SEV-ES Guest Support
  - From: Joerg Roedel
- [PATCH 40/70] x86/sev-es: Setup per-cpu GHCBs for the runtime handler
  - From: Joerg Roedel
- Re: [PATCH 40/70] x86/sev-es: Setup per-cpu GHCBs for the runtime handler
  - From: Mike Stunes
- Re: [PATCH 40/70] x86/sev-es: Setup per-cpu GHCBs for the runtime handler
  - From: Tom Lendacky

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