From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
Subject: Re: [Part1 PATCH v7 13/17] x86/io: Unroll string I/O when SEV is
 active
Date: Fri, 20 Oct 2017 19:39:53 +0100
Message-ID: <20171020193953.7814f013@alans-desktop>
References: <20171020143059.3291-1-brijesh.singh@amd.com>
        <20171020143059.3291-14-brijesh.singh@amd.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Cc: x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
        Borislav Petkov <bp@alien8.de>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>, Borislav Petkov <bp@suse.de>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        David Laight <David.Laight@ACULAB.COM>,
        Arnd Bergmann <arnd@arndb.de>
To: Brijesh Singh <brijesh.singh@amd.com>
Return-path: <kvm-owner@vger.kernel.org>
Received: from www.llwyncelyn.cymru ([82.70.14.225]:54828 "EHLO fuzix.org"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S1752473AbdJTSkj (ORCPT <rfc822;kvm@vger.kernel.org>);
        Fri, 20 Oct 2017 14:40:39 -0400
In-Reply-To: <20171020143059.3291-14-brijesh.singh@amd.com>
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>

On Fri, 20 Oct 2017 09:30:55 -0500
Brijesh Singh <brijesh.singh@amd.com> wrote:

> From: Tom Lendacky <thomas.lendacky@amd.com>
> 
> Secure Encrypted Virtualization (SEV) does not support string I/O, so
> unroll the string I/O operation into a loop operating on one element at
> a time.

Does this also mean that any firmware running in the virtual machine
(EFI, BIOS, VGA etc) has to be patched and if so shouldn't that be
documented somewhere ?

Alan