linux-kernel - Re: [Part1 PATCH v7 13/17] x86/io: Unroll string I/O when SEV is active

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Message-ID: <20171020193953.7814f013@alans-desktop>
Date:   Fri, 20 Oct 2017 19:39:53 +0100
From:   Alan Cox <gnomes@...rguk.ukuu.org.uk>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Borislav Petkov <bp@...en8.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...e.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        David Laight <David.Laight@...LAB.COM>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [Part1 PATCH v7 13/17] x86/io: Unroll string I/O when SEV is
 active

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

> From: Tom Lendacky <thomas.lendacky@....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