linux-kernel - Re: [Part1 PATCH v5 13/17] x86/io: Unroll string I/O when SEV is active

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Message-ID: <20170928175129.djyusxomsntrbdnd@pd.tnic>
Date:   Thu, 28 Sep 2017 19:51:29 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org, x86@...nel.org,
        Tom Lendacky <thomas.lendacky@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        David Laight <David.Laight@...LAB.COM>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [Part1 PATCH v5 13/17] x86/io: Unroll string I/O when SEV is
 active

On Wed, Sep 27, 2017 at 10:13:25AM -0500, Brijesh Singh 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.
> 
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: Borislav Petkov <bp@...e.de>
> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Cc: David Laight <David.Laight@...LAB.COM>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: x86@...nel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
> Signed-off-by: Brijesh Singh <brijesh.singh@....com>
> ---
>  arch/x86/include/asm/io.h | 42 ++++++++++++++++++++++++++++++++++++++----
>  arch/x86/mm/mem_encrypt.c |  8 ++++++++
>  2 files changed, 46 insertions(+), 4 deletions(-)

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--