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Subject: Re: [PATCH v5 22/32] x86, swiotlb: DMA support for memory encryption
References: <20170418211612.10190.82788.stgit@tlendack-t1.amdoffice.net>
 <20170418212010.10190.78119.stgit@tlendack-t1.amdoffice.net>
 <20170516142740.sxfzkvghxubj2okr@pd.tnic>
From: Tom Lendacky <thomas.lendacky@amd.com>
Message-ID: <af97ac86-bfa8-2bd3-f785-fe5cb1b95f8f@amd.com>
Date: Fri, 19 May 2017 14:54:08 -0500
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To: Borislav Petkov <bp@alien8.de>
Cc: linux-arch@vger.kernel.org, linux-efi@vger.kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, x86@kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org, iommu@lists.linux-foundation.org, Rik van Riel <riel@redhat.com>, =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>, Toshimitsu Kani <toshi.kani@hpe.com>, Arnd Bergmann <arnd@arndb.de>, Jonathan Corbet <corbet@lwn.net>, Matt Fleming <matt@codeblueprint.co.uk>, "Michael S.
 Tsirkin" <mst@redhat.com>, Joerg Roedel <joro@8bytes.org>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>, Paolo Bonzini <pbonzini@redhat.com>, Larry Woodman <lwoodman@redhat.com>, Brijesh Singh <brijesh.singh@amd.com>, Ingo Molnar <mingo@redhat.com>, Andy Lutomirski <luto@kernel.org>, "H. Peter
 Anvin" <hpa@zytor.com>, Andrey Ryabinin <aryabinin@virtuozzo.com>, Alexander Potapenko <glider@google.com>, Dave Young <dyoung@redhat.com>, Thomas Gleixner <tglx@linutronix.de>, Dmitry Vyukov <dvyukov@google.com>

On 5/16/2017 9:27 AM, Borislav Petkov wrote:
> On Tue, Apr 18, 2017 at 04:20:10PM -0500, Tom Lendacky wrote:
>> Since DMA addresses will effectively look like 48-bit addresses when the
>> memory encryption mask is set, SWIOTLB is needed if the DMA mask of the
>> device performing the DMA does not support 48-bits. SWIOTLB will be
>> initialized to create decrypted bounce buffers for use by these devices.
>
> Use a verb in the subject:
>
> Subject: x86, swiotlb: Add memory encryption support
>
> or similar.

Will do.

Thanks,
Tom

>

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