Re: [PATCH v7 24/36] x86, swiotlb: Add memory encryption support

From	Borislav Petkov <bp@alien8.de>
Newsgroups	linux.kernel
Subject	Re: [PATCH v7 24/36] x86, swiotlb: Add memory encryption support
Date	2017-06-21 12:00 +0200
Message-ID	<tUKAy-4rR-7@gated-at.bofh.it> (permalink)
References	<tTjsJ-5VA-5@gated-at.bofh.it> <tUKAy-4rR-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Fri, Jun 16, 2017 at 01:54:24PM -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.
> 
> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
> ---
>  arch/x86/include/asm/dma-mapping.h |    5 ++-
>  arch/x86/include/asm/mem_encrypt.h |    5 +++
>  arch/x86/kernel/pci-dma.c          |   11 +++++--
>  arch/x86/kernel/pci-nommu.c        |    2 +
>  arch/x86/kernel/pci-swiotlb.c      |   15 +++++++++-
>  arch/x86/mm/mem_encrypt.c          |   22 +++++++++++++++
>  include/linux/swiotlb.h            |    1 +
>  init/main.c                        |   10 +++++++
>  lib/swiotlb.c                      |   54 +++++++++++++++++++++++++++++++-----
>  9 files changed, 108 insertions(+), 17 deletions(-)

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

-- 
Regards/Gruss,
    Boris.

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Re: [PATCH v7 24/36] x86, swiotlb: Add memory encryption support Borislav Petkov <bp@alien8.de> - 2017-06-21 12:00 +0200

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