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From: Ladvine D Almeida <>
To: Christoph Hellwig <>,
	Ladvine D Almeida <>
Cc: Milan Broz <>,
	Alasdair Kergon <>,
	"Mike Snitzer" <>,
	"" <>,
	Manjunath M Bettegowda <>,
	Prabu Thangamuthu <>,
	Tejas Joglekar <>,
	device-mapper development <>,
	Joao Pinto <>,
	"" <>,
	"" <>,
	"" <>,
	"" <>
Subject: Re: [PATCH] md: dm-crypt: Add Inline Encryption support for dmcrypt
Date: Wed, 6 Jun 2018 10:04:14 +0000	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Friday 01 June 2018 09:16 AM, Christoph Hellwig wrote:
> On Wed, May 30, 2018 at 02:52:07PM +0000, Ladvine D Almeida wrote:
>> when the optional argument "perform_inline_encrypt" is set, we are not unconditionally sending the bio
>> to the block devices. The steps are explained below:
>> 1. user invokes the dm-setup command with the registered cipher "xts" and with the optional argument
>> "perform_inline_encrypt".
>> 2. dm-setup invokes the setkey function of the newly introduced algorithm, which finds the available key slots
>> to be programmed(UFS Host controller Inline Encryption engine has multiple keyslots), program the key slot,
>> and return the key slot index as return value of the set key function.
>> 3. When read/write operation happens, crypt_map() function in dm-crypt validates whether there is associated
>> key configuration index for the request. The Bio will be submitted directly in this case only with the associated
>> crypto context.
>> 4. Block device driver, eg. UFS host controller driver will create the Transfer requests as per this crypto context and
>> encryption happens inside the controller.
> Why isn't this all controlled by the ufs drivers, using helpers as
> required?

The idea is to make use of the existing utilities like dmsetup to configure the keys, mapping etc.

> Also why do we even need this API over just implementing TCG
> Opal/Opalite on the device?
TCG Opal/Opalite is FDE solution. right?

File Based Encryption is accomplished in the ext4/f2fs layer by invoking the registered algorithms from LKCF.

There is a scope for FBE, if the implementation is crypto API.



  reply	other threads:[~2018-06-06 10:04 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-28 13:01 Ladvine D Almeida
2018-05-28 16:32 ` Milan Broz
2018-05-30 14:52   ` Ladvine D Almeida
2018-06-01  7:52     ` Milan Broz
2018-06-01  8:16     ` Christoph Hellwig
2018-06-06 10:04       ` Ladvine D Almeida [this message]
2018-06-06 13:15         ` Christoph Hellwig
2018-06-01 14:46     ` [dm-devel] " Eric Biggers
2018-06-04 13:15       ` Ladvine D Almeida

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