From: Brijesh Singh <brijesh.singh@amd.com>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: <brijesh.singh@amd.com>, <thomas.lendacky@amd.com>,
<herbert@gondor.apana.org.au>, <arnd@arndb.de>,
<lambert.quentin@gmail.com>, <gary.hook@amd.com>,
<linux-kernel@vger.kernel.org>, <Julia.Lawall@lip6.fr>,
<weiyongjun1@huawei.com>, <linux-crypto@vger.kernel.org>,
<umgwanakikbuti@gmail.com>
Subject: Re: [PATCH 0/2] Introduce AMD Secure Processor device
Date: Fri, 20 Jan 2017 09:40:49 -0600 [thread overview]
Message-ID: <129bc948-6836-bf0f-832e-525f0805c549@amd.com> (raw)
In-Reply-To: <20170120084530.GA25333@kroah.com>
On 01/20/2017 02:45 AM, Greg KH wrote:
> On Thu, Jan 19, 2017 at 02:03:12PM -0600, Brijesh Singh wrote:
>> Hi Greg,
>>
>> On 01/19/2017 12:21 PM, Greg KH wrote:
>>> On Thu, Jan 19, 2017 at 01:07:50PM -0500, Brijesh Singh wrote:
>>>> The CCP device (drivers/crypto/ccp/ccp.ko) is part of AMD Secure Processor,
>>>> which is not dedicated solely to crypto. The AMD Secure Processor includes
>>>> CCP and PSP (Platform Secure Processor) devices.
>>>>
>>>> This patch series moves the CCP device driver to the misc directory and
>>>> creates a framework that allows functional component of the AMD Secure
>>>> Processor to be initialized and handled appropriately.
>>>
>>> Why the misc directory? I don't see the justification here...
>>>
>>
>> Since this driver is not solely for crypto purposes and do not fit in any of
>> the standard categories hence I thought of moving it into misc directory. I
>> am open to other suggestions unless Herbert is ok with leaving it into
>> crypto and allowing the addition of the Secure Processor support.
>>
>> The patch series allows the CCP driver to support other Secure Processor
>> functions, e.g Secure Encrypted Virtualization (SEV) key management. In
>> past, I tried to add SEV support into existing CCP driver [1] but we quickly
>> learned that CCP driver should be moved outside the crypto directory
>> otherwise will end up adding non crypto code into drivers/crypto directory.
>> Once this cleanup is accepted then I can work to add SEV support inside the
>> CCP driver.
>>
>> [1] http://marc.info/?l=linux-kernel&m=147204118426151&w=2
>
> Ok, what type of interface will this driver have with userspace and/or
> other parts of the kernel? Is there a misc char device burried in there
> somewhere (I couldn't find it in the big diff sent out), or is this
> driver just creating specific apis that other parts of the kernel will
> call if available?
>
Eventually, the driver will export functions which will be used by KVM
to encrypt the guest memory and more. Additionally, If SEV device is
detected then driver will create a misc char device which can be used by
userspace to import/export certificates etc.
I do realize that we need to get some more context on why this
refactoring is needed and how it will benefit the SEV device
integration. I will drop this patch for now, will include it as part of
next SEV RFC patch series (which provides the complete context with
examples).
thanks,
~ Brijesh
> I think we need to see more code here, broken up into sane and
> reviewable pieces, before we could either say "No don't do that!" or
> "sure, let me go merge these!" :)
>
> thanks,
>
> greg k-h
>
next prev parent reply other threads:[~2017-01-20 15:40 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-19 18:07 [PATCH 0/2] Introduce AMD Secure Processor device Brijesh Singh
2017-01-19 18:08 ` [PATCH 1/2] crypto: move CCP device driver to misc Brijesh Singh
2017-01-19 18:18 ` Greg KH
2017-01-19 19:10 ` Brijesh Singh
2017-01-20 16:33 ` kbuild test robot
2017-01-19 18:08 ` [PATCH 2/2] misc: amd-sp: introduce the AMD Secure Processor device Brijesh Singh
2017-01-19 18:22 ` Greg KH
2017-01-20 16:20 ` kbuild test robot
2017-01-20 19:51 ` kbuild test robot
2017-01-19 18:21 ` [PATCH 0/2] Introduce " Greg KH
2017-01-19 20:03 ` Brijesh Singh
2017-01-20 8:45 ` Greg KH
2017-01-20 15:40 ` Brijesh Singh [this message]
2017-01-20 17:39 ` Greg KH
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