linux-kernel - Re: [PATCH v7] misc: Add Nitro Secure Module driver

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Message-ID: <363ca575-f01a-4d09-ae9d-b6249b3aedb3@amazon.com>
Date: Mon, 25 Dec 2023 17:07:29 +0100
From: Alexander Graf <graf@...zon.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
CC: <linux-kernel@...r.kernel.org>, <linux-crypto@...r.kernel.org>, "Arnd
 Bergmann" <arnd@...db.de>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Herbert Xu <herbert@...dor.apana.org.au>, Olivia Mackall
	<olivia@...enic.com>, Petre Eftime <petre.eftime@...il.com>, Erdem Meydanlli
	<meydanli@...zon.nl>, Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	David Woodhouse <dwmw@...zon.co.uk>, Jason Wang <jasowang@...hat.com>, "Xuan
 Zhuo" <xuanzhuo@...ux.alibaba.com>, Christophe JAILLET
	<christophe.jaillet@...adoo.fr>
Subject: Re: [PATCH v7] misc: Add Nitro Secure Module driver

Hey Michael,

On 25.12.23 15:06, Michael S. Tsirkin wrote:
> On Wed, Oct 11, 2023 at 09:35:22PM +0000, Alexander Graf wrote:
>> When running Linux inside a Nitro Enclave, the hypervisor provides a
>> special virtio device called "Nitro Security Module" (NSM). This device
>> has 3 main functions:
>>
>>    1) Provide attestation reports
>>    2) Modify PCR state
>>    3) Provide entropy
>>
>> This patch adds a driver for NSM that exposes a /dev/nsm device node which
>> user space can issue an ioctl on this device with raw NSM CBOR formatted
>> commands to request attestation documents, influence PCR states, read
>> entropy and enumerate status of the device. In addition, the driver
>> implements a hwrng backend.
>>
>> Originally-by: Petre Eftime <petre.eftime@...il.com>
>> Signed-off-by: Alexander Graf <graf@...zon.com>
> Alex are you going to publish the spec patch for this device?  Important
> so we don't need to guess at behaviour when e.g.  making changes to
> virtio APIs.  Also, which tree do you want this to go through?


The spec patch including ping mail are sitting on the virtio-comments 
mailing list since October. I haven't seen any reply unfortunately :(

https://lore.kernel.org/virtio-comment/20231025235345.17788-1-graf@amazon.com/

Happy to read feedback if you have any :).

This patch here is already applied in Greg's misc tree which I'm happy 
to have it trickle to Linus through.


Alex




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