linux-kernel - RE: [PATCH v3 1/3] rpmb: add Replay Protected Memory Block (RPMB) subsystem

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Message-ID:
 <DM6PR04MB657511E98570A227AD1AF40AFC222@DM6PR04MB6575.namprd04.prod.outlook.com>
Date: Tue, 5 Mar 2024 16:42:26 +0000
From: Avri Altman <Avri.Altman@....com>
To: Arnd Bergmann <arnd@...db.de>, Linus Walleij <linus.walleij@...aro.org>,
	Jens Wiklander <jens.wiklander@...aro.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-mmc
 @ vger . kernel . org" <linux-mmc@...r.kernel.org>,
	"op-tee@...ts.trustedfirmware.org" <op-tee@...ts.trustedfirmware.org>, Shyam
 Saini <shyamsaini@...ux.microsoft.com>, Ulf Hansson <ulf.hansson@...aro.org>,
	Jerome Forissier <jerome.forissier@...aro.org>, Sumit Garg
	<sumit.garg@...aro.org>, Ilias Apalodimas <ilias.apalodimas@...aro.org>, Bart
 Van Assche <bvanassche@....org>, Randy Dunlap <rdunlap@...radead.org>, Ard
 Biesheuvel <ardb@...nel.org>, Greg Kroah-Hartman
	<gregkh@...uxfoundation.org>, Tomas Winkler <tomas.winkler@...el.com>,
	Alex Bennée <alex.bennee@...aro.org>
Subject: RE: [PATCH v3 1/3] rpmb: add Replay Protected Memory Block (RPMB)
 subsystem

 
> On Tue, Mar 5, 2024, at 17:33, Avri Altman wrote:
> >> On Tue, Feb 27, 2024 at 4:31 PM Jens Wiklander
> <jens.wiklander@...aro.org> wrote:
> >>
> >> I would mention in the commit that the subsystem is currently only
> >> used with eMMC but is designed to be used also by UFS and NVME.
> >> Nevertheless, no big deal so:
> > Moreover, as the years went by, the differences between mmc and ufs
> > grew:
> > In mmc there are 7 rpmb operations, in ufs 9.
> > In mmc the rpmb frame is 512Bytes, also in legacy ufs (up to including
> > ufs3.1), but in ufs4.0 onward it can be 4k with extended header.
> > See e.g.
> > https://patchwork.kernel.org/project/linux-scsi/patch/20221107131038.2
> > 01724-3-beanhuo@...pp.de/ In mmc the rpmb sequence is atomic, in ufs
> > not.
> > In ufs rpmb is a wlun in mmc a partition.
> > Both protocols support in multi-region rpmb, but there are some
> > differences there.
> 
> How sure are we then that the user-visible ABI is sufficiently abstract to cover
> all the hardware implementations? Are any of the changes you mention going to
> be noticed by userspace or are they only visible to the kernel driver?
Both in ufs & mmc rpmb today is accessed via user-space utils:
In mmc via mmc-utils (ioctl) , and in ufs via ufs-utils using its bsg interface.
No ABI changes are needed.

Thanks,
Avri

> 
>       Arnd