RE: [virtio-comment] RE: [virtio-dev] Re: [virtio-comment] [PATCH] Add virtio rpmb device specification

["Huang, Yang" <yang.huang@intel.com>]

> -----Original Message-----
> From: Michael S. Tsirkin [mailto:mst@redhat.com]
> Sent: Sunday, August 4, 2019 15:49
> To: Huang, Yang <yang.huang@intel.com>
> Cc: Paolo Bonzini <pbonzini@redhat.com>; virtio-dev@lists.oasis-open.org;
> virtio-comment@lists.oasis-open.org; Zhu, Bing <bing.zhu@intel.com>; Winkler,
> Tomas <tomas.winkler@intel.com>
> Subject: Re: [virtio-comment] RE: [virtio-dev] Re: [virtio-comment] [PATCH] Add
> virtio rpmb device specification
> 
> On Sun, Aug 04, 2019 at 02:07:49AM +0000, Huang, Yang wrote:
> >
> >
> > > -----Original Message-----
> > > From: virtio-dev@lists.oasis-open.org
> > > [mailto:virtio-dev@lists.oasis-open.org]
> > > On Behalf Of Michael S. Tsirkin
> > > Sent: Sunday, August 4, 2019 5:00
> > > To: Huang, Yang <yang.huang@intel.com>
> > > Cc: Paolo Bonzini <pbonzini@redhat.com>;
> > > virtio-dev@lists.oasis-open.org;
> > > virtio-comment@lists.oasis-open.org; Zhu, Bing <bing.zhu@intel.com>;
> > > Winkler, Tomas <tomas.winkler@intel.com>
> > > Subject: [virtio-dev] Re: [virtio-comment] [PATCH] Add virtio rpmb
> > > device specification
> > >
> > > On Tue, Jul 30, 2019 at 12:33:17AM +0000, Huang, Yang wrote:
> > > >
> > > >
> > > > > -----Original Message-----
> > > > > From: virtio-comment@lists.oasis-open.org
> > > > > [mailto:virtio-comment@lists.oasis-
> > > > > open.org] On Behalf Of Paolo Bonzini
> > > > > Sent: Monday, July 29, 2019 17:19
> > > > > To: Huang, Yang <yang.huang@intel.com>;
> > > > > virtio-dev@lists.oasis-open.org
> > > > > Cc: virtio-comment@lists.oasis-open.org; mst@redhat.com; Zhu,
> > > > > Bing <bing.zhu@intel.com>; Winkler, Tomas
> > > > > <tomas.winkler@intel.com>
> > > > > Subject: Re: [virtio-comment] [PATCH] Add virtio rpmb device
> > > > > specification
> > > > >
> > > > > On 29/07/19 09:48, Huang Yang wrote:
> > > > > >
> > > > > > But virtualization software like Qemu doesn't provide
> > > > > > eMMC/UFS/NVMe RPMB emulation. It blocks the OS like Trusty or
> > > > > > OP-TEE running in a virtualization environment. For instance,
> > > > > > Google right now uses another way to work around RPMB
> > > > > > emulation issue when running Trusty in
> > > > > ARM Qemu:
> > > > > > https://android.googlesource.com/trusty/external/trusty/+/refs
> > > > > > /hea
> > > > > > ds/m
> > > > > > aster/test-runner/
> > > > > >
> > > > > > Virtio RPMB standardization will definitely benefit OP-TEE,
> > > > > > Google Trusty TEE, Qemu, OVMF or other modules to develop the
> > > > > > RPMB based secure storage in virtualization.
> > > > > >
> > > > >
> > > > > Is there any reason to use a new virtio-blk device, and not add
> > > > > this functionality to virtio-blk?
> > > > >
> > > > > Paolo
> > > >
> > > > RPMB does not behave as a blk device. It doesn't have block device APIs.
> > > > Current virtio blk features or definitions in spec are mostly
> > > > useless or
> > > inapplicable to virtio rpmb.
> > > > It performs a different behaviors from the operations on a blk device.
> > > > Key, writer counter or nonce are required to read/write on it.
> > > > If add it to blk device, it will not only cause to a higher
> > > > complexity, but also
> > > cause to two different behaviors on a same device.
> > > >
> > >
> > >
> > > Well it seems that current RPMB implementations are all tied to a
> > > storage device, like MMC or NVMe. Why is that and why doesn't the same
> logic apply here?
> > >
> > > --
> > > MST
> > >
> >
> > RPMB is a mandatory hardware partition of eMMC, UFS and optional for
> NVMe.
> > It is standardized by JEDEC and NVMe.
> > This partition is different from the user data partition that blk device emulates.
> > It provides a signed access in an authenticated and replay protected
> > manner that blk device does not perform. Only RPMB key owner can write
> > to it while anybody can access to a user data partition.
> 
> Sorry if I'm being dense, so how is this different from e.g. NVMe?
> 
> --
> MST

Do you refer to the difference between NVMe RPMB and eMMC RPMB?
Or between NVMe RPMB partition and NVMe user data partition?