Re: [PATCH v3 00/52] xen/arm: Add Armv8-R64 MPU support to Xen - Part#1

[Julien Grall <julien@xxxxxxx>]

Hi Penny,

On 26/06/2023 04:33, Penny Zheng wrote:
> So sorry for the long long wait before v3 serie, since I got sidetracked to
> a new high priority internal project for quite a time.
>
> The Armv8-R architecture profile was designed to support use cases
> that have a high sensitivity to deterministic execution. (e.g.
> Fuel Injection, Brake control, Drive trains, Motor control etc)
>
> Arm announced Armv8-R in 2013, it is the latest generation Arm
> architecture targeted at the Real-time profile. It introduces
> virtualization at the highest security level while retaining the
> Protected Memory System Architecture (PMSA) based on a Memory
> Protection Unit (MPU). In 2020, Arm announced Cortex-R82,
> which is the first Arm 64-bit Cortex-R processor based on Armv8-R64.
> The latest Armv8-R64 document can be found [1]. And the features of
> Armv8-R64 architecture:
>    - An exception model that is compatible with the Armv8-A model
>    - Virtualization with support for guest operating systems
>    - PMSA virtualization using MPUs In EL2.
>    - Adds support for the 64-bit A64 instruction set.
>    - Supports up to 48-bit physical addressing.
>    - Supports three Exception Levels (ELs)
>          - Secure EL2 - The Highest Privilege
>          - Secure EL1 - RichOS (MMU) or RTOS (MPU)
>          - Secure EL0 - Application Workloads
>   - Supports only a single Security state - Secure.
>   - MPU in EL1 & EL2 is configurable, MMU in EL1 is configurable.
>
> These patch series are implementing the Armv8-R64 MPU support
> for Xen, which are based on the discussion of
> "Proposal for Porting Xen to Armv8-R64 - DraftC" [2].
>
> We will implement the Armv8-R64 and MPU support in three stages:
> 1. Support to boot MMU domains on Armv8-R64 Xen.
> 2. Support to boot MPU domains on Armv8-R64 Xen.
> 3. SMP and other advanced features of Xen support on Armv8-R64.
>
> For having a overall undestanding for reviewers about MPU framework on Xen,
> we have introduced a large patch serie here, including 52 commits. At this
> stage, we could successfully boot a linux guest on FVP_BaseR_AEMv8R
> model[3].
>
> We will split these patches to several parts, this series is the
> part#1, v1 is in [4], the full PoC can be found in [5]. More software for
> Armv8-R64 can be found in [6];
>
> [1] https://developer.arm.com/documentation/ddi0600/latest
> [2] https://lists.xenproject.org/archives/html/xen-devel/2022-05/msg00643.html
> [3] 
> https://developer.arm.com/tools-and-software/simulation-models/fixed-virtual-platforms/arm-ecosystem-models
> [4] https://lists.xenproject.org/archives/html/xen-devel/2022-11/msg00289.html
> [5] https://gitlab.com/xen-project/people/weic/xen/-/tree/integration/mpu_v3
The first few patches in this tree seems to be different compare to this 
series. Can you provide a tree with all the patches from this series 
applied?
Cheers,

--
Julien Grall