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
