RE: [PATCH v6 00/11] xen/arm: Add Armv8-R64 MPU support to Xen - Part#1

[Wei Chen <Wei.Chen@xxxxxxx>]

Sorry for the wrong patch version. This is the first version of this series.

Cheers,
Wei Chen

> -----Original Message-----
> From: Wei Chen <wei.chen@xxxxxxx>
> Sent: 2022年11月4日 18:08
> To: xen-devel@xxxxxxxxxxxxxxxxxxxx
> Cc: nd <nd@xxxxxxx>; Wei Chen <Wei.Chen@xxxxxxx>; Stefano Stabellini
> <sstabellini@xxxxxxxxxx>; Julien Grall <julien@xxxxxxx>; Bertrand Marquis
> <Bertrand.Marquis@xxxxxxx>; Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
> Subject: [PATCH v6 00/11] xen/arm: Add Armv8-R64 MPU support to Xen -
> Part#1
> 
> The Armv-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" [1].
> 
> We will implement the Armv8-R64 and MPU support in three stages:
> 1. Boot Xen itself to idle thread, do not create any guests on it.
> 2. Support to boot MPU and MMU domains on Armv8-R64 Xen.
> 3. SMP and other advanced features of Xen support on Armv8-R64.
> 
> We will split these patches to several parts, this series is the
> part#1, the full PoC can be found in [3]. More software for
> Armv8-R64 can be found in [4];
> 
> [1] https://developer.arm.com/documentation/ddi0600/latest
> [2] https://lists.xenproject.org/archives/html/xen-devel/2022-
> 05/msg00643.html
> [3] https://gitlab.com/xen-project/people/bmarquis/xen-arm-poc/-
> /tree/poc/r82-mpu-v2
> [4] https://armv8r64-refstack.docs.arm.com/en/v4.0/
> 
> Penny Zheng (3):
>   xen/arm64: create boot-time MPU protection regions
>   xen/arm64: introduce helpers for MPU enable/disable
>   xen/arm64: add setup_fixmap and remove_identity_mapping for MPU
> 
> Wei Chen (8):
>   xen/arm: remove xen_phys_start and xenheap_phys_end from config.h
>   xen/arm: add iounmap after initrd has been loaded in domain_build
>   xen/arm: disable EFI boot services for MPU systems
>   xen/arm: adjust Xen TLB helpers for Armv8-R64 PMSA
>   xen/arm: define Xen start address for FVP BaseR platform
>   xen/arm: split MMU and MPU config files from config.h
>   xen/arm: implement FIXMAP_ADDR for MPU systems
>   xen/arm64: move MMU related code from head.S to head_mmu.S
> 
>  xen/arch/arm/Kconfig                          |  15 +-
>  xen/arch/arm/arm64/Makefile                   |   5 +
>  xen/arch/arm/arm64/head.S                     | 429 ++----------------
>  xen/arch/arm/arm64/head_mmu.S                 | 364 +++++++++++++++
>  xen/arch/arm/arm64/head_mpu.S                 | 154 +++++++
>  xen/arch/arm/domain_build.c                   |   2 +
>  xen/arch/arm/include/asm/arm64/flushtlb.h     |  25 +
>  xen/arch/arm/include/asm/arm64/macros.h       |  52 ++-
>  xen/arch/arm/include/asm/arm64/mpu.h          |  13 +
>  xen/arch/arm/include/asm/arm64/sysregs.h      |  89 ++++
>  xen/arch/arm/include/asm/config.h             |  99 +---
>  xen/arch/arm/include/asm/config_mmu.h         | 119 +++++
>  xen/arch/arm/include/asm/config_mpu.h         |  29 ++
>  xen/arch/arm/include/asm/fixmap.h             |  25 +
>  xen/arch/arm/include/asm/flushtlb.h           |  22 +
>  .../arm/include/asm/platforms/fvp_baser.h     |  18 +
>  xen/arch/arm/platforms/Kconfig                |  16 +-
>  17 files changed, 976 insertions(+), 500 deletions(-)
>  create mode 100644 xen/arch/arm/arm64/head_mmu.S
>  create mode 100644 xen/arch/arm/arm64/head_mpu.S
>  create mode 100644 xen/arch/arm/include/asm/arm64/mpu.h
>  create mode 100644 xen/arch/arm/include/asm/config_mmu.h
>  create mode 100644 xen/arch/arm/include/asm/config_mpu.h
>  create mode 100644 xen/arch/arm/include/asm/platforms/fvp_baser.h
> 
> --
> 2.25.1