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

[Wei Chen <wei.chen@xxxxxxx>]

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

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2.25.1