Re: [RFC 00/16] xen/arm: Introduce alternative runtime patching for ARM64

[Julien Grall <julien.grall@arm.com>]

On 05/05/16 17:34, Julien Grall wrote:
> Hello,
> 
> Some of the processor erratum will require to modify code sequence. As those
> modifications may impact the performance, they should only be enabled on
> affected cores. Furthermore, Xen may also want to take advantage of new
> hardware features coming up with v8.1 and v8.2.
> 
> The first part of the series adds the alternative infrastructure, most of the
> code is based on Linux v4.6-rc3. The rest of the series implements errata
> for Cortex-A57 and Cortex-A53.

I forgot to mention that I have pushed a branch with the series on
xenbits:

git://xenbits.xen.org/people/julieng/xen-unstable.git branch alternative-rfc

> Yours sincerely,
> 
> Julien Grall (16):
>    xen/arm: Makefile: Sort the entries alphabetically
>    xen/arm: Include the header asm-arm/system.h in asm-arm/page.h
>    xen/arm: Add macros to handle the MIDR
>    xen/arm: arm64: Import flush_icache_range from Linux v4.6-rc3
>    xen/arm: Add cpu_hwcap bitmap
>    xen/arm64: Add an helper to invalidate all instruction caches
>    xen/arm: arm64: Move the define BRK_BUG_FRAME into a separate header
>    xen/arm: arm64: Reserve a brk immediate to fault on purpose
>    xen/arm: arm64: Add helpers to decode and encode branch instructions
>    xen/arm: Introduce alternative runtime patching
>    xen/arm: Detect silicon revision and set cap bits accordingly
>    xen/arm: Document the errata implemented in Xen
>    xen/arm: arm64: Add Cortex-A53 cache errata workaround
>    xen/arm: arm64: Add cortex-A57 erratum 832075 workaround
>    xen/arm: traps: Don't inject a fault if the translation VA -> IPA
>      fails
>    xen/arm: arm64: Document Cortex-A57 erratum 834220
> 
>   docs/misc/arm/silicon-errata.txt  |  50 +++++++++
>   xen/arch/arm/Kconfig              |  96 +++++++++++++++++
>   xen/arch/arm/Makefile             |  41 +++----
>   xen/arch/arm/alternative.c        | 217 ++++++++++++++++++++++++++++++++++++++
>   xen/arch/arm/arm32/Makefile       |   9 +-
>   xen/arch/arm/arm64/Makefile       |  13 ++-
>   xen/arch/arm/arm64/cache.S        |  51 +++++++++
>   xen/arch/arm/arm64/insn.c         | 213 +++++++++++++++++++++++++++++++++++++
>   xen/arch/arm/cpuerrata.c          |  52 +++++++++
>   xen/arch/arm/cpufeature.c         |  50 +++++++++
>   xen/arch/arm/platforms/Makefile   |   2 +-
>   xen/arch/arm/setup.c              |  11 ++
>   xen/arch/arm/smpboot.c            |   3 +
>   xen/arch/arm/traps.c              |  37 ++++++-
>   xen/arch/arm/xen.lds.S            |   7 ++
>   xen/include/asm-arm/alternative.h | 165 +++++++++++++++++++++++++++++
>   xen/include/asm-arm/arm64/brk.h   |  39 +++++++
>   xen/include/asm-arm/arm64/bug.h   |   5 +-
>   xen/include/asm-arm/arm64/insn.h  |  88 ++++++++++++++++
>   xen/include/asm-arm/arm64/io.h    |  21 +++-
>   xen/include/asm-arm/arm64/page.h  |  13 ++-
>   xen/include/asm-arm/cpuerrata.h   |   6 ++
>   xen/include/asm-arm/cpufeature.h  |  47 +++++++++
>   xen/include/asm-arm/insn.h        |  22 ++++
>   xen/include/asm-arm/page.h        |   3 +
>   xen/include/asm-arm/processor.h   |  43 +++++++-
>   26 files changed, 1260 insertions(+), 44 deletions(-)
>   create mode 100644 docs/misc/arm/silicon-errata.txt
>   create mode 100644 xen/arch/arm/alternative.c
>   create mode 100644 xen/arch/arm/arm64/insn.c
>   create mode 100644 xen/arch/arm/cpuerrata.c
>   create mode 100644 xen/arch/arm/cpufeature.c
>   create mode 100644 xen/include/asm-arm/alternative.h
>   create mode 100644 xen/include/asm-arm/arm64/brk.h
>   create mode 100644 xen/include/asm-arm/arm64/insn.h
>   create mode 100644 xen/include/asm-arm/cpuerrata.h
>   create mode 100644 xen/include/asm-arm/insn.h
> 

-- 
Julien Grall

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