[SRU] [PULL] [Cosmic] powerpc: support software count cache flush

[Andrea Righi]

BugLink: https://bugs.launchpad.net/bugs/1822870

This is the backport of the count cache flush by software on
context-switch capability for powerpc (Spectre v2 mitigation).

All clean cherry picks, except few minor adjustments to apply some
patches, but no significant backport changes.

The following changes since commit 2e8c30c50b1881a4f29c65f595c4a1b87b435d35:

  UBUNTU: Ubuntu-4.18.0-18.19 (2019-04-02 18:06:12 +0200)

are available in the Git repository at:

  git://git.launchpad.net/~arighi/+git/cosmic-linux powerpc-count-cache-flush-spectre-v2

for you to fetch changes up to 31061ccf5a54f899aa1e7478a050cf6cfc0c1495:

  powerpc/64: Make stf barrier PPC_BOOK3S_64 specific. (2019-04-08 18:31:48 +0200)

----------------------------------------------------------------
Diana Craciun (7):
      powerpc/64: Disable the speculation barrier from the command line
      powerpc/64: Make meltdown reporting Book3S 64 specific
      powerpc/fsl: Add barrier_nospec implementation for NXP PowerPC Book3E
      powerpc/fsl: Add infrastructure to fixup branch predictor flush
      powerpc/fsl: Add nospectre_v2 command line argument
      powerpc/fsl: Update Spectre v2 reporting
      powerpc/64: Make stf barrier PPC_BOOK3S_64 specific.

Michael Ellerman (7):
      powerpc/asm: Add a patch_site macro & helpers for patching instructions
      powerpc/64s: Add new security feature flags for count cache flush
      powerpc/64s: Add support for software count cache flush
      powerpc/64: Add CONFIG_PPC_BARRIER_NOSPEC
      powerpc/security: Fix spectre_v2 reporting
      powerpc/powernv: Query firmware for count cache flush settings
      powerpc/pseries: Query hypervisor for count cache flush settings

 arch/powerpc/Kconfig                         |   7 +-
 arch/powerpc/include/asm/asm-prototypes.h    |   6 ++
 arch/powerpc/include/asm/barrier.h           |  12 ++-
 arch/powerpc/include/asm/code-patching-asm.h |  18 ++++
 arch/powerpc/include/asm/code-patching.h     |   2 +
 arch/powerpc/include/asm/feature-fixups.h    |  12 +++
 arch/powerpc/include/asm/hvcall.h            |   2 +
 arch/powerpc/include/asm/security_features.h |   7 ++
 arch/powerpc/include/asm/setup.h             |   9 +-
 arch/powerpc/kernel/Makefile                 |   3 +-
 arch/powerpc/kernel/entry_64.S               |  54 ++++++++++++
 arch/powerpc/kernel/module.c                 |   4 +-
 arch/powerpc/kernel/security.c               | 123 ++++++++++++++++++++++++++-
 arch/powerpc/kernel/vmlinux.lds.S            |  12 ++-
 arch/powerpc/lib/code-patching.c             |  16 ++++
 arch/powerpc/lib/feature-fixups.c            |  58 ++++++++++++-
 arch/powerpc/platforms/powernv/setup.c       |   7 ++
 arch/powerpc/platforms/pseries/setup.c       |   7 ++
 18 files changed, 348 insertions(+), 11 deletions(-)
 create mode 100644 arch/powerpc/include/asm/code-patching-asm.h