[RFC/RFT PATCH 00/16] arm64: backport SSBS handling to v4.19-stable

From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
To: linux-arm-kernel@lists.infradead.org
Cc: Mark Rutland <mark.rutland@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Jeremy Linton <jeremy.linton@arm.com>,
	Andre Przywara <andre.przywara@arm.com>,
	Marc Zyngier <maz@kernel.org>, Will Deacon <will@kernel.org>
Subject: [RFC/RFT PATCH 00/16] arm64: backport SSBS handling to v4.19-stable
Date: Fri,  4 Oct 2019 14:04:14 +0200	[thread overview]
Message-ID: <20191004120430.11929-1-ard.biesheuvel@linaro.org> (raw)

This is a fairly mechnical backport to v4.19 of the changes needed to support
managing the SSBS state, which controls whether Speculative Store Bypass is
permitted.

I have included Jeremy's sysfs changes as well, since they are equally
suitable for stable and made for a much cleaner backport, so it made
little sense to handle them separately.

These patches are presented for review, and are not being cc'ed to the
-stable maintainers just yet.

Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Jeremy Linton <jeremy.linton@arm.com>
Cc: Andre Przywara <andre.przywara@arm.com>

Jeremy Linton (6):
  arm64: add sysfs vulnerability show for meltdown
  arm64: Provide a command line to disable spectre_v2 mitigation
  arm64: Always enable spectre-v2 vulnerability detection
  arm64: Always enable ssb vulnerability detection
  arm64: add sysfs vulnerability show for spectre-v2
  arm64: add sysfs vulnerability show for speculative store bypass

Marc Zyngier (2):
  arm64: Advertise mitigation of Spectre-v2, or lack thereof
  arm64: Force SSBS on context switch

Mark Rutland (1):
  arm64: fix SSBS sanitization

Mian Yousaf Kaukab (2):
  arm64: Add sysfs vulnerability show for spectre-v1
  arm64: enable generic CPU vulnerabilites support

Will Deacon (5):
  arm64: cpufeature: Detect SSBS and advertise to userspace
  arm64: ssbd: Add support for PSTATE.SSBS rather than trapping to EL3
  KVM: arm64: Set SCTLR_EL2.DSSBS if SSBD is forcefully disabled and
    !vhe
  arm64: docs: Document SSBS HWCAP
  arm64: ssbs: Don't treat CPUs with SSBS as unaffected by SSB

 Documentation/admin-guide/kernel-parameters.txt |   8 +-
 Documentation/arm64/elf_hwcaps.txt              |   4 +
 arch/arm64/Kconfig                              |   1 +
 arch/arm64/include/asm/cpucaps.h                |   3 +-
 arch/arm64/include/asm/cpufeature.h             |   4 -
 arch/arm64/include/asm/kvm_host.h               |  11 +
 arch/arm64/include/asm/processor.h              |  17 ++
 arch/arm64/include/asm/ptrace.h                 |   1 +
 arch/arm64/include/asm/sysreg.h                 |  19 +-
 arch/arm64/include/uapi/asm/hwcap.h             |   1 +
 arch/arm64/include/uapi/asm/ptrace.h            |   1 +
 arch/arm64/kernel/cpu_errata.c                  | 257 +++++++++++++-------
 arch/arm64/kernel/cpufeature.c                  | 122 ++++++++--
 arch/arm64/kernel/cpuinfo.c                     |   1 +
 arch/arm64/kernel/process.c                     |  31 +++
 arch/arm64/kernel/ptrace.c                      |  15 +-
 arch/arm64/kernel/ssbd.c                        |  21 ++
 arch/arm64/kvm/hyp/sysreg-sr.c                  |  11 +
 18 files changed, 407 insertions(+), 121 deletions(-)

-- 
2.20.1

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