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From: Will Deacon <will@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-arch@vger.kernel.org, Will Deacon <will@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Marc Zyngier <maz@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Morten Rasmussen <morten.rasmussen@arm.com>,
	Qais Yousef <qais.yousef@arm.com>,
	Suren Baghdasaryan <surenb@google.com>,
	Quentin Perret <qperret@google.com>,
	kernel-team@android.com
Subject: [PATCH v2 0/6] An alternative series for asymmetric AArch32 systems
Date: Mon,  9 Nov 2020 21:30:16 +0000	[thread overview]
Message-ID: <20201109213023.15092-1-will@kernel.org> (raw)

Hello again,

This is version two of the ravingly popular series I previously posted
here:

https://lore.kernel.org/r/20201021104611.2744565-1-qais.yousef@arm.com

Changes since v1 include:

  * Fix setting of compat hwcaps
  * Simplify sysfs code to use DEVICE_ATTR_RO()
  * Allow onlining of late CPUs in face of mismatch
  * Use a static key in the context-switch path
  * Avoid printing that we detected 32-bit EL0 support when we didn't

This has unfortunately introduced more complexity than I would've liked,
but it also seems to be free of any rough edges.

I haven't yet tackled the execve() problem raised by Suren. I've got some
local hacks, but nothing I'm happy with yet. They will come as follow-up
patches in any case.

As before, I don't think we should merge this stuff until we've figured
out what's going on in Android, but hopefully we can reach some agreement
on the basics before then.

Cheers,

Will

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Morten Rasmussen <morten.rasmussen@arm.com>
Cc: Qais Yousef <qais.yousef@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Quentin Perret <qperret@google.com>
Cc: kernel-team@android.com

--->8

Will Deacon (6):
  arm64: cpuinfo: Split AArch32 registers out into a separate struct
  arm64: Allow mismatched 32-bit EL0 support
  KVM: arm64: Kill 32-bit vCPUs on systems with mismatched EL0 support
  arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs
  arm64: Advertise CPUs capable of running 32-bit applications in sysfs
  arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0

 .../ABI/testing/sysfs-devices-system-cpu      |   9 +
 .../admin-guide/kernel-parameters.txt         |   7 +
 arch/arm64/include/asm/cpu.h                  |  44 ++--
 arch/arm64/include/asm/cpucaps.h              |   2 +-
 arch/arm64/include/asm/cpufeature.h           |   8 +-
 arch/arm64/kernel/cpufeature.c                | 198 ++++++++++++++----
 arch/arm64/kernel/cpuinfo.c                   |  53 ++---
 arch/arm64/kernel/process.c                   |  19 +-
 arch/arm64/kernel/signal.c                    |  26 +++
 arch/arm64/kvm/arm.c                          |  11 +-
 10 files changed, 288 insertions(+), 89 deletions(-)

-- 
2.29.2.222.g5d2a92d10f8-goog


WARNING: multiple messages have this Message-ID
From: Will Deacon <will@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-arch@vger.kernel.org, Marc Zyngier <maz@kernel.org>,
	kernel-team@android.com, Quentin Perret <qperret@google.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Qais Yousef <qais.yousef@arm.com>,
	Suren Baghdasaryan <surenb@google.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Will Deacon <will@kernel.org>,
	Morten Rasmussen <morten.rasmussen@arm.com>
Subject: [PATCH v2 0/6] An alternative series for asymmetric AArch32 systems
Date: Mon,  9 Nov 2020 21:30:16 +0000	[thread overview]
Message-ID: <20201109213023.15092-1-will@kernel.org> (raw)

Hello again,

This is version two of the ravingly popular series I previously posted
here:

https://lore.kernel.org/r/20201021104611.2744565-1-qais.yousef@arm.com

Changes since v1 include:

  * Fix setting of compat hwcaps
  * Simplify sysfs code to use DEVICE_ATTR_RO()
  * Allow onlining of late CPUs in face of mismatch
  * Use a static key in the context-switch path
  * Avoid printing that we detected 32-bit EL0 support when we didn't

This has unfortunately introduced more complexity than I would've liked,
but it also seems to be free of any rough edges.

I haven't yet tackled the execve() problem raised by Suren. I've got some
local hacks, but nothing I'm happy with yet. They will come as follow-up
patches in any case.

As before, I don't think we should merge this stuff until we've figured
out what's going on in Android, but hopefully we can reach some agreement
on the basics before then.

Cheers,

Will

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Morten Rasmussen <morten.rasmussen@arm.com>
Cc: Qais Yousef <qais.yousef@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Quentin Perret <qperret@google.com>
Cc: kernel-team@android.com

--->8

Will Deacon (6):
  arm64: cpuinfo: Split AArch32 registers out into a separate struct
  arm64: Allow mismatched 32-bit EL0 support
  KVM: arm64: Kill 32-bit vCPUs on systems with mismatched EL0 support
  arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs
  arm64: Advertise CPUs capable of running 32-bit applications in sysfs
  arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0

 .../ABI/testing/sysfs-devices-system-cpu      |   9 +
 .../admin-guide/kernel-parameters.txt         |   7 +
 arch/arm64/include/asm/cpu.h                  |  44 ++--
 arch/arm64/include/asm/cpucaps.h              |   2 +-
 arch/arm64/include/asm/cpufeature.h           |   8 +-
 arch/arm64/kernel/cpufeature.c                | 198 ++++++++++++++----
 arch/arm64/kernel/cpuinfo.c                   |  53 ++---
 arch/arm64/kernel/process.c                   |  19 +-
 arch/arm64/kernel/signal.c                    |  26 +++
 arch/arm64/kvm/arm.c                          |  11 +-
 10 files changed, 288 insertions(+), 89 deletions(-)

-- 
2.29.2.222.g5d2a92d10f8-goog


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             reply	other threads:[~2020-11-09 21:30 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-09 21:30 Will Deacon [this message]
2020-11-09 21:30 ` Will Deacon
2020-11-09 21:30 ` [PATCH v2 1/6] arm64: cpuinfo: Split AArch32 registers out into a separate struct Will Deacon
2020-11-09 21:30   ` Will Deacon
2020-11-09 21:30 ` [PATCH v2 2/6] arm64: Allow mismatched 32-bit EL0 support Will Deacon
2020-11-09 21:30   ` Will Deacon
2020-11-11 19:10   ` Catalin Marinas
2020-11-11 19:10     ` Catalin Marinas
2020-11-13  9:36     ` Will Deacon
2020-11-13  9:36       ` Will Deacon
2020-11-13 10:26       ` Catalin Marinas
2020-11-13 10:26         ` Catalin Marinas
2020-11-09 21:30 ` [PATCH v2 3/6] KVM: arm64: Kill 32-bit vCPUs on systems with mismatched " Will Deacon
2020-11-09 21:30   ` Will Deacon
2020-11-10  9:33   ` Marc Zyngier
2020-11-10  9:33     ` Marc Zyngier
2020-11-09 21:30 ` [PATCH v2 4/6] arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs Will Deacon
2020-11-09 21:30   ` Will Deacon
2020-11-09 21:30 ` [PATCH v2 5/6] arm64: Advertise CPUs capable of running 32-bit applications in sysfs Will Deacon
2020-11-09 21:30   ` Will Deacon
2020-11-10  7:04   ` Greg Kroah-Hartman
2020-11-10  7:04     ` Greg Kroah-Hartman
2020-11-10  9:28     ` Catalin Marinas
2020-11-10  9:28       ` Catalin Marinas
2020-11-10  9:36       ` Greg Kroah-Hartman
2020-11-10  9:36         ` Greg Kroah-Hartman
2020-11-10  9:53         ` Marc Zyngier
2020-11-10  9:53           ` Marc Zyngier
2020-11-10 10:10           ` Greg Kroah-Hartman
2020-11-10 10:10             ` Greg Kroah-Hartman
2020-11-10 10:46             ` Marc Zyngier
2020-11-10 10:46               ` Marc Zyngier
2020-11-10 10:57         ` Catalin Marinas
2020-11-10 10:57           ` Catalin Marinas
2020-11-09 21:30 ` [PATCH v2 6/6] arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 Will Deacon
2020-11-09 21:30   ` Will Deacon

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