All of lore.kernel.org
 help / color / mirror / Atom feed
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>,
	kernel-team@android.com
Subject: [PATCH 0/6] An alternative series for asymmetric AArch32 systems
Date: Tue, 27 Oct 2020 21:51:12 +0000	[thread overview]
Message-ID: <20201027215118.27003-1-will@kernel.org> (raw)

Hi all,

I was playing around with the asymmetric AArch32 RFCv2 from Qais:

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

and ended up writing my own implementation this afternoon. I think it's
smaller, simpler and easier to work with. In particular:

  * I got rid of the sysctl in favour of a plain cmdline parameter
  * I don't have a new CPU capability
  * I don't have a new thread flag
  * I expose a cpumask to userspace via sysfs to identify the 32-bit CPUs

Anyway, I don't think we should merge this stuff (other than the first patch)
until we've figured out what's going on in Android, but I wanted to get
this out as something which we might be able to build on.

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: kernel-team@android.com

--->8

Qais Yousef (1):
  KVM: arm64: Handle Asymmetric AArch32 systems

Will Deacon (5):
  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 applcations in sysfs
  arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0

 .../ABI/testing/sysfs-devices-system-cpu      |  8 ++
 .../admin-guide/kernel-parameters.txt         |  7 ++
 arch/arm64/include/asm/cpufeature.h           |  3 +
 arch/arm64/kernel/cpufeature.c                | 80 ++++++++++++++++++-
 arch/arm64/kernel/process.c                   | 21 ++++-
 arch/arm64/kernel/signal.c                    | 26 ++++++
 arch/arm64/kvm/arm.c                          | 27 +++++++
 7 files changed, 168 insertions(+), 4 deletions(-)

-- 
2.29.0.rc2.309.g374f81d7ae-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, 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 0/6] An alternative series for asymmetric AArch32 systems
Date: Tue, 27 Oct 2020 21:51:12 +0000	[thread overview]
Message-ID: <20201027215118.27003-1-will@kernel.org> (raw)

Hi all,

I was playing around with the asymmetric AArch32 RFCv2 from Qais:

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

and ended up writing my own implementation this afternoon. I think it's
smaller, simpler and easier to work with. In particular:

  * I got rid of the sysctl in favour of a plain cmdline parameter
  * I don't have a new CPU capability
  * I don't have a new thread flag
  * I expose a cpumask to userspace via sysfs to identify the 32-bit CPUs

Anyway, I don't think we should merge this stuff (other than the first patch)
until we've figured out what's going on in Android, but I wanted to get
this out as something which we might be able to build on.

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: kernel-team@android.com

--->8

Qais Yousef (1):
  KVM: arm64: Handle Asymmetric AArch32 systems

Will Deacon (5):
  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 applcations in sysfs
  arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0

 .../ABI/testing/sysfs-devices-system-cpu      |  8 ++
 .../admin-guide/kernel-parameters.txt         |  7 ++
 arch/arm64/include/asm/cpufeature.h           |  3 +
 arch/arm64/kernel/cpufeature.c                | 80 ++++++++++++++++++-
 arch/arm64/kernel/process.c                   | 21 ++++-
 arch/arm64/kernel/signal.c                    | 26 ++++++
 arch/arm64/kvm/arm.c                          | 27 +++++++
 7 files changed, 168 insertions(+), 4 deletions(-)

-- 
2.29.0.rc2.309.g374f81d7ae-goog


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

             reply	other threads:[~2020-10-27 21:51 UTC|newest]

Thread overview: 96+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-27 21:51 Will Deacon [this message]
2020-10-27 21:51 ` Will Deacon
2020-10-27 21:51 ` [PATCH 1/6] KVM: arm64: Handle Asymmetric " Will Deacon
2020-10-27 21:51   ` Will Deacon
2020-10-27 21:51 ` [PATCH 2/6] arm64: Allow mismatched 32-bit EL0 support Will Deacon
2020-10-27 21:51   ` Will Deacon
2020-10-28 11:12   ` Catalin Marinas
2020-10-28 11:12     ` Catalin Marinas
2020-10-28 11:17     ` Will Deacon
2020-10-28 11:17       ` Will Deacon
2020-10-28 11:22       ` Catalin Marinas
2020-10-28 11:22         ` Catalin Marinas
2020-10-28 11:23         ` Will Deacon
2020-10-28 11:23           ` Will Deacon
2020-10-28 11:49           ` Catalin Marinas
2020-10-28 11:49             ` Catalin Marinas
2020-10-28 12:40             ` Will Deacon
2020-10-28 12:40               ` Will Deacon
2020-10-28 18:56               ` Catalin Marinas
2020-10-28 18:56                 ` Catalin Marinas
2020-10-29 22:20                 ` Will Deacon
2020-10-29 22:20                   ` Will Deacon
2020-10-30 11:18                   ` Catalin Marinas
2020-10-30 11:18                     ` Catalin Marinas
2020-10-30 16:13                     ` Will Deacon
2020-10-30 16:13                       ` Will Deacon
2020-11-02 11:44                       ` Catalin Marinas
2020-11-02 11:44                         ` Catalin Marinas
2020-11-05 21:38                         ` Will Deacon
2020-11-05 21:38                           ` Will Deacon
2020-11-06 12:54                           ` Qais Yousef
2020-11-06 12:54                             ` Qais Yousef
2020-11-06 13:00                             ` Will Deacon
2020-11-06 13:00                               ` Will Deacon
2020-11-06 14:48                               ` Qais Yousef
2020-11-06 14:48                                 ` Qais Yousef
2020-11-09 13:52                                 ` Will Deacon
2020-11-09 13:52                                   ` Will Deacon
2020-11-11 16:27                                   ` Qais Yousef
2020-11-11 16:27                                     ` Qais Yousef
2020-11-12 10:24                                     ` Will Deacon
2020-11-12 10:24                                       ` Will Deacon
2020-11-12 11:55                                       ` Qais Yousef
2020-11-12 11:55                                         ` Qais Yousef
2020-11-12 16:49                                         ` Qais Yousef
2020-11-12 16:49                                           ` Qais Yousef
2020-11-12 17:06                                           ` Marc Zyngier
2020-11-12 17:06                                             ` Marc Zyngier
2020-11-12 17:36                                             ` Qais Yousef
2020-11-12 17:36                                               ` Qais Yousef
2020-11-12 17:44                                               ` Will Deacon
2020-11-12 17:44                                                 ` Will Deacon
2020-11-12 17:36                                           ` Will Deacon
2020-11-12 17:36                                             ` Will Deacon
2020-11-13 10:45                                             ` Qais Yousef
2020-11-13 10:45                                               ` Qais Yousef
2020-11-06 14:30                           ` Catalin Marinas
2020-11-06 14:30                             ` Catalin Marinas
2020-10-28 11:18   ` Catalin Marinas
2020-10-28 11:18     ` Catalin Marinas
2020-10-28 11:21     ` Will Deacon
2020-10-28 11:21       ` Will Deacon
2020-10-27 21:51 ` [PATCH 3/6] KVM: arm64: Kill 32-bit vCPUs on systems with mismatched " Will Deacon
2020-10-27 21:51   ` Will Deacon
2020-10-27 21:51 ` [PATCH 4/6] arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs Will Deacon
2020-10-27 21:51   ` Will Deacon
2020-10-28 12:10   ` Catalin Marinas
2020-10-28 12:10     ` Catalin Marinas
2020-10-28 12:36     ` Will Deacon
2020-10-28 12:36       ` Will Deacon
2020-10-27 21:51 ` [PATCH 5/6] arm64: Advertise CPUs capable of running 32-bit applcations in sysfs Will Deacon
2020-10-27 21:51   ` Will Deacon
2020-10-28  8:37   ` Greg Kroah-Hartman
2020-10-28  8:37     ` Greg Kroah-Hartman
2020-10-28  9:51     ` Will Deacon
2020-10-28  9:51       ` Will Deacon
2020-10-28 12:15   ` Catalin Marinas
2020-10-28 12:15     ` Catalin Marinas
2020-10-28 12:27     ` Will Deacon
2020-10-28 12:27       ` Will Deacon
2020-10-28 15:14       ` Catalin Marinas
2020-10-28 15:14         ` Catalin Marinas
2020-10-28 15:35         ` Will Deacon
2020-10-28 15:35           ` Will Deacon
2020-10-27 21:51 ` [PATCH 6/6] arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 Will Deacon
2020-10-27 21:51   ` Will Deacon
2020-10-29 18:42 ` [PATCH 0/6] An alternative series for asymmetric AArch32 systems Suren Baghdasaryan
2020-10-29 18:42   ` Suren Baghdasaryan
2020-10-29 22:17   ` Will Deacon
2020-10-29 22:17     ` Will Deacon
2020-10-30 16:16 ` Marc Zyngier
2020-10-30 16:16   ` Marc Zyngier
2020-10-30 16:24   ` Will Deacon
2020-10-30 16:24     ` Will Deacon
2020-10-30 17:04     ` Marc Zyngier
2020-10-30 17:04       ` Marc Zyngier

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20201027215118.27003-1-will@kernel.org \
    --to=will@kernel.org \
    --cc=catalin.marinas@arm.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=kernel-team@android.com \
    --cc=linux-arch@vger.kernel.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=maz@kernel.org \
    --cc=morten.rasmussen@arm.com \
    --cc=peterz@infradead.org \
    --cc=qais.yousef@arm.com \
    --cc=surenb@google.com \
    --subject='Re: [PATCH 0/6] An alternative series for asymmetric AArch32 systems' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.