From: Marc Zyngier <maz@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: Hector Martin <marcan@marcan.st>, Arnd Bergmann <arnd@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Will Deacon <will@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
kernel-team@android.com
Subject: [PATCH v3 0/3] arm64: Dealing with VHE-only CPUs
Date: Thu, 8 Apr 2021 14:10:07 +0100 [thread overview]
Message-ID: <20210408131010.1109027-1-maz@kernel.org> (raw)
This short series is a rewrite of [0] after some reviewing from
Will. It simplifies the esoteric "stay at EL2" path, and move the
feature override code where it actually belongs, allowing us to tell
the user that no, nVHE isn't a thing on these system.
The last patch rids us of CONFIG_ARM64_VHE, which has been the default
for longer than I can remember.
This allows the infamous M1 to boot (tested on a M1 Mini).
Note: the last patch will conflict with the KVM SVE series, so I'd
like to take that patch (or the series) via the KVM tree to avoid
extra moaning^Wfriction.
* From v2 [2]:
- Fixed typos and spacing issues
- Dropped the mVHE on VHE patch
- Added a patch removing the CONFIG_ARM64_VHE option altogether
- Collected Ack from Will
* From v1 [1]:
- added a comment describing the mapping various states
the override mask/val tuple can describe
- added a patch to prevent KVM from initialising, treating
the lack of CONFIG_ARM64_VHE as a mismatched boot
[0] https://lore.kernel.org/r/20210304213902.83903-2-marcan@marcan.st
[1] https://lore.kernel.org/r/20210325124721.941182-1-maz@kernel.org
[2] https://lore.kernel.org/r/20210330173947.999859-1-maz@kernel.org
Marc Zyngier (3):
arm64: cpufeature: Allow early filtering of feature override
arm64: Cope with CPUs stuck in VHE mode
arm64: Get rid of CONFIG_ARM64_VHE
.../admin-guide/kernel-parameters.txt | 3 +-
arch/arm64/Kconfig | 20 ----------
arch/arm64/include/asm/cpufeature.h | 17 ++++++++
arch/arm64/kernel/cpufeature.c | 10 +++--
arch/arm64/kernel/head.S | 39 +++++++++++++++++--
arch/arm64/kernel/hyp-stub.S | 10 ++---
arch/arm64/kernel/idreg-override.c | 26 ++++++++++++-
7 files changed, 89 insertions(+), 36 deletions(-)
--
2.29.2
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next reply other threads:[~2021-04-08 13:12 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-08 13:10 Marc Zyngier [this message]
2021-04-08 13:10 ` [PATCH v3 1/3] arm64: cpufeature: Allow early filtering of feature override Marc Zyngier
2021-04-08 13:10 ` [PATCH v3 2/3] arm64: Cope with CPUs stuck in VHE mode Marc Zyngier
2021-04-08 13:10 ` [PATCH v3 3/3] arm64: Get rid of CONFIG_ARM64_VHE Marc Zyngier
2021-04-08 16:59 ` Will Deacon
2021-04-08 17:24 ` Marc Zyngier
2021-04-08 21:47 ` Arnd Bergmann
2021-04-09 8:28 ` Marc Zyngier
2021-04-08 18:00 ` [PATCH v3 0/3] arm64: Dealing with VHE-only CPUs Catalin Marinas
2021-04-08 18:08 ` Marc Zyngier
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