linux-kernel - [PATCH 0/4] KVM: arm64: writable MIDR/REVIDR

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Message-ID: <20250210154953.27002-1-sebott@redhat.com>
Date: Mon, 10 Feb 2025 16:49:49 +0100
From: Sebastian Ott <sebott@...hat.com>
To: Marc Zyngier <maz@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
Cc: Cornelia Huck <cohuck@...hat.com>,
	Eric Auger <eric.auger@...hat.com>,
	linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/4] KVM: arm64: writable MIDR/REVIDR

Based on prior discussion [1] this series allows VMMs to change
MIDR/REVIDR to enable migration between machines that differ in
these registers. Since these are used for errata handling the
errata management series [2] is a prerequisite for this one.

Note that guest access to MIDR_EL1 is not trapped.

[1] https://lore.kernel.org/kvmarm/20250124151732.6072-1-shameerali.kolothum.thodi@huawei.com/T/#mb855bc51714095a164a7b26bb8bead1606e4b753
[2] https://lore.kernel.org/kvmarm/20250205132222.55816-1-shameerali.kolothum.thodi@huawei.com/T/

Sebastian Ott (4):
  KVM: arm64: Allow userspace to change MIDR_EL1
  KVM: arm64: Allow userspace to change REVIDR_EL1
  KVM: arm64: Allow userspace to change AIDR_EL1
  KVM: arm64: trap guest access for REVIDR_EL1 and AIDR_EL1

 arch/arm64/include/asm/kvm_host.h |   9 ++
 arch/arm64/kvm/sys_regs.c         | 134 +++++++++++-------------------
 2 files changed, 56 insertions(+), 87 deletions(-)

-- 
2.42.0