From: Sebastian Ott <sebott@redhat.com>
To: Marc Zyngier <maz@kernel.org>,
Oliver Upton <oliver.upton@linux.dev>,
Joey Gouly <joey.gouly@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Cc: Cornelia Huck <cohuck@redhat.com>,
Eric Auger <eric.auger@redhat.com>,
linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
linux-kernel@vger.kernel.org
Subject: [PATCH 0/4] KVM: arm64: writable MIDR/REVIDR
Date: Mon, 10 Feb 2025 16:49:49 +0100 [thread overview]
Message-ID: <20250210154953.27002-1-sebott@redhat.com> (raw)
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
next reply other threads:[~2025-02-10 15:49 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-10 15:49 Sebastian Ott [this message]
2025-02-10 15:49 ` [PATCH 1/4] KVM: arm64: Allow userspace to change MIDR_EL1 Sebastian Ott
2025-02-10 18:12 ` Oliver Upton
2025-02-11 12:43 ` Sebastian Ott
2025-02-10 15:49 ` [PATCH 2/4] KVM: arm64: Allow userspace to change REVIDR_EL1 Sebastian Ott
2025-02-10 15:49 ` [PATCH 3/4] KVM: arm64: Allow userspace to change AIDR_EL1 Sebastian Ott
2025-02-10 15:49 ` [PATCH 4/4] KVM: arm64: trap guest access for REVIDR_EL1 and AIDR_EL1 Sebastian Ott
2025-02-10 18:16 ` [PATCH 0/4] KVM: arm64: writable MIDR/REVIDR Oliver Upton
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