linux-kernel - [RFC PATCH v1 0/2] Allow the RAS feature bit in ID_AA64PFR0

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Message-Id: <20240926032244.3666579-1-shahuang@redhat.com>
Date: Wed, 25 Sep 2024 23:22:38 -0400
From: Shaoqin Huang <shahuang@...hat.com>
To: Oliver Upton <oliver.upton@...ux.dev>,
	Marc Zyngier <maz@...nel.org>,
	kvmarm@...ts.linux.dev
Cc: Eric Auger <eauger@...hat.com>,
	Sebastian Ott <sebott@...hat.com>,
	Cornelia Huck <cohuck@...hat.com>,
	Shaoqin Huang <shahuang@...hat.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Fuad Tabba <tabba@...gle.com>,
	James Morse <james.morse@....com>,
	Joey Gouly <joey.gouly@....com>,
	Kristina Martsenko <kristina.martsenko@....com>,
	kvm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	Mark Brown <broonie@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Shuah Khan <shuah@...nel.org>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Will Deacon <will@...nel.org>,
	Zenghui Yu <yuzenghui@...wei.com>
Subject: [RFC PATCH v1 0/2] Allow the RAS feature bit in ID_AA64PFR0_EL1 writable from userspace

Currently the RAS feature bit is not writable in ID_AA64PFR0EL1, this makes
migration fail when migration from the machine which RAS is 1 to another machine
which RAS is 2.

Allow RAS writable from userspace would make the migration possible between two
machines which RAS is different.

Shaoqin Huang (2):
  KVM: arm64: Use kvm_has_feat() to check if FEAT_RAS is advertised to
    the guest
  KVM: arm64: Allow the RAS feature bit in ID_AA64PFR0_EL1 writable from
    userspace

 arch/arm64/kvm/guest.c                            | 4 ++--
 arch/arm64/kvm/handle_exit.c                      | 2 +-
 arch/arm64/kvm/hyp/include/hyp/switch.h           | 2 +-
 arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h        | 7 +++++--
 arch/arm64/kvm/sys_regs.c                         | 3 +--
 tools/testing/selftests/kvm/aarch64/set_id_regs.c | 1 +
 6 files changed, 11 insertions(+), 8 deletions(-)

-- 
2.40.1