linux-kernel - [RFC PATCH v1 0/2] KVM: arm64: Making BT Field in ID_AA64PFR1

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Message-Id: <20240612023553.127813-1-shahuang@redhat.com>
Date: Tue, 11 Jun 2024 22:35:50 -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>,
	James Morse <james.morse@....com>,
	kvm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.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] KVM: arm64: Making BT Field in ID_AA64PFR1_EL1 writable

Hi guys,

I'm trying to enable migration from MtCollins(Ampere Altra, ARMv8.2+) to
AmpereOne(AmpereOne, ARMv8.6+), the migration always fails when migration from
MtCollins to AmpereOne due to some register fields differing between the
two machines.

In this patch series, we try to make more register fields writable like
ID_AA64PFR1_EL1.BT. This is first step towards making the migration possible.
Some other hurdles need to be overcome. This is not sufficient to make the
migration successful from MtCollins to AmpereOne.

Shaoqin Huang (2):
  KVM: arm64: Allow BT field in ID_AA64PFR1_EL1 writable
  KVM: selftests: aarch64: Add writable test for ID_AA64PFR1_EL1

 arch/arm64/kvm/sys_regs.c                         | 2 +-
 tools/testing/selftests/kvm/aarch64/set_id_regs.c | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

-- 
2.40.1