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[2003:f6:af0e:4d00:dda5:3016:e366:575f]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4396b5267eesm85091845e9.0.2025.02.18.08.34.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Feb 2025 08:34:44 -0800 (PST) From: Sebastian Ott To: Marc Zyngier , Oliver Upton , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Shameer Kolothum Cc: Cornelia Huck , Eric Auger , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v3 0/4] KVM: arm64: writable MIDR/REVIDR Date: Tue, 18 Feb 2025 17:34:39 +0100 Message-ID: <20250218163443.32836-1-sebott@redhat.com> X-Mailer: git-send-email 2.48.1 Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: SUgY0kT7CmofsMx1OsW3rMU-YTz87-pahQgeO33J2m4_1739896485 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true 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. changes for V3: * handle VPIDR_EL2 as part of vcpu ctxt - thanks Oliver! changes for V2: * let the guest actually observe the changed MIDR_EL1 value * extra .set_user function * added selftest [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: selftests: arm64: Test writes to MIDR,REVIDR,AIDR arch/arm64/include/asm/kvm_host.h | 9 ++ arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h | 5 +- arch/arm64/kvm/hyp/nvhe/sysreg-sr.c | 10 +- arch/arm64/kvm/hyp/vhe/sysreg-sr.c | 28 ++-- arch/arm64/kvm/sys_regs.c | 137 +++++++----------- .../testing/selftests/kvm/arm64/set_id_regs.c | 32 +++- 6 files changed, 108 insertions(+), 113 deletions(-) -- 2.42.0