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[2003:f6:af13:1a00:27bd:20bf:c18c:447d]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-477289e7cf5sm51104085e9.14.2025.10.30.09.59.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Oct 2025 09:59:08 -0700 (PDT) From: Sebastian Ott To: Peter Maydell , Paolo Bonzini , Eric Auger Cc: qemu-arm@nongnu.org, qemu-devel@nongnu.org, kvm@vger.kernel.org, kvmarm@lists.linux.dev, Sebastian Ott Subject: [PATCH v2 0/2] arm: add kvm-psci-version vcpu property Date: Thu, 30 Oct 2025 17:59:03 +0100 Message-ID: <20251030165905.73295-1-sebott@redhat.com> X-Mailer: git-send-email 2.51.1 MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: bmrJiveYjdGM5bz8rTFjMpKceV2F38Q7Yc9m87tRsdU_1761843550 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true Received-SPF: pass client-ip=170.10.129.124; envelope-from=sebott@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Sender: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org This series adds a vcpu knob to request a specific PSCI version from KVM via the KVM_REG_ARM_PSCI_VERSION FW register. The use case for this is to support migration between host kernels that differ in their default (a.k.a. most recent) PSCI version. Note: in order to support PSCI v0.1 we need to drop vcpu initialization with KVM_CAP_ARM_PSCI_0_2 in that case. Alternatively we could limit support to versions >=0.2 . Changes since V1 [1]: * incorporated feedback from Peter and Eric [1] https://lore.kernel.org/kvmarm/20250911144923.24259-1-sebott@redhat.com/ Sebastian Ott (2): target/arm/kvm: add constants for new PSCI versions target/arm/kvm: add kvm-psci-version vcpu property docs/system/arm/cpu-features.rst | 5 +++ target/arm/cpu.h | 6 ++++ target/arm/kvm-consts.h | 2 ++ target/arm/kvm.c | 60 +++++++++++++++++++++++++++++++- 4 files changed, 72 insertions(+), 1 deletion(-) -- 2.42.0