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[2003:f6:af35:a800:883b:71b:f1f3:e4b6]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-42e1caa767dsm34300899f8f.38.2025.12.02.08.08.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Dec 2025 08:08:58 -0800 (PST) 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 v4 0/2] arm: add kvm-psci-version vcpu property Date: Tue, 2 Dec 2025 17:08:51 +0100 Message-ID: <20251202160853.22560-1-sebott@redhat.com> X-Mailer: git-send-email 2.52.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.133.124; 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, DKIMWL_WL_HIGH=-0.001, 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_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_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-devel@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-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=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 V3 [3]: * changed variable name as requested by Eric * added R-B Changes since V2 [2]: * fix kvm_get_psci_version() when the prop is not specified - thanks Eric! * removed the assertion in kvm_get_psci_version() so that this also works with a future kernel/psci version * added R-B Changes since V1 [1]: * incorporated feedback from Peter and Eric [1] https://lore.kernel.org/kvmarm/20250911144923.24259-1-sebott@redhat.com/ [2] https://lore.kernel.org/kvmarm/20251030165905.73295-1-sebott@redhat.com/ [3] https://lore.kernel.org/kvmarm/20251112181357.38999-1-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 | 64 +++++++++++++++++++++++++++++++- 4 files changed, 76 insertions(+), 1 deletion(-) -- 2.42.0