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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 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: HRuzon1YPHm-rIe7CYymRuOj-fBp_7OLxv-sMUlq8_w_1764691739 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true 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