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{ "id": 2232152, "url": "http://patchwork.ozlabs.org/api/1.2/covers/2232152/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/cover/20260503073541.790215-1-eric.auger@redhat.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.2/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260503073541.790215-1-eric.auger@redhat.com>", "list_archive_url": null, "date": "2026-05-03T07:33:20", "name": "[v4,00/17] kvm/arm: Introduce a customizable aarch64 KVM host model", "submitter": { "id": 69187, "url": "http://patchwork.ozlabs.org/api/1.2/people/69187/?format=api", "name": "Eric Auger", "email": "eric.auger@redhat.com" }, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/cover/20260503073541.790215-1-eric.auger@redhat.com/mbox/", "series": [ { "id": 502569, "url": "http://patchwork.ozlabs.org/api/1.2/series/502569/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=502569", "date": "2026-05-03T07:33:20", "name": "kvm/arm: Introduce a customizable aarch64 KVM host model", "version": 4, "mbox": "http://patchwork.ozlabs.org/series/502569/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2232152/comments/", "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=gvJYnV/F;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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Sun, 03 May 2026 03:36:02 -0400", "from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com\n (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by\n relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3,\n cipher=TLS_AES_256_GCM_SHA384) id us-mta-562-p8La373fM-iT3TSbbUu7nw-1; Sun,\n 03 May 2026 03:35:55 -0400", "from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com\n (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93])\n (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest\n SHA256)\n (No client certificate requested)\n by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS\n id 76029195608B; Sun, 3 May 2026 07:35:53 +0000 (UTC)", "from laptop.redhat.com (unknown [10.44.48.25])\n by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP\n id 047FA1801481; Sun, 3 May 2026 07:35:46 +0000 (UTC)" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n s=mimecast20190719; t=1777793759;\n h=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n to:to:cc:cc:mime-version:mime-version:\n content-transfer-encoding:content-transfer-encoding;\n bh=eJbqFxtHUzeCNhZy2Eqbtv3ldmKnEXIaIpe/lLouE+8=;\n b=gvJYnV/FXNlN0rHJYK1dJTyyCJqOC7Nd1LbCaZWd/QLYhg07zVjAc2WPtBh6QwsADfiAHe\n h31BgruT7JlU8ieHm28++uJ0zMJ/T22dblUpjkyjaNImNKeK/JDi2ySZUi+JKAbsgwnGq5\n Q36Ljl9Rz1xmoDPFXTKugdRaudcebGk=", "X-MC-Unique": "p8La373fM-iT3TSbbUu7nw-1", "X-Mimecast-MFC-AGG-ID": "p8La373fM-iT3TSbbUu7nw_1777793754", "From": "Eric Auger <eric.auger@redhat.com>", "To": "eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org,\n qemu-arm@nongnu.org, kvmarm@lists.linux.dev, peter.maydell@linaro.org,\n richard.henderson@linaro.org, cohuck@redhat.com, sebott@redhat.com,\n skolothumtho@nvidia.com, philmd@linaro.org", "Cc": "maz@kernel.org, oliver.upton@linux.dev, pbonzini@redhat.com,\n armbru@redhat.com, berrange@redhat.com, abologna@redhat.com,\n jdenemar@redhat.com", "Subject": "[PATCH v4 00/17] kvm/arm: Introduce a customizable aarch64 KVM host\n model", "Date": "Sun, 3 May 2026 09:33:20 +0200", "Message-ID": "<20260503073541.790215-1-eric.auger@redhat.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Scanned-By": "MIMEDefang 3.4.1 on 10.30.177.93", "Received-SPF": "pass client-ip=170.10.133.124;\n envelope-from=eric.auger@redhat.com; helo=us-smtp-delivery-124.mimecast.com", "X-Spam_score_int": "12", "X-Spam_score": "1.2", "X-Spam_bar": "+", "X-Spam_report": "(1.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001,\n RCVD_IN_SBL_CSS=3.335, SPF_HELO_PASS=-0.001,\n SPF_PASS=-0.001 autolearn=no autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "This series enhances the current host KVM model with capability to\nset writable ID reg fields.\n\nSince v6.7 kernel, KVM/arm allows the userspace to overwrite the values\nof a subset of ID regs. The list of writable fields continues to grow.\nThe feature ID range is defined as the AArch64 System register space\nwith op0==3, op1=={0, 1, 3}, CRn==0, CRm=={0-7}, op2=={0-7}.\n\nThe end goal is to get more flexibility when migrating guests\nbetween different host hardware.\n\nQEMU retrieves the writable ID fields from KVM UAPI [1] and\nmatch them against a generated description of ID regs and their\nnamed fields that stem from AARCHMRS Registers.json file.\nCurrent description is based on latest 2026-03 edition.\nThe content of the generated files was compared against kernel\nlinux/arch/arm64/tools/sysreg file [3] . It is not straightforward\nto have unit tests for python scripts as there are many cases for\nfield extraction.\n\nFor each writable named field a uint64 property is created\nfollowing the \"SYSREG_<REG>_<FIELD>\" naming convention. REG and\nFIELD names are those described in ARM ARM Reference manual.\n\nThe list of SYSREG_ID properties can be retrieved through the qmp\nmonitor using query-cpu-model-expansion [2].\n\nConnie & Eric\n\nThis series can be found at:\nhttps://github.com/eauger/qemu/tree/arm-cpu-model-v4\n\nReferences:\n\n[1]\nKVM_CAP_ARM_SUPPORTED_REG_MASK_RANGES\nKVM_ARM_GET_REG_WRITABLE_MASKS\nDocumentation/virt/kvm/api.rst\n\n[2]\nqemu-system-aarch64 -qmp unix:/home/augere/TEST/QEMU/qmp-sock,server,nowait -M virt --enable-kvm -cpu custom\nsudo build/run qmp-shell /home/augere/TEST/QEMU/qmp-sock\nWelcome to the QMP low-level shell!\nConnected to QEMU 11.0.50\n(QEMU) query-cpu-model-expansion type=full model={\"name\":\"host\"}\n\n[3]\nlinux/arch/arm64/tools/sysreg and gen-sysreg.awk\n./tools/include/generated/asm/sysreg-defs.h\n\n\nCornelia Huck (4):\n target/arm/kvm: Introduce kvm_get_writable_id_regs\n arm/cpu: accessors for writable id registers\n arm-qmp-cmds: introspection for ID register props\n arm/cpu-features: document ID reg properties\n\nEric Auger (13):\n scripts: introduce scripts/update-aarch64-cpu-sysregs-header.py\n target/arm/cpu-sysregs.h.inc: Sort by name alphabetical order\n target/arm/cpu-sysregs.h.inc: Update with automatic generation\n arm/cpu: Add infra to handle generated ID register definitions\n scripts: Introduce scripts/aarch64_sysreg_helpers module\n scripts: Introduce scripts/update-aarch64-cpu-sysreg-properties.py\n target/arm/cpu-sysreg-properties.c: Generate code with new script\n arm/kvm: Allow reading all the writable ID registers\n arm/kvm: write back modified ID regs to KVM\n target/arm/kvm: Introduce kvm_arm_expose_idreg_properties\n target/arm/kvm: Special case REVIDR_EL1 and AIDR_EL1\n target/arm/kvm: Special case ID_AA64ISAR0_EL1 RES0 [24, 27] bits\n arm/cpu: Expose writable ID reg field properties on the kvm host vcpu\n model\n\n docs/system/arm/cpu-features.rst | 104 ++-\n scripts/aarch64_sysreg_helpers.py | 109 +++\n .../update-aarch64-cpu-sysreg-properties.py | 169 +++++\n scripts/update-aarch64-cpu-sysregs-header.py | 51 ++\n target/arm/arm-qmp-cmds.c | 19 +\n target/arm/cpu-idregs.h | 59 ++\n target/arm/cpu-sysreg-properties.c | 673 ++++++++++++++++++\n target/arm/cpu-sysregs.h.inc | 57 +-\n target/arm/cpu.c | 12 +\n target/arm/cpu.h | 36 +\n target/arm/cpu64.c | 26 +-\n target/arm/kvm-stub.c | 3 +-\n target/arm/kvm.c | 313 +++++++-\n target/arm/kvm_arm.h | 19 +-\n target/arm/meson.build | 3 +-\n target/arm/trace-events | 6 +\n 16 files changed, 1622 insertions(+), 37 deletions(-)\n create mode 100644 scripts/aarch64_sysreg_helpers.py\n create mode 100644 scripts/update-aarch64-cpu-sysreg-properties.py\n create mode 100755 scripts/update-aarch64-cpu-sysregs-header.py\n create mode 100644 target/arm/cpu-idregs.h\n create mode 100644 target/arm/cpu-sysreg-properties.c" }