From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 81C252550D5; Wed, 17 Dec 2025 10:11:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765966309; cv=none; b=LPFKIqsMzA7CvlDj2qZURCIqF2FSuVMyoRc/5bMLjRcPP+O+iL+AdUZJjtFdMCuidJdznYFUeDIm/Ety4p4OkWSeChcn5UYkGH2jaCGTWvh37cBk27puZQ/2nTysv/C1RVZBG4GJN7Fa4A+1TTDcAh2kS+6CwfKQWxfIyr5hu4o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765966309; c=relaxed/simple; bh=jpQhc4Gc/S0O1DjrdIx2xgW0Awt1vf8Kt5GI6Jqqijc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=cCKUXDQQTbr0vqvAw2slSoYdOBJx4rW0EldcA29332RAQvewI79ci0nslg6CARFm5tX4N+Ii10Uo48rPryGsLzWvZlQZ/lMjd6153efsel5V8wI+ZkwTz9qnPtQQGM5L4lpZABRaTf183L/m9TFBrSwdSS6CXfnbFscoo27XiL4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id BA7A514BF; Wed, 17 Dec 2025 02:11:38 -0800 (PST) Received: from e122027.arm.com (unknown [10.57.45.201]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id DDC673F73B; Wed, 17 Dec 2025 02:11:40 -0800 (PST) From: Steven Price To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Steven Price , Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Gavin Shan , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" , Emi Kisanuki , Vishal Annapurve Subject: [PATCH v12 00/46] arm64: Support for Arm CCA in KVM Date: Wed, 17 Dec 2025 10:10:37 +0000 Message-ID: <20251217101125.91098-1-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This series adds support for running protected VMs using KVM under the Arm Confidential Compute Architecture (CCA). I've changed the uAPI following feedback from Marc. The main change is that rather than providing a multiplex CAP and expecting the VMM to drive the different stages of realm construction, there's now just a minimal interface and KVM performs the necessary operations when needed. This series is lightly tested and is meant as a demonstration of the new uAPI. There are a number of (known) rough corners in the implementation that I haven't dealt with properly. In particular please note that this series is still targetting RMM v1.0. There is an alpha quality version of RMM v2.0 available[1]. Feedback was that there are a number of blockers for merging with RMM v1.0 and so I expect to rework this series to support RMM v2.0 before it is merged. That will necessarily involve reworking the implementation. Specifically I'm expecting improvements in: * GIC handling - passing state in registers, and allowing the host to fully emulate the GIC by allowing trap bits to be set. * PMU handling - again providing flexibility to the host's emulation. * Page size/granule size mismatch. RMM v1.0 defines the granule as 4k, RMM v2.0 provide the option for the host to change the granule size. The intention is that Linux would simply set the granule size equal to its page size which will significantly simplify the management of granules. * Some performance improvement from the use of range-based map/unmap RMI calls. This series is based on v6.19-rc1. It is also available as a git repository: https://gitlab.arm.com/linux-arm/linux-cca cca-host/v12 Work in progress changes for kvmtool are available from the git repository below: https://gitlab.arm.com/linux-arm/kvmtool-cca cca/v10 [1] https://developer.arm.com/documentation/den0137/latest/ Jean-Philippe Brucker (7): arm64: RMI: Propagate number of breakpoints and watchpoints to userspace arm64: RMI: Set breakpoint parameters through SET_ONE_REG arm64: RMI: Initialize PMCR.N with number counter supported by RMM arm64: RMI: Propagate max SVE vector length from RMM arm64: RMI: Configure max SVE vector length for a Realm arm64: RMI: Provide register list for unfinalized RMI RECs arm64: RMI: Provide accurate register list Joey Gouly (2): arm64: RMI: allow userspace to inject aborts arm64: RMI: support RSI_HOST_CALL Steven Price (34): arm64: RME: Handle Granule Protection Faults (GPFs) arm64: RMI: Add SMC definitions for calling the RMM arm64: RMI: Add wrappers for RMI calls arm64: RMI: Check for RMI support at KVM init arm64: RMI: Define the user ABI arm64: RMI: Basic infrastructure for creating a realm. KVM: arm64: Allow passing machine type in KVM creation arm64: RMI: RTT tear down arm64: RMI: Activate realm on first VCPU run arm64: RMI: Allocate/free RECs to match vCPUs KVM: arm64: vgic: Provide helper for number of list registers arm64: RMI: Support for the VGIC in realms KVM: arm64: Support timers in realm RECs arm64: RMI: Handle realm enter/exit arm64: RMI: Handle RMI_EXIT_RIPAS_CHANGE KVM: arm64: Handle realm MMIO emulation KVM: arm64: Expose support for private memory arm64: RMI: Allow populating initial contents arm64: RMI: Set RIPAS of initial memslots arm64: RMI: Create the realm descriptor arm64: RMI: Add a VMID allocator for realms arm64: RMI: Runtime faulting of memory KVM: arm64: Handle realm VCPU load KVM: arm64: Validate register access for a Realm VM KVM: arm64: Handle Realm PSCI requests KVM: arm64: WARN on injected undef exceptions arm64: Don't expose stolen time for realm guests arm64: RMI: Always use 4k pages for realms arm64: RMI: Prevent Device mappings for Realms HACK: Restore per-CPU cpu_armpmu pointer arm_pmu: Provide a mechanism for disabling the physical IRQ arm64: RMI: Enable PMU support with a realm guest KVM: arm64: Expose KVM_ARM_VCPU_REC to user space arm64: RMI: Enable realms to be created Suzuki K Poulose (3): kvm: arm64: Include kvm_emulate.h in kvm/arm_psci.h kvm: arm64: Don't expose unsupported capabilities for realm guests arm64: RMI: Allow checking SVE on VM instance Documentation/virt/kvm/api.rst | 78 +- arch/arm64/include/asm/kvm_emulate.h | 31 + arch/arm64/include/asm/kvm_host.h | 13 +- arch/arm64/include/asm/kvm_rmi.h | 137 +++ arch/arm64/include/asm/rmi_cmds.h | 508 ++++++++ arch/arm64/include/asm/rmi_smc.h | 269 +++++ arch/arm64/include/asm/virt.h | 1 + arch/arm64/kernel/cpufeature.c | 1 + arch/arm64/kvm/Kconfig | 2 + arch/arm64/kvm/Makefile | 2 +- arch/arm64/kvm/arch_timer.c | 37 +- arch/arm64/kvm/arm.c | 179 ++- arch/arm64/kvm/guest.c | 95 +- arch/arm64/kvm/hypercalls.c | 4 +- arch/arm64/kvm/inject_fault.c | 5 +- arch/arm64/kvm/mmio.c | 16 +- arch/arm64/kvm/mmu.c | 214 +++- arch/arm64/kvm/pmu-emul.c | 6 + arch/arm64/kvm/psci.c | 30 + arch/arm64/kvm/reset.c | 13 +- arch/arm64/kvm/rmi-exit.c | 207 ++++ arch/arm64/kvm/rmi.c | 1663 ++++++++++++++++++++++++++ arch/arm64/kvm/sys_regs.c | 53 +- arch/arm64/kvm/vgic/vgic-init.c | 2 +- arch/arm64/kvm/vgic/vgic-v2.c | 6 +- arch/arm64/kvm/vgic/vgic-v3.c | 14 +- arch/arm64/kvm/vgic/vgic.c | 55 +- arch/arm64/kvm/vgic/vgic.h | 20 +- arch/arm64/mm/fault.c | 28 +- drivers/perf/arm_pmu.c | 20 + include/kvm/arm_arch_timer.h | 2 + include/kvm/arm_pmu.h | 4 + include/kvm/arm_psci.h | 2 + include/linux/perf/arm_pmu.h | 7 + include/uapi/linux/kvm.h | 42 +- 35 files changed, 3650 insertions(+), 116 deletions(-) create mode 100644 arch/arm64/include/asm/kvm_rmi.h create mode 100644 arch/arm64/include/asm/rmi_cmds.h create mode 100644 arch/arm64/include/asm/rmi_smc.h create mode 100644 arch/arm64/kvm/rmi-exit.c create mode 100644 arch/arm64/kvm/rmi.c -- 2.43.0