From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 296B73976A7; Mon, 27 Apr 2026 08:28:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777278494; cv=none; b=hXHh4W0VsoaKYRqgns0Mosgy/hLp8xmx1EMMqL7F0NgbIDB3Y6kZcT3RwtmylLWFZi26uq28/4N6bNZF7L0YCl61M/gco2pmVaJkQQVvd4Y9/uUnK7PK7WRxdYBRj6CCv8mAHyPdzCuO9UQPQTsxypLbrreNd8U73QsKsS9dKiA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777278494; c=relaxed/simple; bh=gWkVVxSq7S/AnFhRjhjyX3b4YhmSCwNgWZUHpsa5BLk=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=FwiX4RBW3JBslCQFBdqIb8f5FfkL4TuWvsGrufHAD3snIpta5jLAHmgiqrtaCxJ3vzfYl5AimGiaMfAKXb1QqYGl0Mi1INz/K69nWTQNITmKxVI2gLfmH0gKxL3BzB3DeEm9I7lJN9GCsRwFY01+mAND2n2jawtba3qzt7ibEWk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=QFYJ/60l; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="QFYJ/60l" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2A4D8C19425; Mon, 27 Apr 2026 08:28:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777278493; bh=gWkVVxSq7S/AnFhRjhjyX3b4YhmSCwNgWZUHpsa5BLk=; h=From:To:Cc:Subject:Date:From; b=QFYJ/60lml/EF+AS1cuBMCTd+OGx7qntiObO9eSix7wWQPVNTyR1h0Il6kKbuKBfN rXfEU8BAPOarfboNzoqEJ2teq/TXeJfzZCSpRP80TjnkFPAfp7voeYD0qdGcGYz0+C 5J4j/uyftxLSb1ol0w0cffY/KTVm0en2p7InEQTs+MOTO0+YEsWRaGrIDsjFnCC7Wm XEb4yboQMZazA0vZX49sFlalS5vSczzI0lUVA3xgS1YIwwHjkigboaWOT2OR215s5x TJY8IYF4zYA3F+ZL0uKlqqTZZA9REJgWxJ0l4JAbAhshl7AH0yfZWq8Sbkp/uUTFAr tU8pwxLNYP/4w== From: "Aneesh Kumar K.V (Arm)" To: linux-coco@lists.linux.dev, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: "Aneesh Kumar K.V (Arm)" , Alexey Kardashevskiy , Catalin Marinas , Dan Williams , Jason Gunthorpe , Jonathan Cameron , Marc Zyngier , Samuel Ortiz , Steven Price , Suzuki K Poulose , Will Deacon , Xu Yilun Subject: [RFC PATCH v4 00/11] coco/TSM: Arm CCA guest TDISP lock/accept flow with verification and DMA enable Date: Mon, 27 Apr 2026 13:57:54 +0530 Message-ID: <20260427082805.931832-1-aneesh.kumar@kernel.org> 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 patch series implements the TSM ->lock(), ->unlock(), and ->accept() callbacks required for the TDISP setup with Arm CCA as per as per the RMM 2.0bet1 specification [1]. The series adds the guest-side DA plumbing needed to transition a device through TDI LOCK and RUN states, verify host-provided evidence against RMM-provided digests, validate interface-report MMIO mappings, and enable DMA only after attestation succeeds. At a high level, the series includes: - guest TSM callback registration and lock/unlock/accept hooks - RHI DA helper support for TDI state transitions and object refresh - host-cached DA object fetch APIs in guest - RSI_VDEV_GET_INFO digest verification of certificate/VCA/report/measurement - mapping validation for interface-report ranges and teardown on unlock - DMA behavior updates for accepted devices (including swiotlb restrictions) - vdev DMA enable after successful attestation The series builds upon the TSM framework patches posted at [2]. A git repository containing all the related changes is available at [3]. Testing / Usage echo ${DEVICE} > /sys/bus/pci/devices/${DEVICE}/driver/unbind To transition the device to TDISP LOCK state: echo tsm0 > /sys/bus/pci/devices/${DEVICE}/tsm/lock To transition the device to TDISP RUN state: echo 1 > /sys/bus/pci/devices/${DEVICE}/tsm/accept echo ${DEVICE} > /sys/bus/pci/drivers_probe Changes from v3: https://lore.kernel.org/all/20260312080442.3485633-1-aneesh.kumar@kernel.org * updated the patches to follow the RMM 2.0bet1 specification * updated the guest-side DA code to use the renamed identity/protocol digest fields and id_index Changes from v2: rfc-v2: https://lore.kernel.org/all/20251117140007.122062-1-aneesh.kumar@kernel.org * rebase to latest kernel and core TSM changes * Address review feedback. * Interface report is now collected using core TSM framework * swiotlb is now considered shared-memory pool and is not allowed to be used by accepted devices. v1: rfc-v1: https://lore.kernel.org/all/20250728135216.48084-1-aneesh.kumar@kernel.org [1] https://developer.arm.com/documentation/den0137/2-0bet1/ [2] https://lore.kernel.org/all/20260303000207.1836586-1-dan.j.williams@intel.com [3] https://gitlab.arm.com/linux-arm/linux-cca.git cca/topics/cca-tdisp-upstream-rfc-v4 Cc: Alexey Kardashevskiy Cc: Catalin Marinas Cc: Dan Williams Cc: Jason Gunthorpe Cc: Jonathan Cameron Cc: Marc Zyngier Cc: Samuel Ortiz Cc: Steven Price Cc: Suzuki K Poulose Cc: Will Deacon Cc: Xu Yilun Aneesh Kumar K.V (Arm) (11): coco: guest: arm64: Guest TSM callback and realm device lock support coco: guest: arm64: Fix a typo in the ARM_CCA_GUEST Kconfig help string ("and" -> "an"). coco: guest: arm64: Add Realm Host Interface and guest DA helper coco: guest: arm64: Support guest-initiated TDI lock/unlock transitions coco: guest: arm64: Refresh interface-report cache during device lock coco: guest: arm64: Add measurement refresh via RHI_DA_VDEV_GET_MEASUREMENTS coco: guest: arm64: Add guest APIs to read host-cached DA objects coco: guest: arm64: Verify DA evidence with RSI_VDEV_GET_INFO digests coco: guest: arm64: Hook TSM accept to Realm TDISP RUN transition coco: arm64: dma: Update force_dma_unencrypted for accepted devices coco: guest: arm64: Enable vdev DMA after attestation arch/arm64/include/asm/mem_encrypt.h | 6 +- arch/arm64/include/asm/rhi.h | 59 ++++ arch/arm64/include/asm/rsi.h | 1 + arch/arm64/include/asm/rsi_cmds.h | 73 +++++ arch/arm64/include/asm/rsi_smc.h | 63 ++++ arch/arm64/kernel/rsi.c | 10 + arch/arm64/mm/mem_encrypt.c | 10 + drivers/virt/coco/Makefile | 2 +- drivers/virt/coco/arm-cca-guest/Kconfig | 9 +- drivers/virt/coco/arm-cca-guest/Makefile | 1 + drivers/virt/coco/arm-cca-guest/arm-cca.c | 358 +++++++++++++++++++++- drivers/virt/coco/arm-cca-guest/rhi-da.c | 356 +++++++++++++++++++++ drivers/virt/coco/arm-cca-guest/rhi-da.h | 17 + drivers/virt/coco/arm-cca-guest/rsi-da.c | 289 +++++++++++++++++ drivers/virt/coco/arm-cca-guest/rsi-da.h | 66 ++++ include/linux/swiotlb.h | 3 + kernel/dma/direct.c | 8 + kernel/dma/swiotlb.c | 3 + 18 files changed, 1326 insertions(+), 8 deletions(-) create mode 100644 drivers/virt/coco/arm-cca-guest/rhi-da.c create mode 100644 drivers/virt/coco/arm-cca-guest/rhi-da.h create mode 100644 drivers/virt/coco/arm-cca-guest/rsi-da.c create mode 100644 drivers/virt/coco/arm-cca-guest/rsi-da.h -- 2.43.0