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 41D95335560; Mon, 17 Nov 2025 14:01:01 +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=1763388061; cv=none; b=tEQ1pqN2UM66PZj0k3QLffaW9knI7kvWDgGB7t9uLvgGWVKDCH8hfUiqrbYk9uTSaY9V27UDfiUlwpVJYkouT6pu63eLtQ7R48tzmVQHO4XxXIPsBZDU6z3Lh/GioIzM1NomWMpQEV5MDTBjT8lEK13zG+vfyOa8E5FSkU6bYuI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763388061; c=relaxed/simple; bh=QOotzErKUJ2UaZQTjbPYpTcSWX1UPnLvI2XjpJa+XTE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZuHZ5LA65UCU9zGasWS4K+WwFFQphO31t+kA3ZRi6FDvQkwZi5Lj0RdALQRCqKAKfDqaiYrB7RlefvKFcsRDOxKWtgZ4SUE/r7hNDa7CGQtcms5PvmdOcwQE3IDTW4dUR73C60CYXj3PdaOOFZG9HfmiYkN3bLtIkiDY6+BCDjw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=cFeJFKjj; 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="cFeJFKjj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 69BB9C4CEF1; Mon, 17 Nov 2025 14:00:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763388060; bh=QOotzErKUJ2UaZQTjbPYpTcSWX1UPnLvI2XjpJa+XTE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cFeJFKjjC2I3ItiTyu7uG8ec2TT/gzlBySnmgzkfWN+sib6gXC9GzA3nAbxDsQjNq QNc4OqNDn7nFULZSGaoOGvUG/AGTQJx4R4a2tYFWGV5kQZ8kMTvVxfzhZYofZf+8YG OTM+vQgRKHx4WcToMLhfUKz079IQs4p1ZqVhAWnDYO7JNzehExBDjsi3299tPQ6TS4 MrqbOPE3Y8h7Cklv7WwqSsTuBmA3yeu+aR8hqbvDnoNbV6AlDnPeFOSed6MvTOSAms 9DdrJpmhneXQFlcuswhBMyucqSRg6at+p75avi728UICh0mghTxrLA++9hEikP3iDd INJdITu+3OUgw== From: "Aneesh Kumar K.V (Arm)" To: linux-coco@lists.linux.dev, kvmarm@lists.linux.dev Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, dan.j.williams@intel.com, aik@amd.com, lukas@wunner.de, Samuel Ortiz , Xu Yilun , Jason Gunthorpe , Suzuki K Poulose , Steven Price , Bjorn Helgaas , Jonathan Cameron , Catalin Marinas , Marc Zyngier , Will Deacon , Oliver Upton , "Aneesh Kumar K.V (Arm)" Subject: [PATCH v2 06/11] coco: guest: arm64: Add support for reading cached objects from host Date: Mon, 17 Nov 2025 19:30:02 +0530 Message-ID: <20251117140007.122062-7-aneesh.kumar@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251117140007.122062-1-aneesh.kumar@kernel.org> References: <20251117140007.122062-1-aneesh.kumar@kernel.org> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Teach rsi_device_start() to pull the interface report and device certificate from the host by querying size, sharing a decrypted buffer for the read, copying the payload to private memory. Also track the fetched blobs in struct cca_guest_dsc so later stages can hand them to the attestation flow. Signed-off-by: Aneesh Kumar K.V (Arm) --- arch/arm64/include/asm/rhi.h | 7 +++ drivers/virt/coco/arm-cca-guest/rhi-da.c | 80 ++++++++++++++++++++++++ drivers/virt/coco/arm-cca-guest/rhi-da.h | 1 + drivers/virt/coco/arm-cca-guest/rsi-da.h | 8 +++ 4 files changed, 96 insertions(+) diff --git a/arch/arm64/include/asm/rhi.h b/arch/arm64/include/asm/rhi.h index ce2ed8a440c3..738470dfb869 100644 --- a/arch/arm64/include/asm/rhi.h +++ b/arch/arm64/include/asm/rhi.h @@ -39,6 +39,13 @@ RHI_DA_FEATURE_VDEV_SET_TDI_STATE) #define RHI_DA_FEATURES SMC_RHI_CALL(0x004B) +#define RHI_DA_OBJECT_CERTIFICATE 0x1 +#define RHI_DA_OBJECT_MEASUREMENT 0x2 +#define RHI_DA_OBJECT_INTERFACE_REPORT 0x3 +#define RHI_DA_OBJECT_VCA 0x4 +#define RHI_DA_OBJECT_SIZE SMC_RHI_CALL(0x004C) +#define RHI_DA_OBJECT_READ SMC_RHI_CALL(0x004D) + #define RHI_DA_VDEV_CONTINUE SMC_RHI_CALL(0x0051) #define RHI_DA_VDEV_GET_INTERFACE_REPORT SMC_RHI_CALL(0x0052) diff --git a/drivers/virt/coco/arm-cca-guest/rhi-da.c b/drivers/virt/coco/arm-cca-guest/rhi-da.c index aa17bb3ee562..d29aee0fca58 100644 --- a/drivers/virt/coco/arm-cca-guest/rhi-da.c +++ b/drivers/virt/coco/arm-cca-guest/rhi-da.c @@ -248,3 +248,83 @@ int rhi_update_vdev_measurements_cache(struct pci_dev *pdev, return ret; } + +int rhi_read_cached_object(int vdev_id, int da_object_type, void **object, int *object_size) +{ + int ret; + int max_data_len; + struct page *shared_pages; + void *data_buf_shared, *data_buf_private; + struct rsi_host_call *rhicall; + + rhicall = kmalloc(sizeof(struct rsi_host_call), GFP_KERNEL); + if (!rhicall) + return -ENOMEM; + + rhicall->imm = 0; + rhicall->gprs[0] = RHI_DA_OBJECT_SIZE; + rhicall->gprs[1] = vdev_id; + rhicall->gprs[2] = da_object_type; + + ret = rsi_host_call(virt_to_phys(rhicall)); + if (ret != RSI_SUCCESS) { + ret = -EIO; + goto err_return; + } + + if (rhicall->gprs[0] != RHI_DA_SUCCESS) { + ret = -EIO; + goto err_return; + } + + /* validate against the max cache object size used on host. */ + max_data_len = rhicall->gprs[1]; + if (max_data_len > MAX_CACHE_OBJ_SIZE || max_data_len == 0) { + ret = -EIO; + goto err_return; + } + *object_size = max_data_len; + + data_buf_private = kmalloc(*object_size, GFP_KERNEL); + if (!data_buf_private) { + ret = -ENOMEM; + goto err_return; + } + + shared_pages = alloc_shared_pages(NUMA_NO_NODE, GFP_KERNEL, max_data_len); + if (!shared_pages) { + ret = -ENOMEM; + goto err_shared_alloc; + } + data_buf_shared = page_address(shared_pages); + + rhicall->imm = 0; + rhicall->gprs[0] = RHI_DA_OBJECT_READ; + rhicall->gprs[1] = vdev_id; + rhicall->gprs[2] = da_object_type; + rhicall->gprs[3] = 0; /* offset within the data buffer */ + rhicall->gprs[4] = max_data_len; + rhicall->gprs[5] = virt_to_phys(data_buf_shared); + ret = rsi_host_call(virt_to_phys(rhicall)); + if (ret != RSI_SUCCESS || rhicall->gprs[0] != RHI_DA_SUCCESS) { + ret = -EIO; + goto err_rhi_call; + } + + memcpy(data_buf_private, data_buf_shared, *object_size); + free_shared_pages(shared_pages, max_data_len); + + *object = data_buf_private; + kfree(rhicall); + return 0; + +err_rhi_call: + free_shared_pages(shared_pages, max_data_len); +err_shared_alloc: + kfree(data_buf_private); +err_return: + *object = NULL; + *object_size = 0; + kfree(rhicall); + return ret; +} diff --git a/drivers/virt/coco/arm-cca-guest/rhi-da.h b/drivers/virt/coco/arm-cca-guest/rhi-da.h index f90e0e715073..303d19a80cd0 100644 --- a/drivers/virt/coco/arm-cca-guest/rhi-da.h +++ b/drivers/virt/coco/arm-cca-guest/rhi-da.h @@ -14,4 +14,5 @@ int rhi_vdev_set_tdi_state(struct pci_dev *pdev, unsigned long target_state); int rhi_update_vdev_interface_report_cache(struct pci_dev *pdev); int rhi_update_vdev_measurements_cache(struct pci_dev *pdev, struct rhi_vdev_measurement_params *params); +int rhi_read_cached_object(int vdev_id, int da_object_type, void **object, int *object_size); #endif diff --git a/drivers/virt/coco/arm-cca-guest/rsi-da.h b/drivers/virt/coco/arm-cca-guest/rsi-da.h index 3b01182924bc..fa9cc01095da 100644 --- a/drivers/virt/coco/arm-cca-guest/rsi-da.h +++ b/drivers/virt/coco/arm-cca-guest/rsi-da.h @@ -10,8 +10,16 @@ #include #include +#define MAX_CACHE_OBJ_SIZE SZ_16M + struct cca_guest_dsc { struct pci_tsm_devsec pci; + void *interface_report; + int interface_report_size; + void *certificate; + int certificate_size; + void *measurements; + int measurements_size; }; static inline struct cca_guest_dsc *to_cca_guest_dsc(struct pci_dev *pdev) -- 2.43.0