From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E3434FF8861 for ; Mon, 27 Apr 2026 08:55:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=JD3aB2fSkBp0yYWaau8EIRlpmOc3Z2RtcZjPf+utyjk=; b=EDchdconS6ke20uJkXfEBUmnrx P8Cnud+tGFw76xWQMyBV1hRUPNSP2YwrZfD1o5oPhzd3+wLvYpHEjPGnr4+5f+MWQc44zY7h34LiL mrpFMj6Y454ncEOcpuQOF/yGq6zVZiLItnzQCdJeQQ9hUQ0cRJCjyYLUWIGs6eut5pc68v0wLWaXl p302XMOHsprSzeo9UGwfEgakE0mgT8NqmWvya0n6j54nWbMFLmr1/Gls7kbrFAFkgQ0noex2dPciy 8Sm4cbbVyBKiWbUmZ+0DDkYn+zc372Q5/e1XfKmDngSLjlL5chAlde16oCl/HrM8eRjjUfPS39yfS bjM5TWkA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wHHk2-0000000GVIu-3vMX; Mon, 27 Apr 2026 08:54:58 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wHHjx-0000000GVEg-3UD8 for linux-arm-kernel@lists.infradead.org; Mon, 27 Apr 2026 08:54:55 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 7160943ECE; Mon, 27 Apr 2026 08:54:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B3517C2BCB4; Mon, 27 Apr 2026 08:54:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777280093; bh=akRHKPpwP0Keb8Cw+nrNL5vDKueX0ZffUjJeuchV62o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dwsVc26Yxm+WwPUISGblrpOpc8ZD3m+PtODyezcu55Wv3ajEF/+uiDCjdsjBE/alT jCYZSOtJryXS9h2S2+qAY+AGysn9K4u+Ba3JKk5ZO37OivumnXDWIGjnmJaCAC47aH eXsyDAgAfv1Ps4jMf8adIE1pRiQllX8MZ83L7kTSBbZ5NlAzv6BlFihXWd3/dqE8tn bnGI1r6GDsMAtRIhvtT3yDT1NHn53zjKEmShbMBqrYZqeAVUYgRs/eIpEc7eIJV2mG a1sArosFbsKWO1ypUsfvbDfD1UpYazjf7LnBBZpL4MUaj1n9vdEAlb3nnI/7pa9Lox tn1HVLt2hML7A== 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 , Joerg Roedel , Jonathan Cameron , Marc Zyngier , Nicolin Chen , Pranjal Shrivastava , Robin Murphy , Samuel Ortiz , Steven Price , Suzuki K Poulose , Will Deacon , Xu Yilun Subject: [RFC PATCH v4 09/16] coco: host: arm64: Add support for da object read RHI handling Date: Mon, 27 Apr 2026 14:23:37 +0530 Message-ID: <20260427085344.941627-10-aneesh.kumar@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260427085344.941627-1-aneesh.kumar@kernel.org> References: <20260427085344.941627-1-aneesh.kumar@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260427_015453_957250_F3458D80 X-CRM114-Status: GOOD ( 22.33 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Device assignment-related RHI calls result in a REC exit, which is handled by the tsm guest_request callback. Signed-off-by: Aneesh Kumar K.V (Arm) --- arch/arm64/include/uapi/asm/rmi-da.h | 21 ++++++ drivers/virt/coco/arm-cca-host/arm-cca.c | 74 ++++++++++++++++++ drivers/virt/coco/arm-cca-host/rmi-da.c | 95 ++++++++++++++++++++++++ drivers/virt/coco/arm-cca-host/rmi-da.h | 3 + 4 files changed, 193 insertions(+) create mode 100644 arch/arm64/include/uapi/asm/rmi-da.h diff --git a/arch/arm64/include/uapi/asm/rmi-da.h b/arch/arm64/include/uapi/asm/rmi-da.h new file mode 100644 index 000000000000..5ec3413dce94 --- /dev/null +++ b/arch/arm64/include/uapi/asm/rmi-da.h @@ -0,0 +1,21 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ + +#ifndef _UAPI__ASM_RMI_DA_H +#define _UAPI__ASM_RMI_DA_H + +#include + +struct arm64_vdev_object_size_guest_req { + __u32 req_type; + __u32 object_type; +}; +#define __RHI_DA_OBJECT_SIZE 0x1 + +struct arm64_vdev_object_read_guest_req { + __u32 req_type; + __u32 object_type; + __aligned_u64 offset; +}; +#define __RHI_DA_OBJECT_READ 0x2 + +#endif diff --git a/drivers/virt/coco/arm-cca-host/arm-cca.c b/drivers/virt/coco/arm-cca-host/arm-cca.c index b75fa20513a9..4bf1f1b394af 100644 --- a/drivers/virt/coco/arm-cca-host/arm-cca.c +++ b/drivers/virt/coco/arm-cca-host/arm-cca.c @@ -14,6 +14,7 @@ #include #include #include +#include #include "rmi-da.h" @@ -497,6 +498,78 @@ static void cca_tsm_unbind(struct pci_tdi *tdi) kfree(host_tdi); } +static ssize_t cca_tsm_guest_req(struct pci_tdi *tdi, enum pci_tsm_req_scope scope, + sockptr_t req, size_t req_len, sockptr_t resp, + size_t resp_len, u64 *tsm_code) +{ + struct pci_dev *pdev = tdi->pdev; + + if (req.is_kernel || resp.is_kernel) + return -EINVAL; + + switch (scope) { + case PCI_TSM_REQ_INFO: { + u32 req_type; + + if (get_user(req_type, (u32 __user *)req.user)) + return -EFAULT; + + switch (req_type) { + case __RHI_DA_OBJECT_SIZE: { + int object_size; + struct arm64_vdev_object_size_guest_req req_obj; + + if (req_len != sizeof(req_obj)) + return -EINVAL; + + if (copy_from_user((void *)&req_obj, req.user, req_len)) + return -EFAULT; + object_size = cca_vdev_get_object_size(pdev, req_obj.object_type); + if (object_size > 0) { + if (resp_len < sizeof(object_size)) + return -EINVAL; + if (copy_to_user(resp.user, &object_size, sizeof(object_size))) + return -EFAULT; + + if (resp_len != sizeof(object_size)) + return resp_len - sizeof(object_size); + return 0; + } + /* error */ + return object_size; + } + case __RHI_DA_OBJECT_READ: + { + int len; + struct arm64_vdev_object_read_guest_req req_obj; + + if (req_len != sizeof(req_obj)) + return -EINVAL; + + if (copy_from_user((void *)&req_obj, req.user, req_len)) + return -EFAULT; + + len = cca_vdev_read_cached_object(pdev, + req_obj.object_type, + req_obj.offset, + resp_len, resp.user); + if (len > 0) { + if (resp_len != len) + return resp_len - len; + return 0; + } + /* error */ + return len; + } + default: + return -EINVAL; + } + } + default: + return -EINVAL; + } +} + static struct pci_tsm_ops cca_link_pci_ops = { .probe = cca_tsm_pci_probe, .remove = cca_tsm_pci_remove, @@ -504,6 +577,7 @@ static struct pci_tsm_ops cca_link_pci_ops = { .disconnect = cca_tsm_disconnect, .bind = cca_tsm_bind, .unbind = cca_tsm_unbind, + .guest_req = cca_tsm_guest_req, }; static void cca_link_tsm_remove(void *tsm_dev) diff --git a/drivers/virt/coco/arm-cca-host/rmi-da.c b/drivers/virt/coco/arm-cca-host/rmi-da.c index ef25392562e0..3db42c21dab0 100644 --- a/drivers/virt/coco/arm-cca-host/rmi-da.c +++ b/drivers/virt/coco/arm-cca-host/rmi-da.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #include "rmi-da.h" @@ -1136,3 +1137,97 @@ void cca_vdev_unlock_and_destroy(struct realm *realm, host_tdi->rmm_vdev = NULL; host_tdi->realm = NULL; } + +int cca_vdev_get_object_size(struct pci_dev *pdev, int type) +{ + long len; + struct cca_host_tdi *host_tdi; + struct cca_host_pf0_ep_dsc *pf0_ep_dsc; + struct pci_tsm *tsm = pdev->tsm; + struct cca_host_pdev_dsc *pdev_dsc; + + if (!tsm) + return -EINVAL; + + pdev_dsc = to_cca_pdev_dsc(tsm->dsm_dev); + pf0_ep_dsc = to_cca_pf0_ep_dsc(tsm->dsm_dev); + host_tdi = to_cca_host_tdi(pdev); + + guard(mutex)(&pdev_dsc->object_lock); + /* Determine the buffer that should be used */ + if (type == RHI_DA_OBJECT_INTERFACE_REPORT) { + if (!host_tdi->interface_report) + return -EINVAL; + len = host_tdi->interface_report->offset; + } else if (type == RHI_DA_OBJECT_MEASUREMENT) { + if (!host_tdi->measurements) + return -EINVAL; + len = host_tdi->measurements->offset; + } else if (type == RHI_DA_OBJECT_CERTIFICATE) { + if (!pf0_ep_dsc->cert_chain.cache) + return -EINVAL; + len = pf0_ep_dsc->cert_chain.cache->offset; + } else if (type == RHI_DA_OBJECT_VCA) { + if (!pf0_ep_dsc->vca) + return -EINVAL; + len = pf0_ep_dsc->vca->offset; + } else { + return -EINVAL; + } + + return len; +} + +int cca_vdev_read_cached_object(struct pci_dev *pdev, int type, + unsigned long offset, unsigned long max_len, + void __user *user_buf) +{ + void *buf; + unsigned long len; + struct cca_host_tdi *host_tdi; + struct cca_host_pf0_ep_dsc *pf0_ep_dsc; + struct pci_tsm *tsm = pdev->tsm; + struct cca_host_pdev_dsc *pdev_dsc; + + if (!tsm) + return -EINVAL; + + pdev_dsc = to_cca_pdev_dsc(tsm->dsm_dev); + pf0_ep_dsc = to_cca_pf0_ep_dsc(tsm->dsm_dev); + host_tdi = to_cca_host_tdi(pdev); + + guard(mutex)(&pdev_dsc->object_lock); + /* Determine the buffer that should be used */ + if (type == RHI_DA_OBJECT_INTERFACE_REPORT) { + if (!host_tdi->interface_report) + return -EINVAL; + len = host_tdi->interface_report->offset; + buf = host_tdi->interface_report->buf; + } else if (type == RHI_DA_OBJECT_MEASUREMENT) { + if (!host_tdi->measurements) + return -EINVAL; + len = host_tdi->measurements->offset; + buf = host_tdi->measurements->buf; + } else if (type == RHI_DA_OBJECT_CERTIFICATE) { + if (!pf0_ep_dsc->cert_chain.cache) + return -EINVAL; + len = pf0_ep_dsc->cert_chain.cache->offset; + buf = pf0_ep_dsc->cert_chain.cache->buf; + } else if (type == RHI_DA_OBJECT_VCA) { + if (!pf0_ep_dsc->vca) + return -EINVAL; + len = pf0_ep_dsc->vca->offset; + buf = pf0_ep_dsc->vca->buf; + } else { + return -EINVAL; + } + + /* Assume that the buffer is large enough for the whole report */ + if (max_len < len) + return -E2BIG; + + if (copy_to_user(user_buf, buf + offset, len)) + return -EIO; + + return len; +} diff --git a/drivers/virt/coco/arm-cca-host/rmi-da.h b/drivers/virt/coco/arm-cca-host/rmi-da.h index 97f7eaf1f779..4f1a61a5dcfa 100644 --- a/drivers/virt/coco/arm-cca-host/rmi-da.h +++ b/drivers/virt/coco/arm-cca-host/rmi-da.h @@ -242,5 +242,8 @@ int cca_pdev_purge_stream_key(struct pci_dev *pdev1, struct pci_dev *pdev2, unsigned long stream_handle); void cca_vdev_unlock_and_destroy(struct realm *realm, struct pci_dev *pdev, struct pci_dev *pf0_dev); +int cca_vdev_get_object_size(struct pci_dev *pdev, int type); +int cca_vdev_read_cached_object(struct pci_dev *pdev, int type, unsigned long offset, + unsigned long max_len, void __user *user_buf); #endif -- 2.43.0