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 532C73451B2; Thu, 12 Mar 2026 08:08:29 +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=1773302909; cv=none; b=JMhbP3EGeyRO+22S6mECPINGRBW9RZ/35wdZpO3pjgC7fZKyh4N1c6CAQiy3Sgj9R7dvYvPJHqM07yPtYVmXu91NE3eG71JhdIHnfHzjNticCxcHQbQFJMdNA50618HRtK53TRq0n5351nAV5NO/eSQ4JxDivfUo4YzMGtt85nw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773302909; c=relaxed/simple; bh=+yNnfpjqO4SRVmlPnho03o+dxHxLszjLp9xfVGhQhOo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=b//0InrsDU9ZmQgVHF87bMCllXcAAgYaPIZ7HMzd5UxiHe8VU7zsqoaUioaa6VYK/K4on9d3RnzlCsdePIMQ2PX3ddUa3e0dd5qaRDGFYP1Jk++Cjr96IOIeW+SAOXkcNsjWrQLiKUwLaPsJTgSI2Sz3s0buZ6z7PvNDpJRX+xo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BjT9GOYS; 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="BjT9GOYS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BD475C2BCAF; Thu, 12 Mar 2026 08:08:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773302908; bh=+yNnfpjqO4SRVmlPnho03o+dxHxLszjLp9xfVGhQhOo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BjT9GOYSQUtov9p25h5UWB6THM0IIH4vgwGaDIiwlYv8OSfzqofaei/rkQS+DCgvf FNq+MJGUAhTTcHeAk6o4Rj0/fKcTNO7n0MmhWq97OAGY6Quzfhc/BXJBnLwcrZQmAD 3NfbKEbUtJ8xmEGycOYJc7ADXVF/m9yHizeJlR8wEQnSoqBsbMUHXJh0aGjzHbuM4C L1RHFEBIICvxPuwApDqQiSE2e16jRxneNtsUHrTE7So6ef8eUbuo+QSxac1JAgemmI SJ4ecE1LSqTPQbSlSzqjm69owd1Gp5vIRSkPMzSExq60Tw7J587nH6cDsraTRNEBoe wF7kQB5WmyrUw== From: "Aneesh Kumar K.V (Arm)" To: linux-coco@lists.linux.dev, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, "Aneesh Kumar K.V (Arm)" , Marc Zyngier , Catalin Marinas , Will Deacon , Jonathan Cameron , Jason Gunthorpe , Dan Williams , Alexey Kardashevskiy , Samuel Ortiz , Xu Yilun , Suzuki K Poulose , Steven Price Subject: [RFC PATCH v3 06/12] coco: host: arm64: Fetch interface report via RMI Date: Thu, 12 Mar 2026 13:37:37 +0530 Message-ID: <20260312080743.3487326-7-aneesh.kumar@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260312080743.3487326-1-aneesh.kumar@kernel.org> References: <20260312080743.3487326-1-aneesh.kumar@kernel.org> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit - define `__RHI_DA_VDEV_GET_INTERFACE_REPORT` for guest requests and expose the RMI SMC ID/wrapper for `RMI_VDEV_GET_INTERFACE_REPORT` - teach the CCA host driver to handle the new guest request by fetching the report from RMM using `rmi_vdev_get_interface_report()` and refreshing the cached buffer - add a helper that submits a DOE work to pull the latest report into the cache This lets guests request up-to-date interface reports via RHI Cc: Marc Zyngier Cc: Catalin Marinas Cc: Will Deacon Cc: Jonathan Cameron Cc: Jason Gunthorpe Cc: Dan Williams Cc: Alexey Kardashevskiy Cc: Samuel Ortiz Cc: Xu Yilun Cc: Suzuki K Poulose Cc: Steven Price Signed-off-by: Aneesh Kumar K.V (Arm) --- arch/arm64/include/asm/rhi.h | 1 + arch/arm64/include/asm/rmi_cmds.h | 12 ++++++ arch/arm64/include/asm/rmi_smc.h | 1 + drivers/virt/coco/arm-cca-host/arm-cca.c | 4 ++ drivers/virt/coco/arm-cca-host/rmi-da.c | 55 +++++++++++++++++++++++- drivers/virt/coco/arm-cca-host/rmi-da.h | 1 + 6 files changed, 73 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/rhi.h b/arch/arm64/include/asm/rhi.h index 3c84fedba4ab..edb23614cdeb 100644 --- a/arch/arm64/include/asm/rhi.h +++ b/arch/arm64/include/asm/rhi.h @@ -82,5 +82,6 @@ enum rhi_tdi_state { /* guest request operation nr */ #define __RHI_DA_OBJECT_SIZE 0x1 #define __RHI_DA_OBJECT_READ 0x2 +#define __RHI_DA_VDEV_GET_INTERFACE_REPORT 0x3 #endif diff --git a/arch/arm64/include/asm/rmi_cmds.h b/arch/arm64/include/asm/rmi_cmds.h index 5964549aca23..ea9d4ec21e0e 100644 --- a/arch/arm64/include/asm/rmi_cmds.h +++ b/arch/arm64/include/asm/rmi_cmds.h @@ -661,4 +661,16 @@ static inline unsigned long rmi_vdev_destroy(unsigned long rd, return res.a0; } +static inline unsigned long rmi_vdev_get_interface_report(unsigned long rd, + unsigned long pdev_phys, + unsigned long vdev_phys) +{ + struct arm_smccc_res res; + + arm_smccc_1_1_invoke(SMC_RMI_VDEV_GET_INTERFACE_REPORT, + rd, pdev_phys, vdev_phys, &res); + + return res.a0; +} + #endif /* __ASM_RMI_CMDS_H */ diff --git a/arch/arm64/include/asm/rmi_smc.h b/arch/arm64/include/asm/rmi_smc.h index 95ddbc6dd1e0..b3239f51de22 100644 --- a/arch/arm64/include/asm/rmi_smc.h +++ b/arch/arm64/include/asm/rmi_smc.h @@ -60,6 +60,7 @@ #define SMC_RMI_VDEV_DESTROY SMC_RMI_CALL(0x0188) #define SMC_RMI_VDEV_GET_STATE SMC_RMI_CALL(0x0189) #define SMC_RMI_VDEV_UNLOCK SMC_RMI_CALL(0x018A) +#define SMC_RMI_VDEV_GET_INTERFACE_REPORT SMC_RMI_CALL(0x01D0) #define SMC_RMI_VDEV_LOCK SMC_RMI_CALL(0x01D2) diff --git a/drivers/virt/coco/arm-cca-host/arm-cca.c b/drivers/virt/coco/arm-cca-host/arm-cca.c index 8678acd84d7d..de3c239345a8 100644 --- a/drivers/virt/coco/arm-cca-host/arm-cca.c +++ b/drivers/virt/coco/arm-cca-host/arm-cca.c @@ -342,6 +342,10 @@ static ssize_t cca_tsm_guest_req(struct pci_tdi *tdi, enum pci_tsm_req_scope sco /* error */ return len; } + case __RHI_DA_VDEV_GET_INTERFACE_REPORT: + { + return cca_vdev_get_interface_report(pdev); + } default: return -EINVAL; } diff --git a/drivers/virt/coco/arm-cca-host/rmi-da.c b/drivers/virt/coco/arm-cca-host/rmi-da.c index 123cda44535c..48a18905bb55 100644 --- a/drivers/virt/coco/arm-cca-host/rmi-da.c +++ b/drivers/virt/coco/arm-cca-host/rmi-da.c @@ -839,7 +839,7 @@ void cca_vdev_unlock_and_destroy(struct realm *realm, host_tdi->realm = NULL; } -static void __maybe_unused vdev_fetch_object_workfn(struct work_struct *work) +static void vdev_fetch_object_workfn(struct work_struct *work) { int state; struct pci_tsm *tsm; @@ -956,3 +956,56 @@ int cca_vdev_read_cached_object(struct pci_dev *pdev, int type, return len; } + +static int vdev_update_interface_report_cache(struct pci_dev *pdev) +{ + struct dev_comm_work comm_work; + struct cca_host_tdi *host_tdi = to_cca_host_tdi(pdev); + struct cca_host_comm_data *comm_data = to_cca_comm_data(pdev); + + INIT_WORK_ONSTACK(&comm_work.work, vdev_fetch_object_workfn); + init_completion(&comm_work.complete); + comm_work.tsm = pdev->tsm; + if (host_tdi->interface_report) { + comm_work.cache_buf = host_tdi->interface_report->buf; + comm_work.cache_offset = &host_tdi->interface_report->offset; + comm_work.cache_size = host_tdi->interface_report->size; + } else { + comm_work.cache_buf = NULL; + comm_work.cache_offset = NULL; + comm_work.cache_size = 0; + } + + queue_work(comm_data->work_queue, &comm_work.work); + wait_for_completion(&comm_work.complete); + destroy_work_on_stack(&comm_work.work); + + if (comm_work.cache_size == 0) + return -ENXIO; + return 0; +} + +int cca_vdev_get_interface_report(struct pci_dev *pdev) +{ + phys_addr_t rmm_pdev_phys; + phys_addr_t rmm_vdev_phys; + struct cca_host_pf0_dsc *pf0_dsc; + struct cca_host_tdi *host_tdi; + struct realm *realm; + phys_addr_t rd_phys; + + host_tdi = to_cca_host_tdi(pdev); + rmm_vdev_phys = virt_to_phys(host_tdi->rmm_vdev); + realm = &host_tdi->tdi.kvm->arch.realm; + rd_phys = virt_to_phys(realm->rd); + + pf0_dsc = to_cca_pf0_dsc(pdev->tsm->dsm_dev); + rmm_pdev_phys = virt_to_phys(pf0_dsc->rmm_pdev); + + if (rmi_vdev_get_interface_report(rd_phys, + rmm_pdev_phys, rmm_vdev_phys)) + return -ENXIO; + + /* get and update the interface report cache. */ + return vdev_update_interface_report_cache(pdev); +} diff --git a/drivers/virt/coco/arm-cca-host/rmi-da.h b/drivers/virt/coco/arm-cca-host/rmi-da.h index c4f31986389c..662cedd23c42 100644 --- a/drivers/virt/coco/arm-cca-host/rmi-da.h +++ b/drivers/virt/coco/arm-cca-host/rmi-da.h @@ -150,4 +150,5 @@ void cca_vdev_unlock_and_destroy(struct realm *realm, struct pci_dev *pdev, 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); +int cca_vdev_get_interface_report(struct pci_dev *pdev); #endif -- 2.43.0