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 7ECDF385507; Mon, 27 Apr 2026 08:55:06 +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=1777280106; cv=none; b=LlKSAvBaiPveEr1sCECVs8TRUcv28QE6fSrNVVC3zrnRd4jlnuinO3GWFxmxj3mqnS4/zdGP/dOCJ8kru0RUo0DmDV7nzqbUZ+hbrjFa8h4hoToYrWNVJU8dnol8fFjWE/l+C99HWTbwJIhdiDnzm0nNUh6gI4xjxf44fpDZ4hQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777280106; c=relaxed/simple; bh=LXV+r9kFhShkW3woqwoWMcFfbrEWeY/nBG9pHj7xGPI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WRhMLWiXnyd8X1bc+wG/HLogjSPJDnJwId5Oe6X5CV+N7xf8KYzMkwft6eAXQRyaq/aomH0odj27IXWdJwSU6l6ZG29d1nyMaI9Wt5FnOTribG35stdbMUjcfHinFG0WQOpARXtBW/7Zs6KUlZNCRPcUqK0+VKaFyMTAith5re4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UXIWP0Mr; 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="UXIWP0Mr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 271D0C2BCB9; Mon, 27 Apr 2026 08:54:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777280105; bh=LXV+r9kFhShkW3woqwoWMcFfbrEWeY/nBG9pHj7xGPI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UXIWP0MrHk6JikCbBUQDEWSNQOsPSsuy+SjfYK1FEkJy1Zgv6PHSzaT6uXtYkjcRa Uxp6Q2stfe7bFUo+Ikp4BZq5l5J8C51PNEWG2W5eDJU323JOfXYuue+xUTKY8anf5q OxeL4b3/Py+7LQRa0NcngMvuBdc/Oel4NYx/BUshwmEtgYJIempNJaIojt8rJma96w 818XAv8F7RyYmHUsPxqFqVuTDpTQKzlBcyY6A2JHnKO1w7Ma+ruU1pjmZMA6i5W6BR 3ycUKHmrv8fI/aoP4zfEoEBSgAWiyCCTd4L/jFt6J/zngSccLjCktUvPzTktQeaBCW bDSEFMk6ZUsJA== 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 11/16] coco: host: arm64: Fetch interface report via RMI Date: Mon, 27 Apr 2026 14:23:39 +0530 Message-ID: <20260427085344.941627-12-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> 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 Signed-off-by: Aneesh Kumar K.V (Arm) --- arch/arm64/include/asm/rmi_cmds.h | 12 ++++++ arch/arm64/include/uapi/asm/rmi-da.h | 3 ++ drivers/virt/coco/arm-cca-host/arm-cca.c | 4 ++ drivers/virt/coco/arm-cca-host/rmi-da.c | 54 +++++++++++++++++++++++- drivers/virt/coco/arm-cca-host/rmi-da.h | 1 + 5 files changed, 73 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/rmi_cmds.h b/arch/arm64/include/asm/rmi_cmds.h index aa7ef9f07517..b3c04029bb47 100644 --- a/arch/arm64/include/asm/rmi_cmds.h +++ b/arch/arm64/include/asm/rmi_cmds.h @@ -969,4 +969,16 @@ 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/uapi/asm/rmi-da.h b/arch/arm64/include/uapi/asm/rmi-da.h index 5ec3413dce94..8d36a4c59849 100644 --- a/arch/arm64/include/uapi/asm/rmi-da.h +++ b/arch/arm64/include/uapi/asm/rmi-da.h @@ -18,4 +18,7 @@ struct arm64_vdev_object_read_guest_req { }; #define __RHI_DA_OBJECT_READ 0x2 +/* No arguments to this guest request */ +#define __RHI_DA_VDEV_UPDATE_INTERFACE_REPORT 0x3 + #endif diff --git a/drivers/virt/coco/arm-cca-host/arm-cca.c b/drivers/virt/coco/arm-cca-host/arm-cca.c index 4bf1f1b394af..2955993d29ac 100644 --- a/drivers/virt/coco/arm-cca-host/arm-cca.c +++ b/drivers/virt/coco/arm-cca-host/arm-cca.c @@ -561,6 +561,10 @@ static ssize_t cca_tsm_guest_req(struct pci_tdi *tdi, enum pci_tsm_req_scope sco /* error */ return len; } + case __RHI_DA_VDEV_UPDATE_INTERFACE_REPORT: + { + return cca_vdev_update_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 63b20c8aef54..1862e4ff8cbb 100644 --- a/drivers/virt/coco/arm-cca-host/rmi-da.c +++ b/drivers/virt/coco/arm-cca-host/rmi-da.c @@ -1138,7 +1138,7 @@ 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; @@ -1257,3 +1257,55 @@ 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); + 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); + flush_work(&comm_work.work); + destroy_work_on_stack(&comm_work.work); + + if (comm_work.cache_size == 0) + return -ENXIO; + return 0; +} + +int cca_vdev_update_interface_report(struct pci_dev *pdev) +{ + phys_addr_t rmm_pdev_phys; + phys_addr_t rmm_vdev_phys; + struct cca_host_pdev_dsc *pdev_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); + + pdev_dsc = to_cca_pdev_dsc(pdev->tsm->dsm_dev); + rmm_pdev_phys = virt_to_phys(pdev_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 c1fc7c01943e..b114bf4d4202 100644 --- a/drivers/virt/coco/arm-cca-host/rmi-da.h +++ b/drivers/virt/coco/arm-cca-host/rmi-da.h @@ -248,5 +248,6 @@ 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_update_interface_report(struct pci_dev *pdev); #endif -- 2.43.0