From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on archive.lwn.net X-Spam-Level: X-Spam-Status: No, score=-5.8 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI,SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.2 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by archive.lwn.net (Postfix) with ESMTP id 066A27D2F0 for ; Tue, 30 Jul 2019 12:24:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729542AbfG3MYm (ORCPT ); Tue, 30 Jul 2019 08:24:42 -0400 Received: from mail-pg1-f193.google.com ([209.85.215.193]:37078 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726717AbfG3MYm (ORCPT ); Tue, 30 Jul 2019 08:24:42 -0400 Received: by mail-pg1-f193.google.com with SMTP id i70so19244232pgd.4 for ; Tue, 30 Jul 2019 05:24:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=F6RVSFR3EtlCJ6lvWs5T4vKHtTJAwPryiatLZ1M1aSY=; b=tfILgsUTF754qwTkDQPJD0rCNoaw5Uefc9p9gu+bUyOB285QrfyyfBMXVCuakpWXxU HICwYDIoYTjs/+ornlvVNUoij4mg9ij8bxODX+c7q02mHaK7IrzMH1R7ecmTkMo4+2xO Us9rLCt7owepUui89bfkEE/+tfrGjWsmuEK7kWBlWuXdpLhbvxXU6dLLp7egHq3QfEOx EAnFbfA73EDc7EvI/7xV2L+LruWbM8T/aZwxfA/Fok9dNyUsOb1nZjkFl2ZhnvrgF20f tcRKcSqCuXR5PmdwOUIpurnXSTsuhM16BUhSnW79IuqvzINcCDhZiAimeJCJ/3aEVT/+ Skzg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=F6RVSFR3EtlCJ6lvWs5T4vKHtTJAwPryiatLZ1M1aSY=; b=C/dF+tjDIbpZRKEyR+sb5GzJZ1F1I5+iVkHgVXDb7xYuXZp0i3d+ej0cvabdNL8GjL p6Xw5gRHe5nOztCFWp9kCqq2+DLAuPgMwHvpE1T/6hds64oPjXQRjX5o32inflBp8t6j HTpuDMLu+t+nQD13IfSSI1IdmQEBrMFBPG1Sk2JilCyCeROgjY1o7sOd0Dve7Sf2OLZ9 irJIbn99rtwVIqNRkj2fcoXzje2sAysgOJ+9PTc0yM+ftp8QTAR0ogCsKjgmICWTIkeE fqvq2hX8mNIw8A9d0IbJo0sDZhJKH0KGjTsDFbY5QJHgd3MOL1EB3yZbio3sBiuqMTw1 B0yg== X-Gm-Message-State: APjAAAWfrE1HnQ0R9RiYWPn1WTqqQ8XO538HC2Sal+Y4CjwuoKEzTtlX QmOuSqxNVDbh63qwJD6bLIUT5Q== X-Google-Smtp-Source: APXvYqxOXWjfS6W6Wq7C2Wm2EcZsROERy2icoey7lDKRVXENBtDjIep6/+XJLEKlNdfJ39CZmoJ1DQ== X-Received: by 2002:a63:d04e:: with SMTP id s14mr103689463pgi.189.1564489481707; Tue, 30 Jul 2019 05:24:41 -0700 (PDT) Received: from localhost.localdomain ([45.114.72.197]) by smtp.gmail.com with ESMTPSA id v8sm54895462pgs.82.2019.07.30.05.24.34 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 30 Jul 2019 05:24:40 -0700 (PDT) From: Sumit Garg To: keyrings@vger.kernel.org, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org Cc: jens.wiklander@linaro.org, corbet@lwn.net, dhowells@redhat.com, jejb@linux.ibm.com, jarkko.sakkinen@linux.intel.com, zohar@linux.ibm.com, jmorris@namei.org, serge@hallyn.com, casey@schaufler-ca.com, ard.biesheuvel@linaro.org, daniel.thompson@linaro.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, tee-dev@lists.linaro.org, Sumit Garg Subject: [RFC v2 2/6] tee: enable support to register kernel memory Date: Tue, 30 Jul 2019 17:53:36 +0530 Message-Id: <1564489420-677-3-git-send-email-sumit.garg@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1564489420-677-1-git-send-email-sumit.garg@linaro.org> References: <1564489420-677-1-git-send-email-sumit.garg@linaro.org> Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org Enable support to register kernel memory reference with TEE. This change will allow TEE bus drivers to register memory references. Signed-off-by: Sumit Garg Reviewed-by: Jarkko Sakkinen Reviewed-by: Jens Wiklander --- drivers/tee/tee_shm.c | 16 ++++++++++++++-- include/linux/tee_drv.h | 1 + 2 files changed, 15 insertions(+), 2 deletions(-) diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c index 2da026f..5c69b89 100644 --- a/drivers/tee/tee_shm.c +++ b/drivers/tee/tee_shm.c @@ -9,6 +9,7 @@ #include #include #include +#include #include "tee_private.h" static void tee_shm_release(struct tee_shm *shm) @@ -224,13 +225,14 @@ struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr, { struct tee_device *teedev = ctx->teedev; const u32 req_flags = TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED; + const u32 req_ker_flags = TEE_SHM_DMA_BUF | TEE_SHM_KERNEL_MAPPED; struct tee_shm *shm; void *ret; int rc; int num_pages; unsigned long start; - if (flags != req_flags) + if (flags != req_flags && flags != req_ker_flags) return ERR_PTR(-ENOTSUPP); if (!tee_device_get(teedev)) @@ -264,7 +266,17 @@ struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr, goto err; } - rc = get_user_pages_fast(start, num_pages, FOLL_WRITE, shm->pages); + if (flags & TEE_SHM_USER_MAPPED) { + rc = get_user_pages_fast(start, num_pages, FOLL_WRITE, + shm->pages); + } else { + const struct kvec kiov = { + .iov_base = (void *)start, + .iov_len = PAGE_SIZE + }; + + rc = get_kernel_pages(&kiov, num_pages, 0, shm->pages); + } if (rc > 0) shm->num_pages = rc; if (rc != num_pages) { diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h index 7a03f68..dedf8fa 100644 --- a/include/linux/tee_drv.h +++ b/include/linux/tee_drv.h @@ -26,6 +26,7 @@ #define TEE_SHM_REGISTER BIT(3) /* Memory registered in secure world */ #define TEE_SHM_USER_MAPPED BIT(4) /* Memory mapped in user space */ #define TEE_SHM_POOL BIT(5) /* Memory allocated from pool */ +#define TEE_SHM_KERNEL_MAPPED BIT(6) /* Memory mapped in kernel space */ struct device; struct tee_device; -- 2.7.4