From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.9]) (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 2909C2EC57C; Fri, 8 May 2026 17:30:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.9 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778261420; cv=none; b=naAES7nVdwFPg55LVZS7dMyO535gNKFYgk9zbgS9hmu1VGhZYNIlAKCZYJI8mcUrG6O/YFqKTQaIU46ptEQcWWii3f6gknXh/mbxop6MDW7NceEkyTj0QfaW1gXxVWbktRaLXgapCNCgo3PGrltu2MqgwTju1hze+/4k/j6e6pc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778261420; c=relaxed/simple; bh=6RBLVHT763iWCAiYJpYG5D13YdW8r7qO5LV7VD/wqLs=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=bIshNKoKpFqZVrs9Da+/UDERzs+IoPY25REhkyaPDUrzWDi3anWiNV5IXCjeBJaVAIfG6orPOPOGdi+37APZwtJKSb8ni0RXyOhED1YMYByTwOKH/h12HrzIJWF4Bm1hoGpHxKqbxVstjRF2l9BjRJNx/3R7p08ehJQuU+XJCGI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=TIvJp0Xq; arc=none smtp.client-ip=192.198.163.9 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="TIvJp0Xq" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1778261418; x=1809797418; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=6RBLVHT763iWCAiYJpYG5D13YdW8r7qO5LV7VD/wqLs=; b=TIvJp0XqSysJupoJr0xG2Q7UB8LgU8mnArJZ3G9JPlqWwZyEmMj+56G/ NP+7w30B+sG+SBIPymzmeCmI5INAhI22pG+NGE7caiFYjyAinmnv9ZPIs Cu4PS1MgZnW99WC+/3x8S5p45R/ABekWXPcrT13PyL6aRa55gdb/7h9ME xmmPZPFriNkAE2oXna18cGz4FJUTSb+lYhlTX0qsn4yhN3Dum9lcn6jvm /1ld7SqnyCcXqAnHpJi1kWT/P1RmZ4OQo1rjnNFb75D810NDg5VpL28OM fXMPF6htWZSjIqrjCK9v++GLHH+oDlGLKsuNzyUSRdZd+Dg5nM9cbCNvb g==; X-CSE-ConnectionGUID: QPwDmPdzSNS1PGBTUE+Qkg== X-CSE-MsgGUID: gY9rus7SSCu2sXrTlO6aqA== X-IronPort-AV: E=McAfee;i="6800,10657,11780"; a="89938811" X-IronPort-AV: E=Sophos;i="6.23,223,1770624000"; d="scan'208";a="89938811" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by fmvoesa103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 May 2026 10:30:17 -0700 X-CSE-ConnectionGUID: o76zTJr+Ra+d+4BhWnyHLw== X-CSE-MsgGUID: 7OjNYW/5Q4SD0uBTnc3hwA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,223,1770624000"; d="scan'208";a="235841029" Received: from kwachows-mobl.ger.corp.intel.com (HELO [10.246.20.129]) ([10.246.20.129]) by orviesa006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 May 2026 10:30:13 -0700 Message-ID: <17c27a42-a1ec-4b7a-b6c7-ad6fb2d50df1@linux.intel.com> Date: Fri, 8 May 2026 19:30:10 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] accel/ivpu: Reject PRIME export of userptr BOs To: Ziyi Guo , maciej.falkowski@linux.intel.com Cc: ogabbay@kernel.org, sumit.semwal@linaro.org, christian.koenig@amd.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, Ziyi Guo References: <20260508162856.1131843-1-n7l8m4@u.northwestern.edu> Content-Language: en-US From: Karol Wachowski Organization: Intel Technology Poland sp. z o.o. - ul. Slowackiego 173, 80-298 Gdansk - KRS 101882 - NIP 957-07-52-316 In-Reply-To: <20260508162856.1131843-1-n7l8m4@u.northwestern.edu> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 5/8/2026 6:28 PM, Ziyi Guo wrote: > Userptr BOs wrap pinned user pages in a private dma-buf solely for > internal use by the NPU driver. Allowing userspace to re-export such a > BO via DRM_IOCTL_PRIME_HANDLE_TO_FD would expose those pages to other > drivers through an interface that was never intended to be shared. > > Override the driver's prime_handle_to_fd callback to detect dma-bufs > backed by ivpu_gem_userptr_dmabuf_ops and reject the export with > -EINVAL. > > Signed-off-by: Ziyi Guo Hi, Thank you for submission. Actually very similar (with the same intent) patch was already applied: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/diff/drivers/accel/ivpu/ivpu_drv.c?id=51d24842acb9b8d643046c71314cc3d7a846a3cf Kind regards, Karol > --- > drivers/accel/ivpu/ivpu_drv.c | 1 + > drivers/accel/ivpu/ivpu_gem.c | 28 +++++++++++++++++++++++++++ > drivers/accel/ivpu/ivpu_gem.h | 3 +++ > drivers/accel/ivpu/ivpu_gem_userptr.c | 5 +++++ > 4 files changed, 37 insertions(+) > > diff --git a/drivers/accel/ivpu/ivpu_drv.c b/drivers/accel/ivpu/ivpu_drv.c > index 2801378e3e19..086d4c769b33 100644 > --- a/drivers/accel/ivpu/ivpu_drv.c > +++ b/drivers/accel/ivpu/ivpu_drv.c > @@ -545,6 +545,7 @@ static const struct drm_driver driver = { > > .gem_create_object = ivpu_gem_create_object, > .gem_prime_import = ivpu_gem_prime_import, > + .prime_handle_to_fd = ivpu_gem_prime_handle_to_fd, > > .ioctls = ivpu_drm_ioctls, > .num_ioctls = ARRAY_SIZE(ivpu_drm_ioctls), > diff --git a/drivers/accel/ivpu/ivpu_gem.c b/drivers/accel/ivpu/ivpu_gem.c > index 4f2005a8d496..82079f372b39 100644 > --- a/drivers/accel/ivpu/ivpu_gem.c > +++ b/drivers/accel/ivpu/ivpu_gem.c > @@ -12,6 +12,7 @@ > #include > #include > #include > +#include > #include > > #include "ivpu_drv.h" > @@ -249,6 +250,33 @@ struct drm_gem_object *ivpu_gem_prime_import(struct drm_device *dev, > return ERR_PTR(ret); > } > > +int ivpu_gem_prime_handle_to_fd(struct drm_device *dev, struct drm_file *file_priv, > + u32 handle, u32 flags, int *prime_fd) > +{ > + struct ivpu_device *vdev = to_ivpu_device(dev); > + struct dma_buf *dmabuf; > + int fd; > + > + dmabuf = drm_gem_prime_handle_to_dmabuf(dev, file_priv, handle, flags); > + if (IS_ERR(dmabuf)) > + return PTR_ERR(dmabuf); > + > + if (ivpu_gem_is_userptr_dma_buf(dmabuf)) { > + ivpu_dbg(vdev, IOCTL, "Exporting userptr BO is not allowed\n"); > + dma_buf_put(dmabuf); > + return -EINVAL; > + } > + > + fd = dma_buf_fd(dmabuf, flags); > + if (fd < 0) { > + dma_buf_put(dmabuf); > + return fd; > + } > + > + *prime_fd = fd; > + return 0; > +} > + > static struct ivpu_bo *ivpu_bo_alloc(struct ivpu_device *vdev, u64 size, u32 flags) > { > struct drm_gem_shmem_object *shmem; > diff --git a/drivers/accel/ivpu/ivpu_gem.h b/drivers/accel/ivpu/ivpu_gem.h > index 0c3350f22b55..bfd15ce02354 100644 > --- a/drivers/accel/ivpu/ivpu_gem.h > +++ b/drivers/accel/ivpu/ivpu_gem.h > @@ -29,6 +29,9 @@ void ivpu_bo_unbind_all_bos_from_context(struct ivpu_device *vdev, struct ivpu_m > > struct drm_gem_object *ivpu_gem_create_object(struct drm_device *dev, size_t size); > struct drm_gem_object *ivpu_gem_prime_import(struct drm_device *dev, struct dma_buf *dma_buf); > +int ivpu_gem_prime_handle_to_fd(struct drm_device *dev, struct drm_file *file_priv, > + u32 handle, u32 flags, int *prime_fd); > +bool ivpu_gem_is_userptr_dma_buf(struct dma_buf *dma_buf); > struct ivpu_bo *ivpu_bo_create(struct ivpu_device *vdev, struct ivpu_mmu_context *ctx, > struct ivpu_addr_range *range, u64 size, u32 flags); > struct ivpu_bo *ivpu_bo_create_runtime(struct ivpu_device *vdev, u64 addr, u64 size, u32 flags); > diff --git a/drivers/accel/ivpu/ivpu_gem_userptr.c b/drivers/accel/ivpu/ivpu_gem_userptr.c > index 7cbf3a4cdc73..45eabea5961e 100644 > --- a/drivers/accel/ivpu/ivpu_gem_userptr.c > +++ b/drivers/accel/ivpu/ivpu_gem_userptr.c > @@ -61,6 +61,11 @@ static const struct dma_buf_ops ivpu_gem_userptr_dmabuf_ops = { > .release = ivpu_gem_userptr_dmabuf_release, > }; > > +bool ivpu_gem_is_userptr_dma_buf(struct dma_buf *dma_buf) > +{ > + return dma_buf->ops == &ivpu_gem_userptr_dmabuf_ops; > +} > + > static struct dma_buf * > ivpu_create_userptr_dmabuf(struct ivpu_device *vdev, void __user *user_ptr, > size_t size, uint32_t flags)