From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 12E352E339C for ; Thu, 21 Aug 2025 06:46:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755758818; cv=none; b=quiInpIs4tqLKKRgnVSnNWCbmrO0tO8T1wVb/TNLzuqK/83NAHIZUrN5U50V461zNXq8tUlN8F381maESRGhxkvdBGoR/CGZDUPnwzPQWZB/llE5kj+Le4nbnjMnd0DQdqtLPUxw8OyWj5AoIExzCrwq7hPJmQD4Ovgbi0fbIGI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755758818; c=relaxed/simple; bh=+6yvn0YKKNDiUHlCWquUONeWP3JYOVSD0tnUrZBOAb0=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=dAG6yXMPmT7xZ8e2nc0jqRcyKo6PUViPOoLBpp6XQw3cZexQu95RQvAI7wTygFFXXoc8kDOxZDcMiaJbg0W/vJ7AftCDbDTo8xBqYHY9xtPvF4I19te/ZJXRtUjKrrJxyt8Jf0Yt8Xu379oFPAe12FGhjI9t2FiI59gTnrxnbKU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=iXeTNRi/; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="iXeTNRi/" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1755758815; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=1LNt7Lxc+ABGXS8RVj1hI9eGxGKQG1KQTnyDB4zLACI=; b=iXeTNRi/u+oPCv1LweV5jeoE4hDrw+1fi7qDsJ7EXtz7qxWowGRBOZ/OuyihelHweNlFVM 6ZUtLBXrTz9AwtWO5EatlxjZ6lEuaJy5WwVXgQQUiXBvJqBfl7D5ZzXhY/wlFlEOC4PW05 s4fJIBGIToFsaCY0FOMu/KeD1dCn5x0= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-10-d-dkKdJSMwSeqqROXS1tPw-1; Thu, 21 Aug 2025 02:46:52 -0400 X-MC-Unique: d-dkKdJSMwSeqqROXS1tPw-1 X-Mimecast-MFC-AGG-ID: d-dkKdJSMwSeqqROXS1tPw_1755758811 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 7AAB71956088; Thu, 21 Aug 2025 06:46:50 +0000 (UTC) Received: from localhost.localdomain (unknown [10.72.112.130]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 7766A19560B0; Thu, 21 Aug 2025 06:46:45 +0000 (UTC) From: Jason Wang To: mst@redhat.com, jasowang@redhat.com, xuanzhuo@linux.alibaba.com, eperezma@redhat.com Cc: virtualization@lists.linux.dev, linux-kernel@vger.kernel.org, hch@infradead.org Subject: [PATCH V6 0/9] Refine virtio mapping API Date: Thu, 21 Aug 2025 14:46:32 +0800 Message-ID: <20250821064641.5025-1-jasowang@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Hi all: Virtio used to be coupled with DMA API. This works fine for the device that do real DMA but not the others. For example, VDUSE nees to craft with DMA API in order to let the virtio-vdpa driver to work. This series tries to solve this issue by introducing the mapping API in the virtio core. So transport like vDPA can implement their own mapping logic without the need to hack with DMA API. The mapping API are abstracted with a new map operations in order to be re-used by transprot or device. So device like VDUSE can implement its own mapping loigc. For device that uses DMA (for example PCI device), the virtio core will still call DMA API directly without the need of implementing map ops per device/transport. Please review. Changes since V5: - Rename mapping_token to virtio_map - Do not use opaque void * pointer, just use a forward decalration of vduse_iova_domain - Remove unused variable and typo fixes Changes since V4: - Rename map_token to mapping_token - Introduce a union container for opaque token as well as the DMA device so we won't lose the type safety - Do not try to set DMA mask for VDUSE device - Introduce a new mapper_error op for API completeness Changes since V3: - Fix build error of PDS vDPA driver Changes since V2: - Drop VDUSE dependenct for HAS_DMA and ARCH_HAS_DMA_OPS Changes since V1: - Fix build error of mlx5_vdpa driver Jason Wang (9): virtio_ring: constify virtqueue pointer for DMA helpers virtio_ring: switch to use dma_{map|unmap}_page() virtio: rename dma helpers virtio: introduce virtio_map container union virtio_ring: rename dma_handle to map_handle virtio: introduce map ops in virtio core vdpa: support virtio_map vdpa: introduce map ops vduse: switch to use virtio map API instead of DMA API drivers/net/virtio_net.c | 28 +- drivers/vdpa/Kconfig | 8 +- drivers/vdpa/alibaba/eni_vdpa.c | 5 +- drivers/vdpa/ifcvf/ifcvf_main.c | 5 +- drivers/vdpa/mlx5/core/mr.c | 4 +- drivers/vdpa/mlx5/net/mlx5_vnet.c | 15 +- drivers/vdpa/octeon_ep/octep_vdpa_main.c | 6 +- drivers/vdpa/pds/vdpa_dev.c | 5 +- drivers/vdpa/solidrun/snet_main.c | 8 +- drivers/vdpa/vdpa.c | 5 +- drivers/vdpa/vdpa_sim/vdpa_sim.c | 4 +- drivers/vdpa/vdpa_user/iova_domain.c | 2 +- drivers/vdpa/vdpa_user/iova_domain.h | 2 +- drivers/vdpa/vdpa_user/vduse_dev.c | 79 ++-- drivers/vdpa/virtio_pci/vp_vdpa.c | 5 +- drivers/vhost/vdpa.c | 6 +- drivers/virtio/virtio_ring.c | 459 ++++++++++++++--------- drivers/virtio/virtio_vdpa.c | 20 +- include/linux/vdpa.h | 25 +- include/linux/virtio.h | 46 ++- include/linux/virtio_config.h | 72 ++++ include/linux/virtio_ring.h | 7 +- 22 files changed, 531 insertions(+), 285 deletions(-) -- 2.31.1