From patchwork Fri Feb 23 08:27:18 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 13568671 Received: from out30-110.freemail.mail.aliyun.com (out30-110.freemail.mail.aliyun.com [115.124.30.110]) (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 066733C47E; Fri, 23 Feb 2024 08:27:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.110 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708676870; cv=none; b=BDRZoKwXONtkiPPDKNYSiOtVG8yvgetewIy8bWSWt1Wx1fw9vrdS0PkJfUXEWW7kD7Jf9lg3VF2z4oYfWpznmVlyNUfCASOwLRua6EUnZSeDmVpbdf8j8rFzyJdbm0taQ6+nFFpJI24oUio6pYlAUxABOva0dav2HnyCnlafPE0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708676870; c=relaxed/simple; bh=edTitATIxyHSEiW2oo+NUoQMmO0I0Hk4LOfcTXSkfBM=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=sNkQylK76a/obuGi39CopEXZpyuMt+lLznHTxBsccvxCctyltT+oCan/uCBbfN6mdZ4r1tjR+6y6aiFTdH7ZHA2DqMpyKGQrmc1ZNMjfo/fj4WiJETMP0P4r+rMaO47TGeSN+h+Ke+iIvcITf/lWMb7oUdUMF425/xRFOHKAlow= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=bN+bZmwF; arc=none smtp.client-ip=115.124.30.110 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="bN+bZmwF" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1708676866; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=INlx7TRy5b87EvD4imFkjgGo8erFnsWbzmY9PKIXOKQ=; b=bN+bZmwFfPCACNw/F7bD+xP1D03718Rd00fWSJsX19zyR4s4ZXD2Pt/U84I0Rqzen0yJCwNj+vKXhl19cR9f5AWuGv6CrNXb9dR54XkNdS5c/WjfLWyEebGxmKk4M7lZlVnKy2siq7VoqSZvPQ9IZ/qpL17ko2rocf0TBdjaido= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R151e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045170;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=35;SR=0;TI=SMTPD_---0W13mV24_1708676864; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0W13mV24_1708676864) by smtp.aliyun-inc.com; Fri, 23 Feb 2024 16:27:44 +0800 From: Xuan Zhuo To: virtualization@lists.linux.dev Cc: Richard Weinberger , Anton Ivanov , Johannes Berg , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Hans de Goede , =?utf-8?q?Ilpo_J=C3=A4rvinen?= , Vadim Pasternak , Bjorn Andersson , Mathieu Poirier , Cornelia Huck , Halil Pasic , Eric Farman , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , linux-um@lists.infradead.org, netdev@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH vhost v2 11/19] virtio: find_vqs: add new parameter premapped Date: Fri, 23 Feb 2024 16:27:18 +0800 Message-Id: <20240223082726.52915-12-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20240223082726.52915-1-xuanzhuo@linux.alibaba.com> References: <20240223082726.52915-1-xuanzhuo@linux.alibaba.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Git-Hash: 510995f33855 If the premapped mode is enabled, the dma array(struct vring_desc_dma) of virtio core will not be allocated. That is judged when find_vqs() is called. To avoid allocating dma array in find_vqs() and releasing it immediately by virtqueue_set_dma_premapped(). This patch introduces a new parameter to find_vqs(). Then we can judge should we allocate the dma array(struct vring_desc_dma) or not inside find_vqs(). The driver must check the premapped mode of every vq after find_vqs(). Signed-off-by: Xuan Zhuo --- drivers/virtio/virtio_ring.c | 4 ++-- include/linux/virtio_config.h | 1 + 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index bbd79fd52885..dade5c130329 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -2145,7 +2145,7 @@ static struct virtqueue *vring_create_virtqueue_packed(struct virtio_device *vde vq->packed_ring = true; vq->dma_dev = dma_dev; vq->use_dma_api = vring_use_dma_api(vdev); - vq->premapped = false; + vq->premapped = vq->use_dma_api && cfg_vq_get(cfg, premapped); vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) && !cfg_vq_get(cfg, ctx); @@ -2687,7 +2687,7 @@ static struct virtqueue *__vring_new_virtqueue(struct virtio_device *vdev, #endif vq->dma_dev = tp_cfg->dma_dev; vq->use_dma_api = vring_use_dma_api(vdev); - vq->premapped = false; + vq->premapped = vq->use_dma_api && cfg_vq_get(cfg, premapped); vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) && !cfg_vq_get(cfg, ctx); diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index d47188303d34..f1f62e57f395 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -107,6 +107,7 @@ struct virtio_vq_config { vq_callback_t **callbacks; const char **names; const bool *ctx; + const bool *premapped; struct irq_affinity *desc; };