From patchwork Fri Apr 24 10:04:18 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhu, Lingshan" X-Patchwork-Id: 11507421 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CFCEF1575 for ; Fri, 24 Apr 2020 10:07:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B8D2A2087E for ; Fri, 24 Apr 2020 10:07:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726876AbgDXKHj (ORCPT ); Fri, 24 Apr 2020 06:07:39 -0400 Received: from mga03.intel.com ([134.134.136.65]:53054 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726820AbgDXKHi (ORCPT ); Fri, 24 Apr 2020 06:07:38 -0400 IronPort-SDR: 3QRZn8TxDp9DC5PVJ2C/qmUf99k0VN7+bG99WQ/7gtLo+6EEoR+K3E3q70LBhJ9Hg/lOrXNNCm Jqyk32fPdC/Q== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Apr 2020 03:07:37 -0700 IronPort-SDR: ZUC3A8b3zI0M/td+Xxx0JTIdbdiYd9Jibxh6unfcbZhZLr1F2OykoIohhNPg0q5Zccu27FFXkx VWKaScT2L59w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,311,1583222400"; d="scan'208";a="280755918" Received: from unknown (HELO localhost.localdomain.bj.intel.com) ([10.240.193.79]) by fmsmga004.fm.intel.com with ESMTP; 24 Apr 2020 03:07:35 -0700 From: Zhu Lingshan To: mst@redhat.com, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, jasowang@redhat.com Cc: lulu@redhat.com, dan.daly@intel.com, cunming.liang@intel.com, Zhu Lingshan Subject: [PATCH 1/2] vdpa: Support config interrupt in vhost_vdpa Date: Fri, 24 Apr 2020 18:04:18 +0800 Message-Id: <1587722659-1300-2-git-send-email-lingshan.zhu@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1587722659-1300-1-git-send-email-lingshan.zhu@intel.com> References: <1587722659-1300-1-git-send-email-lingshan.zhu@intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This commit implements config interrupt support in vhost_vdpa layer. Signed-off-by: Zhu Lingshan Signed-off-by: Zhu Lingshan --- drivers/vhost/vdpa.c | 53 ++++++++++++++++++++++++++++++++++++++++ include/uapi/linux/vhost.h | 2 ++ include/uapi/linux/vhost_types.h | 2 ++ 3 files changed, 57 insertions(+) diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 421f02a..f1f69bf 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -21,6 +21,7 @@ #include #include #include +#include #include "vhost.h" @@ -70,6 +71,7 @@ struct vhost_vdpa { int nvqs; int virtio_id; int minor; + struct eventfd_ctx *config_ctx; }; static DEFINE_IDA(vhost_vdpa_ida); @@ -101,6 +103,17 @@ static irqreturn_t vhost_vdpa_virtqueue_cb(void *private) return IRQ_HANDLED; } +static irqreturn_t vhost_vdpa_config_cb(void *private) +{ + struct vhost_vdpa *v = private; + struct eventfd_ctx *config_ctx = v->config_ctx; + + if (config_ctx) + eventfd_signal(config_ctx, 1); + + return IRQ_HANDLED; +} + static void vhost_vdpa_reset(struct vhost_vdpa *v) { struct vdpa_device *vdpa = v->vdpa; @@ -288,6 +301,42 @@ static long vhost_vdpa_get_vring_num(struct vhost_vdpa *v, u16 __user *argp) return 0; } +static void vhost_vdpa_config_put(struct vhost_vdpa *v) +{ + if (v->config_ctx) + eventfd_ctx_put(v->config_ctx); +} + +static long vhost_vdpa_set_config_call(struct vhost_vdpa *v, u32 __user *argp) +{ + struct vdpa_callback cb; + vhost_config_file file; + struct eventfd_ctx *ctx; + + cb.callback = vhost_vdpa_config_cb; + cb.private = v->vdpa; + if (copy_from_user(&file, argp, sizeof(file))) + return -EFAULT; + + if (file.fd == -1) { + vhost_vdpa_config_put(v); + v->config_ctx = NULL; + return PTR_ERR(v->config_ctx); + } + + ctx = eventfd_ctx_fdget(file.fd); + swap(ctx, v->config_ctx); + + if (!IS_ERR_OR_NULL(ctx)) + eventfd_ctx_put(ctx); + + if (IS_ERR(v->config_ctx)) + return PTR_ERR(v->config_ctx); + + v->vdpa->config->set_config_cb(v->vdpa, &cb); + + return 0; +} static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd, void __user *argp) { @@ -398,6 +447,9 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, case VHOST_SET_LOG_FD: r = -ENOIOCTLCMD; break; + case VHOST_VDPA_SET_CONFIG_CALL: + r = vhost_vdpa_set_config_call(v, argp); + break; default: r = vhost_dev_ioctl(&v->vdev, cmd, argp); if (r == -ENOIOCTLCMD) @@ -734,6 +786,7 @@ static int vhost_vdpa_release(struct inode *inode, struct file *filep) vhost_dev_stop(&v->vdev); vhost_vdpa_iotlb_free(v); vhost_vdpa_free_domain(v); + vhost_vdpa_config_put(v); vhost_dev_cleanup(&v->vdev); kfree(v->vdev.vqs); mutex_unlock(&d->mutex); diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h index 9fe72e4..c474a35 100644 --- a/include/uapi/linux/vhost.h +++ b/include/uapi/linux/vhost.h @@ -140,4 +140,6 @@ /* Get the max ring size. */ #define VHOST_VDPA_GET_VRING_NUM _IOR(VHOST_VIRTIO, 0x76, __u16) +/* Set event fd for config interrupt*/ +#define VHOST_VDPA_SET_CONFIG_CALL _IOW(VHOST_VIRTIO, 0x77, vhost_config_file) #endif diff --git a/include/uapi/linux/vhost_types.h b/include/uapi/linux/vhost_types.h index 669457c..6759aefb 100644 --- a/include/uapi/linux/vhost_types.h +++ b/include/uapi/linux/vhost_types.h @@ -27,6 +27,8 @@ struct vhost_vring_file { }; +typedef struct vhost_vring_file vhost_config_file; + struct vhost_vring_addr { unsigned int index; /* Option flags. */