From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D3F03C3A589 for ; Sun, 18 Aug 2019 11:09:27 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8A9CC206C1 for ; Sun, 18 Aug 2019 11:09:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8A9CC206C1 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:40228 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1hzJ3u-0006y8-JR for qemu-devel@archiver.kernel.org; Sun, 18 Aug 2019 07:09:26 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:37256) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1hzJ3D-0006Y2-JV for qemu-devel@nongnu.org; Sun, 18 Aug 2019 07:08:45 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hzJ3A-000565-Lc for qemu-devel@nongnu.org; Sun, 18 Aug 2019 07:08:42 -0400 Received: from mx1.redhat.com ([209.132.183.28]:34896) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hzJ3A-00054h-C6 for qemu-devel@nongnu.org; Sun, 18 Aug 2019 07:08:40 -0400 Received: from mail-qt1-f197.google.com (mail-qt1-f197.google.com [209.85.160.197]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 32D165945B for ; Sun, 18 Aug 2019 11:08:38 +0000 (UTC) Received: by mail-qt1-f197.google.com with SMTP id p56so745748qtb.10 for ; Sun, 18 Aug 2019 04:08:38 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=jRq0hEH2THBLWdKSSxk7tuIIHKZrpaOtQE56I4wsMmE=; b=MY1P8cU7Vac/p8lkijcnk2riYJWa8YnjI/U1KD1d4Fz8mbA6egt554d9LlUOTNofuO 22atNLHYpHTHJsAy2FiudZPZUT5pB3FQZ8TS1jsLOFqZRrEu6lBNY7An207Zxf9UQHgu FPvnFRKqLzuvgCac5y3aAYuNTUI88jStV/bpr2av4EQZP5aVH+JLPaa5ZaTHFOVztiDJ FXRV4ZBsQ7ppHmDPjl1NvSs7NQJkKBVb3/KDSljS6fgr9hWeBYMq/v26bgmnuAp0srfd WZwbIf8YsMwC9ybRkCi4T4qxTZdJWaL0xRgo4ljoKbKb/eBYjBdlPPJyT+duisbaZjQ+ lqyg== X-Gm-Message-State: APjAAAU+pxhHOxnL8Q9Uj0lLOmke2eFjpacMM7RuinfI+CxWW+/NZ3+d EB3FZqXaFewo/oPu378kK2aOz8gp4IvdIBEMBQ/B2+aDGqehU/pEsOy7xtZm69djy9+zRshCKlf zgPZCjQe1VSe2TD4= X-Received: by 2002:a05:620a:70f:: with SMTP id 15mr16354454qkc.171.1566126517445; Sun, 18 Aug 2019 04:08:37 -0700 (PDT) X-Google-Smtp-Source: APXvYqwthh6JMjEh/XG9BjQqkfSuUijLLRj0AVRa4FXZKR6ElDefL3gwisw+QhDEJFmp+sLOYGLGEA== X-Received: by 2002:a05:620a:70f:: with SMTP id 15mr16354441qkc.171.1566126517148; Sun, 18 Aug 2019 04:08:37 -0700 (PDT) Received: from redhat.com (bzq-79-180-62-110.red.bezeqint.net. [79.180.62.110]) by smtp.gmail.com with ESMTPSA id d9sm5466950qke.136.2019.08.18.04.08.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 18 Aug 2019 04:08:36 -0700 (PDT) Date: Sun, 18 Aug 2019 07:08:31 -0400 From: "Michael S. Tsirkin" To: "Dr. David Alan Gilbert (git)" Message-ID: <20190818065944-mutt-send-email-mst@kernel.org> References: <20190816143321.20903-1-dgilbert@redhat.com> <20190816143321.20903-2-dgilbert@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190816143321.20903-2-dgilbert@redhat.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] [PATCH 1/2] virtio: add vhost-user-fs base device X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-devel@nongnu.org, stefanha@redhat.com, vgoyal@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Fri, Aug 16, 2019 at 03:33:20PM +0100, Dr. David Alan Gilbert (git) wrote: > From: "Dr. David Alan Gilbert" > > The virtio-fs virtio device provides shared file system access using > the FUSE protocol carried ovew virtio. > The actual file server is implemented in an external vhost-user-fs device > backend process. > > Signed-off-by: Stefan Hajnoczi > Signed-off-by: Sebastien Boeuf > Signed-off-by: Dr. David Alan Gilbert > --- > configure | 13 + > hw/virtio/Makefile.objs | 1 + > hw/virtio/vhost-user-fs.c | 297 ++++++++++++++++++++ > include/hw/virtio/vhost-user-fs.h | 45 +++ > include/standard-headers/linux/virtio_fs.h | 41 +++ > include/standard-headers/linux/virtio_ids.h | 1 + > 6 files changed, 398 insertions(+) > create mode 100644 hw/virtio/vhost-user-fs.c > create mode 100644 include/hw/virtio/vhost-user-fs.h > create mode 100644 include/standard-headers/linux/virtio_fs.h > > diff --git a/configure b/configure > index 714e7fb6a1..e7e33ee783 100755 > --- a/configure > +++ b/configure > @@ -382,6 +382,7 @@ vhost_crypto="" > vhost_scsi="" > vhost_vsock="" > vhost_user="" > +vhost_user_fs="" > kvm="no" > hax="no" > hvf="no" > @@ -1316,6 +1317,10 @@ for opt do > ;; > --enable-vhost-vsock) vhost_vsock="yes" > ;; > + --disable-vhost-user-fs) vhost_user_fs="no" > + ;; > + --enable-vhost-user-fs) vhost_user_fs="yes" > + ;; > --disable-opengl) opengl="no" > ;; > --enable-opengl) opengl="yes" > @@ -2269,6 +2274,10 @@ test "$vhost_crypto" = "" && vhost_crypto=$vhost_user > if test "$vhost_crypto" = "yes" && test "$vhost_user" = "no"; then > error_exit "--enable-vhost-crypto requires --enable-vhost-user" > fi > +test "$vhost_user_fs" = "" && vhost_user_fs=$vhost_user > +if test "$vhost_user_fs" = "yes" && test "$vhost_user" = "no"; then > + error_exit "--enable-vhost-user-fs requires --enable-vhost-user" > +fi > > # OR the vhost-kernel and vhost-user values for simplicity > if test "$vhost_net" = ""; then > @@ -6425,6 +6434,7 @@ echo "vhost-crypto support $vhost_crypto" > echo "vhost-scsi support $vhost_scsi" > echo "vhost-vsock support $vhost_vsock" > echo "vhost-user support $vhost_user" > +echo "vhost-user-fs support $vhost_user_fs" > echo "Trace backends $trace_backends" > if have_backend "simple"; then > echo "Trace output file $trace_file-" > @@ -6921,6 +6931,9 @@ fi > if test "$vhost_user" = "yes" ; then > echo "CONFIG_VHOST_USER=y" >> $config_host_mak > fi > +if test "$vhost_user_fs" = "yes" ; then > + echo "CONFIG_VHOST_USER_FS=y" >> $config_host_mak > +fi > if test "$blobs" = "yes" ; then > echo "INSTALL_BLOBS=yes" >> $config_host_mak > fi > diff --git a/hw/virtio/Makefile.objs b/hw/virtio/Makefile.objs > index 964ce78607..47ffbf22c4 100644 > --- a/hw/virtio/Makefile.objs > +++ b/hw/virtio/Makefile.objs > @@ -11,6 +11,7 @@ common-obj-$(CONFIG_VIRTIO_PCI) += virtio-pci.o > common-obj-$(CONFIG_VIRTIO_MMIO) += virtio-mmio.o > obj-$(CONFIG_VIRTIO_BALLOON) += virtio-balloon.o > obj-$(CONFIG_VIRTIO_CRYPTO) += virtio-crypto.o > +obj-$(CONFIG_VHOST_USER_FS) += vhost-user-fs.o > obj-$(call land,$(CONFIG_VIRTIO_CRYPTO),$(CONFIG_VIRTIO_PCI)) += virtio-crypto-pci.o > obj-$(CONFIG_VIRTIO_PMEM) += virtio-pmem.o > common-obj-$(call land,$(CONFIG_VIRTIO_PMEM),$(CONFIG_VIRTIO_PCI)) += virtio-pmem-pci.o > diff --git a/hw/virtio/vhost-user-fs.c b/hw/virtio/vhost-user-fs.c > new file mode 100644 > index 0000000000..2753c2c07a > --- /dev/null > +++ b/hw/virtio/vhost-user-fs.c > @@ -0,0 +1,297 @@ > +/* > + * Vhost-user filesystem virtio device > + * > + * Copyright 2018 Red Hat, Inc. > + * > + * Authors: > + * Stefan Hajnoczi > + * > + * This work is licensed under the terms of the GNU GPL, version 2 or > + * (at your option) any later version. See the COPYING file in the > + * top-level directory. > + */ > + > +#include "qemu/osdep.h" > +#include > +#include "standard-headers/linux/virtio_fs.h" > +#include "qapi/error.h" > +#include "hw/virtio/virtio-bus.h" > +#include "hw/virtio/virtio-access.h" > +#include "qemu/error-report.h" > +#include "hw/virtio/vhost-user-fs.h" > +#include "monitor/monitor.h" > + > +static void vuf_get_config(VirtIODevice *vdev, uint8_t *config) > +{ > + VHostUserFS *fs = VHOST_USER_FS(vdev); > + struct virtio_fs_config fscfg = {}; > + > + memcpy((char *)fscfg.tag, fs->conf.tag, > + MIN(strlen(fs->conf.tag) + 1, sizeof(fscfg.tag))); > + > + virtio_stl_p(vdev, &fscfg.num_queues, fs->conf.num_queues); > + > + memcpy(config, &fscfg, sizeof(fscfg)); > +} > + > +static void vuf_start(VirtIODevice *vdev) > +{ > + VHostUserFS *fs = VHOST_USER_FS(vdev); > + BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); > + VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); > + int ret; > + int i; > + > + if (!k->set_guest_notifiers) { > + error_report("binding does not support guest notifiers"); > + return; > + } > + > + ret = vhost_dev_enable_notifiers(&fs->vhost_dev, vdev); > + if (ret < 0) { > + error_report("Error enabling host notifiers: %d", -ret); > + return; > + } > + > + ret = k->set_guest_notifiers(qbus->parent, fs->vhost_dev.nvqs, true); > + if (ret < 0) { > + error_report("Error binding guest notifier: %d", -ret); > + goto err_host_notifiers; > + } > + > + fs->vhost_dev.acked_features = vdev->guest_features; > + ret = vhost_dev_start(&fs->vhost_dev, vdev); > + if (ret < 0) { > + error_report("Error starting vhost: %d", -ret); > + goto err_guest_notifiers; > + } > + > + /* > + * guest_notifier_mask/pending not used yet, so just unmask > + * everything here. virtio-pci will do the right thing by > + * enabling/disabling irqfd. > + */ > + for (i = 0; i < fs->vhost_dev.nvqs; i++) { > + vhost_virtqueue_mask(&fs->vhost_dev, vdev, i, false); > + } > + > + return; > + > +err_guest_notifiers: > + k->set_guest_notifiers(qbus->parent, fs->vhost_dev.nvqs, false); > +err_host_notifiers: > + vhost_dev_disable_notifiers(&fs->vhost_dev, vdev); > +} > + > +static void vuf_stop(VirtIODevice *vdev) > +{ > + VHostUserFS *fs = VHOST_USER_FS(vdev); > + BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); > + VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); > + int ret; > + > + if (!k->set_guest_notifiers) { > + return; > + } > + > + vhost_dev_stop(&fs->vhost_dev, vdev); > + > + ret = k->set_guest_notifiers(qbus->parent, fs->vhost_dev.nvqs, false); > + if (ret < 0) { > + error_report("vhost guest notifier cleanup failed: %d", ret); > + return; > + } > + > + vhost_dev_disable_notifiers(&fs->vhost_dev, vdev); > +} > + > +static void vuf_set_status(VirtIODevice *vdev, uint8_t status) > +{ > + VHostUserFS *fs = VHOST_USER_FS(vdev); > + bool should_start = status & VIRTIO_CONFIG_S_DRIVER_OK; > + > + if (!vdev->vm_running) { > + should_start = false; > + } > + > + if (fs->vhost_dev.started == should_start) { > + return; > + } > + > + if (should_start) { > + vuf_start(vdev); > + } else { > + vuf_stop(vdev); > + } > +} > + > +static uint64_t vuf_get_features(VirtIODevice *vdev, > + uint64_t requested_features, > + Error **errp) > +{ > + /* No feature bits used yet */ > + return requested_features; > +} > + > +static void vuf_handle_output(VirtIODevice *vdev, VirtQueue *vq) > +{ > + /* Do nothing */ Why is this safe? Is this because this never triggers? assert(0) then? If it triggers then backend won't be notified, which might cause it to get stuck. > +} > + > +static void vuf_guest_notifier_mask(VirtIODevice *vdev, int idx, > + bool mask) > +{ > + VHostUserFS *fs = VHOST_USER_FS(vdev); > + > + vhost_virtqueue_mask(&fs->vhost_dev, vdev, idx, mask); > +} > + > +static bool vuf_guest_notifier_pending(VirtIODevice *vdev, int idx) > +{ > + VHostUserFS *fs = VHOST_USER_FS(vdev); > + > + return vhost_virtqueue_pending(&fs->vhost_dev, idx); > +} > + > +static void vuf_device_realize(DeviceState *dev, Error **errp) > +{ > + VirtIODevice *vdev = VIRTIO_DEVICE(dev); > + VHostUserFS *fs = VHOST_USER_FS(dev); > + unsigned int i; > + size_t len; > + int ret; > + > + if (!fs->conf.chardev.chr) { > + error_setg(errp, "missing chardev"); > + return; > + } > + > + if (!fs->conf.tag) { > + error_setg(errp, "missing tag property"); > + return; > + } > + len = strlen(fs->conf.tag); > + if (len == 0) { > + error_setg(errp, "tag property cannot be empty"); > + return; > + } > + if (len > sizeof_field(struct virtio_fs_config, tag)) { > + error_setg(errp, "tag property must be %zu bytes or less", > + sizeof_field(struct virtio_fs_config, tag)); > + return; > + } > + > + if (fs->conf.num_queues == 0) { > + error_setg(errp, "num-queues property must be larger than 0"); > + return; > + } The strange thing is that actual # of queues is this number + 2. And this affects an optimal number of vectors (see patch 2). Not sure what a good solution is - include the mandatory queues in the number? Needs to be documented in some way. > + > + if (!is_power_of_2(fs->conf.queue_size)) { > + error_setg(errp, "queue-size property must be a power of 2"); > + return; > + } Hmm packed ring allows non power of 2 ... We need to look into a generic helper to support VQ size checks. > + > + if (fs->conf.queue_size > VIRTQUEUE_MAX_SIZE) { > + error_setg(errp, "queue-size property must be %u or smaller", > + VIRTQUEUE_MAX_SIZE); > + return; > + } > + > + if (!vhost_user_init(&fs->vhost_user, &fs->conf.chardev, errp)) { > + return; > + } > + > + virtio_init(vdev, "vhost-user-fs", VIRTIO_ID_FS, > + sizeof(struct virtio_fs_config)); > + > + /* Notifications queue */ > + virtio_add_queue(vdev, fs->conf.queue_size, vuf_handle_output); > + > + /* Hiprio queue */ > + virtio_add_queue(vdev, fs->conf.queue_size, vuf_handle_output); > Weird, spec patch v6 says: +\item[0] hiprio +\item[1\ldots n] request queues where's the Notifications queue coming from? > + /* Request queues */ > + for (i = 0; i < fs->conf.num_queues; i++) { > + virtio_add_queue(vdev, fs->conf.queue_size, vuf_handle_output); > + } > + > + /* 1 high prio queue, plus the number configured */ > + fs->vhost_dev.nvqs = 1 + fs->conf.num_queues; > + fs->vhost_dev.vqs = g_new0(struct vhost_virtqueue, fs->vhost_dev.nvqs); > + ret = vhost_dev_init(&fs->vhost_dev, &fs->vhost_user, > + VHOST_BACKEND_TYPE_USER, 0); > + if (ret < 0) { > + error_setg_errno(errp, -ret, "vhost_dev_init failed"); > + goto err_virtio; > + } > + > + return; > + > +err_virtio: > + vhost_user_cleanup(&fs->vhost_user); > + virtio_cleanup(vdev); > + g_free(fs->vhost_dev.vqs); > + return; > +} > + > +static void vuf_device_unrealize(DeviceState *dev, Error **errp) > +{ > + VirtIODevice *vdev = VIRTIO_DEVICE(dev); > + VHostUserFS *fs = VHOST_USER_FS(dev); > + > + /* This will stop vhost backend if appropriate. */ > + vuf_set_status(vdev, 0); > + > + vhost_dev_cleanup(&fs->vhost_dev); > + > + vhost_user_cleanup(&fs->vhost_user); > + > + virtio_cleanup(vdev); > + g_free(fs->vhost_dev.vqs); > + fs->vhost_dev.vqs = NULL; > +} > + > +static const VMStateDescription vuf_vmstate = { > + .name = "vhost-user-fs", > + .unmigratable = 1, > +}; > + > +static Property vuf_properties[] = { > + DEFINE_PROP_CHR("chardev", VHostUserFS, conf.chardev), > + DEFINE_PROP_STRING("tag", VHostUserFS, conf.tag), > + DEFINE_PROP_UINT16("num-queues", VHostUserFS, conf.num_queues, 1), > + DEFINE_PROP_UINT16("queue-size", VHostUserFS, conf.queue_size, 128), > + DEFINE_PROP_STRING("vhostfd", VHostUserFS, conf.vhostfd), > + DEFINE_PROP_END_OF_LIST(), > +}; > + > +static void vuf_class_init(ObjectClass *klass, void *data) > +{ > + DeviceClass *dc = DEVICE_CLASS(klass); > + VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); > + > + dc->props = vuf_properties; > + dc->vmsd = &vuf_vmstate; > + set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); > + vdc->realize = vuf_device_realize; > + vdc->unrealize = vuf_device_unrealize; > + vdc->get_features = vuf_get_features; > + vdc->get_config = vuf_get_config; > + vdc->set_status = vuf_set_status; > + vdc->guest_notifier_mask = vuf_guest_notifier_mask; > + vdc->guest_notifier_pending = vuf_guest_notifier_pending; > +} > + > +static const TypeInfo vuf_info = { > + .name = TYPE_VHOST_USER_FS, > + .parent = TYPE_VIRTIO_DEVICE, > + .instance_size = sizeof(VHostUserFS), > + .class_init = vuf_class_init, > +}; > + > +static void vuf_register_types(void) > +{ > + type_register_static(&vuf_info); > +} > + > +type_init(vuf_register_types) > diff --git a/include/hw/virtio/vhost-user-fs.h b/include/hw/virtio/vhost-user-fs.h > new file mode 100644 > index 0000000000..d07ab134b9 > --- /dev/null > +++ b/include/hw/virtio/vhost-user-fs.h > @@ -0,0 +1,45 @@ > +/* > + * Vhost-user filesystem virtio device > + * > + * Copyright 2018 Red Hat, Inc. > + * > + * Authors: > + * Stefan Hajnoczi > + * > + * This work is licensed under the terms of the GNU GPL, version 2 or > + * (at your option) any later version. See the COPYING file in the > + * top-level directory. > + */ > + > +#ifndef _QEMU_VHOST_USER_FS_H > +#define _QEMU_VHOST_USER_FS_H > + > +#include "hw/virtio/virtio.h" > +#include "hw/virtio/vhost.h" > +#include "hw/virtio/vhost-user.h" > +#include "chardev/char-fe.h" > + > +#define TYPE_VHOST_USER_FS "x-vhost-user-fs-device" > +#define VHOST_USER_FS(obj) \ > + OBJECT_CHECK(VHostUserFS, (obj), TYPE_VHOST_USER_FS) > + > +typedef struct { > + CharBackend chardev; > + char *tag; > + uint16_t num_queues; > + uint16_t queue_size; > + char *vhostfd; > +} VHostUserFSConf; > + > +typedef struct { > + /*< private >*/ > + VirtIODevice parent; > + VHostUserFSConf conf; > + struct vhost_virtqueue *vhost_vqs; > + struct vhost_dev vhost_dev; > + VhostUserState vhost_user; > + > + /*< public >*/ > +} VHostUserFS; > + > +#endif /* _QEMU_VHOST_USER_FS_H */ > diff --git a/include/standard-headers/linux/virtio_fs.h b/include/standard-headers/linux/virtio_fs.h > new file mode 100644 > index 0000000000..4f811a0b70 > --- /dev/null > +++ b/include/standard-headers/linux/virtio_fs.h > @@ -0,0 +1,41 @@ > +#ifndef _LINUX_VIRTIO_FS_H > +#define _LINUX_VIRTIO_FS_H > +/* This header is BSD licensed so anyone can use the definitions to implement > + * compatible drivers/servers. > + * > + * Redistribution and use in source and binary forms, with or without > + * modification, are permitted provided that the following conditions > + * are met: > + * 1. Redistributions of source code must retain the above copyright > + * notice, this list of conditions and the following disclaimer. > + * 2. Redistributions in binary form must reproduce the above copyright > + * notice, this list of conditions and the following disclaimer in the > + * documentation and/or other materials provided with the distribution. > + * 3. Neither the name of IBM nor the names of its contributors > + * may be used to endorse or promote products derived from this software > + * without specific prior written permission. > + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND > + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE > + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE > + * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE > + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL > + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS > + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) > + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT > + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY > + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF > + * SUCH DAMAGE. */ > +#include "standard-headers/linux/types.h" > +#include "standard-headers/linux/virtio_ids.h" > +#include "standard-headers/linux/virtio_config.h" > +#include "standard-headers/linux/virtio_types.h" > + > +struct virtio_fs_config { > + /* Filesystem name (UTF-8, not NUL-terminated, padded with NULs) */ > + uint8_t tag[36]; > + > + /* Number of request queues */ > + uint32_t num_queues; > +} QEMU_PACKED; > + > +#endif /* _LINUX_VIRTIO_FS_H */ > diff --git a/include/standard-headers/linux/virtio_ids.h b/include/standard-headers/linux/virtio_ids.h > index 32b2f94d1f..73fc004807 100644 > --- a/include/standard-headers/linux/virtio_ids.h > +++ b/include/standard-headers/linux/virtio_ids.h > @@ -43,6 +43,7 @@ > #define VIRTIO_ID_INPUT 18 /* virtio input */ > #define VIRTIO_ID_VSOCK 19 /* virtio vsock transport */ > #define VIRTIO_ID_CRYPTO 20 /* virtio crypto */ > +#define VIRTIO_ID_FS 26 /* virtio filesystem */ > #define VIRTIO_ID_PMEM 27 /* virtio pmem */ > > #endif /* _LINUX_VIRTIO_IDS_H */ > -- > 2.21.0