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Thu, 04 May 2023 02:28:53 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ6lnEua7UUrMpAKxN07Get+3YADPNjDSVU4lbyfwGQGipI3Ig4KJnZH3EkiFKPFSey6gs2qZA== X-Received: by 2002:a5d:6648:0:b0:306:368d:8a1c with SMTP id f8-20020a5d6648000000b00306368d8a1cmr1951269wrw.45.1683192532630; Thu, 04 May 2023 02:28:52 -0700 (PDT) From: Stefano Garzarella To: qemu-devel@nongnu.org Cc: Hanna Reitz , qemu-block@nongnu.org, Eric Blake , Markus Armbruster , Stefan Hajnoczi , Kevin Wolf , Paolo Bonzini , jjongsma@redhat.com, Stefano Garzarella Subject: [PATCH v2 1/2] stubs/monitor: add monitor_fd_param() Date: Thu, 4 May 2023 11:28:42 +0200 Message-Id: <20230504092843.62493-2-sgarzare@redhat.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230504092843.62493-1-sgarzare@redhat.com> References: <20230504092843.62493-1-sgarzare@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=sgarzare@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.161, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1683192578792100003 Content-Type: text/plain; charset="utf-8" The blkio block driver will use monitor_fd_param() to support file descriptor passing. This is possible in builds (e.g. softmmu) where the monitor API is available. Add the monitor_fd_param() stub so tools and tests that link the block layer can build successfully. Signed-off-by: Stefano Garzarella --- Notes: v2: - added this patch to use monitor_fd_param() in the blkio module stubs/monitor.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/stubs/monitor.c b/stubs/monitor.c index 20786ac4ff..0bcd49e41e 100644 --- a/stubs/monitor.c +++ b/stubs/monitor.c @@ -9,6 +9,12 @@ int monitor_get_fd(Monitor *mon, const char *name, Error *= *errp) return -1; } =20 +int monitor_fd_param(Monitor *mon, const char *fdname, Error **errp) +{ + error_setg(errp, "only QEMU supports file descriptor passing"); + return -1; +} + void monitor_init_hmp(Chardev *chr, bool use_readline, Error **errp) { } --=20 2.40.1 From nobody Wed May 15 17:18:04 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; 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Thu, 04 May 2023 02:28:58 -0700 (PDT) From: Stefano Garzarella To: qemu-devel@nongnu.org Cc: Hanna Reitz , qemu-block@nongnu.org, Eric Blake , Markus Armbruster , Stefan Hajnoczi , Kevin Wolf , Paolo Bonzini , jjongsma@redhat.com, Stefano Garzarella Subject: [PATCH v2 2/2] block/blkio: add 'fd' option to virtio-blk-vhost-vdpa driver Date: Thu, 4 May 2023 11:28:43 +0200 Message-Id: <20230504092843.62493-3-sgarzare@redhat.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230504092843.62493-1-sgarzare@redhat.com> References: <20230504092843.62493-1-sgarzare@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=sgarzare@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.161, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1683192579737100005 Content-Type: text/plain; charset="utf-8" The virtio-blk-vhost-vdpa driver in libblkio 1.3.0 supports the new 'fd' property. Let's expose this to the user, so the management layer can pass the file descriptor of an already opened vhost-vdpa character device. This is useful especially when the device can only be accessed with certain privileges. Signed-off-by: Stefano Garzarella --- Notes: v2: - used monitor_fd_param() to parse the fd like vhost devices [Stefan] qapi/block-core.json | 6 ++++- block/blkio.c | 53 +++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 57 insertions(+), 2 deletions(-) diff --git a/qapi/block-core.json b/qapi/block-core.json index b57978957f..9f70777d49 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -3841,10 +3841,14 @@ # # @path: path to the vhost-vdpa character device. # +# @fd: file descriptor of an already opened vhost-vdpa character device. +# (Since 8.1) +# # Since: 7.2 ## { 'struct': 'BlockdevOptionsVirtioBlkVhostVdpa', - 'data': { 'path': 'str' }, + 'data': { '*path': 'str', + '*fd': 'str' }, 'if': 'CONFIG_BLKIO' } =20 ## diff --git a/block/blkio.c b/block/blkio.c index 0cdc99a729..66b3dd2cd0 100644 --- a/block/blkio.c +++ b/block/blkio.c @@ -18,6 +18,7 @@ #include "qapi/qmp/qdict.h" #include "qemu/module.h" #include "exec/memory.h" /* for ram_block_discard_disable() */ +#include "monitor/monitor.h" =20 #include "block/block-io.h" =20 @@ -694,6 +695,56 @@ static int blkio_virtio_blk_common_open(BlockDriverSta= te *bs, return 0; } =20 +static int blkio_virtio_blk_vhost_vdpa_open(BlockDriverState *bs, + QDict *options, int flags, Error **errp) +{ + const char *path =3D qdict_get_try_str(options, "path"); + const char *fd_str =3D qdict_get_try_str(options, "fd"); + BDRVBlkioState *s =3D bs->opaque; + int ret; + + if (path && fd_str) { + error_setg(errp, "'path' and 'fd' options are mutually exclusive"); + return -EINVAL; + } + + if (!path && !fd_str) { + error_setg(errp, "none of 'path' or 'fd' options was specified"); + return -EINVAL; + } + + if (path) { + ret =3D blkio_set_str(s->blkio, "path", path); + qdict_del(options, "path"); + if (ret < 0) { + error_setg_errno(errp, -ret, "failed to set path: %s", + blkio_get_error_msg()); + return ret; + } + } else { + int fd =3D monitor_fd_param(monitor_cur(), fd_str, errp); + + if (fd < 0) { + error_prepend(errp, "unable to parse 'fd' option: "); + return -EINVAL; + } + + ret =3D blkio_set_int(s->blkio, "fd", fd); + qdict_del(options, "fd"); + if (ret < 0) { + error_setg_errno(errp, -ret, "failed to set fd: %s", + blkio_get_error_msg()); + return ret; + } + } + + if (!(flags & BDRV_O_NOCACHE)) { + error_setg(errp, "cache.direct=3Doff is not supported"); + return -EINVAL; + } + return 0; +} + static int blkio_file_open(BlockDriverState *bs, QDict *options, int flags, Error **errp) { @@ -717,7 +768,7 @@ static int blkio_file_open(BlockDriverState *bs, QDict = *options, int flags, } else if (strcmp(blkio_driver, DRIVER_VIRTIO_BLK_VHOST_USER) =3D=3D 0= ) { ret =3D blkio_virtio_blk_common_open(bs, options, flags, errp); } else if (strcmp(blkio_driver, DRIVER_VIRTIO_BLK_VHOST_VDPA) =3D=3D 0= ) { - ret =3D blkio_virtio_blk_common_open(bs, options, flags, errp); + ret =3D blkio_virtio_blk_vhost_vdpa_open(bs, options, flags, errp); } else { g_assert_not_reached(); } --=20 2.40.1