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Tsirkin" , hare@suse.de, Hanna Reitz Subject: Re: [PATCH v10 2/4] qcow2: add configurations for zoned format extension In-Reply-To: <20260510175059.311814-3-faithilikerun@gmail.com> (Sam Li's message of "Sun, 10 May 2026 19:50:57 +0200") References: <20260510175059.311814-1-faithilikerun@gmail.com> <20260510175059.311814-3-faithilikerun@gmail.com> Date: Mon, 18 May 2026 09:57:06 +0200 Message-ID: <87mrxxw3ot.fsf@pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass client-ip=170.10.133.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.445, 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_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sam Li writes: > To configure the zoned format feature on the qcow2 driver, it > requires settings as: the device size, zone model, zone size, > zone capacity, number of conventional zones, limits on zone > resources (max append bytes, max open zones, and max_active_zones). > > To create a qcow2 image with zoned format feature, use command like > this: > qemu-img create -f qcow2 zbc.qcow2 -o size=768M \ > -o zone.size=64M -o zone.capacity=64M -o zone.conventional_zones=0 \ > -o zone.max_append_bytes=4096 -o zone.max_open_zones=6 \ > -o zone.max_active_zones=8 -o zone.mode=host-managed > > Signed-off-by: Sam Li [...] Just doc polish this time around. Never been closer! > diff --git a/qapi/block-core.json b/qapi/block-core.json > index 508b081ac1..d771dfb4a1 100644 > --- a/qapi/block-core.json > +++ b/qapi/block-core.json > @@ -5268,6 +5268,70 @@ > { 'enum': 'Qcow2CompressionType', > 'data': [ 'zlib', { 'name': 'zstd', 'if': 'CONFIG_ZSTD' } ] } > > +## > +# @Qcow2ZoneModel: > +# > +# Zoned device model used in qcow2 image file > +# > +# @host-managed: The host-managed model only allows sequential write > +# over the device zones. > +# > +# Since 11.0 It's 11.1 now. More of the same below, not flagging it again. > +## > +{ 'enum': 'Qcow2ZoneModel', > + 'data': [ 'host-managed'] } > + > +## > +# @Qcow2ZoneHostManaged: > +# > +# The host-managed zone model. It only allows sequential writes. > +# > +# @size: Total number of bytes within zones (default 256 MB). > +# > +# @capacity: The number of usable logical blocks within zones > +# in bytes. A zone capacity is always smaller or equal to the > +# zone size (default to zone size). "Number blocks ... in bytes" is awkward. Do you mean the usable space, which is a multiple of the logical block size? > +# > +# @conventional-zones: The number of conventional zones of the > +# zoned device (default 0). > +# > +# @max-open-zones: The maximal number of open zones. It is less than > +# or equal to the number of sequential write required zones of > +# the device (default 0). Is the "number of sequential write required zones" visible via QMP? > +# > +# @max-active-zones: The maximal number of zones in the implicit > +# open, explicit open or closed state. It is less than or equal > +# to the max open zones (default 0). "to the maximal number of open zones" or "to @max-open-zones" > +# > +# @max-append-bytes: The maximal number of bytes of a zone > +# append request that can be issued to the device. It must be > +# 512-byte aligned and less than the zone capacity > +# (default 64 KB). "Must be 512-byte aligned": do you mean it must be a multiple of 512? > +# > +# Since 11.0 > +## > +{ 'struct': 'Qcow2ZoneHostManaged', > + 'data': { '*size': 'size', > + '*capacity': 'size', > + '*conventional-zones': 'uint32', > + '*max-open-zones': 'uint32', > + '*max-active-zones': 'uint32', > + '*max-append-bytes': 'size' } } > + > +## > +# @Qcow2ZoneCreateOptions: > +# > +# The zone device model for the qcow2 image. "Device model" has a specific meaning in QEMU: it's a device frontend, such as "ide-hd", "e1000", "usb-tablet", ... Maybe something like "Creation options for zoned qcow2 images"? > +# > +# @mode: The zone device model modes. Sure its plural modes, and not mode? > +# > +# Since 11.0 > +## > +{ 'union': 'Qcow2ZoneCreateOptions', > + 'base': { 'mode': 'Qcow2ZoneModel' }, > + 'discriminator': 'mode', > + 'data': { 'host-managed': 'Qcow2ZoneHostManaged' } } > + > ## > # @BlockdevCreateOptionsQcow2: > # > @@ -5310,6 +5374,9 @@ > # @compression-type: The image cluster compression method > # (default: zlib, since 5.1) > # > +# @zone: The zone device model modes. The default is that the > +# device is not zoned. (since 11.0) Maybe something like # @zone: Options for zoned images. If absent, the device is not # zoned. (Since 11.0) > +# > # Since: 2.12 > ## > { 'struct': 'BlockdevCreateOptionsQcow2', > @@ -5326,7 +5393,8 @@ > '*preallocation': 'PreallocMode', > '*lazy-refcounts': 'bool', > '*refcount-bits': 'int', > - '*compression-type':'Qcow2CompressionType' } } > + '*compression-type':'Qcow2CompressionType', > + '*zone': 'Qcow2ZoneCreateOptions' } } > > ## > # @BlockdevCreateOptionsQed: