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...different patch series posted on the mailing list sparked a discussion on block device operations One is Jeff Cody's multiple-device snapshot series, documented [[Features/SnapshotsMultipleDevices|here]].

* the new block-copy feature can assert on unaligned images [https://lists.gnu.org/archive/ == Targeted Features ==

features that change the format in an incompatible way, so that older increase in order to introduce some incompatible features, however it's

=== New deprecated options and features === * Parsing of key,value pair filenames for the RBD block device

...QAPI/GuestAgent Guest Agent]. Please check the guest [http://wiki.qemu.org/Features/QAPI/GuestAgent Guest Agent] page for design and implementation details. The two main guest agent features of interest to live snapshots are:

...ing to I/O errors; patch proposed: https://lists.gnu.org/archive/html/qemu-block/2022-08/msg00375.html == Targeted Features ==

...host-user-blk device backend although the QEMU block layer has a number of features that make QEMU desirable as a software-defined storage appliance in its own

uint64_t features; /* format feature bits */ /* if (features & QED_F_BACKING_FILE) */

...It should integrate into the existing build system. Currently, we allow features to be specified in for inclusion in a boolean fashion (either 'y' or 'n' to ...mechanism to support third party extensions to QEMU or out of tree drivers/features

* The "autoload" parameter of the "block-dirty-bitmap-add" QMP command has been removed (it's no longer needed). === New deprecated options and features ===

Future qemu is expected to support these features (some already implemented): = Live features =

* mps3-an524: Fix MPC setting for SRAM block == Targeted Features ==

...s without a native code generator can use the TCG interpreter (TCI). See [[Features/TCI]] for more information. == Block devices (disks) ==

...cpu-add QMP command. More details [[Features/CPUHotplug#cpu-add_interface|Features/CPUHotplug]]. ...ltered-features" to allow introspection of supported and not supported CPU features.

...registers mean we can boot more recent Linux kernels that probe for these features * Removed dependency on external kernel headers, all supported KVM features are now built into the binary

...[https://qemu-project.gitlab.io/qemu/about/removed-features.html 'Removed features' ] page for details of suggested replacement functionality === New deprecated options and features ===

* Fixed block load instructions regression happened in 1.0 release. ...g a pflash drive. This feature is not supported when KVM is enabled. See [[Features/PC System Flash]] for more information.

== Block subsystem == * Tested all 9p file system ( security models, features like mmap, locking, posixacl, zerocopy) using the basic fs tests, I/O and s

* Host floppy device pass-through (block driver “host_floppy”) has been removed; it is still possible to use the * Block device parameter aio=native has no effect without cache.direct=on. It will

...size configurations, with the logical block size smaller than the physical block size, are rejected. ...eprecated Features"] appendix for the full list of historically deprecated features/options.

=== New deprecated options and features === ...eprecated Features"] appendix for the full list of historically deprecated features/options.

...ockdev setup). Fix is on the list: https://lists.gnu.org/archive/html/qemu-block/2018-11/msg00759.html == Targeted Features ==

easy to understand and implement. The fine-grained features are marked Requests that exceed the current limit must be queued since block I/O is

...MODEL'',enforce", of course as long as TCG or KVM support the CPU's set of features. Previously, a few CPUs included extraneous CPUID flags that cause "-cpu '' === Block devices in system emulation ===

=== [[Features/VNC_Tight_PNG|Tight PNG]] === ...the queue will be threaded and (hopefully) send_framebuffer_update() won't block the guest execution anymore.

...[https://qemu-project.gitlab.io/qemu/about/removed-features.html 'Removed features'] page for details of suggested replacement functionality. ==== Other removed features ====

[[Features/QED | QED]] is another new QEMU image format. Below is the FVD developer’ .../ext4, reiserFS, Reiser4, XFS, JFS, VMFS, ZFS, etc) provide many different features and are optimized for different objectives (flash wear leveling, seek dista

* A thin layer sits between device emulation and net/block layer |Storage replication QEMU's block migration or others

=== New deprecated options and features === ...System Emulation User's Guide for the full list of historically deprecated features/options.

=== New deprecated options and features === ...eprecated Features"] appendix for the full list of historically deprecated features/options.

* Removed support for tftp:// in the block layer, since this has been broken forever for files bigger than 256KB. ...command blockdev-add is still a work in progress. It doesn't support all block drivers, it lacks a matching blockdev-del, and more. It might change incom

=== New deprecated options and features === ...System Emulation User's Guide for the full list of historically deprecated features/options.

...n a VM writes to a data block, the lower layers decide where to store that block. Traditionally, storage allocation is done twice, first by an image format .../ext4, reiserFS, Reiser4, XFS, JFS, VMFS, ZFS, etc) provide many different features and are optimized for different objectives (flash wear leveling, seek dista

* New "invtsc" (Invariant TSC) CPU feature. When enabled, this will block migration and savevm, so it is not enabled by default on any CPU model. To === Block devices in system emulation ===

* Initial support for KVM on AArch64 systems (some features such as migration are not yet implemented) ...5420 is needed. In particular hotplug, pvpanic device and other ACPI based features now work for OVMF.

...[https://qemu-project.gitlab.io/qemu/about/removed-features.html 'Removed features' ] page for details of suggested replacement functionality ...maintained. Users are recommended to switch to an alternative distributed block device driver such as RBD.

...[https://qemu-project.gitlab.io/qemu/about/removed-features.html 'Removed features' ] page for details of suggested replacement functionality === New deprecated options and features ===

==Outstanding features== * Block device support (i.e. QED on LVM volumes)

=== Removed features and incompatible changes === ...[https://qemu-project.gitlab.io/qemu/about/removed-features.html 'Removed features'] page for details of suggested replacement functionality.

...nected to the Ardunio. Each widget is defined as a block that can have two features:

; QEMU User-mode Emulation User's Guide (docs/user, [[Features/Documentation/user]]) ; QEMU System Emulation User's Guide (docs/system, [[Features/Documentation/system]])

...are needed to make reporting of block job error events robust (otherwise, block jobs just disappear and, if management misses BLOCK_JOB_COMPLETED events, i * QEMUMachine has been replaced with a QOM hierarchy, details on [[Features/QOM/Machine]].

=== Removed features and incompatible changes === ...[https://qemu-project.gitlab.io/qemu/about/removed-features.html 'Removed features'] page for details of suggested replacement functionality.

=== Removed features and incompatible changes === ...[https://qemu-project.gitlab.io/qemu/about/removed-features.html 'Removed features'] page for details of suggested replacement functionality.

* COLO Block Replication (Please refer to [http://wiki.qemu.org/Features/BlockReplication BlockReplication]) : The following is the image of block replication workflow:

* Don't allow multiwrites against a block device without underlying medium {{git|a0af597d00c27741a0bf99720209def055f4 * Various bug fixes, no new features.

=== Removed features and incompatible changes === ...[https://qemu-project.gitlab.io/qemu/about/removed-features.html 'Removed features'] page for details of suggested replacement functionality.

...[https://qemu-project.gitlab.io/qemu/about/removed-features.html 'Removed features' ] page for details of suggested replacement functionality. === New deprecated options and features ===

...the internal implementation of QMP to simplify maintainability and enable features such as asynchronous command completion and rich error reporting. Minimize # @device: This is normally the name of a block device but it may also be 'vnc'.

'''Summary:''' The [[Features/tcg-multithread|MTTCG Project]] is a project * Place TranslationBlock structures into the same memory block as code_gen_buffer