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* 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

* Host floppy device pass-through (block driver "host_floppy") is deprecated, and will be dropped in a future releas * Block device parameter aio=native has no effect without cache.direct=on. It will

* [[Features/QTest|QTest]]-based tests, which inject predefined stimuli into the device * [[Testing/QemuIoTests|qemu-iotests]], a regression test suite for the block layer code.

...[https://qemu-project.gitlab.io/qemu/system/removed-features.html 'Removed features' ] page for details of suggested replacement functionality * The ''encryption_key_missing'' field has been removed from block device info data

.../master/system/deprecated.html#recently-removed-features "Recently removed features"] chapter of the QEMU System Emulation User's Guide. === New deprecated options and features ===

This page lists areas in the implementation of [[Features/Channel_I/O_Passthrough|vfio-ccw for channel I/O passthrough]] that still n == Missing architecture features ==

...e. Only x3270 is supported as client. See https://wiki.qemu.org/index.php/Features/3270 for details. ...vfio-ccw (channel device passthrough). See https://wiki.qemu.org/index.php/Features/Channel_I/O_Passthrough for details.

* Support for network boot, see http://wiki.qemu-project.org/Features/S390xNetworkBoot ==== Block devices ====

====Coroutines in the block layer [Kevin]==== * Programming model to simplify block drivers without blocking QEMU threads

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

** fix: https://lists.gnu.org/archive/html/qemu-block/2020-11/msg00674.html ...already registered) - not a recent regression, thus this should likely not block the release

There are several features still pending: Persistence is the ability to save dirty block information to persistent storage in order to completely shut down QEMU wit

...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 ==== Block devices ====

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

* Specifying block device parameter aio=native is now an error on POSIX systems if qemu is com ...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

...than q35 does (e.g. interrupt remapping). As time permits, some additional features could already be added so that q35 could be manually configured to expose t Minimally required VT-d features for q35 are:

More detail: [[Features/Real rng device]] ...e amount of entropy the host has to give. Doing mouse, keyboard, network, block activity on the host will accelerate the speed with which the host can give

For booting an s390x guest via network, see the dedicated page [[Features/S390xNetworkBoot]]. In this case I was using a block device via a ZFS pool, but a normal qcow2 device would work just as well.

...ill in the configuration files, and no way to express dependencies between features. The project seeks to adopt Linux's Kconfig in QEMU, and possibly to impro Useful features which can be added:

- block: Handle multiwrite errors only when all requests have completed - block: Fix early failure in multiwrite

...er which means the fs driver needs to call file I/O syscall(s) which might block for a long time. Therefore the 9P server leaves the Coroutine at that point * <b>Features</b>: