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* 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>: