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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2024-09-28 09:11:46 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2024-09-28 09:11:46 -0700 |
| commit | e08d227840bb9366c6321ae1e480b37ba5eec29b (patch) | |
| tree | 939babbab74697d3dc1c855ce269865fad34d822 /Documentation/arch/s390/vfio-ap.rst | |
| parent | 6f81a446f86106c68630032e114024ec7a557077 (diff) | |
| parent | 2d8721364ce83956d0a184a64052928589ef15df (diff) | |
Merge tag 's390-6.12-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull more s390 updates from Vasily Gorbik:
- Clean up and improve vdso code: use SYM_* macros for function and
data annotations, add CFI annotations to fix GDB unwinding, optimize
the chacha20 implementation
- Add vfio-ap driver feature advertisement for use by libvirt and
mdevctl
* tag 's390-6.12-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/vfio-ap: Driver feature advertisement
s390/vdso: Use one large alternative instead of an alternative branch
s390/vdso: Use SYM_DATA_START_LOCAL()/SYM_DATA_END() for data objects
tools: Add additional SYM_*() stubs to linkage.h
s390/vdso: Use macros for annotation of asm functions
s390/vdso: Add CFI annotations to __arch_chacha20_blocks_nostack()
s390/vdso: Fix comment within __arch_chacha20_blocks_nostack()
s390/vdso: Get rid of permutation constants
Diffstat (limited to 'Documentation/arch/s390/vfio-ap.rst')
| -rw-r--r-- | Documentation/arch/s390/vfio-ap.rst | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/Documentation/arch/s390/vfio-ap.rst b/Documentation/arch/s390/vfio-ap.rst index ea744cbc8687..eba1991fbdba 100644 --- a/Documentation/arch/s390/vfio-ap.rst +++ b/Documentation/arch/s390/vfio-ap.rst @@ -999,6 +999,36 @@ the vfio_ap mediated device to which it is assigned as long as each new APQN resulting from plugging it in references a queue device bound to the vfio_ap device driver. +Driver Features +=============== +The vfio_ap driver exposes a sysfs file containing supported features. +This exists so third party tools (like Libvirt and mdevctl) can query the +availability of specific features. + +The features list can be found here: /sys/bus/matrix/devices/matrix/features + +Entries are space delimited. Each entry consists of a combination of +alphanumeric and underscore characters. + +Example: +cat /sys/bus/matrix/devices/matrix/features +guest_matrix dyn ap_config + +the following features are advertised: + +---------------+---------------------------------------------------------------+ +| Flag | Description | ++==============+===============================================================+ +| guest_matrix | guest_matrix attribute exists. It reports the matrix of | +| | adapters and domains that are or will be passed through to a | +| | guest when the mdev is attached to it. | ++--------------+---------------------------------------------------------------+ +| dyn | Indicates hot plug/unplug of AP adapters, domains and control | +| | domains for a guest to which the mdev is attached. | ++------------+-----------------------------------------------------------------+ +| ap_config | ap_config interface for one-shot modifications to mdev config | ++--------------+---------------------------------------------------------------+ + Limitations =========== Live guest migration is not supported for guests using AP devices without |