| Commit message (Collapse) | Author | Age | Files | Lines |
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git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 updates from Vasily Gorbik:
- Add support for ftrace with direct call and ftrace direct call
samples.
- Add support for kernel command lines longer than current 896 bytes
and make its length configurable.
- Add support for BEAR enhancement facility to improve last breaking
event instruction tracking.
- Add kprobes sanity checks and testcases to prevent kprobe in the mid
of an instruction.
- Allow concurrent access to /dev/hwc for the CPUMF users.
- Various ftrace / jump label improvements.
- Convert unwinder tests to KUnit.
- Add s390_iommu_aperture kernel parameter to tweak the limits on
concurrently usable DMA mappings.
- Add ap.useirq AP module option which can be used to disable interrupt
use.
- Add add_disk() error handling support to block device drivers.
- Drop arch specific and use generic implementation of strlcpy and
strrchr.
- Several __pa/__va usages fixes.
- Various cio, crypto, pci, kernel doc and other small fixes and
improvements all over the code.
[ Merge fixup as per https://lore.kernel.org/all/YXAqZ%2FEszRisunQw@osiris/ ]
* tag 's390-5.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (63 commits)
s390: make command line configurable
s390: support command lines longer than 896 bytes
s390/kexec_file: move kernel image size check
s390/pci: add s390_iommu_aperture kernel parameter
s390/spinlock: remove incorrect kernel doc indicator
s390/string: use generic strlcpy
s390/string: use generic strrchr
s390/ap: function rework based on compiler warning
s390/cio: make ccw_device_dma_* more robust
s390/vfio-ap: s390/crypto: fix all kernel-doc warnings
s390/hmcdrv: fix kernel doc comments
s390/ap: new module option ap.useirq
s390/cpumf: Allow multiple processes to access /dev/hwc
s390/bitops: return true/false (not 1/0) from bool functions
s390: add support for BEAR enhancement facility
s390: introduce nospec_uses_trampoline()
s390: rename last_break to pgm_last_break
s390/ptrace: add last_break member to pt_regs
s390/sclp: sort out physical vs virtual pointers usage
s390/setup: convert start and end initrd pointers to virtual
...
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Slight rework of function __ap_revise_reserved()
because of unused variable warning when build with W=1.
This patch introduces an additional debug feature warning
message when device_reprobe() returns with failure.
However, the return value of __ap_revise_reserved()
is still hard coded to 0 as this is a callback function
to be used together with bus_for_each_dev() and thus
the return value indicates to go on with the
bus_for_each_dev() loop and not apport on a failure
of something within this function.
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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Fixes the kernel-doc warnings in the following source files:
* drivers/s390/crypto/vfio_ap_private.h
* drivers/s390/crypto/vfio_ap_drv.c
* drivers/s390/crypto/vfio_ap_ops.c
Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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This patch introduces a new AP module option to be able to
control if the ap bus code is using interrupts or not.
By default if the interrupt support is available it is used.
This option makes it possible to disable interrupt use even
when interrupt support is available.
It should be obvious that this option can't magically enable
interrupt support when the hardware or hypervisor layer does
not support AP interrupts.
On the kernel command line use ap.useirq=0 or ap.useirq=1
to disable or enable (that's the default) interrupt use.
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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This patch reworks all the debug feature invocations to be
more uniform. All invocations now use the macro with the
level already part of the macro name. All messages now start
with %s filled with __func__ (well there are still some
exceptions), and some message text has been shortened or
reworked.
There is no functional code touched with this patch.
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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When a queue is switched to soft offline during heavy load and later
switched to soft online again and now used, it may be that the caller
is blocked forever in the ioctl call.
The failure occurs because there is a pending reply after the queue(s)
have been switched to offline. This orphaned reply is received when
the queue is switched to online and is accidentally counted for the
outstanding replies. So when there was a valid outstanding reply and
this orphaned reply is received it counts as the outstanding one thus
dropping the outstanding counter to 0. Voila, with this counter the
receive function is not called any more and the real outstanding reply
is never received (until another request comes in...) and the ioctl
blocks.
The fix is simple. However, instead of readjusting the counter when an
orphaned reply is detected, I check the queue status for not empty and
compare this to the outstanding counter. So if the queue is not empty
then the counter must not drop to 0 but at least have a value of 1.
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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v5.16/vfio/next
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Reuse the logic in vfio_noiommu_group_alloc to allocate a fake
single-device iommu group for mediated devices by factoring out a common
function, and replacing the noiommu boolean field in struct vfio_group
with an enum to distinguish the three different kinds of groups.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20210924155705.4258-8-hch@lst.de
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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Without this call an xarray entry is leaked when the vfio_ap device is
unprobed. It was missed when the below patch was rebased across the
dev_set patch. Keep the remove function in the same order as the error
unwind in probe.
Fixes: eb0feefd4c02 ("vfio/ap_ops: Convert to use vfio_register_group_dev()")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Tony Krowiak <akrowiak@linux.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
Link: https://lore.kernel.org/r/0-v3-f9b50340cdbb+e4-ap_uninit_jgg@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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Get rid of warnings like:
drivers/s390/crypto/ap_bus.c:216: warning:
bad line:
drivers/s390/crypto/ap_bus.c:444:
warning: Function parameter or member 'floating' not described in 'ap_interrupt_handler'
Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull more s390 updates from Heiko Carstens:
"Except for the xpram device driver removal it is all about fixes and
cleanups.
- Fix topology update on cpu hotplug, so notifiers see expected
masks. This bug was uncovered with SCHED_CORE support.
- Fix stack unwinding so that the correct number of entries are
omitted like expected by common code. This fixes KCSAN selftests.
- Add kmemleak annotation to stack_alloc to avoid false positive
kmemleak warnings.
- Avoid layering violation in common I/O code and don't unregister
subchannel from child-drivers.
- Remove xpram device driver for which no real use case exists since
the kernel is 64 bit only. Also all hypervisors got required
support removed in the meantime, which means the xpram device
driver is dead code.
- Fix -ENODEV handling of clp_get_state in our PCI code.
- Enable KFENCE in debug defconfig.
- Cleanup hugetlbfs s390 specific Kconfig dependency.
- Quite a lot of trivial fixes to get rid of "W=1" warnings, and and
other simple cleanups"
* tag 's390-5.15-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
hugetlbfs: s390 is always 64bit
s390/ftrace: remove incorrect __va usage
s390/zcrypt: remove incorrect kernel doc indicators
scsi: zfcp: fix kernel doc comments
s390/sclp: add __nonstring annotation
s390/hmcdrv_ftp: fix kernel doc comment
s390: remove xpram device driver
s390/pci: read clp_list_pci_req only once
s390/pci: fix clp_get_state() handling of -ENODEV
s390/cio: fix kernel doc comment
s390/ctrlchar: fix kernel doc comment
s390/con3270: use proper type for tasklet function
s390/cpum_cf: move array from header to C file
s390/mm: fix kernel doc comments
s390/topology: fix topology information when calling cpu hotplug notifiers
s390/unwind: use current_frame_address() to unwind current task
s390/configs: enable CONFIG_KFENCE in debug_defconfig
s390/entry: make oklabel within CHKSTG macro local
s390: add kmemleak annotation in stack_alloc()
s390/cio: dont unregister subchannel from child-drivers
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Many comments above functions start with a kernel doc indicator, but
the comments are not using kernel doc style. Get rid of the warnings
by simply removing the indicator.
E.g.:
drivers/s390/crypto/zcrypt_msgtype6.c:111: warning:
This comment starts with '/**', but isn't a kernel-doc comment.
Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
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Pull VFIO updates from Alex Williamson:
- Fix dma-valid return WAITED implementation (Anthony Yznaga)
- SPDX license cleanups (Cai Huoqing)
- Split vfio-pci-core from vfio-pci and enhance PCI driver matching to
support future vendor provided vfio-pci variants (Yishai Hadas, Max
Gurtovoy, Jason Gunthorpe)
- Replace duplicated reflck with core support for managing first open,
last close, and device sets (Jason Gunthorpe, Max Gurtovoy, Yishai
Hadas)
- Fix non-modular mdev support and don't nag about request callback
support (Christoph Hellwig)
- Add semaphore to protect instruction intercept handler and replace
open-coded locks in vfio-ap driver (Tony Krowiak)
- Convert vfio-ap to vfio_register_group_dev() API (Jason Gunthorpe)
* tag 'vfio-v5.15-rc1' of git://github.com/awilliam/linux-vfio: (37 commits)
vfio/pci: Introduce vfio_pci_core.ko
vfio: Use kconfig if XX/endif blocks instead of repeating 'depends on'
vfio: Use select for eventfd
PCI / VFIO: Add 'override_only' support for VFIO PCI sub system
PCI: Add 'override_only' field to struct pci_device_id
vfio/pci: Move module parameters to vfio_pci.c
vfio/pci: Move igd initialization to vfio_pci.c
vfio/pci: Split the pci_driver code out of vfio_pci_core.c
vfio/pci: Include vfio header in vfio_pci_core.h
vfio/pci: Rename ops functions to fit core namings
vfio/pci: Rename vfio_pci_device to vfio_pci_core_device
vfio/pci: Rename vfio_pci_private.h to vfio_pci_core.h
vfio/pci: Rename vfio_pci.c to vfio_pci_core.c
vfio/ap_ops: Convert to use vfio_register_group_dev()
s390/vfio-ap: replace open coded locks for VFIO_GROUP_NOTIFY_SET_KVM notification
s390/vfio-ap: r/w lock for PQAP interception handler function pointer
vfio/type1: Fix vfio_find_dma_valid return
vfio-pci/zdev: Remove repeated verbose license text
vfio: platform: reset: Convert to SPDX identifier
vfio: Remove struct vfio_device_ops open/release
...
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This is straightforward conversion, the ap_matrix_mdev is actually serving
as the vfio_device and we can replace all the mdev_get_drvdata()'s with a
simple container_of() or a dev_get_drvdata() for sysfs paths.
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Cornelia Huck <cohuck@redhat.com>
Cc: kvm@vger.kernel.org
Cc: Christoph Hellwig <hch@lst.de>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/0-v4-0203a4ab0596+f7-vfio_ap_jgg@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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notification
It was pointed out during an unrelated patch review that locks should not
be open coded - i.e., writing the algorithm of a standard lock in a
function instead of using a lock from the standard library. The setting and
testing of a busy flag and sleeping on a wait_event is the same thing
a lock does. The open coded locks are invisible to lockdep, so potential
locking problems are not detected.
This patch removes the open coded locks used during
VFIO_GROUP_NOTIFY_SET_KVM notification. The busy flag
and wait queue were introduced to resolve a possible circular locking
dependency reported by lockdep when starting a secure execution guest
configured with AP adapters and domains. Reversing the order in which
the kvm->lock mutex and matrix_dev->lock mutex are locked resolves the
issue reported by lockdep, thus enabling the removal of the open coded
locks.
Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Acked-by: Halil Pasic <pasic@linux.ibm.com>
Link: https://lore.kernel.org/r/20210823212047.1476436-3-akrowiak@linux.ibm.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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The function pointer to the interception handler for the PQAP instruction
can get changed during the interception process. Let's add a
semaphore to struct kvm_s390_crypto to control read/write access to the
function pointer contained therein.
The semaphore must be locked for write access by the vfio_ap device driver
when notified that the KVM pointer has been set or cleared. It must be
locked for read access by the interception framework when the PQAP
instruction is intercepted.
Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Link: https://lore.kernel.org/r/20210823212047.1476436-2-akrowiak@linux.ibm.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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The user can open multiple device FDs if it likes, however these open()
functions call vfio_register_notifier() on some device global
state. Calling vfio_register_notifier() twice in will trigger a WARN_ON
from notifier_chain_register() and the first close will wrongly delete the
notifier and more.
Since these really want the new open/close_device() semantics just change
the functions over.
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/12-v4-9ea22c5e6afb+1adf-vfio_reflck_jgg@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core updates from Greg KH:
"Here is the big set of driver core patches for 5.15-rc1.
These do change a number of different things across different
subsystems, and because of that, there were 2 stable tags created that
might have already come into your tree from different pulls that did
the following
- changed the bus remove callback to return void
- sysfs iomem_get_mapping rework
Other than those two things, there's only a few small things in here:
- kernfs performance improvements for huge numbers of sysfs users at
once
- tiny api cleanups
- other minor changes
All of these have been in linux-next for a while with no reported
problems, other than the before-mentioned merge issue"
* tag 'driver-core-5.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (33 commits)
MAINTAINERS: Add dri-devel for component.[hc]
driver core: platform: Remove platform_device_add_properties()
ARM: tegra: paz00: Handle device properties with software node API
bitmap: extend comment to bitmap_print_bitmask/list_to_buf
drivers/base/node.c: use bin_attribute to break the size limitation of cpumap ABI
topology: use bin_attribute to break the size limitation of cpumap ABI
lib: test_bitmap: add bitmap_print_bitmask/list_to_buf test cases
cpumask: introduce cpumap_print_list/bitmask_to_buf to support large bitmask and list
sysfs: Rename struct bin_attribute member to f_mapping
sysfs: Invoke iomem_get_mapping() from the sysfs open callback
debugfs: Return error during {full/open}_proxy_open() on rmmod
zorro: Drop useless (and hardly used) .driver member in struct zorro_dev
zorro: Simplify remove callback
sh: superhyway: Simplify check in remove callback
nubus: Simplify check in remove callback
nubus: Make struct nubus_driver::remove return void
kernfs: dont call d_splice_alias() under kernfs node lock
kernfs: use i_lock to protect concurrent inode updates
kernfs: switch kernfs to use an rwsem
kernfs: use VFS negative dentry caching
...
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The driver core ignores the return value of this callback because there
is only little it can do when a device disappears.
This is the final bit of a long lasting cleanup quest where several
buses were converted to also return void from their remove callback.
Additionally some resource leaks were fixed that were caused by drivers
returning an error code in the expectation that the driver won't go
away.
With struct bus_type::remove returning void it's prevented that newly
implemented buses return an ignored error code and so don't anticipate
wrong expectations for driver authors.
Reviewed-by: Tom Rix <trix@redhat.com> (For fpga)
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Cornelia Huck <cohuck@redhat.com> (For drivers/s390 and drivers/vfio)
Acked-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> (For ARM, Amba and related parts)
Acked-by: Mark Brown <broonie@kernel.org>
Acked-by: Chen-Yu Tsai <wens@csie.org> (for sunxi-rsb)
Acked-by: Pali Rohár <pali@kernel.org>
Acked-by: Mauro Carvalho Chehab <mchehab@kernel.org> (for media)
Acked-by: Hans de Goede <hdegoede@redhat.com> (For drivers/platform)
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-By: Vinod Koul <vkoul@kernel.org>
Acked-by: Juergen Gross <jgross@suse.com> (For xen)
Acked-by: Lee Jones <lee.jones@linaro.org> (For mfd)
Acked-by: Johannes Thumshirn <jth@kernel.org> (For mcb)
Acked-by: Johan Hovold <johan@kernel.org>
Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> (For slimbus)
Acked-by: Kirti Wankhede <kwankhede@nvidia.com> (For vfio)
Acked-by: Maximilian Luz <luzmaximilian@gmail.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> (For ulpi and typec)
Acked-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com> (For ipack)
Acked-by: Geoff Levand <geoff@infradead.org> (For ps3)
Acked-by: Yehezkel Bernat <YehezkelShB@gmail.com> (For thunderbolt)
Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> (For intel_th)
Acked-by: Dominik Brodowski <linux@dominikbrodowski.net> (For pcmcia)
Acked-by: Rafael J. Wysocki <rafael@kernel.org> (For ACPI)
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org> (rpmsg and apr)
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> (For intel-ish-hid)
Acked-by: Dan Williams <dan.j.williams@intel.com> (For CXL, DAX, and NVDIMM)
Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> (For isa)
Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (For firewire)
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> (For hid)
Acked-by: Thorsten Scherer <t.scherer@eckelmann.de> (For siox)
Acked-by: Sven Van Asbroeck <TheSven73@gmail.com> (For anybuss)
Acked-by: Ulf Hansson <ulf.hansson@linaro.org> (For MMC)
Acked-by: Wolfram Sang <wsa@kernel.org> # for I2C
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Finn Thain <fthain@linux-m68k.org>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20210713193522.1770306-6-u.kleine-koenig@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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If for any reason the interrupt enable for an ap queue fails the
state machine run for the queue returned wrong return codes to the
caller. So the caller assumed interrupt support for this queue in
enabled and thus did not re-establish the high resolution timer used
for polling. In the end this let to a hang for the user space process
waiting "forever" for the reply.
This patch reworks these return codes to return correct indications
for the caller to re-establish the timer when a queue runs without
interrupt support.
Please note that this is fixing a wrong behavior after a first
failure (enable interrupt support for the queue) failed. However,
looks like this occasionally happens on KVM systems.
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
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The 0day bot reported some kernel-doc warnings in this file so clean up
all of the kernel-doc and use proper kernel-doc formatting.
There are no more kernel-doc errors or warnings reported in this file.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kernel test robot <lkp@intel.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Tony Krowiak <akrowiak@linux.ibm.com>
Cc: Halil Pasic <pasic@linux.ibm.com>
Cc: Jason Herne <jjherne@linux.ibm.com>
Cc: Harald Freudenberger <freude@linux.ibm.com>
Cc: linux-s390@vger.kernel.org
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
Link: https://lore.kernel.org/r/20210806050149.9614-1-rdunlap@infradead.org
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
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As .remove() is only called after a successful .probe() call, we can
trust that the drvdata is valid.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
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The device struct provides a pointer for driver-private data. Use this
in the zcrypt drivers (as vfio_ap already does), and then remove the
custom pointer from the AP device structs.
As really_probe() will always clear the drvdata pointer on error, we
no longer have to do so ourselves.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
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The device struct itself already contains a pointer to its driver.
Use this consistently, instead of duplicating it.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
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Tests showed a mismatch between what the CCA tool reports about
the APKA master key state and what's displayed by the zcrypt dd
in sysfs. After some investigation, we found out that the
documentation which was the source for the zcrypt dd implementation
lacks the listing of 3 fields. So this patch now moves the
evaluation of the APKA master key state to the correct offset.
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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Rework of the ap_dqap() inline function with the dqap inline assembler
invocation and the caller code in ap_queue.c to be able to handle
replies which exceed the receive buffer size.
ap_dqap() now provides two additional parameters to handle together
with the caller the case where a reply in the firmware queue entry
exceeds the given message buffer size. It depends on the caller how to
exactly handle this. The behavior implemented now by ap_sm_recv() in
ap_queue.c is to simple purge this entry from the firmware queue and
let the caller 'receive' a -EMSGSIZE for the request without
delivering any reply data - not even a truncated reply message.
However, the reworked ap_dqap() could now get invoked in a way that
the message is received in multiple parts and the caller assembles the
parts into one reply message.
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Suggested-by: Juergen Christ <jchrist@linux.ibm.com>
Reviewed-by: Juergen Christ <jchrist@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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This patch provides support for new dynamic AP bus message limit
with the existing zcrypt device driver and AP bus core code.
There is support for a new field 'ml' from TAPQ query. The field
gives if != 0 the AP bus limit for this card in 4k chunk units.
The actual message size limit per card is shown as a new read-only
sysfs attribute. The sysfs attribute
/sys/devices/ap/cardxx/max_msg_size
shows the upper limit in bytes used by the AP bus and zcrypt device
driver for requests and replies send to and received from this card.
Currently up to CEX7 support only max 12kB msg size and thus the field
shows 12288 meaning the upper limit of a valid msg for this card is
12kB. Please note that the usable payload is somewhat lower and
depends on the msg type and thus the header struct which is to be
prepended by the zcrypt dd.
The dispatcher responsible for choosing the right card and queue is
aware of the individual card AP bus message limit. So a request is
only assigned to a queue of a card which is able to handle the size of
the request (e.g. a 14kB request will never go to a max 12kB card).
If no such card is found the ioctl will fail with ENODEV.
The reply buffer held by the device driver is determined by the ml
field of the TAPQ for this card. If a response from the card exceeds
this limit however, the response is not truncated but the ioctl for
this request will fail with errno EMSGSIZE to indicate that the device
driver has dropped the response because it would overflow the buffer
limit.
If the request size does not indicate to the dispatcher that an
adapter with extended limit is to be used, a random card will be
chosen when no specific card is addressed (ANY addressing). This may
result in an ioctl failure when the reply size needs an adapter with
extended limit but the randomly chosen one is not capable of handling
the broader reply size. The user space application needs to use
dedicated addressing to forward such a request only to suitable cards
to get requests like this processed properly.
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Ingo Tuchscherer <ingo.tuchscherer@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 updates from Vasily Gorbik:
- Rework inline asm to get rid of error prone "register asm"
constructs, which are problematic especially when code
instrumentation is enabled.
In particular introduce and use register pair union to allocate
even/odd register pairs. Unfortunately this breaks compatibility with
older clang compilers and minimum clang version for s390 has been
raised to 13.
https://lore.kernel.org/linux-next/CAK7LNARuSmPCEy-ak0erPrPTgZdGVypBROFhtw+=3spoGoYsyw@mail.gmail.com/
- Fix gcc 11 warnings, which triggered various minor reworks all over
the code.
- Add zstd kernel image compression support.
- Rework boot CPU lowcore handling.
- De-duplicate and move kernel memory layout setup logic earlier.
- Few fixes in preparation for FORTIFY_SOURCE performing compile-time
and run-time field bounds checking for mem functions.
- Remove broken and unused power management support leftovers in s390
drivers.
- Disable stack-protector for decompressor and purgatory to fix
buildroot build.
- Fix vt220 sclp console name to match the char device name.
- Enable HAVE_IOREMAP_PROT and add zpci_set_irq()/zpci_clear_irq() in
zPCI code.
- Remove some implausible WARN_ON_ONCEs and remove arch specific
counter transaction call backs in favour of default transaction
handling in perf code.
- Extend/add new uevents for online/config/mode state changes of AP
card / queue device in zcrypt.
- Minor entry and ccwgroup code improvements.
- Other small various fixes and improvements all over the code.
* tag 's390-5.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (91 commits)
s390/dasd: use register pair instead of register asm
s390/qdio: get rid of register asm
s390/ioasm: use symbolic names for asm operands
s390/ioasm: get rid of register asm
s390/cmf: get rid of register asm
s390/lib,string: get rid of register asm
s390/lib,uaccess: get rid of register asm
s390/string: get rid of register asm
s390/cmpxchg: use register pair instead of register asm
s390/mm,pages-states: get rid of register asm
s390/lib,xor: get rid of register asm
s390/timex: get rid of register asm
s390/hypfs: use register pair instead of register asm
s390/zcrypt: Switch to flexible array member
s390/speculation: Use statically initialized const for instructions
virtio/s390: get rid of open-coded kvm hypercall
s390/pci: add zpci_set_irq()/zpci_clear_irq()
scripts/min-tool-version.sh: Raise minimum clang version to 13.0.0 for s390
s390/ipl: use register pair instead of register asm
s390/mem_detect: fix tprot() program check new psw handling
...
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In preparation for FORTIFY_SOURCE performing compile-time and run-time
field bounds checking for memcpy(), memmove(), and memset(), avoid
intentionally reading/writing across neighboring array fields.
Switch from zero-element arrays to flexible arrays so the compiler will
perform appropriate bounds checking, avoiding these future warnings:
In function '__fortify_memcpy',
inlined from 'cca_sec2protkey' at drivers/s390/crypto/zcrypt_ccamisc.c:645:2:
./include/linux/fortify-string.h:244:4: error: call to '__write_overflow_field' declared with attribute error: detected write beyond size of field (1st parameter)
In function '__fortify_memcpy',
inlined from 'cca_clr2seckey' at drivers/s390/crypto/zcrypt_ccamisc.c:568:3:
./include/linux/fortify-string.h:246:4: error: call to '__read_overflow2_field' declared with attribute error: detected read beyond size of field (2nd parameter)
In function '__fortify_memcpy',
inlined from 'cca_genseckey' at drivers/s390/crypto/zcrypt_ccamisc.c:429:2:
./include/linux/fortify-string.h:246:4: error: call to '__read_overflow2_field' declared with attribute error: detected read beyond size of field (2nd parameter)
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210616201903.1245949-1-keescook@chromium.org
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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This patch brings 3 reworked/new uevent changes:
* All AP uevents caused by an ap card or queue device now carry an
additional uevent env value MODE=<accel|cca|ep11>. Here is an
example:
KERNEL[1267.301292] add /devices/ap/card0a (ap)
ACTION=add
DEVPATH=/devices/ap/card0a
SUBSYSTEM=ap
DEVTYPE=ap_card
DEV_TYPE=000D
MODALIAS=ap:t0D
MODE=ep11 <- this is new
SEQNUM=1095
This is true for bind, unbind, add, remove, and change uevents
related to ap card or ap queue devices.
* On a change of the soft online attribute on a zcrypt queue or card
device a new CHANGE uevent is sent with an env value ONLINE=<0|1>.
Example uevent:
KERNEL[613.067531] change /devices/ap/card09/09.0011 (ap)
ACTION=change
DEVPATH=/devices/ap/card09/09.0011
SUBSYSTEM=ap
ONLINE=0 <- this is new
DEVTYPE=ap_queue
DRIVER=cex4queue
MODE=cca
SEQNUM=1070
- On a change of the config state of an zcrypt card device a new
CHANGE uevent is sent with an env value CONFIG=<0|1>.
Example uevent:
KERNEL[876.258680] change /devices/ap/card09 (ap)
ACTION=change
DEVPATH=/devices/ap/card09
SUBSYSTEM=ap
CONFIG=0 <- this is new
DEVTYPE=ap_card
DRIVER=cex4card
DEV_TYPE=000D
MODALIAS=ap:t0D
MODE=cca
SEQNUM=1073
Setting a card config on/off causes the dependent queue devices to
follow the config state change and thus uevents informing about the
config state change for the queue devices are also emitted.
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Ingo Franzki <ifranzki@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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Define & initialize the driver struct in one go, so that everything
is in one place.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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Userspace udev rules need an indication about the very first AP change
BINDINGS=complete uevent.
So now this uevent is extend with an additional key-value entry
COMPLETECOUNT=<counter>. The very first uevent will show counter=1 and
the following BINDINGS=complete uevents increase this counter by 1.
Here is an example how the very first BINDINGS=complete uevent
looks like:
KERNEL[106.079510] change /devices/ap (ap)
ACTION=change
DEVPATH=/devices/ap
SUBSYSTEM=ap
BINDINGS=complete
COMPLETECOUNT=1
SEQNUM=10686
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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Hijacking the device_driver's probe/remove callbacks for purely
bus-internal logic is a very unconvential construct. Instead just set
up our callbacks in the AP bus struct, and really_probe() will call them
in the same way as before.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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It's evidently unused.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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gcc-11 warns:
drivers/s390/crypto/zcrypt_ccamisc.c:298:38: warning: argument 4 of type u8[64] {aka unsigned char[64]} with mismatched bound [-Warray-parameter=]
298 | u32 keybitsize, u8 seckey[SECKEYBLOBSIZE])
| ~~~^~~~~~~~~~~~~~~~~~~~~~
In file included from drivers/s390/crypto/zcrypt_ccamisc.c:24:
drivers/s390/crypto/zcrypt_ccamisc.h:162:63: note: previously declared as u8 * {aka unsigned char *}
162 | int cca_genseckey(u16 cardnr, u16 domain, u32 keybitsize, u8 *seckey);
| ~~~~^~~~~~
drivers/s390/crypto/zcrypt_ccamisc.c:441:41: warning: argument 5 of type u8[64] {aka unsigned char[64]} with mismatched bound [-Warray-parameter=]
441 | const u8 *clrkey, u8 seckey[SECKEYBLOBSIZE])
| ~~~^~~~~~~~~~~~~~~~~~~~~~
In file included from drivers/s390/crypto/zcrypt_ccamisc.c:24:
drivers/s390/crypto/zcrypt_ccamisc.h:168:42: note: previously declared as u8 * {aka unsigned char *}
168 | const u8 *clrkey, u8 *seckey);
| ~~~~^~~~~~
Fix this by making the prototypes match the functions.
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Cc: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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The mdev remove callback for the vfio_ap device driver bails out with
-EBUSY if the mdev is in use by a KVM guest (i.e., the KVM pointer in the
struct ap_matrix_mdev is not NULL). The intended purpose was
to prevent the mdev from being removed while in use. There are two
problems with this scenario:
1. Returning a non-zero return code from the remove callback does not
prevent the removal of the mdev.
2. The KVM pointer in the struct ap_matrix_mdev will always be NULL because
the remove callback will not get invoked until the mdev fd is closed.
When the mdev fd is closed, the mdev release callback is invoked and
clears the KVM pointer from the struct ap_matrix_mdev.
Let's go ahead and remove the check for KVM in the remove callback and
allow the cleanup of mdev resources to proceed.
Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20210609224634.575156-2-akrowiak@linux.ibm.com
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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When a AP queue is switched to soft offline, all pending
requests are purged out of the pending requests list and
'received' by the upper layer like zcrypt device drivers.
This is also done for requests which are already enqueued
into the firmware queue. A request in a firmware queue
may eventually produce an response message, but there is
no waiting process any more. However, the response was
counted with the queue_counter and as this counter was
reset to 0 with the offline switch, the pending response
caused the queue_counter to get negative. The next request
increased this counter to 0 (instead of 1) which caused
the ap code to assume there is nothing to receive and so
the response for this valid request was never tried to
fetch from the firmware queue.
This all caused a queue to not work properly after a
switch offline/online and in the end processes to hang
forever when trying to send a crypto request after an
queue offline/online switch cicle.
Fixed by a) making sure the counter does not drop below 0
and b) on a successful enqueue of a message has at least
a value of 1.
Additionally a warning is emitted, when a reply can't get
assigned to a waiting process. This may be normal operation
(process had timeout or has been killed) but may give a
hint that something unexpected happened (like this odd
behavior described above).
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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Pull VFIO updates from Alex Williamson:
- Embed struct vfio_device into vfio driver structures (Jason
Gunthorpe)
- Make vfio_mdev type safe (Jason Gunthorpe)
- Remove vfio-pci NVLink2 extensions for POWER9 (Christoph Hellwig)
- Update vfio-pci IGD extensions for OpRegion 2.1+ (Fred Gao)
- Various spelling/blank line fixes (Zhen Lei, Zhou Wang, Bhaskar
Chowdhury)
- Simplify unpin_pages error handling (Shenming Lu)
- Fix i915 mdev Kconfig dependency (Arnd Bergmann)
- Remove unused structure member (Keqian Zhu)
* tag 'vfio-v5.13-rc1' of git://github.com/awilliam/linux-vfio: (43 commits)
vfio/gvt: fix DRM_I915_GVT dependency on VFIO_MDEV
vfio/iommu_type1: Remove unused pinned_page_dirty_scope in vfio_iommu
vfio/mdev: Correct the function signatures for the mdev_type_attributes
vfio/mdev: Remove kobj from mdev_parent_ops->create()
vfio/gvt: Use mdev_get_type_group_id()
vfio/gvt: Make DRM_I915_GVT depend on VFIO_MDEV
vfio/mbochs: Use mdev_get_type_group_id()
vfio/mdpy: Use mdev_get_type_group_id()
vfio/mtty: Use mdev_get_type_group_id()
vfio/mdev: Add mdev/mtype_get_type_group_id()
vfio/mdev: Remove duplicate storage of parent in mdev_device
vfio/mdev: Add missing error handling to dev_set_name()
vfio/mdev: Reorganize mdev_device_create()
vfio/mdev: Add missing reference counting to mdev_type
vfio/mdev: Expose mdev_get/put_parent to mdev_private.h
vfio/mdev: Use struct mdev_type in struct mdev_device
vfio/mdev: Simplify driver registration
vfio/mdev: Add missing typesafety around mdev_device
vfio/mdev: Do not allow a mdev_type to have a NULL parent pointer
vfio/mdev: Fix missing static's on MDEV_TYPE_ATTR's
...
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The driver core standard is to pass in the properly typed object, the
properly typed attribute and the buffer data. It stems from the root
kobject method:
ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr,..)
Each subclass of kobject should provide their own function with the same
signature but more specific types, eg struct device uses:
ssize_t (*show)(struct device *dev, struct device_attribute *attr,..)
In this case the existing signature is:
ssize_t (*show)(struct kobject *kobj, struct device *dev,..)
Where kobj is a 'struct mdev_type *' and dev is 'mdev_type->parent->dev'.
Change the mdev_type related sysfs attribute functions to:
ssize_t (*show)(struct mdev_type *mtype, struct mdev_type_attribute *attr,..)
In order to restore type safety and match the driver core standard
There are no current users of 'attr', but if it is ever needed it would be
hard to add in retroactively, so do it now.
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Message-Id: <18-v2-d36939638fc6+d54-vfio2_jgg@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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The kobj here is a type-erased version of mdev_type, which is already
stored in the struct mdev_device being passed in. It was only ever used to
compute the type_group_id, which is now extracted directly from the mdev.
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Message-Id: <17-v2-d36939638fc6+d54-vfio2_jgg@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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Tests with kvm and a kmemdebug kernel showed, that on hot unplug the
zcard and zqueue structs for the unplugged card or queue are not
properly freed because of a mismatch with get/put for the embedded
kref counter.
This fix now adjusts the handling of the kref counters. With init the
kref counter starts with 1. This initial value needs to drop to zero
with the unregister of the card or queue to trigger the release and
free the object.
Fixes: 29c2680fd2bf ("s390/ap: fix ap devices reference counting")
Reported-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Cc: stable@vger.kernel.org
Reviewed-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
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This patch fixes a lockdep splat introduced by commit f21916ec4826
("s390/vfio-ap: clean up vfio_ap resources when KVM pointer invalidated").
The lockdep splat only occurs when starting a Secure Execution guest.
Crypto virtualization (vfio_ap) is not yet supported for SE guests;
however, in order to avoid this problem when support becomes available,
this fix is being provided.
The circular locking dependency was introduced when the setting of the
masks in the guest's APCB was executed while holding the matrix_dev->lock.
While the lock is definitely needed to protect the setting/unsetting of the
matrix_mdev->kvm pointer, it is not necessarily critical for setting the
masks; so, the matrix_dev->lock will be released while the masks are being
set or cleared.
Keep in mind, however, that another process that takes the matrix_dev->lock
can get control while the masks in the guest's APCB are being set or
cleared as a result of the driver being notified that the KVM pointer
has been set or unset. This could result in invalid access to the
matrix_mdev->kvm pointer by the intervening process. To avoid this
scenario, two new fields are being added to the ap_matrix_mdev struct:
struct ap_matrix_mdev {
...
bool kvm_busy;
wait_queue_head_t wait_for_kvm;
...
};
The functions that handle notification that the KVM pointer value has
been set or cleared will set the kvm_busy flag to true until they are done
processing at which time they will set it to false and wake up the tasks on
the matrix_mdev->wait_for_kvm wait queue. Functions that require
access to matrix_mdev->kvm will sleep on the wait queue until they are
awakened at which time they can safely access the matrix_mdev->kvm
field.
Fixes: f21916ec4826 ("s390/vfio-ap: clean up vfio_ap resources when KVM pointer invalidated")
Cc: stable@vger.kernel.org
Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
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The copy_to_user() function returns the number of bytes remaining to be
copied, but we want to return -EFAULT if the copy doesn't complete.
Fixes: e06670c5fe3b ("s390: vfio-ap: implement VFIO_DEVICE_GET_INFO ioctl")
Signed-off-by: Wang Qing <wangqing@vivo.com>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Link: https://lore.kernel.org/r/1614600502-16714-1-git-send-email-wangqing@vivo.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 updates from Vasily Gorbik:
- Convert to using the generic entry infrastructure.
- Add vdso time namespace support.
- Switch s390 and alpha to 64-bit ino_t. As discussed at
https://lore.kernel.org/linux-mm/YCV7QiyoweJwvN+m@osiris/
- Get rid of expensive stck (store clock) usages where possible.
Utilize cpu alternatives to patch stckf when supported.
- Make tod_clock usage less error prone by converting it to a union and
rework code which is using it.
- Machine check handler fixes and cleanups.
- Drop couple of minor inline asm optimizations to fix clang build.
- Default configs changes notably to make libvirt happy.
- Various changes to rework and improve qdio code.
- Other small various fixes and improvements all over the code.
* tag 's390-5.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (68 commits)
s390/qdio: remove 'merge_pending' mechanism
s390/qdio: improve handling of PENDING buffers for QEBSM devices
s390/qdio: rework q->qdio_error indication
s390/qdio: inline qdio_kick_handler()
s390/time: remove get_tod_clock_ext()
s390/crypto: use store_tod_clock_ext()
s390/hypfs: use store_tod_clock_ext()
s390/debug: use union tod_clock
s390/kvm: use union tod_clock
s390/vdso: use union tod_clock
s390/time: convert tod_clock_base to union
s390/time: introduce new store_tod_clock_ext()
s390/time: rename store_tod_clock_ext() and use union tod_clock
s390/time: introduce union tod_clock
s390,alpha: switch to 64-bit ino_t
s390: split cleanup_sie
s390: use r13 in cleanup_sie as temp register
s390: fix kernel asce loading when sie is interrupted
s390: add stack for machine check handler
s390: use WRITE_ONCE when re-allocating async stack
...
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When a msg is retried because the lower ap layer returns -EAGAIN
there is a retry limit (currently 10). When this limit is reached
the last return code from the lower layer is returned, causing
the userspace to get -1 on the ioctl with errno EAGAIN.
This EAGAIN is misleading here. After 10 retry attempts the
userspace should receive a clear failure indication like EINVAL
or EIO or ENODEV. However, the reason why these retries all
fail is unclear. On an invalid message EINVAL would be returned
by the lower layer, and if devices go away or are not available
an ENODEV is seen. So this patch now reworks the retry loops
to return EIO to userspace when the retry limit is reached.
Fixes: 91ffc519c199 ("s390/zcrypt: introduce msg tracking in zcrypt functions")
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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A master key change on a CCA card may cause an immediately
following request to derive an protected key from a secure
key to fail with error condition 8/2290. The recommendation
from firmware is to retry with 1 second sleep.
So now the low level cca functions return -EAGAIN when this
error condition is seen and the paes retry function will
evaluate the return value. Seeing EAGAIN and running in
process context results in trying to sleep for 1 s now.
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Ingo Franzki <ifranzki@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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The queues assigned to a matrix mediated device are currently reset when:
* The VFIO_DEVICE_RESET ioctl is invoked
* The mdev fd is closed by userspace (QEMU)
* The mdev is removed from sysfs.
Immediately after the reset of a queue, a call is made to disable
interrupts for the queue. This is entirely unnecessary because the reset of
a queue disables interrupts, so this will be removed.
Furthermore, vfio_ap_irq_disable() does an unconditional PQAP/AQIC which
can result in a specification exception (when the corresponding facility
is not available), so this is actually a bugfix.
Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
[pasic@linux.ibm.com: minor rework before merging]
Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Fixes: ec89b55e3bce ("s390: ap: implement PAPQ AQIC interception in kernel")
Cc: <stable@vger.kernel.org>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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The vfio_ap device driver registers a group notifier with VFIO when the
file descriptor for a VFIO mediated device for a KVM guest is opened to
receive notification that the KVM pointer is set (VFIO_GROUP_NOTIFY_SET_KVM
event). When the KVM pointer is set, the vfio_ap driver takes the
following actions:
1. Stashes the KVM pointer in the vfio_ap_mdev struct that holds the state
of the mediated device.
2. Calls the kvm_get_kvm() function to increment its reference counter.
3. Sets the function pointer to the function that handles interception of
the instruction that enables/disables interrupt processing.
4. Sets the masks in the KVM guest's CRYCB to pass AP resources through to
the guest.
In order to avoid memory leaks, when the notifier is called to receive
notification that the KVM pointer has been set to NULL, the vfio_ap device
driver should reverse the actions taken when the KVM pointer was set.
Fixes: 258287c994de ("s390: vfio-ap: implement mediated device open callback")
Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20201223012013.5418-1-akrowiak@linux.ibm.com
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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Replace a comma between expression statements by a semicolon.
Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com>
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
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Instead of creating the sysfs attributes for the AP bus by hand,
describe them in .bus_groups and let the driver core handle it.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-my: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
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