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Merge tag 'io_uring-5.13-2021-06-12' of git://git.kernel.dk/linux-block
Pull io_uring fixes from Jens Axboe:
"Just an API change for the registration changes that went into this
release. Better to get it sorted out now than before it's too late"
* tag 'io_uring-5.13-2021-06-12' of git://git.kernel.dk/linux-block:
io_uring: add feature flag for rsrc tags
io_uring: change registration/upd/rsrc tagging ABI
This was reverted in ee6918c6f7 due to conflicts with
upstream, this first patch is just the minimum necessary to make the netfilter
IDLETIMER target with --send_nl_msg load successfully:
phone-5.10:/ # iptables-save | egrep IDLETIMER
-A idletimer_raw_PREROUTING -i rmnet0 -j IDLETIMER --timeout 10 --label 0 --send_nl_msg
-A idletimer_mangle_POSTROUTING -o rmnet0 -j IDLETIMER --timeout 10 --label 0 --send_nl_msg
phone-5.10:/ # ip6tables-save | egrep IDLETIMER
-A idletimer_raw_PREROUTING -i rmnet0 -j IDLETIMER --timeout 10 --label 0 --send_nl_msg
-A idletimer_mangle_POSTROUTING -o rmnet0 -j IDLETIMER --timeout 10 --label 0 --send_nl_msg
Test: builds, and kernel net tests passes, booted on phone, observed ip{,6}tables loading rules
Bug: 183485987
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I1fe2c4e41a092cc82c3d6d49d1217798b2728bcb
(cherry picked from commit b4355a880a)
Add IORING_FEAT_RSRC_TAGS indicating that io_uring supports a bunch of
new IORING_REGISTER operations, in particular
IORING_REGISTER_[FILES[,UPDATE]2,BUFFERS[2,UPDATE]] that support rsrc
tagging, and also indicating implemented dynamic fixed buffer updates.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/9b995d4045b6c6b4ab7510ca124fd25ac2203af7.1623339162.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
There are ABI moments about recently added rsrc registration/update and
tagging that might become a nuisance in the future. First,
IORING_REGISTER_RSRC[_UPD] hide different types of resources under it,
so breaks fine control over them by restrictions. It works for now, but
once those are wanted under restrictions it would require a rework.
It was also inconvenient trying to fit a new resource not supporting
all the features (e.g. dynamic update) into the interface, so better
to return to IORING_REGISTER_* top level dispatching.
Second, register/update were considered to accept a type of resource,
however that's not a good idea because there might be several ways of
registration of a single resource type, e.g. we may want to add
non-contig buffers or anything more exquisite as dma mapped memory.
So, remove IORING_RSRC_[FILE,BUFFER] out of the ABI, and place them
internally for now to limit changes.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/9b554897a7c17ad6e3becc48dfed2f7af9f423d5.1623339162.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
netfilter and wireguard trees.
The bpf vs lockdown+audit fix is the most notable.
Current release - regressions:
- virtio-net: fix page faults and crashes when XDP is enabled
- mlx5e: fix HW timestamping with CQE compression, and make sure they
are only allowed to coexist with capable devices
- stmmac:
- fix kernel panic due to NULL pointer dereference of mdio_bus_data
- fix double clk unprepare when no PHY device is connected
Current release - new code bugs:
- mt76: a few fixes for the recent MT7921 devices and runtime
power management
Previous releases - regressions:
- ice: - track AF_XDP ZC enabled queues in bitmap to fix copy mode Tx
- fix allowing VF to request more/less queues via virtchnl
- correct supported and advertised autoneg by using PHY capabilities
- allow all LLDP packets from PF to Tx
- kbuild: quote OBJCOPY var to avoid a pahole call break the build
Previous releases - always broken:
- bpf, lockdown, audit: fix buggy SELinux lockdown permission checks
- mt76: address the recent FragAttack vulnerabilities not covered
by generic fixes
- ipv6: fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions
- Bluetooth:
- fix the erroneous flush_work() order, to avoid double free
- use correct lock to prevent UAF of hdev object
- nfc: fix NULL ptr dereference in llcp_sock_getname() after failed connect
- ieee802154: multiple fixes to error checking and return values
- igb: fix XDP with PTP enabled
- intel: add correct exception tracing for XDP
- tls: fix use-after-free when TLS offload device goes down and back up
- ipvs: ignore IP_VS_SVC_F_HASHED flag when adding service
- netfilter: nft_ct: skip expectations for confirmed conntrack
- mptcp: fix falling back to TCP in presence of out of order packets
early in connection lifetime
- wireguard: switch from O(n) to a O(1) algorithm for maintaining peers,
fixing stalls and a large memory leak in the process
Misc:
- devlink: correct VIRTUAL port to not have phys_port attributes
- Bluetooth: fix VIRTIO_ID_BT assigned number
- net: return the correct errno code ENOBUF -> ENOMEM
- wireguard:
- peer: allocate in kmem_cache saving 25% on peer memory
- do not use -O3
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Merge tag 'net-5.13-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Pull networking fixes from Jakub Kicinski:
"Networking fixes, including fixes from bpf, wireless, netfilter and
wireguard trees.
The bpf vs lockdown+audit fix is the most notable.
Things haven't slowed down just yet, both in terms of regressions in
current release and largish fixes for older code, but we usually see a
slowdown only after -rc5.
Current release - regressions:
- virtio-net: fix page faults and crashes when XDP is enabled
- mlx5e: fix HW timestamping with CQE compression, and make sure they
are only allowed to coexist with capable devices
- stmmac:
- fix kernel panic due to NULL pointer dereference of
mdio_bus_data
- fix double clk unprepare when no PHY device is connected
Current release - new code bugs:
- mt76: a few fixes for the recent MT7921 devices and runtime power
management
Previous releases - regressions:
- ice:
- track AF_XDP ZC enabled queues in bitmap to fix copy mode Tx
- fix allowing VF to request more/less queues via virtchnl
- correct supported and advertised autoneg by using PHY
capabilities
- allow all LLDP packets from PF to Tx
- kbuild: quote OBJCOPY var to avoid a pahole call break the build
Previous releases - always broken:
- bpf, lockdown, audit: fix buggy SELinux lockdown permission checks
- mt76: address the recent FragAttack vulnerabilities not covered by
generic fixes
- ipv6: fix KASAN: slab-out-of-bounds Read in
fib6_nh_flush_exceptions
- Bluetooth:
- fix the erroneous flush_work() order, to avoid double free
- use correct lock to prevent UAF of hdev object
- nfc: fix NULL ptr dereference in llcp_sock_getname() after failed
connect
- ieee802154: multiple fixes to error checking and return values
- igb: fix XDP with PTP enabled
- intel: add correct exception tracing for XDP
- tls: fix use-after-free when TLS offload device goes down and back
up
- ipvs: ignore IP_VS_SVC_F_HASHED flag when adding service
- netfilter: nft_ct: skip expectations for confirmed conntrack
- mptcp: fix falling back to TCP in presence of out of order packets
early in connection lifetime
- wireguard: switch from O(n) to a O(1) algorithm for maintaining
peers, fixing stalls and a large memory leak in the process
Misc:
- devlink: correct VIRTUAL port to not have phys_port attributes
- Bluetooth: fix VIRTIO_ID_BT assigned number
- net: return the correct errno code ENOBUF -> ENOMEM
- wireguard:
- peer: allocate in kmem_cache saving 25% on peer memory
- do not use -O3"
* tag 'net-5.13-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (91 commits)
cxgb4: avoid link re-train during TC-MQPRIO configuration
sch_htb: fix refcount leak in htb_parent_to_leaf_offload
wireguard: allowedips: free empty intermediate nodes when removing single node
wireguard: allowedips: allocate nodes in kmem_cache
wireguard: allowedips: remove nodes in O(1)
wireguard: allowedips: initialize list head in selftest
wireguard: peer: allocate in kmem_cache
wireguard: use synchronize_net rather than synchronize_rcu
wireguard: do not use -O3
wireguard: selftests: make sure rp_filter is disabled on vethc
wireguard: selftests: remove old conntrack kconfig value
virtchnl: Add missing padding to virtchnl_proto_hdrs
ice: Allow all LLDP packets from PF to Tx
ice: report supported and advertised autoneg using PHY capabilities
ice: handle the VF VSI rebuild failure
ice: Fix VFR issues for AVF drivers that expect ATQLEN cleared
ice: Fix allowing VF to request more/less queues via virtchnl
virtio-net: fix for skb_over_panic inside big mode
ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions
fib: Return the correct errno code
...
- Fixes UAF and CVE-2021-3564
- Fix VIRTIO_ID_BT to use an unassigned ID
- Fix firmware loading on some Intel Controllers
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Merge tag 'for-net-2021-06-03' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth
bluetooth pull request for net:
- Fixes UAF and CVE-2021-3564
- Fix VIRTIO_ID_BT to use an unassigned ID
- Fix firmware loading on some Intel Controllers
Signed-off-by: David S. Miller <davem@davemloft.net>
It turned out that the VIRTIO_ID_* are not assigned in the virtio_ids.h
file in the upstream kernel. Picking the next free one was wrong and
there is a process that has been followed now.
See https://github.com/oasis-tcs/virtio-spec/issues/108 for details.
Fixes: afd2daa26c ("Bluetooth: Add support for virtio transport driver")
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Pull HID fixes from Jiri Kosina:
- memory leak fix in usbhid from Anirudh Rayabharam
- additions for a few new recognized generic key IDs from Dmitry
Torokhov
- Asus T101HA and Dell K15A quirks from Hans de Goede
- memory leak fix in amd_sfh from Basavaraj Natikar
- Win8 compatibility and Stylus fixes in multitouch driver from
Ahelenia Ziemiańska
- NULL pointer dereference fix in hid-magicmouse from Johan Hovold
- assorted other small fixes and device ID additions
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid: (33 commits)
HID: asus: Cleanup Asus T101HA keyboard-dock handling
HID: magicmouse: fix NULL-deref on disconnect
HID: intel-ish-hid: ipc: Add Alder Lake device IDs
HID: i2c-hid: fix format string mismatch
HID: amd_sfh: Fix memory leak in amd_sfh_work
HID: amd_sfh: Use devm_kzalloc() instead of kzalloc()
HID: ft260: improve error handling of ft260_hid_feature_report_get()
HID: magicmouse: fix crash when disconnecting Magic Trackpad 2
HID: gt683r: add missing MODULE_DEVICE_TABLE
HID: pidff: fix error return code in hid_pidff_init()
HID: logitech-hidpp: initialize level variable
HID: multitouch: Disable event reporting on suspend on the Asus T101HA touchpad
HID: core: Remove extraneous empty line before EXPORT_SYMBOL_GPL(hid_check_keys_pressed)
HID: hid-sensor-custom: Process failure of sensor_hub_set_feature()
HID: i2c-hid: Skip ELAN power-on command after reset
HID: usbhid: fix info leak in hid_submit_ctrl
HID: Add BUS_VIRTUAL to hid_connect logging
HID: multitouch: set Stylus suffix for Stylus-application devices, too
HID: multitouch: require Finger field to mark Win8 reports as MT
HID: remove the unnecessary redefinition of a macro
...
* Another state update on exit to userspace fix
* Prevent the creation of mixed 32/64 VMs
* Fix regression with irqbypass not restarting the guest on failed connect
* Fix regression with debug register decoding resulting in overlapping access
* Commit exception state on exit to usrspace
* Fix the MMU notifier return values
* Add missing 'static' qualifiers in the new host stage-2 code
x86 fixes:
* fix guest missed wakeup with assigned devices
* fix WARN reported by syzkaller
* do not use BIT() in UAPI headers
* make the kvm_amd.avic parameter bool
PPC fixes:
* make halt polling heuristics consistent with other architectures
selftests:
* various fixes
* new performance selftest memslot_perf_test
* test UFFD minor faults in demand_paging_test
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull KVM fixes from Paolo Bonzini:
"ARM fixes:
- Another state update on exit to userspace fix
- Prevent the creation of mixed 32/64 VMs
- Fix regression with irqbypass not restarting the guest on failed
connect
- Fix regression with debug register decoding resulting in
overlapping access
- Commit exception state on exit to usrspace
- Fix the MMU notifier return values
- Add missing 'static' qualifiers in the new host stage-2 code
x86 fixes:
- fix guest missed wakeup with assigned devices
- fix WARN reported by syzkaller
- do not use BIT() in UAPI headers
- make the kvm_amd.avic parameter bool
PPC fixes:
- make halt polling heuristics consistent with other architectures
selftests:
- various fixes
- new performance selftest memslot_perf_test
- test UFFD minor faults in demand_paging_test"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (44 commits)
selftests: kvm: fix overlapping addresses in memslot_perf_test
KVM: X86: Kill off ctxt->ud
KVM: X86: Fix warning caused by stale emulation context
KVM: X86: Use kvm_get_linear_rip() in single-step and #DB/#BP interception
KVM: x86/mmu: Fix comment mentioning skip_4k
KVM: VMX: update vcpu posted-interrupt descriptor when assigning device
KVM: rename KVM_REQ_PENDING_TIMER to KVM_REQ_UNBLOCK
KVM: x86: add start_assignment hook to kvm_x86_ops
KVM: LAPIC: Narrow the timer latency between wait_lapic_expire and world switch
selftests: kvm: do only 1 memslot_perf_test run by default
KVM: X86: Use _BITUL() macro in UAPI headers
KVM: selftests: add shared hugetlbfs backing source type
KVM: selftests: allow using UFFD minor faults for demand paging
KVM: selftests: create alias mappings when using shared memory
KVM: selftests: add shmem backing source type
KVM: selftests: refactor vm_mem_backing_src_type flags
KVM: selftests: allow different backing source types
KVM: selftests: compute correct demand paging size
KVM: selftests: simplify setup_demand_paging error handling
KVM: selftests: Print a message if /dev/kvm is missing
...
The initial FUSE passthrough interface has the issue of introducing an
ioctl which receives as a parameter a data structure containing a
pointer. What happens is that, depending on the architecture, the size
of this struct might change, and especially for 32-bit userspace running
on 64-bit kernel, the size mismatch results into different a single
ioctl the behavior of which depends on the data that is passed (e.g.,
with an enum). This is just a poor ioctl design as mentioned by Arnd
Bergmann [1].
Introduce the new FUSE_PASSTHROUGH_OPEN ioctl which only gets the fd of
the lower file system, which is a fixed-size __u32, dropping the
confusing fuse_passthrough_out data structure.
[1] https://lore.kernel.org/lkml/CAK8P3a2K2FzPvqBYL9W=Yut58SFXyetXwU4Fz50G5O3TsS0pPQ@mail.gmail.com/
Bug: 175195837
Signed-off-by: Alessio Balsini <balsini@google.com>
Change-Id: I486d71cbe20f3c0c87544fa75da4e2704fe57c7c
Replace BIT() in KVM's UPAI header with _BITUL(). BIT() is not defined
in the UAPI headers and its usage may cause userspace build errors.
Fixes: fb04a1eddb ("KVM: X86: Implement ring-based dirty memory tracking")
Signed-off-by: Joe Richey <joerichey@google.com>
Message-Id: <20210521085849.37676-3-joerichey94@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Pull siginfo fix from Eric Biederman:
"During the merge window an issue with si_perf and the siginfo ABI came
up. The alpha and sparc siginfo structure layout had changed with the
addition of SIGTRAP TRAP_PERF and the new field si_perf.
The reason only alpha and sparc were affected is that they are the
only architectures that use si_trapno.
Looking deeper it was discovered that si_trapno is used for only a few
select signals on alpha and sparc, and that none of the other
_sigfault fields past si_addr are used at all. Which means technically
no regression on alpha and sparc.
While the alignment concerns might be dismissed the abuse of si_errno
by SIGTRAP TRAP_PERF does have the potential to cause regressions in
existing userspace.
While we still have time before userspace starts using and depending
on the new definition siginfo for SIGTRAP TRAP_PERF this set of
changes cleans up siginfo_t.
- The si_trapno field is demoted from magic alpha and sparc status
and made an ordinary union member of the _sigfault member of
siginfo_t. Without moving it of course.
- si_perf is replaced with si_perf_data and si_perf_type ending the
abuse of si_errno.
- Unnecessary additions to signalfd_siginfo are removed"
* 'for-v5.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
signalfd: Remove SIL_PERF_EVENT fields from signalfd_siginfo
signal: Deliver all of the siginfo perf data in _perf
signal: Factor force_sig_perf out of perf_sigtrap
signal: Implement SIL_FAULT_TRAPNO
siginfo: Move si_trapno inside the union inside _si_fault
- Extend subdirectory expressions to also include recursively
- Combine expressions with common owners
- Minor cleanups
Note, the way expressions are evaluated in the code-owners plugin (as
of now and for compatibility with the `find-owners` plugin), means we
match slightly more than expected, even with just the single asterisk.
As expressions like `net*` are implicitly treated like `{**/,}net*`,
we would not only match net_something.h and net_filter/header.h, but
also (unexpectedly) platform/net_something.h.
This change does not make things better in this regards, but for all the
above mentioned points, this is an improvement.
Syntax Documentation:
https://gerrit.googlesource.com/plugins/code-owners/+/refs/heads/master/resources/Documentation/path-expressions.md
Fixes: 1d1197098c ("ANDROID: add initial set of OWNERS")
Signed-off-by: Matthias Maennich <maennich@google.com>
Change-Id: I7e5503382c7c6247a77c13c5c9f2ffd3cc6dd7e6
Here is a big set of char/misc/other driver fixes for 5.13-rc3.
The majority here is the fallout of the umn.edu re-review of all prior
submissions. That resulted in a bunch of reverts along with the
"correct" changes made, such that there is no regression of any of the
potential fixes that were made by those individuals. I would like to
thank the over 80 different developers who helped with the review and
fixes for this mess.
Other than that, there's a few habanna driver fixes for reported issues,
and some dyndbg fixes for reported problems.
All of these have been in linux-next for a while with no reported
problems.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'char-misc-5.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc driver fixes from Greg KH:
"Here is a big set of char/misc/other driver fixes for 5.13-rc3.
The majority here is the fallout of the umn.edu re-review of all prior
submissions. That resulted in a bunch of reverts along with the
"correct" changes made, such that there is no regression of any of the
potential fixes that were made by those individuals. I would like to
thank the over 80 different developers who helped with the review and
fixes for this mess.
Other than that, there's a few habanna driver fixes for reported
issues, and some dyndbg fixes for reported problems.
All of these have been in linux-next for a while with no reported
problems"
* tag 'char-misc-5.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (82 commits)
misc: eeprom: at24: check suspend status before disable regulator
uio_hv_generic: Fix another memory leak in error handling paths
uio_hv_generic: Fix a memory leak in error handling paths
uio/uio_pci_generic: fix return value changed in refactoring
Revert "Revert "ALSA: usx2y: Fix potential NULL pointer dereference""
dyndbg: drop uninformative vpr_info
dyndbg: avoid calling dyndbg_emit_prefix when it has no work
binder: Return EFAULT if we fail BINDER_ENABLE_ONEWAY_SPAM_DETECTION
cdrom: gdrom: initialize global variable at init time
brcmfmac: properly check for bus register errors
Revert "brcmfmac: add a check for the status of usb_register"
video: imsttfb: check for ioremap() failures
Revert "video: imsttfb: fix potential NULL pointer dereferences"
net: liquidio: Add missing null pointer checks
Revert "net: liquidio: fix a NULL pointer dereference"
media: gspca: properly check for errors in po1030_probe()
Revert "media: gspca: Check the return value of write_bridge for timeout"
media: gspca: mt9m111: Check write_bridge for timeout
Revert "media: gspca: mt9m111: Check write_bridge for timeout"
media: dvb: Add check on sp8870_readreg return
...
With the addition of ssi_perf_data and ssi_perf_type struct signalfd_siginfo
is dangerously close to running out of space. All that remains is just
enough space for two additional 64bit fields. A practice of adding all
possible siginfo_t fields into struct singalfd_siginfo can not be supported
as adding the missing fields ssi_lower, ssi_upper, and ssi_pkey would
require two 64bit fields and one 32bit fields. In practice the fields
ssi_perf_data and ssi_perf_type can never be used by signalfd as the signal
that generates them always delivers them synchronously to the thread that
triggers them.
Therefore until someone actually needs the fields ssi_perf_data and
ssi_perf_type in signalfd_siginfo remove them. This leaves a bit more room
for future expansion.
v1: https://lkml.kernel.org/r/20210503203814.25487-12-ebiederm@xmission.com
v2: https://lkml.kernel.org/r/20210505141101.11519-12-ebiederm@xmission.com
Link: https://lkml.kernel.org/r/20210517195748.8880-5-ebiederm@xmission.com
Reviewed-by: Marco Elver <elver@google.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
It turns out that linux uses si_trapno very sparingly, and as such it
can be considered extra information for a very narrow selection of
signals, rather than information that is present with every fault
reported in siginfo.
As such move si_trapno inside the union inside of _si_fault. This
results in no change in placement, and makes it eaiser
to extend _si_fault in the future as this reduces the number of
special cases. In particular with si_trapno included in the union it
is no longer a concern that the union must be pointer aligned on most
architectures because the union follows immediately after si_addr
which is a pointer.
This change results in a difference in siginfo field placement on
sparc and alpha for the fields si_addr_lsb, si_lower, si_upper,
si_pkey, and si_perf. These architectures do not implement the
signals that would use si_addr_lsb, si_lower, si_upper, si_pkey, and
si_perf. Further these architecture have not yet implemented the
userspace that would use si_perf.
The point of this change is in fact to correct these placement issues
before sparc or alpha grow userspace that cares. This change was
discussed[1] and the agreement is that this change is currently safe.
[1]: https://lkml.kernel.org/r/CAK8P3a0+uKYwL1NhY6Hvtieghba2hKYGD6hcKx5n8=4Gtt+pHA@mail.gmail.com
Acked-by: Marco Elver <elver@google.com>
v1: https://lkml.kernel.org/r/m1tunns7yf.fsf_-_@fess.ebiederm.org
v2: https://lkml.kernel.org/r/20210505141101.11519-5-ebiederm@xmission.com
Link: https://lkml.kernel.org/r/20210517195748.8880-1-ebiederm@xmission.com
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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Merge tag 'block-5.13-2021-05-14' of git://git.kernel.dk/linux-block
Pull block fixes from Jens Axboe:
- Fix for shared tag set exit (Bart)
- Correct ioctl range for zoned ioctls (Damien)
- Removed dead/unused function (Lin)
- Fix perf regression for shared tags (Ming)
- Fix out-of-bounds issue with kyber and preemption (Omar)
- BFQ merge fix (Paolo)
- Two error handling fixes for nbd (Sun)
- Fix weight update in blk-iocost (Tejun)
- NVMe pull request (Christoph):
- correct the check for using the inline bio in nvmet (Chaitanya
Kulkarni)
- demote unsupported command warnings (Chaitanya Kulkarni)
- fix corruption due to double initializing ANA state (me, Hou Pu)
- reset ns->file when open fails (Daniel Wagner)
- fix a NULL deref when SEND is completed with error in nvmet-rdma
(Michal Kalderon)
- Fix kernel-doc warning (Bart)
* tag 'block-5.13-2021-05-14' of git://git.kernel.dk/linux-block:
block/partitions/efi.c: Fix the efi_partition() kernel-doc header
blk-mq: Swap two calls in blk_mq_exit_queue()
blk-mq: plug request for shared sbitmap
nvmet: use new ana_log_size instead the old one
nvmet: seset ns->file when open fails
nbd: share nbd_put and return by goto put_nbd
nbd: Fix NULL pointer in flush_workqueue
blkdev.h: remove unused codes blk_account_rq
block, bfq: avoid circular stable merges
blk-iocost: fix weight updates of inner active iocgs
nvmet: demote fabrics cmd parse err msg to debug
nvmet: use helper to remove the duplicate code
nvmet: demote discovery cmd parse err msg to debug
nvmet-rdma: Fix NULL deref when SEND is completed with error
nvmet: fix inline bio check for passthru
nvmet: fix inline bio check for bdev-ns
nvme-multipath: fix double initialization of ANA state
kyber: fix out of bounds access when preempted
block: uapi: fix comment about block device ioctl
One giant leap, all the way up to 5.13-rc1
Also take the opportunity to re-align (a.k.a. fix a couple of previous
merge conflict fix-up issues) which occurred during this merge-window.
Fixes: 4797acfb9c ("Merge 16b3d0cf5b Merge tag 'sched-core-2021-04-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into android-mainline")
Fixes: 92f282f338 ("Merge 8ca5297e7e Merge tag 'kconfig-v5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild into android-mainline")
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Change-Id: Ie9389f595776e8f66bba6eaf0fa7a3587c6a5749
Fix the comment mentioning ioctl command range used for zoned block
devices to reflect the range of commands actually implemented.
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Link: https://lore.kernel.org/r/20210509234806.3000-1-damien.lemoal@wdc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
- Expose PLL information per ASIC. This also fixes some casting warnings.
- Skip reading further firmware errors in case PCI link is down.
- Security firmware error should be handled as error and not warning.
- Allow user to ignore firmware errors.
- Fix bug in timeout calculation when waiting for interrupt of CS.
- Fix bug of potential use-after-free.
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Merge tag 'misc-habanalabs-fixes-2021-05-08' of https://git.kernel.org/pub/scm/linux/kernel/git/ogabbay/linux into char-misc-linus
Oded writes:
This tag contains the following fixes for 5.13-rc2:
- Expose PLL information per ASIC. This also fixes some casting warnings.
- Skip reading further firmware errors in case PCI link is down.
- Security firmware error should be handled as error and not warning.
- Allow user to ignore firmware errors.
- Fix bug in timeout calculation when waiting for interrupt of CS.
- Fix bug of potential use-after-free.
* tag 'misc-habanalabs-fixes-2021-05-08' of https://git.kernel.org/pub/scm/linux/kernel/git/ogabbay/linux:
habanalabs/gaudi: Fix a potential use after free in gaudi_memset_device_memory
habanalabs: wait for interrupt wrong timeout calculation
habanalabs: ignore f/w status error
habanalabs: change error level of security not ready
habanalabs: skip reading f/w errors on bad status
habanalabs: expose ASIC specific PLL index
and netfilter trees. Self-contained fixes, nothing risky.
Current release - new code bugs:
- dsa: ksz: fix a few bugs found by static-checker in the new driver
- stmmac: fix frame preemption handshake not triggering after
interface restart
Previous releases - regressions:
- make nla_strcmp handle more then one trailing null character
- fix stack OOB reads while fragmenting IPv4 packets in openvswitch
and net/sched
- sctp: do asoc update earlier in sctp_sf_do_dupcook_a
- sctp: delay auto_asconf init until binding the first addr
- stmmac: clear receive all(RA) bit when promiscuous mode is off
- can: mcp251x: fix resume from sleep before interface was brought up
Previous releases - always broken:
- bpf: fix leakage of uninitialized bpf stack under speculation
- bpf: fix masking negation logic upon negative dst register
- netfilter: don't assume that skb_header_pointer() will never fail
- only allow init netns to set default tcp cong to a restricted algo
- xsk: fix xp_aligned_validate_desc() when len == chunk_size to
avoid false positive errors
- ethtool: fix missing NLM_F_MULTI flag when dumping
- can: m_can: m_can_tx_work_queue(): fix tx_skb race condition
- sctp: fix a SCTP_MIB_CURRESTAB leak in sctp_sf_do_dupcook_b
- bridge: fix NULL-deref caused by a races between assigning
rx_handler_data and setting the IFF_BRIDGE_PORT bit
Latecomer:
- seg6: add counters support for SRv6 Behaviors
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Merge tag 'net-5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Pull networking fixes from Jakub Kicinski:
"Networking fixes for 5.13-rc1, including fixes from bpf, can and
netfilter trees. Self-contained fixes, nothing risky.
Current release - new code bugs:
- dsa: ksz: fix a few bugs found by static-checker in the new driver
- stmmac: fix frame preemption handshake not triggering after
interface restart
Previous releases - regressions:
- make nla_strcmp handle more then one trailing null character
- fix stack OOB reads while fragmenting IPv4 packets in openvswitch
and net/sched
- sctp: do asoc update earlier in sctp_sf_do_dupcook_a
- sctp: delay auto_asconf init until binding the first addr
- stmmac: clear receive all(RA) bit when promiscuous mode is off
- can: mcp251x: fix resume from sleep before interface was brought up
Previous releases - always broken:
- bpf: fix leakage of uninitialized bpf stack under speculation
- bpf: fix masking negation logic upon negative dst register
- netfilter: don't assume that skb_header_pointer() will never fail
- only allow init netns to set default tcp cong to a restricted algo
- xsk: fix xp_aligned_validate_desc() when len == chunk_size to avoid
false positive errors
- ethtool: fix missing NLM_F_MULTI flag when dumping
- can: m_can: m_can_tx_work_queue(): fix tx_skb race condition
- sctp: fix a SCTP_MIB_CURRESTAB leak in sctp_sf_do_dupcook_b
- bridge: fix NULL-deref caused by a races between assigning
rx_handler_data and setting the IFF_BRIDGE_PORT bit
Latecomer:
- seg6: add counters support for SRv6 Behaviors"
* tag 'net-5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (73 commits)
atm: firestream: Use fallthrough pseudo-keyword
net: stmmac: Do not enable RX FIFO overflow interrupts
mptcp: fix splat when closing unaccepted socket
i40e: Remove LLDP frame filters
i40e: Fix PHY type identifiers for 2.5G and 5G adapters
i40e: fix the restart auto-negotiation after FEC modified
i40e: Fix use-after-free in i40e_client_subtask()
i40e: fix broken XDP support
netfilter: nftables: avoid potential overflows on 32bit arches
netfilter: nftables: avoid overflows in nft_hash_buckets()
tcp: Specify cmsgbuf is user pointer for receive zerocopy.
mlxsw: spectrum_mr: Update egress RIF list before route's action
net: ipa: fix inter-EE IRQ register definitions
can: m_can: m_can_tx_work_queue(): fix tx_skb race condition
can: mcp251x: fix resume from sleep before interface was brought up
can: mcp251xfd: mcp251xfd_probe(): add missing can_rx_offload_del() in error path
can: mcp251xfd: mcp251xfd_probe(): fix an error pointer dereference in probe
netfilter: nftables: Fix a memleak from userdata error path in new objects
netfilter: remove BUG_ON() after skb_header_pointer()
netfilter: nfnetlink_osf: Fix a missing skb_header_pointer() NULL check
...
Currently the user cannot interpret the PLL information based on index
as its exposed as an integer.
This commit exposes ASIC specific PLL indexes and maps it to a generic
FW compatible index.
Signed-off-by: Bharat Jauhari <bjauhari@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
- Extend subdirectory expressions to also include recursively
- Combine expressions with common owners
- Minor cleanups
Note, the way expressions are evaluated in the plugin (as of now and
for compatibility with the `find-owners` plugin), means we match
slightly more than expected, even with just the single asterisk.
As expressions like `net*` are implicitly treated like `{**/,}net*`,
we would not only match net_something.h and net_filter/header.h, but
also (unexpectedly) platform/net_something.h.
This change does not make things better in this regards, but for all the
above mentioned points, this is an improvement.
Syntax Documentation:
https://gerrit.googlesource.com/plugins/code-owners/+/refs/heads/master/resources/Documentation/path-expressions.md
Fixes: 1d1197098c ("ANDROID: add initial set of OWNERS")
Signed-off-by: Matthias Maennich <maennich@google.com>
Change-Id: I6e2f251fc753369bb9c5058599ded19bfee98296
The section "19) Editor modelines and other cruft" in
Documentation/process/coding-style.rst clearly says, "Do not include any
of these in source files."
I recently receive a patch to explicitly add a new one.
Let's do treewide cleanups, otherwise some people follow the existing code
and attempt to upstream their favoriate editor setups.
It is even nicer if scripts/checkpatch.pl can check it.
If we like to impose coding style in an editor-independent manner, I think
editorconfig (patch [1]) is a saner solution.
[1] https://lore.kernel.org/lkml/20200703073143.423557-1-danny@kdrag0n.dev/
Link: https://lkml.kernel.org/r/20210324054457.1477489-1-masahiroy@kernel.org
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Miguel Ojeda <ojeda@kernel.org> [auxdisplay]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Support for the memtest= kernel command-line argument.
* Support for building the kernel with FORTIFY_SOURCE.
* Support for generic clockevent broadcasts.
* Support for the buildtar build target.
* Some build system cleanups to pass more LLVM-friendly arguments.
* Support for kprobes.
* A rearranged kernel memory map, the first part of supporting sv48
systems.
* Improvements to kexec, along with support for kdump and crash kernels.
* An alternatives-based errata framework, along with support for
handling a pair of errata that manifest on some SiFive designs
(including the HiFive Unmatched).
* Support for XIP.
* A device tree for the Microchip PolarFire ICICLE SoC and associated
dev board.
Along with a bunch of cleanups. There are already a handful of fixes
on the list so there will likely be a part 2.
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Merge tag 'riscv-for-linus-5.13-mw0' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux
Pull RISC-V updates from Palmer Dabbelt:
- Support for the memtest= kernel command-line argument.
- Support for building the kernel with FORTIFY_SOURCE.
- Support for generic clockevent broadcasts.
- Support for the buildtar build target.
- Some build system cleanups to pass more LLVM-friendly arguments.
- Support for kprobes.
- A rearranged kernel memory map, the first part of supporting sv48
systems.
- Improvements to kexec, along with support for kdump and crash
kernels.
- An alternatives-based errata framework, along with support for
handling a pair of errata that manifest on some SiFive designs
(including the HiFive Unmatched).
- Support for XIP.
- A device tree for the Microchip PolarFire ICICLE SoC and associated
dev board.
... along with a bunch of cleanups. There are already a handful of fixes
on the list so there will likely be a part 2.
* tag 'riscv-for-linus-5.13-mw0' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux: (45 commits)
RISC-V: Always define XIP_FIXUP
riscv: Remove 32b kernel mapping from page table dump
riscv: Fix 32b kernel build with CONFIG_DEBUG_VIRTUAL=y
RISC-V: Fix error code returned by riscv_hartid_to_cpuid()
RISC-V: Enable Microchip PolarFire ICICLE SoC
RISC-V: Initial DTS for Microchip ICICLE board
dt-bindings: riscv: microchip: Add YAML documentation for the PolarFire SoC
RISC-V: Add Microchip PolarFire SoC kconfig option
RISC-V: enable XIP
RISC-V: Add crash kernel support
RISC-V: Add kdump support
RISC-V: Improve init_resources()
RISC-V: Add kexec support
RISC-V: Add EM_RISCV to kexec UAPI header
riscv: vdso: fix and clean-up Makefile
riscv/mm: Use BUG_ON instead of if condition followed by BUG.
riscv/kprobe: fix kernel panic when invoking sys_read traced by kprobe
riscv: Set ARCH_HAS_STRICT_MODULE_RWX if MMU
riscv: module: Create module allocations without exec permissions
riscv: bpf: Avoid breaking W^X
...
Merge more updates from Andrew Morton:
"The remainder of the main mm/ queue.
143 patches.
Subsystems affected by this patch series (all mm): pagecache, hugetlb,
userfaultfd, vmscan, compaction, migration, cma, ksm, vmstat, mmap,
kconfig, util, memory-hotplug, zswap, zsmalloc, highmem, cleanups, and
kfence"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (143 commits)
kfence: use power-efficient work queue to run delayed work
kfence: maximize allocation wait timeout duration
kfence: await for allocation using wait_event
kfence: zero guard page after out-of-bounds access
mm/process_vm_access.c: remove duplicate include
mm/mempool: minor coding style tweaks
mm/highmem.c: fix coding style issue
btrfs: use memzero_page() instead of open coded kmap pattern
iov_iter: lift memzero_page() to highmem.h
mm/zsmalloc: use BUG_ON instead of if condition followed by BUG.
mm/zswap.c: switch from strlcpy to strscpy
arm64/Kconfig: introduce ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
x86/Kconfig: introduce ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
mm,memory_hotplug: add kernel boot option to enable memmap_on_memory
acpi,memhotplug: enable MHP_MEMMAP_ON_MEMORY when supported
mm,memory_hotplug: allocate memmap from the added memory range
mm,memory_hotplug: factor out adjusting present pages into adjust_present_page_count()
mm,memory_hotplug: relax fully spanned sections check
drivers/base/memory: introduce memory_block_{online,offline}
mm/memory_hotplug: remove broken locking of zone PCP structures during hot remove
...
- Fix spellos in comments for the tegra and sun8i (Bhaskar Chowdhury)
- Add the missing fifth node on the rcar_gen3 sensor (Niklas
Söderlund)
- Remove duplicate include in ti-bandgap (Zhang Yunkai)
- Assign error code in the error path in the function
thermal_of_populate_bind_params() (Jia-Ju Bai)
- Fix spelling mistake in a comment 'disabed' -> 'disabled' (Colin Ian
King)
- Use the device name instead of auto-numbering for a better
identification of the cooling device (Daniel Lezcano)
- Improve a bit the division accuracy in the power allocator governor
(Jeson Gao)
- Enable the missing third sensor on msm8976 (Konrad Dybcio)
- Add QCom tsens driver co-maintainer (Thara Gopinath)
- Fix memory leak and use after free errors in the core code (Daniel
Lezcano)
- Add the MDM9607 compatible bindings (Konrad Dybcio)
- Fix trivial spello in the copyright name for Hisilicon (Hao Fang)
- Fix negative index array access when converting the frequency to
power in the energy model (Brian-sy Yang)
- Add support for Gen2 new PMIC support for Qcom SPMI (David Collins)
- Update maintainer file for CPU cooling device section (Lukasz Luba)
- Fix missing put_device on error in the Qcom tsens driver (Guangqing
Zhu)
- Add compatible DT binding for sm8350 (Robert Foss)
- Add support for the MDM9607's tsens driver (Konrad Dybcio)
- Remove duplicate error messages in thermal_mmio and the bcm2835
driver (Ruiqi Gong)
- Add the Thermal Temperature Cooling driver (Zhang Rui)
- Remove duplicate error messages in the Hisilicon sensor driver (Ye
Bin)
- Use the devm_platform_ioremap_resource_byname() function instead of
a couple of corresponding calls (dingsenjie)
- Sort the headers alphabetically in the ti-bandgap driver (Zhen Lei)
- Add missing property in the DT thermal sensor binding (Rafał
Miłecki)
- Remove dead code in the ti-bandgap sensor driver (Lin Ruizhe)
- Convert the BRCM DT bindings to the yaml schema (Rafał Miłecki)
- Replace the thermal_notify_framework() call by a call to the
thermal_zone_device_update() function. Remove the function as well
as the corresponding documentation (Thara Gopinath)
- Add support for the ipq8064-tsens sensor along with a set of
cleanups and code preparation (Ansuel Smith)
- Add a lockless __thermal_cdev_update() function to improve the
locking scheme in the core code and governors (Lukasz Luba)
- Fix multiple cooling device notification changes (Lukasz Luba)
- Remove unneeded variable initialization (Colin Ian King)
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Merge tag 'thermal-v5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux
Pull thermal updates from Daniel Lezcano:
- Remove duplicate error message for the amlogic driver (Tang Bin)
- Fix spellos in comments for the tegra and sun8i (Bhaskar Chowdhury)
- Add the missing fifth node on the rcar_gen3 sensor (Niklas Söderlund)
- Remove duplicate include in ti-bandgap (Zhang Yunkai)
- Assign error code in the error path in the function
thermal_of_populate_bind_params() (Jia-Ju Bai)
- Fix spelling mistake in a comment 'disabed' -> 'disabled' (Colin Ian
King)
- Use the device name instead of auto-numbering for a better
identification of the cooling device (Daniel Lezcano)
- Improve a bit the division accuracy in the power allocator governor
(Jeson Gao)
- Enable the missing third sensor on msm8976 (Konrad Dybcio)
- Add QCom tsens driver co-maintainer (Thara Gopinath)
- Fix memory leak and use after free errors in the core code (Daniel
Lezcano)
- Add the MDM9607 compatible bindings (Konrad Dybcio)
- Fix trivial spello in the copyright name for Hisilicon (Hao Fang)
- Fix negative index array access when converting the frequency to
power in the energy model (Brian-sy Yang)
- Add support for Gen2 new PMIC support for Qcom SPMI (David Collins)
- Update maintainer file for CPU cooling device section (Lukasz Luba)
- Fix missing put_device on error in the Qcom tsens driver (Guangqing
Zhu)
- Add compatible DT binding for sm8350 (Robert Foss)
- Add support for the MDM9607's tsens driver (Konrad Dybcio)
- Remove duplicate error messages in thermal_mmio and the bcm2835
driver (Ruiqi Gong)
- Add the Thermal Temperature Cooling driver (Zhang Rui)
- Remove duplicate error messages in the Hisilicon sensor driver (Ye
Bin)
- Use the devm_platform_ioremap_resource_byname() function instead of a
couple of corresponding calls (dingsenjie)
- Sort the headers alphabetically in the ti-bandgap driver (Zhen Lei)
- Add missing property in the DT thermal sensor binding (Rafał Miłecki)
- Remove dead code in the ti-bandgap sensor driver (Lin Ruizhe)
- Convert the BRCM DT bindings to the yaml schema (Rafał Miłecki)
- Replace the thermal_notify_framework() call by a call to the
thermal_zone_device_update() function. Remove the function as well as
the corresponding documentation (Thara Gopinath)
- Add support for the ipq8064-tsens sensor along with a set of cleanups
and code preparation (Ansuel Smith)
- Add a lockless __thermal_cdev_update() function to improve the
locking scheme in the core code and governors (Lukasz Luba)
- Fix multiple cooling device notification changes (Lukasz Luba)
- Remove unneeded variable initialization (Colin Ian King)
* tag 'thermal-v5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux: (55 commits)
thermal/drivers/mtk_thermal: Remove redundant initializations of several variables
thermal/core/power allocator: Use the lockless __thermal_cdev_update() function
thermal/core/fair share: Use the lockless __thermal_cdev_update() function
thermal/core/fair share: Lock the thermal zone while looping over instances
thermal/core/power_allocator: Update once cooling devices when temp is low
thermal/core/power_allocator: Maintain the device statistics from going stale
thermal/core: Create a helper __thermal_cdev_update() without a lock
dt-bindings: thermal: tsens: Document ipq8064 bindings
thermal/drivers/tsens: Add support for ipq8064-tsens
thermal/drivers/tsens: Drop unused define for msm8960
thermal/drivers/tsens: Replace custom 8960 apis with generic apis
thermal/drivers/tsens: Fix bug in sensor enable for msm8960
thermal/drivers/tsens: Use init_common for msm8960
thermal/drivers/tsens: Add VER_0 tsens version
thermal/drivers/tsens: Convert msm8960 to reg_field
thermal/drivers/tsens: Don't hardcode sensor slope
Documentation: driver-api: thermal: Remove thermal_notify_framework from documentation
thermal/core: Remove thermal_notify_framework
iwlwifi: mvm: tt: Replace thermal_notify_framework
dt-bindings: thermal: brcm,ns-thermal: Convert to the json-schema
...
It is currently not obvious that the RECLAIM_* bits are part of the uapi
since they are defined in vmscan.c. Move them to a uapi header to make it
obvious.
This should have no functional impact.
Link: https://lkml.kernel.org/r/20210219172557.08074910@viggo.jf.intel.com
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Ben Widawsky <ben.widawsky@intel.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Daniel Wagner <dwagner@suse.de>
Cc: "Tobin C. Harding" <tobin@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Qian Cai <cai@lca.pw>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This ioctl is how userspace ought to resolve "minor" userfaults. The
idea is, userspace is notified that a minor fault has occurred. It
might change the contents of the page using its second non-UFFD mapping,
or not. Then, it calls UFFDIO_CONTINUE to tell the kernel "I have
ensured the page contents are correct, carry on setting up the mapping".
Note that it doesn't make much sense to use UFFDIO_{COPY,ZEROPAGE} for
MINOR registered VMAs. ZEROPAGE maps the VMA to the zero page; but in
the minor fault case, we already have some pre-existing underlying page.
Likewise, UFFDIO_COPY isn't useful if we have a second non-UFFD mapping.
We'd just use memcpy() or similar instead.
It turns out hugetlb_mcopy_atomic_pte() already does very close to what
we want, if an existing page is provided via `struct page **pagep`. We
already special-case the behavior a bit for the UFFDIO_ZEROPAGE case, so
just extend that design: add an enum for the three modes of operation,
and make the small adjustments needed for the MCOPY_ATOMIC_CONTINUE
case. (Basically, look up the existing page, and avoid adding the
existing page to the page cache or calling set_page_huge_active() on
it.)
Link: https://lkml.kernel.org/r/20210301222728.176417-5-axelrasmussen@google.com
Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Cc: Adam Ruprecht <ruprecht@google.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Cannon Matthews <cannonmatthews@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chinwen Chang <chinwen.chang@mediatek.com>
Cc: David Rientjes <rientjes@google.com>
Cc: "Dr . David Alan Gilbert" <dgilbert@redhat.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jann Horn <jannh@google.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: "Michal Koutn" <mkoutny@suse.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Oliver Upton <oupton@google.com>
Cc: Shaohua Li <shli@fb.com>
Cc: Shawn Anastasio <shawn@anastas.io>
Cc: Steven Price <steven.price@arm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Patch series "userfaultfd: add minor fault handling", v9.
Overview
========
This series adds a new userfaultfd feature, UFFD_FEATURE_MINOR_HUGETLBFS.
When enabled (via the UFFDIO_API ioctl), this feature means that any
hugetlbfs VMAs registered with UFFDIO_REGISTER_MODE_MISSING will *also*
get events for "minor" faults. By "minor" fault, I mean the following
situation:
Let there exist two mappings (i.e., VMAs) to the same page(s) (shared
memory). One of the mappings is registered with userfaultfd (in minor
mode), and the other is not. Via the non-UFFD mapping, the underlying
pages have already been allocated & filled with some contents. The UFFD
mapping has not yet been faulted in; when it is touched for the first
time, this results in what I'm calling a "minor" fault. As a concrete
example, when working with hugetlbfs, we have huge_pte_none(), but
find_lock_page() finds an existing page.
We also add a new ioctl to resolve such faults: UFFDIO_CONTINUE. The idea
is, userspace resolves the fault by either a) doing nothing if the
contents are already correct, or b) updating the underlying contents using
the second, non-UFFD mapping (via memcpy/memset or similar, or something
fancier like RDMA, or etc...). In either case, userspace issues
UFFDIO_CONTINUE to tell the kernel "I have ensured the page contents are
correct, carry on setting up the mapping".
Use Case
========
Consider the use case of VM live migration (e.g. under QEMU/KVM):
1. While a VM is still running, we copy the contents of its memory to a
target machine. The pages are populated on the target by writing to the
non-UFFD mapping, using the setup described above. The VM is still running
(and therefore its memory is likely changing), so this may be repeated
several times, until we decide the target is "up to date enough".
2. We pause the VM on the source, and start executing on the target machine.
During this gap, the VM's user(s) will *see* a pause, so it is desirable to
minimize this window.
3. Between the last time any page was copied from the source to the target, and
when the VM was paused, the contents of that page may have changed - and
therefore the copy we have on the target machine is out of date. Although we
can keep track of which pages are out of date, for VMs with large amounts of
memory, it is "slow" to transfer this information to the target machine. We
want to resume execution before such a transfer would complete.
4. So, the guest begins executing on the target machine. The first time it
touches its memory (via the UFFD-registered mapping), userspace wants to
intercept this fault. Userspace checks whether or not the page is up to date,
and if not, copies the updated page from the source machine, via the non-UFFD
mapping. Finally, whether a copy was performed or not, userspace issues a
UFFDIO_CONTINUE ioctl to tell the kernel "I have ensured the page contents
are correct, carry on setting up the mapping".
We don't have to do all of the final updates on-demand. The userfaultfd manager
can, in the background, also copy over updated pages once it receives the map of
which pages are up-to-date or not.
Interaction with Existing APIs
==============================
Because this is a feature, a registered VMA could potentially receive both
missing and minor faults. I spent some time thinking through how the
existing API interacts with the new feature:
UFFDIO_CONTINUE cannot be used to resolve non-minor faults, as it does not
allocate a new page. If UFFDIO_CONTINUE is used on a non-minor fault:
- For non-shared memory or shmem, -EINVAL is returned.
- For hugetlb, -EFAULT is returned.
UFFDIO_COPY and UFFDIO_ZEROPAGE cannot be used to resolve minor faults.
Without modifications, the existing codepath assumes a new page needs to
be allocated. This is okay, since userspace must have a second
non-UFFD-registered mapping anyway, thus there isn't much reason to want
to use these in any case (just memcpy or memset or similar).
- If UFFDIO_COPY is used on a minor fault, -EEXIST is returned.
- If UFFDIO_ZEROPAGE is used on a minor fault, -EEXIST is returned (or -EINVAL
in the case of hugetlb, as UFFDIO_ZEROPAGE is unsupported in any case).
- UFFDIO_WRITEPROTECT simply doesn't work with shared memory, and returns
-ENOENT in that case (regardless of the kind of fault).
Future Work
===========
This series only supports hugetlbfs. I have a second series in flight to
support shmem as well, extending the functionality. This series is more
mature than the shmem support at this point, and the functionality works
fully on hugetlbfs, so this series can be merged first and then shmem
support will follow.
This patch (of 6):
This feature allows userspace to intercept "minor" faults. By "minor"
faults, I mean the following situation:
Let there exist two mappings (i.e., VMAs) to the same page(s). One of the
mappings is registered with userfaultfd (in minor mode), and the other is
not. Via the non-UFFD mapping, the underlying pages have already been
allocated & filled with some contents. The UFFD mapping has not yet been
faulted in; when it is touched for the first time, this results in what
I'm calling a "minor" fault. As a concrete example, when working with
hugetlbfs, we have huge_pte_none(), but find_lock_page() finds an existing
page.
This commit adds the new registration mode, and sets the relevant flag on
the VMAs being registered. In the hugetlb fault path, if we find that we
have huge_pte_none(), but find_lock_page() does indeed find an existing
page, then we have a "minor" fault, and if the VMA has the userfaultfd
registration flag, we call into userfaultfd to handle it.
This is implemented as a new registration mode, instead of an API feature.
This is because the alternative implementation has significant drawbacks
[1].
However, doing it this was requires we allocate a VM_* flag for the new
registration mode. On 32-bit systems, there are no unused bits, so this
feature is only supported on architectures with
CONFIG_ARCH_USES_HIGH_VMA_FLAGS. When attempting to register a VMA in
MINOR mode on 32-bit architectures, we return -EINVAL.
[1] https://lore.kernel.org/patchwork/patch/1380226/
[peterx@redhat.com: fix minor fault page leak]
Link: https://lkml.kernel.org/r/20210322175132.36659-1-peterx@redhat.com
Link: https://lkml.kernel.org/r/20210301222728.176417-1-axelrasmussen@google.com
Link: https://lkml.kernel.org/r/20210301222728.176417-2-axelrasmussen@google.com
Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chinwen Chang <chinwen.chang@mediatek.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jann Horn <jannh@google.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: "Michal Koutn" <mkoutny@suse.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Shaohua Li <shli@fb.com>
Cc: Shawn Anastasio <shawn@anastas.io>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Steven Price <steven.price@arm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Adam Ruprecht <ruprecht@google.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Cannon Matthews <cannonmatthews@google.com>
Cc: "Dr . David Alan Gilbert" <dgilbert@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Oliver Upton <oupton@google.com>
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Revert the uAPI changes from the below commit with notice that these
regions and capabilities are no longer provided.
Fixes: b392a19891 ("vfio/pci: remove vfio_pci_nvlink2")
Reported-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Tested-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Message-Id: <162014341432.3807030.11054087109120670135.stgit@omen>
