linux-stable.git/drivers/vdpa, branch linux-6.3.y

vdpa/mlx5: Fix hang when cvq commands are triggered during device unregister

2023-06-14T09:17:03+00:00

[ Upstream commit 73790bdfba076c0886f0f14fd46ff2c70ee31ce9 ]

Currently the vdpa device is unregistered after the workqueue that
processes vq commands is disabled. However, the device unregister
process can still send commands to the cvq (a vlan delete for example)
which leads to a hang because the handing workqueue has been disabled
and the command never finishes:

 [ 2263.095764] rcu: INFO: rcu_sched self-detected stall on CPU
 [ 2263.096307] rcu:        9-....: (5250 ticks this GP) idle=dac4/1/0x4000000000000000 softirq=111009/111009 fqs=2544
 [ 2263.097154] rcu:        (t=5251 jiffies g=393549 q=347 ncpus=10)
 [ 2263.097648] CPU: 9 PID: 94300 Comm: kworker/u20:2 Not tainted 6.3.0-rc6_for_upstream_min_debug_2023_04_14_00_02 #1
 [ 2263.098535] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
 [ 2263.099481] Workqueue: mlx5_events mlx5_vhca_state_work_handler [mlx5_core]
 [ 2263.100143] RIP: 0010:virtnet_send_command+0x109/0x170
 [ 2263.100621] Code: 1d df f5 ff 85 c0 78 5c 48 8b 7b 08 e8 d0 c5 f5 ff 84 c0 75 11 eb 22 48 8b 7b 08 e8 01 b7 f5 ff 84 c0 75 15 f3 90 48 8b 7b 08 <48> 8d 74 24 04 e8 8d c5 f5 ff 48 85 c0 74 de 48 8b 83 f8 00 00 00
 [ 2263.102148] RSP: 0018:ffff888139cf36e8 EFLAGS: 00000246
 [ 2263.102624] RAX: 0000000000000000 RBX: ffff888166bea940 RCX: 0000000000000001
 [ 2263.103244] RDX: 0000000000000000 RSI: ffff888139cf36ec RDI: ffff888146763800
 [ 2263.103864] RBP: ffff888139cf3710 R08: ffff88810d201000 R09: 0000000000000000
 [ 2263.104473] R10: 0000000000000002 R11: 0000000000000003 R12: 0000000000000002
 [ 2263.105082] R13: 0000000000000002 R14: ffff888114528400 R15: ffff888166bea000
 [ 2263.105689] FS:  0000000000000000(0000) GS:ffff88852cc80000(0000) knlGS:0000000000000000
 [ 2263.106404] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 [ 2263.106925] CR2: 00007f31f394b000 CR3: 000000010615b006 CR4: 0000000000370ea0
 [ 2263.107542] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 [ 2263.108163] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
 [ 2263.108769] Call Trace:
 [ 2263.109059]  
 [ 2263.109320]  ? check_preempt_wakeup+0x11f/0x230
 [ 2263.109750]  virtnet_vlan_rx_kill_vid+0x5a/0xa0
 [ 2263.110180]  vlan_vid_del+0x9c/0x170
 [ 2263.110546]  vlan_device_event+0x351/0x760 [8021q]
 [ 2263.111004]  raw_notifier_call_chain+0x41/0x60
 [ 2263.111426]  dev_close_many+0xcb/0x120
 [ 2263.111808]  unregister_netdevice_many_notify+0x130/0x770
 [ 2263.112297]  ? wq_worker_running+0xa/0x30
 [ 2263.112688]  unregister_netdevice_queue+0x89/0xc0
 [ 2263.113128]  unregister_netdev+0x18/0x20
 [ 2263.113512]  virtnet_remove+0x4f/0x230
 [ 2263.113885]  virtio_dev_remove+0x31/0x70
 [ 2263.114273]  device_release_driver_internal+0x18f/0x1f0
 [ 2263.114746]  bus_remove_device+0xc6/0x130
 [ 2263.115146]  device_del+0x173/0x3c0
 [ 2263.115502]  ? kernfs_find_ns+0x35/0xd0
 [ 2263.115895]  device_unregister+0x1a/0x60
 [ 2263.116279]  unregister_virtio_device+0x11/0x20
 [ 2263.116706]  device_release_driver_internal+0x18f/0x1f0
 [ 2263.117182]  bus_remove_device+0xc6/0x130
 [ 2263.117576]  device_del+0x173/0x3c0
 [ 2263.117929]  ? vdpa_dev_remove+0x20/0x20 [vdpa]
 [ 2263.118364]  device_unregister+0x1a/0x60
 [ 2263.118752]  mlx5_vdpa_dev_del+0x4c/0x80 [mlx5_vdpa]
 [ 2263.119232]  vdpa_match_remove+0x21/0x30 [vdpa]
 [ 2263.119663]  bus_for_each_dev+0x71/0xc0
 [ 2263.120054]  vdpa_mgmtdev_unregister+0x57/0x70 [vdpa]
 [ 2263.120520]  mlx5v_remove+0x12/0x20 [mlx5_vdpa]
 [ 2263.120953]  auxiliary_bus_remove+0x18/0x30
 [ 2263.121356]  device_release_driver_internal+0x18f/0x1f0
 [ 2263.121830]  bus_remove_device+0xc6/0x130
 [ 2263.122223]  device_del+0x173/0x3c0
 [ 2263.122581]  ? devl_param_driverinit_value_get+0x29/0x90
 [ 2263.123070]  mlx5_rescan_drivers_locked+0xc4/0x2d0 [mlx5_core]
 [ 2263.123633]  mlx5_unregister_device+0x54/0x80 [mlx5_core]
 [ 2263.124169]  mlx5_uninit_one+0x54/0x150 [mlx5_core]
 [ 2263.124656]  mlx5_sf_dev_remove+0x45/0x90 [mlx5_core]
 [ 2263.125153]  auxiliary_bus_remove+0x18/0x30
 [ 2263.125560]  device_release_driver_internal+0x18f/0x1f0
 [ 2263.126052]  bus_remove_device+0xc6/0x130
 [ 2263.126451]  device_del+0x173/0x3c0
 [ 2263.126815]  mlx5_sf_dev_remove+0x39/0xf0 [mlx5_core]
 [ 2263.127318]  mlx5_sf_dev_state_change_handler+0x178/0x270 [mlx5_core]
 [ 2263.127920]  blocking_notifier_call_chain+0x5a/0x80
 [ 2263.128379]  mlx5_vhca_state_work_handler+0x151/0x200 [mlx5_core]
 [ 2263.128951]  process_one_work+0x1bb/0x3c0
 [ 2263.129355]  ? process_one_work+0x3c0/0x3c0
 [ 2263.129766]  worker_thread+0x4d/0x3c0
 [ 2263.130140]  ? process_one_work+0x3c0/0x3c0
 [ 2263.130548]  kthread+0xb9/0xe0
 [ 2263.130895]  ? kthread_complete_and_exit+0x20/0x20
 [ 2263.131349]  ret_from_fork+0x1f/0x30
 [ 2263.131717]  

The fix is to disable and destroy the workqueue after the device
unregister. It is expected that vhost will not trigger kicks after
the unregister. But even if it would, the wq is disabled already by
setting the pointer to NULL (done so in the referenced commit).

Fixes: ad6dc1daaf29 ("vdpa/mlx5: Avoid processing works if workqueue was destroyed")
Signed-off-by: Dragos Tatulea 
Message-Id: <20230516095800.3549932-1-dtatulea@nvidia.com>
Signed-off-by: Michael S. Tsirkin 
Reviewed-by: Tariq Toukan 
Acked-by: Jason Wang 
Signed-off-by: Sasha Levin

vduse: avoid empty string for dev name

2023-06-14T09:17:03+00:00

[ Upstream commit a90e8608eb0ed93d31ac0feb055f77ce59512542 ]

Syzkaller hits a kernel WARN when the first character of the dev name
provided is NULL. Solution is to add a NULL check before calling
cdev_device_add() in vduse_create_dev().

kobject: (0000000072042169): attempted to be registered with empty name!
WARNING: CPU: 0 PID: 112695 at lib/kobject.c:236
Call Trace:
 kobject_add_varg linux/src/lib/kobject.c:390 [inline]
 kobject_add+0xf6/0x150 linux/src/lib/kobject.c:442
 device_add+0x28f/0xc20 linux/src/drivers/base/core.c:2167
 cdev_device_add+0x83/0xc0 linux/src/fs/char_dev.c:546
 vduse_create_dev linux/src/drivers/vdpa/vdpa_user/vduse_dev.c:2254 [inline]
 vduse_ioctl+0x7b5/0xf30 linux/src/drivers/vdpa/vdpa_user/vduse_dev.c:2316
 vfs_ioctl linux/src/fs/ioctl.c:47 [inline]
 file_ioctl linux/src/fs/ioctl.c:510 [inline]
 do_vfs_ioctl+0x14b/0xa80 linux/src/fs/ioctl.c:697
 ksys_ioctl+0x7c/0xa0 linux/src/fs/ioctl.c:714
 __do_sys_ioctl linux/src/fs/ioctl.c:721 [inline]
 __se_sys_ioctl linux/src/fs/ioctl.c:719 [inline]
 __x64_sys_ioctl+0x42/0x50 linux/src/fs/ioctl.c:719
 do_syscall_64+0x94/0x330 linux/src/arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Fixes: c8a6153b6c59 ("vduse: Introduce VDUSE - vDPA Device in Userspace")
Cc: "Xie Yongji" 
Reported-by: Xianjun Zeng 
Signed-off-by: Sheng Zhao 
Message-Id: <20230530033626.1266794-1-sheng.zhao@bytedance.com>
Signed-off-by: Michael S. Tsirkin 
Acked-by: Jason Wang 
Reviewed-by: Xie Yongji 
Cc: "Michael S. Tsirkin", "Jason Wang",
Reviewed-by: Xie Yongji 
Signed-off-by: Sasha Levin

vdpa/mlx5: Avoid losing link state updates

2023-05-11T14:17:28+00:00

[ Upstream commit c384c2401eed99a2e1f84191e573f15b898babe6 ]

Current code ignores link state updates if VIRTIO_NET_F_STATUS was not
negotiated. However, link state updates could be received before feature
negotiation was completed , therefore causing link state events to be
lost, possibly leaving the link state down.

Modify the code so link state notifier is registered after DRIVER_OK was
negotiated and carry the registration only if
VIRTIO_NET_F_STATUS was negotiated.  Unregister the notifier when the
device is reset.

Fixes: 033779a708f0 ("vdpa/mlx5: make MTU/STATUS presence conditional on feature bits")
Acked-by: Jason Wang 
Signed-off-by: Eli Cohen 
Message-Id: <20230417110343.138319-1-elic@nvidia.com>
Signed-off-by: Michael S. Tsirkin 
Signed-off-by: Sasha Levin

vdpa_sim_net: complete the initialization before register the device

2023-04-04T18:22:12+00:00

Initialization must be completed before calling _vdpa_register_device()
since it can connect the device to the vDPA bus, so requests can arrive
after that call.

So for example vdpasim_net_work(), which uses the net->*_stats variables,
can be scheduled before they are initialized.

Let's move _vdpa_register_device() to the end of vdpasim_net_dev_add()
and add a comment to avoid future issues.

Fixes: 0899774cb360 ("vdpa_sim_net: vendor satistics")
Signed-off-by: Stefano Garzarella 
Message-Id: <20230329160321.187176-1-sgarzare@redhat.com>
Signed-off-by: Michael S. Tsirkin 
Acked-by: Jason Wang

vdpa/mlx5: Add and remove debugfs in setup/teardown driver

2023-04-04T15:08:30+00:00

The right place to add the debugfs create is in
setup_driver() and remove it in teardown_driver().

Current code adds the debugfs when creating the device but resetting a
device will remove the debugfs subtree and subsequent set_driver will
not be able to create the files since the debugfs pointer is NULL.

Fixes: 294221004322 ("vdpa/mlx5: Add debugfs subtree")
Signed-off-by: Eli Cohen 

v3 -> v4:
Fix error flow in setup_driver()
Message-Id: <20230403114039.11102-1-elic@nvidia.com>

Signed-off-by: Michael S. Tsirkin 
Acked-by: Jason Wang

vdpa_sim: set last_used_idx as last_avail_idx in vdpasim_queue_ready

2023-03-13T06:29:12+00:00

Starting from an used_idx different than 0 is needed in use cases like
virtual machine migration.  Not doing so and letting the caller set an
avail idx different than 0 causes destination device to try to use old
buffers that source driver already recover and are not available
anymore.

Since vdpa_sim does not support receive inflight descriptors as a
destination of a migration, let's set both avail_idx and used_idx the
same at vq start.  This is how vhost-user works in a
VHOST_SET_VRING_BASE call.

Although the simple fix is to set last_used_idx at vdpasim_set_vq_state,
it would be reset at vdpasim_queue_ready.  The last_avail_idx case is
fixed with commit 0e84f918fac8 ("vdpa_sim: not reset state in
vdpasim_queue_ready").  Since the only option is to make it equal to
last_avail_idx, adding the only change needed here.

This was discovered and tested live migrating the vdpa_sim_net device.

Fixes: 2c53d0f64c06 ("vdpasim: vDPA device simulator")
Reviewed-by: Stefano Garzarella 
Signed-off-by: Eugenio Pérez 
Message-Id: <20230302181857.925374-1-eperezma@redhat.com>
Signed-off-by: Michael S. Tsirkin

vdpa/mlx5: should not activate virtq object when suspended

2023-03-10T09:02:31+00:00

Otherwise the virtqueue object to instate could point to invalid address
that was unmapped from the MTT:

  mlx5_core 0000:41:04.2: mlx5_cmd_out_err:782:(pid 8321):
  CREATE_GENERAL_OBJECT(0xa00) op_mod(0xd) failed, status
  bad parameter(0x3), syndrome (0x5fa1c), err(-22)

Fixes: cae15c2ed8e6 ("vdpa/mlx5: Implement susupend virtqueue callback")
Cc: Eli Cohen 
Signed-off-by: Si-Wei Liu 
Reviewed-by: Eli Cohen 

Message-Id: <1676424640-11673-1-git-send-email-si-wei.liu@oracle.com>
Signed-off-by: Michael S. Tsirkin 
Acked-by: Jason Wang

vp_vdpa: fix the crash in hot unplug with vp_vdpa

2023-03-10T08:48:27+00:00

While unplugging the vp_vdpa device, it triggers a kernel panic
The root cause is: vdpa_mgmtdev_unregister() will accesses modern
devices which will cause a use after free.
So need to change the sequence in vp_vdpa_remove

[  195.003359] BUG: unable to handle page fault for address: ff4e8beb80199014
[  195.004012] #PF: supervisor read access in kernel mode
[  195.004486] #PF: error_code(0x0000) - not-present page
[  195.004960] PGD 100000067 P4D 1001b6067 PUD 1001b7067 PMD 1001b8067 PTE 0
[  195.005578] Oops: 0000 1 PREEMPT SMP PTI
[  195.005968] CPU: 13 PID: 164 Comm: kworker/u56:10 Kdump: loaded Not tainted 5.14.0-252.el9.x86_64 #1
[  195.006792] Hardware name: Red Hat KVM/RHEL, BIOS edk2-20221207gitfff6d81270b5-2.el9 unknown
[  195.007556] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
[  195.008059] RIP: 0010:ioread8+0x31/0x80
[  195.008418] Code: 77 28 48 81 ff 00 00 01 00 76 0b 89 fa ec 0f b6 c0 c3 cc cc cc cc 8b 15 ad 72 93 01 b8 ff 00 00 00 85 d2 75 0f c3 cc cc cc cc <8a> 07 0f b6 c0 c3 cc cc cc cc 83 ea 01 48 83 ec 08 48 89 fe 48 c7
[  195.010104] RSP: 0018:ff4e8beb8067bab8 EFLAGS: 00010292
[  195.010584] RAX: ffffffffc05834a0 RBX: ffffffffc05843c0 RCX: ff4e8beb8067bae0
[  195.011233] RDX: ff1bcbd580f88000 RSI: 0000000000000246 RDI: ff4e8beb80199014
[  195.011881] RBP: ff1bcbd587e39000 R08: ffffffff916fa2d0 R09: ff4e8beb8067ba68
[  195.012527] R10: 000000000000001c R11: 0000000000000000 R12: ff1bcbd5a3de9120
[  195.013179] R13: ffffffffc062d000 R14: 0000000000000080 R15: ff1bcbe402bc7805
[  195.013826] FS:  0000000000000000(0000) GS:ff1bcbe402740000(0000) knlGS:0000000000000000
[  195.014564] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  195.015093] CR2: ff4e8beb80199014 CR3: 0000000107dea002 CR4: 0000000000771ee0
[  195.015741] PKRU: 55555554
[  195.016001] Call Trace:
[  195.016233]  
[  195.016434]  vp_modern_get_status+0x12/0x20
[  195.016823]  vp_vdpa_reset+0x1b/0x50 [vp_vdpa]
[  195.017238]  virtio_vdpa_reset+0x3c/0x48 [virtio_vdpa]
[  195.017709]  remove_vq_common+0x1f/0x3a0 [virtio_net]
[  195.018178]  virtnet_remove+0x5d/0x70 [virtio_net]
[  195.018618]  virtio_dev_remove+0x3d/0x90
[  195.018986]  device_release_driver_internal+0x1aa/0x230
[  195.019466]  bus_remove_device+0xd8/0x150
[  195.019841]  device_del+0x18b/0x3f0
[  195.020167]  ? kernfs_find_ns+0x35/0xd0
[  195.020526]  device_unregister+0x13/0x60
[  195.020894]  unregister_virtio_device+0x11/0x20
[  195.021311]  device_release_driver_internal+0x1aa/0x230
[  195.021790]  bus_remove_device+0xd8/0x150
[  195.022162]  device_del+0x18b/0x3f0
[  195.022487]  device_unregister+0x13/0x60
[  195.022852]  ? vdpa_dev_remove+0x30/0x30 [vdpa]
[  195.023270]  vp_vdpa_dev_del+0x12/0x20 [vp_vdpa]
[  195.023694]  vdpa_match_remove+0x2b/0x40 [vdpa]
[  195.024115]  bus_for_each_dev+0x78/0xc0
[  195.024471]  vdpa_mgmtdev_unregister+0x65/0x80 [vdpa]
[  195.024937]  vp_vdpa_remove+0x23/0x40 [vp_vdpa]
[  195.025353]  pci_device_remove+0x36/0xa0
[  195.025719]  device_release_driver_internal+0x1aa/0x230
[  195.026201]  pci_stop_bus_device+0x6c/0x90
[  195.026580]  pci_stop_and_remove_bus_device+0xe/0x20
[  195.027039]  disable_slot+0x49/0x90
[  195.027366]  acpiphp_disable_and_eject_slot+0x15/0x90
[  195.027832]  hotplug_event+0xea/0x210
[  195.028171]  ? hotplug_event+0x210/0x210
[  195.028535]  acpiphp_hotplug_notify+0x22/0x80
[  195.028942]  ? hotplug_event+0x210/0x210
[  195.029303]  acpi_device_hotplug+0x8a/0x1d0
[  195.029690]  acpi_hotplug_work_fn+0x1a/0x30
[  195.030077]  process_one_work+0x1e8/0x3c0
[  195.030451]  worker_thread+0x50/0x3b0
[  195.030791]  ? rescuer_thread+0x3a0/0x3a0
[  195.031165]  kthread+0xd9/0x100
[  195.031459]  ? kthread_complete_and_exit+0x20/0x20
[  195.031899]  ret_from_fork+0x22/0x30
[  195.032233]  

Fixes: ffbda8e9df10 ("vdpa/vp_vdpa : add vdpa tool support in vp_vdpa")
Tested-by: Lei Yang 
Cc: stable@vger.kernel.org
Signed-off-by: Cindy Lu 
Message-Id: <20230214080924.131462-1-lulu@redhat.com>
Signed-off-by: Michael S. Tsirkin 
Acked-by: Jason Wang

Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

2023-02-25T19:48:02+00:00

Pull virtio updates from Michael Tsirkin:

 - device feature provisioning in ifcvf, mlx5

 - new SolidNET driver

 - support for zoned block device in virtio blk

 - numa support in virtio pmem

 - VIRTIO_F_RING_RESET support in vhost-net

 - more debugfs entries in mlx5

 - resume support in vdpa

 - completion batching in virtio blk

 - cleanup of dma api use in vdpa

 - now simulating more features in vdpa-sim

 - documentation, features, fixes all over the place

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost: (64 commits)
  vdpa/mlx5: support device features provisioning
  vdpa/mlx5: make MTU/STATUS presence conditional on feature bits
  vdpa: validate device feature provisioning against supported class
  vdpa: validate provisioned device features against specified attribute
  vdpa: conditionally read STATUS in config space
  vdpa: fix improper error message when adding vdpa dev
  vdpa/mlx5: Initialize CVQ iotlb spinlock
  vdpa/mlx5: Don't clear mr struct on destroy MR
  vdpa/mlx5: Directly assign memory key
  tools/virtio: enable to build with retpoline
  vringh: fix a typo in comments for vringh_kiov
  vhost-vdpa: print warning when vhost_vdpa_alloc_domain fails
  scsi: virtio_scsi: fix handling of kmalloc failure
  vdpa: Fix a couple of spelling mistakes in some messages
  vhost-net: support VIRTIO_F_RING_RESET
  vhost-scsi: convert sysfs snprintf and sprintf to sysfs_emit
  vdpa: mlx5: support per virtqueue dma device
  vdpa: set dma mask for vDPA device
  virtio-vdpa: support per vq dma device
  vdpa: introduce get_vq_dma_device()
  ...

Merge tag 'mm-stable-2023-02-20-13-37' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2023-02-24T01:09:35+00:00

Pull MM updates from Andrew Morton:

 - Daniel Verkamp has contributed a memfd series ("mm/memfd: add
   F_SEAL_EXEC") which permits the setting of the memfd execute bit at
   memfd creation time, with the option of sealing the state of the X
   bit.

 - Peter Xu adds a patch series ("mm/hugetlb: Make huge_pte_offset()
   thread-safe for pmd unshare") which addresses a rare race condition
   related to PMD unsharing.

 - Several folioification patch serieses from Matthew Wilcox, Vishal
   Moola, Sidhartha Kumar and Lorenzo Stoakes

 - Johannes Weiner has a series ("mm: push down lock_page_memcg()")
   which does perform some memcg maintenance and cleanup work.

 - SeongJae Park has added DAMOS filtering to DAMON, with the series
   "mm/damon/core: implement damos filter".

   These filters provide users with finer-grained control over DAMOS's
   actions. SeongJae has also done some DAMON cleanup work.

 - Kairui Song adds a series ("Clean up and fixes for swap").

 - Vernon Yang contributed the series "Clean up and refinement for maple
   tree".

 - Yu Zhao has contributed the "mm: multi-gen LRU: memcg LRU" series. It
   adds to MGLRU an LRU of memcgs, to improve the scalability of global
   reclaim.

 - David Hildenbrand has added some userfaultfd cleanup work in the
   series "mm: uffd-wp + change_protection() cleanups".

 - Christoph Hellwig has removed the generic_writepages() library
   function in the series "remove generic_writepages".

 - Baolin Wang has performed some maintenance on the compaction code in
   his series "Some small improvements for compaction".

 - Sidhartha Kumar is doing some maintenance work on struct page in his
   series "Get rid of tail page fields".

 - David Hildenbrand contributed some cleanup, bugfixing and
   generalization of pte management and of pte debugging in his series
   "mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE on all architectures with
   swap PTEs".

 - Mel Gorman and Neil Brown have removed the __GFP_ATOMIC allocation
   flag in the series "Discard __GFP_ATOMIC".

 - Sergey Senozhatsky has improved zsmalloc's memory utilization with
   his series "zsmalloc: make zspage chain size configurable".

 - Joey Gouly has added prctl() support for prohibiting the creation of
   writeable+executable mappings.

   The previous BPF-based approach had shortcomings. See "mm: In-kernel
   support for memory-deny-write-execute (MDWE)".

 - Waiman Long did some kmemleak cleanup and bugfixing in the series
   "mm/kmemleak: Simplify kmemleak_cond_resched() & fix UAF".

 - T.J. Alumbaugh has contributed some MGLRU cleanup work in his series
   "mm: multi-gen LRU: improve".

 - Jiaqi Yan has provided some enhancements to our memory error
   statistics reporting, mainly by presenting the statistics on a
   per-node basis. See the series "Introduce per NUMA node memory error
   statistics".

 - Mel Gorman has a second and hopefully final shot at fixing a CPU-hog
   regression in compaction via his series "Fix excessive CPU usage
   during compaction".

 - Christoph Hellwig does some vmalloc maintenance work in the series
   "cleanup vfree and vunmap".

 - Christoph Hellwig has removed block_device_operations.rw_page() in
   ths series "remove ->rw_page".

 - We get some maple_tree improvements and cleanups in Liam Howlett's
   series "VMA tree type safety and remove __vma_adjust()".

 - Suren Baghdasaryan has done some work on the maintainability of our
   vm_flags handling in the series "introduce vm_flags modifier
   functions".

 - Some pagemap cleanup and generalization work in Mike Rapoport's
   series "mm, arch: add generic implementation of pfn_valid() for
   FLATMEM" and "fixups for generic implementation of pfn_valid()"

 - Baoquan He has done some work to make /proc/vmallocinfo and
   /proc/kcore better represent the real state of things in his series
   "mm/vmalloc.c: allow vread() to read out vm_map_ram areas".

 - Jason Gunthorpe rationalized the GUP system's interface to the rest
   of the kernel in the series "Simplify the external interface for
   GUP".

 - SeongJae Park wishes to migrate people from DAMON's debugfs interface
   over to its sysfs interface. To support this, we'll temporarily be
   printing warnings when people use the debugfs interface. See the
   series "mm/damon: deprecate DAMON debugfs interface".

 - Andrey Konovalov provided the accurately named "lib/stackdepot: fixes
   and clean-ups" series.

 - Huang Ying has provided a dramatic reduction in migration's TLB flush
   IPI rates with the series "migrate_pages(): batch TLB flushing".

 - Arnd Bergmann has some objtool fixups in "objtool warning fixes".

* tag 'mm-stable-2023-02-20-13-37' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (505 commits)
  include/linux/migrate.h: remove unneeded externs
  mm/memory_hotplug: cleanup return value handing in do_migrate_range()
  mm/uffd: fix comment in handling pte markers
  mm: change to return bool for isolate_movable_page()
  mm: hugetlb: change to return bool for isolate_hugetlb()
  mm: change to return bool for isolate_lru_page()
  mm: change to return bool for folio_isolate_lru()
  objtool: add UACCESS exceptions for __tsan_volatile_read/write
  kmsan: disable ftrace in kmsan core code
  kasan: mark addr_has_metadata __always_inline
  mm: memcontrol: rename memcg_kmem_enabled()
  sh: initialize max_mapnr
  m68k/nommu: add missing definition of ARCH_PFN_OFFSET
  mm: percpu: fix incorrect size in pcpu_obj_full_size()
  maple_tree: reduce stack usage with gcc-9 and earlier
  mm: page_alloc: call panic() when memoryless node allocation fails
  mm: multi-gen LRU: avoid futile retries
  migrate_pages: move THP/hugetlb migration support check to simplify code
  migrate_pages: batch flushing TLB
  migrate_pages: share more code between _unmap and _move
  ...