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Filename Latest commit message Latest commit date
Peter Xu 9d2e6505f6 iommu/vt-d: Use domain instead of cache fetching 
after commit a1ddcbe930 ("iommu/vt-d: Pass dmar_domain directly into
iommu_flush_iotlb_psi", 2015-08-12), we have domain pointer as parameter
to iommu_flush_iotlb_psi(), so no need to fetch it from cache again.

More importantly, a NULL reference pointer bug is reported on RHEL7 (and
it can be reproduced on some old upstream kernels too, e.g., v4.13) by
unplugging an 40g nic from a VM (hard to test unplug on real host, but
it should be the same):

https://bugzilla.redhat.com/show_bug.cgi?id=1531367

[   24.391863] pciehp 0000:00:03.0:pcie004: Slot(0): Attention button pressed
[   24.393442] pciehp 0000:00:03.0:pcie004: Slot(0): Powering off due to button press
[   29.721068] i40evf 0000:01:00.0: Unable to send opcode 2 to PF, err I40E_ERR_QUEUE_EMPTY, aq_err OK
[   29.783557] iommu: Removing device 0000:01:00.0 from group 3
[   29.784662] BUG: unable to handle kernel NULL pointer dereference at 0000000000000304
[   29.785817] IP: iommu_flush_iotlb_psi+0xcf/0x120
[   29.786486] PGD 0
[   29.786487] P4D 0
[   29.786812]
[   29.787390] Oops: 0000 [#1] SMP
[   29.787876] Modules linked in: ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_nat ebtable_broute bridge stp llc ip6table_ng
[   29.795371] CPU: 0 PID: 156 Comm: kworker/0:2 Not tainted 4.13.0 #14
[   29.796366] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.11.0-1.el7 04/01/2014
[   29.797593] Workqueue: pciehp-0 pciehp_power_thread
[   29.798328] task: ffff94f5745b4a00 task.stack: ffffb326805ac000
[   29.799178] RIP: 0010:iommu_flush_iotlb_psi+0xcf/0x120
[   29.799919] RSP: 0018:ffffb326805afbd0 EFLAGS: 00010086
[   29.800666] RAX: ffff94f5bc56e800 RBX: 0000000000000000 RCX: 0000000200000025
[   29.801667] RDX: ffff94f5bc56e000 RSI: 0000000000000082 RDI: 0000000000000000
[   29.802755] RBP: ffffb326805afbf8 R08: 0000000000000000 R09: ffff94f5bc86bbf0
[   29.803772] R10: ffffb326805afba8 R11: 00000000000ffdc4 R12: ffff94f5bc86a400
[   29.804789] R13: 0000000000000000 R14: 00000000ffdc4000 R15: 0000000000000000
[   29.805792] FS:  0000000000000000(0000) GS:ffff94f5bfc00000(0000) knlGS:0000000000000000
[   29.806923] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   29.807736] CR2: 0000000000000304 CR3: 000000003499d000 CR4: 00000000000006f0
[   29.808747] Call Trace:
[   29.809156]  flush_unmaps_timeout+0x126/0x1c0
[   29.809800]  domain_exit+0xd6/0x100
[   29.810322]  device_notifier+0x6b/0x70
[   29.810902]  notifier_call_chain+0x4a/0x70
[   29.812822]  __blocking_notifier_call_chain+0x47/0x60
[   29.814499]  blocking_notifier_call_chain+0x16/0x20
[   29.816137]  device_del+0x233/0x320
[   29.817588]  pci_remove_bus_device+0x6f/0x110
[   29.819133]  pci_stop_and_remove_bus_device+0x1a/0x20
[   29.820817]  pciehp_unconfigure_device+0x7a/0x1d0
[   29.822434]  pciehp_disable_slot+0x52/0xe0
[   29.823931]  pciehp_power_thread+0x8a/0xa0
[   29.825411]  process_one_work+0x18c/0x3a0
[   29.826875]  worker_thread+0x4e/0x3b0
[   29.828263]  kthread+0x109/0x140
[   29.829564]  ? process_one_work+0x3a0/0x3a0
[   29.831081]  ? kthread_park+0x60/0x60
[   29.832464]  ret_from_fork+0x25/0x30
[   29.833794] Code: 85 ed 74 0b 5b 41 5c 41 5d 41 5e 41 5f 5d c3 49 8b 54 24 60 44 89 f8 0f b6 c4 48 8b 04 c2 48 85 c0 74 49 45 0f b6 ff 4a 8b 3c f8 <80> bf
[   29.838514] RIP: iommu_flush_iotlb_psi+0xcf/0x120 RSP: ffffb326805afbd0
[   29.840362] CR2: 0000000000000304
[   29.841716] ---[ end trace b10ec0d6900868d3 ]---

This patch fixes that problem if applied to v4.13 kernel.

The bug does not exist on latest upstream kernel since it's fixed as a
side effect of commit 13cf017446 ("iommu/vt-d: Make use of iova
deferred flushing", 2017-08-15).  But IMHO it's still good to have this
patch upstream.

CC: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Fixes: a1ddcbe930 ("iommu/vt-d: Pass dmar_domain directly into iommu_flush_iotlb_psi")
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2018-01-17 14:45:18 +01:00
arch Revert "mm: replace p??_write with pte_access_permitted in fault + gup paths" 2017-12-15 18:53:22 -08:00
block Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2017-12-01 08:05:45 -05:00
certs License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2017-12-11 16:32:45 -08:00
Documentation Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs 2017-12-15 12:46:48 -08:00
drivers iommu/vt-d: Use domain instead of cache fetching 2018-01-17 14:45:18 +01:00
firmware kbuild: remove all dummy assignments to obj- 2017-11-18 11:46:06 +09:00
fs Revert "exec: avoid RLIMIT_STACK races with prlimit()" 2017-12-17 14:26:25 -08:00
include Merge branch 'WIP.x86-pti.base.prep-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-12-17 13:54:31 -08:00
init main: kernel_start: move housekeeping_init() before workqueue_init_early() 2017-11-27 08:56:57 -08:00
ipc Rename superblock flags (MS_xyz -> SB_xyz) 2017-11-27 13:05:09 -08:00
kernel Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-12-17 13:48:50 -08:00
lib Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-12-15 11:44:59 -08:00
mm Revert "mm: replace p??_write with pte_access_permitted in fault + gup paths" 2017-12-15 18:53:22 -08:00
net NFS client fixes for Linux 4.15-rc4 2017-12-16 13:12:53 -08:00
samples Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2017-12-03 13:08:30 -05:00
scripts Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-12-15 11:44:59 -08:00
security KEYS: reject NULL restriction string when type is specified 2017-12-08 15:13:29 +00:00
sound sound fixes for 4.15-rc3 2017-12-06 10:49:14 -08:00
tools Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-12-15 13:08:37 -08:00
usr initramfs: fix initramfs rebuilds w/ compression after disabling 2017-11-03 07:39:19 -07:00
virt KVM: x86: fix APIC page invalidation 2017-12-06 16:10:34 +01:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore Kbuild misc updates for v4.15 2017-11-17 17:51:33 -08:00
.mailmap Add Jason Gunthorpe as co-maintainer of the RDMA stack 2017-11-17 09:36:18 -08:00
COPYING
CREDITS MAINTAINERS: update TPM driver infrastructure changes 2017-11-09 17:58:40 -08:00
Kbuild Kbuild updates for v4.15 2017-11-17 17:45:29 -08:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-12-15 13:08:37 -08:00
Makefile Linux 4.15-rc4 2017-12-17 18:59:59 -08:00
README README: add a new README file, pointing to the Documentation/ 2016-10-24 08:12:35 -02:00

README 

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.