A batch of fixes for the arm64 stub image loader:
- fix a logic bug that can make the random page allocator fail
spuriously
- force reallocation of the Image when it overlaps with firmware
reserved memory regions
- fix an oversight that defeated on optimization introduced earlier
where images loaded at a suitable offset are never moved if booting
without randomization
- complain about images that were not loaded at the right offset by the
firmware image loader.
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Merge tag 'efi_urgent_for_v5.14_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull EFI fixes from Borislav Petkov:
"A batch of fixes for the arm64 stub image loader:
- fix a logic bug that can make the random page allocator fail
spuriously
- force reallocation of the Image when it overlaps with firmware
reserved memory regions
- fix an oversight that defeated on optimization introduced earlier
where images loaded at a suitable offset are never moved if booting
without randomization
- complain about images that were not loaded at the right offset by
the firmware image loader"
* tag 'efi_urgent_for_v5.14_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
efi/libstub: arm64: Double check image alignment at entry
efi/libstub: arm64: Warn when efi_random_alloc() fails
efi/libstub: arm64: Relax 2M alignment again for relocatable kernels
efi/libstub: arm64: Force Image reallocation if BSS was not reserved
arm64: efi: kaslr: Fix occasional random alloc (and boot) failure
version
- Fix resctrl default monitoring groups reporting when new subgroups get
created
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Merge tag 'x86_urgent_for_v5.14_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Borislav Petkov:
"Two fixes:
- An objdump checker fix to ignore parenthesized strings in the
objdump version
- Fix resctrl default monitoring groups reporting when new subgroups
get created"
* tag 'x86_urgent_for_v5.14_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/resctrl: Fix default monitoring groups reporting
x86/tools: Fix objdump version check again
- Plug race between enabling MTE and creating vcpus
- Fix off-by-one bug when checking whether an address range is RAM
x86:
- Fixes for the new MMU, especially a memory leak on hosts with <39
physical address bits
- Remove bogus EFER.NX checks on 32-bit non-PAE hosts
- WAITPKG fix
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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:
- Plug race between enabling MTE and creating vcpus
- Fix off-by-one bug when checking whether an address range is RAM
x86:
- Fixes for the new MMU, especially a memory leak on hosts with <39
physical address bits
- Remove bogus EFER.NX checks on 32-bit non-PAE hosts
- WAITPKG fix"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
KVM: x86/mmu: Protect marking SPs unsync when using TDP MMU with spinlock
KVM: x86/mmu: Don't step down in the TDP iterator when zapping all SPTEs
KVM: x86/mmu: Don't leak non-leaf SPTEs when zapping all SPTEs
KVM: nVMX: Use vmx_need_pf_intercept() when deciding if L0 wants a #PF
kvm: vmx: Sync all matching EPTPs when injecting nested EPT fault
KVM: x86: remove dead initialization
KVM: x86: Allow guest to set EFER.NX=1 on non-PAE 32-bit kernels
KVM: VMX: Use current VMCS to query WAITPKG support for MSR emulation
KVM: arm64: Fix race when enabling KVM_ARM_CAP_MTE
KVM: arm64: Fix off-by-one in range_is_memory
This contains a revert for a patch that has been causing issues:
- Revert: qcom: rpmh: Add BCMs to commit list in pre_aggregate
Signed-off-by: Georgi Djakov <djakov@kernel.org>
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Merge tag 'icc-5.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/djakov/icc into char-misc-linus
Georgi writes:
interconnect fix for v5.14
This contains a revert for a patch that has been causing issues:
- Revert: qcom: rpmh: Add BCMs to commit list in pre_aggregate
Signed-off-by: Georgi Djakov <djakov@kernel.org>
* tag 'icc-5.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/djakov/icc:
Revert "interconnect: qcom: icc-rpmh: Add BCMs to commit list in pre_aggregate"
The 2021-model XPS 15 appears to use the same 4-speakers-on-ALC289 audio
setup as the Precision models, so requires the same quirk to enable woofer
output. Tested on my own 9510.
Signed-off-by: Kristin Paget <kristin@tombom.co.uk>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/e1fc95c5-c10a-1f98-a5c2-dd6e336157e1@tombom.co.uk
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Three minor fixes, all in drivers.
Signed-off-by: James E.J. Bottomley <jejb@linux.ibm.com>
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Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Pull SCSI fixes from James Bottomley:
"Three minor fixes, all in drivers"
* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
scsi: mpt3sas: Fix incorrectly assigned error return and check
scsi: storvsc: Log TEST_UNIT_READY errors as warnings
scsi: lpfc: Move initialization of phba->poll_list earlier to avoid crash
- Fix support for NFIT "virtual" ranges (BIOS-defined memory disks)
- Fix recovery from failed label storage areas on NVDIMM devices
- Miscellaneous cleanups from Ira's investigation of dax_direct_access
paths preparing for stray-write protection.
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Merge tag 'libnvdimm-fixes-5.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
Pull libnvdimm fixes from Dan Williams:
"A couple of fixes for long standing bugs, a warning fixup, and some
miscellaneous dax cleanups.
The bugs were recently found due to new platforms looking to use the
ACPI NFIT "virtual" device definition, and new error injection
capabilities to trigger error responses to label area requests. Ira's
cleanups have been long pending, I neglected to send them earlier, and
see no harm in including them now. This has all appeared in -next with
no reported issues.
Summary:
- Fix support for NFIT "virtual" ranges (BIOS-defined memory disks)
- Fix recovery from failed label storage areas on NVDIMM devices
- Miscellaneous cleanups from Ira's investigation of
dax_direct_access paths preparing for stray-write protection"
* tag 'libnvdimm-fixes-5.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
tools/testing/nvdimm: Fix missing 'fallthrough' warning
libnvdimm/region: Fix label activation vs errors
ACPI: NFIT: Fix support for virtual SPA ranges
dax: Ensure errno is returned from dax_direct_access
fs/dax: Clarify nr_pages to dax_direct_access()
fs/fuse: Remove unneeded kaddr parameter
Here is a single revert of a commit that caused problems in 5.14-rc5 for
5.14-rc6. It has been in linux-next almost all week, and has resolved
the issues that were reported on lots of different systems that were not
the platform that the change was originally tested on (gotta love SoC
cores used in multiple devices from multiple vendors...)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'usb-5.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Pull USB fix from Greg KH:
"A single revert of a commit that caused problems in 5.14-rc5 for
5.14-rc6. It has been in linux-next almost all week, and has resolved
the issues that were reported on lots of different systems that were
not the platform that the change was originally tested on (gotta love
SoC cores used in multiple devices from multiple vendors...)"
* tag 'usb-5.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
Revert "usb: dwc3: gadget: Use list_replace_init() before traversing lists"
Here are some small IIO driver fixes for reported problems for 5.14-rc6
(no staging driver fixes at the moment).
All of them resolve reported issues and have been in linux-next all week
with no reported problems. Full details are in the shortlog.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'staging-5.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
Pull IIO driver fixes from Greg KH:
"Here are some small IIO driver fixes for reported problems for
5.14-rc6 (no staging driver fixes at the moment).
All of them resolve reported issues and have been in linux-next all
week with no reported problems. Full details are in the shortlog"
* tag 'staging-5.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
iio: adc: Fix incorrect exit of for-loop
iio: humidity: hdc100x: Add margin to the conversion time
dt-bindings: iio: st: Remove wrong items length check
iio: accel: fxls8962af: fix i2c dependency
iio: adis: set GPIO reset pin direction
iio: adc: ti-ads7950: Ensure CS is deasserted after reading channels
iio: accel: fxls8962af: fix potential use of uninitialized symbol
Pull i2c fixes from Wolfram Sang:
"One driver bugfix, a documentation bugfix, and an "uninitialized data"
leak fix for the core"
* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
Documentation: i2c: add i2c-sysfs into index
i2c: dev: zero out array used for i2c reads from userspace
i2c: iproc: fix race between client unreg and tasklet
If an SQPOLL based ring is newly created and an application issues an
io_uring_enter(2) system call on it, then we can return a spurious
-EOWNERDEAD error. This happens because there's nothing to submit, and
if the caller doesn't specify any other action, the initial error
assignment of -EOWNERDEAD never gets overwritten. This causes us to
return it directly, even if it isn't valid.
Move the error assignment into the actual failure case instead.
Cc: stable@vger.kernel.org
Fixes: d9d05217cb ("io_uring: stop SQPOLL submit on creator's death")
Reported-by: Sherlock Holo sherlockya@gmail.com
Link: https://github.com/axboe/liburing/issues/413
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Merge tag 'for-linus-5.14-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen fixes from Juergen Gross:
"A small cleanup patch and a fix of a rare race in the Xen evtchn
driver"
* tag 'for-linus-5.14-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen/events: Fix race in set_evtchn_to_irq
xen/events: remove redundant initialization of variable irq
* A fix to avoid passing -mno-relax to compilers that don't support it.
* A comment fix.
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Merge tag 'riscv-for-linus-5.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux
Pull RISC-V fixes from Palmer Dabbelt:
- avoid passing -mno-relax to compilers that don't support it
- a comment fix
* tag 'riscv-for-linus-5.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
riscv: Fix comment regarding kernel mapping overlapping with IS_ERR_VALUE
riscv: kexec: do not add '-mno-relax' flag if compiler doesn't support it
- fix to revert to the historic write behavior (Bart Van Assche)
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Merge tag 'configfs-5.14' of git://git.infradead.org/users/hch/configfs
Pull configfs fix from Christoph Hellwig:
- fix to revert to the historic write behavior (Bart Van Assche)
* tag 'configfs-5.14' of git://git.infradead.org/users/hch/configfs:
configfs: restore the kernel v5.13 text attribute write behavior
Merge misc fixes from Andrew Morton:
"7 patches.
Subsystems affected by this patch series: mm (kasan, mm/slub,
mm/madvise, and memcg), and lib"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
lib: use PFN_PHYS() in devmem_is_allowed()
mm/memcg: fix incorrect flushing of lruvec data in obj_stock
mm/madvise: report SIGBUS as -EFAULT for MADV_POPULATE_(READ|WRITE)
mm: slub: fix slub_debug disabling for list of slabs
slub: fix kmalloc_pagealloc_invalid_free unit test
kasan, slub: reset tag when printing address
kasan, kmemleak: reset tags when scanning block
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Merge tag '5.14-rc5-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6
Pull cifs fixes from Steve French:
"Four CIFS/SMB3 Fixes, all for stable, two relating to deferred close,
and one for the 'modefromsid' mount option (when 'idsfromsid' not
specified)"
* tag '5.14-rc5-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6:
cifs: Call close synchronously during unlink/rename/lease break.
cifs: Handle race conditions during rename
cifs: use the correct max-length for dentry_path_raw()
cifs: create sd context must be a multiple of 8
This Kselftest fixes update for Linux 5.14-rc6 consists of a single patch
to sgx test to fix Q1 and Q2 calculation.
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Merge tag 'linux-kselftest-fixes-5.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest
Pull Kselftest fix from Shuah Khan:
"A single patch to sgx test to fix Q1 and Q2 calculation"
* tag 'linux-kselftest-fixes-5.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
selftests/sgx: Fix Q1 and Q2 calculation in sigstruct.c
Internal tests found out that the latest code doesn't bring up 1PPS out
as expected. As a result of incorrect define used to round the time up
the time was round down to the past second boundary.
Fix define used for rounding to properly round up to the next Top of
second in ice_ptp_cfg_clkout to fix it.
Fixes: 172db5f91d ("ice: add support for auxiliary input/output pins")
Signed-off-by: Maciej Machnikowski <maciej.machnikowski@intel.com>
Tested-by: Sunitha Mekala <sunithax.d.mekala@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Link: https://lore.kernel.org/r/20210813165018.2196013-1-anthony.l.nguyen@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
The physical address may exceed 32 bits on 32-bit systems with more than
32 bits of physcial address. Use PFN_PHYS() in devmem_is_allowed(), or
the physical address may overflow and be truncated.
We found this bug when mapping a high addresses through devmem tool,
when CONFIG_STRICT_DEVMEM is enabled on the ARM with ARM_LPAE and devmem
is used to map a high address that is not in the iomem address range, an
unexpected error indicating no permission is returned.
This bug was initially introduced from v2.6.37, and the function was
moved to lib in v5.11.
Link: https://lkml.kernel.org/r/20210731025057.78825-1-wangliang101@huawei.com
Fixes: 087aaffcdf ("ARM: implement CONFIG_STRICT_DEVMEM by disabling access to RAM via /dev/mem")
Fixes: 527701eda5 ("lib: Add a generic version of devmem_is_allowed()")
Signed-off-by: Liang Wang <wangliang101@huawei.com>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Palmer Dabbelt <palmerdabbelt@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Liang Wang <wangliang101@huawei.com>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: <stable@vger.kernel.org> [2.6.37+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
When mod_objcg_state() is called with a pgdat that is different from
that in the obj_stock, the old lruvec data cached in obj_stock are
flushed out. Unfortunately, they were flushed to the new pgdat and so
the data go to the wrong node. This will screw up the slab data
reported in /sys/devices/system/node/node*/meminfo.
Fix that by flushing the data to the cached pgdat instead.
Link: https://lkml.kernel.org/r/20210802143834.30578-1-longman@redhat.com
Fixes: 68ac5b3c8d ("mm/memcg: cache vmstat data in percpu memcg_stock_pcp")
Signed-off-by: Waiman Long <longman@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Roman Gushchin <guro@fb.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Chris Down <chris@chrisdown.name>
Cc: Yafang Shao <laoar.shao@gmail.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Masayoshi Mizuma <msys.mizuma@gmail.com>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Waiman Long <longman@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Doing some extended tests and polishing the man page update for
MADV_POPULATE_(READ|WRITE), I realized that we end up converting also
SIGBUS (via -EFAULT) to -EINVAL, making it look like yet another
madvise() user error.
We want to report only problematic mappings and permission problems that
the user could have know as -EINVAL.
Let's not convert -EFAULT arising due to SIGBUS (or SIGSEGV) to -EINVAL,
but instead indicate -EFAULT to user space. While we could also convert
it to -ENOMEM, using -EFAULT looks more helpful when user space might
want to troubleshoot what's going wrong: MADV_POPULATE_(READ|WRITE) is
not part of an final Linux release and we can still adjust the behavior.
Link: https://lkml.kernel.org/r/20210726154932.102880-1-david@redhat.com
Fixes: 4ca9b3859d ("mm/madvise: introduce MADV_POPULATE_(READ|WRITE) to prefault page tables")
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Jann Horn <jannh@google.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Chris Zankel <chris@zankel.net>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Rolf Eike Beer <eike-kernel@sf-tec.de>
Cc: Ram Pai <linuxram@us.ibm.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Vijayanand Jitta reports:
Consider the scenario where CONFIG_SLUB_DEBUG_ON is set and we would
want to disable slub_debug for few slabs. Using boot parameter with
slub_debug=-,slab_name syntax doesn't work as expected i.e; only
disabling debugging for the specified list of slabs. Instead it
disables debugging for all slabs, which is wrong.
This patch fixes it by delaying the moment when the global slub_debug
flags variable is updated. In case a "slub_debug=-,slab_name" has been
passed, the global flags remain as initialized (depending on
CONFIG_SLUB_DEBUG_ON enabled or disabled) and are not simply reset to 0.
Link: https://lkml.kernel.org/r/8a3d992a-473a-467b-28a0-4ad2ff60ab82@suse.cz
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reported-by: Vijayanand Jitta <vjitta@codeaurora.org>
Reviewed-by: Vijayanand Jitta <vjitta@codeaurora.org>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Vinayak Menon <vinmenon@codeaurora.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The unit test kmalloc_pagealloc_invalid_free makes sure that for the
higher order slub allocation which goes to page allocator, the free is
called with the correct address i.e. the virtual address of the head
page.
Commit f227f0faf6 ("slub: fix unreclaimable slab stat for bulk free")
unified the free code paths for page allocator based slub allocations
but instead of using the address passed by the caller, it extracted the
address from the page. Thus making the unit test
kmalloc_pagealloc_invalid_free moot. So, fix this by using the address
passed by the caller.
Should we fix this? I think yes because dev expect kasan to catch these
type of programming bugs.
Link: https://lkml.kernel.org/r/20210802180819.1110165-1-shakeelb@google.com
Fixes: f227f0faf6 ("slub: fix unreclaimable slab stat for bulk free")
Signed-off-by: Shakeel Butt <shakeelb@google.com>
Reported-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Roman Gushchin <guro@fb.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The address still includes the tags when it is printed. With hardware
tag-based kasan enabled, we will get a false positive KASAN issue when
we access metadata.
Reset the tag before we access the metadata.
Link: https://lkml.kernel.org/r/20210804090957.12393-3-Kuan-Ying.Lee@mediatek.com
Fixes: aa1ef4d7b3 ("kasan, mm: reset tags when accessing metadata")
Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Reviewed-by: Marco Elver <elver@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chinwen Chang <chinwen.chang@mediatek.com>
Cc: Nicholas Tang <nicholas.tang@mediatek.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Patch series "kasan, slub: reset tag when printing address", v3.
With hardware tag-based kasan enabled, we reset the tag when we access
metadata to avoid from false alarm.
This patch (of 2):
Kmemleak needs to scan kernel memory to check memory leak. With hardware
tag-based kasan enabled, when it scans on the invalid slab and
dereference, the issue will occur as below.
Hardware tag-based KASAN doesn't use compiler instrumentation, we can not
use kasan_disable_current() to ignore tag check.
Based on the below report, there are 11 0xf7 granules, which amounts to
176 bytes, and the object is allocated from the kmalloc-256 cache. So
when kmemleak accesses the last 256-176 bytes, it causes faults, as those
are marked with KASAN_KMALLOC_REDZONE == KASAN_TAG_INVALID == 0xfe.
Thus, we reset tags before accessing metadata to avoid from false positives.
BUG: KASAN: out-of-bounds in scan_block+0x58/0x170
Read at addr f7ff0000c0074eb0 by task kmemleak/138
Pointer tag: [f7], memory tag: [fe]
CPU: 7 PID: 138 Comm: kmemleak Not tainted 5.14.0-rc2-00001-g8cae8cd89f05-dirty #134
Hardware name: linux,dummy-virt (DT)
Call trace:
dump_backtrace+0x0/0x1b0
show_stack+0x1c/0x30
dump_stack_lvl+0x68/0x84
print_address_description+0x7c/0x2b4
kasan_report+0x138/0x38c
__do_kernel_fault+0x190/0x1c4
do_tag_check_fault+0x78/0x90
do_mem_abort+0x44/0xb4
el1_abort+0x40/0x60
el1h_64_sync_handler+0xb4/0xd0
el1h_64_sync+0x78/0x7c
scan_block+0x58/0x170
scan_gray_list+0xdc/0x1a0
kmemleak_scan+0x2ac/0x560
kmemleak_scan_thread+0xb0/0xe0
kthread+0x154/0x160
ret_from_fork+0x10/0x18
Allocated by task 0:
kasan_save_stack+0x2c/0x60
__kasan_kmalloc+0xec/0x104
__kmalloc+0x224/0x3c4
__register_sysctl_paths+0x200/0x290
register_sysctl_table+0x2c/0x40
sysctl_init+0x20/0x34
proc_sys_init+0x3c/0x48
proc_root_init+0x80/0x9c
start_kernel+0x648/0x6a4
__primary_switched+0xc0/0xc8
Freed by task 0:
kasan_save_stack+0x2c/0x60
kasan_set_track+0x2c/0x40
kasan_set_free_info+0x44/0x54
____kasan_slab_free.constprop.0+0x150/0x1b0
__kasan_slab_free+0x14/0x20
slab_free_freelist_hook+0xa4/0x1fc
kfree+0x1e8/0x30c
put_fs_context+0x124/0x220
vfs_kern_mount.part.0+0x60/0xd4
kern_mount+0x24/0x4c
bdev_cache_init+0x70/0x9c
vfs_caches_init+0xdc/0xf4
start_kernel+0x638/0x6a4
__primary_switched+0xc0/0xc8
The buggy address belongs to the object at ffff0000c0074e00
which belongs to the cache kmalloc-256 of size 256
The buggy address is located 176 bytes inside of
256-byte region [ffff0000c0074e00, ffff0000c0074f00)
The buggy address belongs to the page:
page:(____ptrval____) refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x100074
head:(____ptrval____) order:2 compound_mapcount:0 compound_pincount:0
flags: 0xbfffc0000010200(slab|head|node=0|zone=2|lastcpupid=0xffff|kasantag=0x0)
raw: 0bfffc0000010200 0000000000000000 dead000000000122 f5ff0000c0002300
raw: 0000000000000000 0000000000200020 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff0000c0074c00: f0 f0 f0 f0 f0 f0 f0 f0 f0 fe fe fe fe fe fe fe
ffff0000c0074d00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
>ffff0000c0074e00: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 fe fe fe fe fe
^
ffff0000c0074f00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
ffff0000c0075000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Disabling lock debugging due to kernel taint
kmemleak: 181 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
Link: https://lkml.kernel.org/r/20210804090957.12393-1-Kuan-Ying.Lee@mediatek.com
Link: https://lkml.kernel.org/r/20210804090957.12393-2-Kuan-Ying.Lee@mediatek.com
Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Marco Elver <elver@google.com>
Cc: Nicholas Tang <nicholas.tang@mediatek.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Chinwen Chang <chinwen.chang@mediatek.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Merge tag 'block-5.14-2021-08-13' of git://git.kernel.dk/linux-block
Pull block fixes from Jens Axboe:
"A few fixes for block that should go into 5.14:
- Revert the mq-deadline cgroup addition. More work is needed on this
front, let's revert it for now and get it right before having it in
a released kernel (Tejun)
- blk-iocost lockdep fix (Ming)
- nbd double completion fix (Xie)
- Fix for non-idling when clearing the shared tag flag (Yu)"
* tag 'block-5.14-2021-08-13' of git://git.kernel.dk/linux-block:
nbd: Aovid double completion of a request
blk-mq: clear active_queues before clearing BLK_MQ_F_TAG_QUEUE_SHARED
Revert "block/mq-deadline: Add cgroup support"
blk-iocost: fix lockdep warning on blkcg->lock
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Merge tag 'io_uring-5.14-2021-08-13' of git://git.kernel.dk/linux-block
Pull io_uring fixes from Jens Axboe:
"A bit bigger than the previous weeks, but mostly just a few stable
bound fixes. In detail:
- Followup fixes to patches from last week for io-wq, turns out they
weren't complete (Hao)
- Two lockdep reported fixes out of the RT camp (me)
- Sync the io_uring-cp example with liburing, as a few bug fixes
never made it to the kernel carried version (me)
- SQPOLL related TIF_NOTIFY_SIGNAL fix (Nadav)
- Use WRITE_ONCE() when writing sq flags (Nadav)
- io_rsrc_put_work() deadlock fix (Pavel)"
* tag 'io_uring-5.14-2021-08-13' of git://git.kernel.dk/linux-block:
tools/io_uring/io_uring-cp: sync with liburing example
io_uring: fix ctx-exit io_rsrc_put_work() deadlock
io_uring: drop ctx->uring_lock before flushing work item
io-wq: fix IO_WORKER_F_FIXED issue in create_io_worker()
io-wq: fix bug of creating io-wokers unconditionally
io_uring: rsrc ref lock needs to be IRQ safe
io_uring: Use WRITE_ONCE() when writing to sq_flags
io_uring: clear TIF_NOTIFY_SIGNAL when running task work
- Fix the Kconfig dependency for Qualcomm SM8350 pin
controller.
- Fix pin biasing fallback behaviour on the Mediatek pin
controller.
- Fix the GPIO numbering scheme for Intel Tiger Lake-H
to correspond to the products that are now actually out
on the market.
- Fix a pin control function itemization in the Sunxi driver
out-of-bounds access bug.
- Fix disable clocking for the RISC-V K210 pin controller on
the errorpath.
- Fix a system shutdown bug affecting AMD Ryzen-based laptops,
the system would not suspend but just bounce back up.
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Merge tag 'pinctrl-v5.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl
Pull pin control fixes from Linus Walleij:
"An assortment of pin control fixes of varying importance, the most
important ones affecting Intel and AMD laptops turned up the recent
few days so it's time to push this to your tree.
- Fix the Kconfig dependency for Qualcomm SM8350 pin controller
- Fix pin biasing fallback behaviour on the Mediatek pin controller
- Fix the GPIO numbering scheme for Intel Tiger Lake-H to correspond
to the products that are now actually out on the market
- Fix a pin control function itemization in the Sunxi driver
out-of-bounds access bug
- Fix disable clocking for the RISC-V K210 pin controller on the
errorpath
- Fix a system shutdown bug affecting AMD Ryzen-based laptops, the
system would not suspend but just bounce back up"
* tag 'pinctrl-v5.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
pinctrl: amd: Fix an issue with shutdown when system set to s0ix
pinctrl: k210: Fix k210_fpioa_probe()
pinctrl: sunxi: Don't underestimate number of functions
pinctrl: tigerlake: Fix GPIO mapping for newer version of software
pinctrl: mediatek: Fix fallback behavior for bias_set_combo
pinctrl: qcom: fix GPIOLIB dependencies
The patch be7ecbd240: "soc: fsl: qe: convert QE interrupt
controller to platform_device" from Aug 3, 2021, leads to the
following static checker warning:
drivers/soc/fsl/qe/qe_ic.c:438 qe_ic_init()
warn: unsigned 'qe_ic->virq_low' is never less than zero.
In old variant irq_of_parse_and_map() returns zero if failed so
unsigned int for virq_high/virq_low was ok.
In new variant platform_get_irq() returns negative error codes
if failed so we need to use int for virq_high/virq_low.
Also simplify high_handler checking and remove the curly braces
to make checkpatch happy.
Fixes: be7ecbd240 ("soc: fsl: qe: convert QE interrupt controller to platform_device")
Signed-off-by: Maxim Kochetkov <fido_max@inbox.ru>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Li Yang <leoyang.li@nxp.com>
Jakub Kicinski says:
====================
bnxt: Tx NAPI disabling resiliency improvements
A lockdep warning was triggered by netpoll because napi poll
was taking the xmit lock. Fix that and a couple more issues
noticed while reading the code.
====================
Link: https://lore.kernel.org/r/20210812214242.578039-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Drivers should count packets they are dropping.
Fixes: c0c050c58d ("bnxt_en: New Broadcom ethernet driver.")
Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Reviewed-by: Edwin Peer <edwin.peer@broadcom.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
skbs are freed on error and not put on the ring. We may, however,
be in a situation where we're freeing the last skb of a batch,
and there is a doorbell ring pending because of xmit_more() being
true earlier. Make sure we ring the door bell in such situations.
Since errors are rare don't pay attention to xmit_more() and just
always flush the pending frames.
The busy case should be safe to be left alone because it can
only happen if start_xmit races with completions and they
both enable the queue. In that case the kick can't be pending.
Noticed while reading the code.
Fixes: 4d172f21ce ("bnxt_en: Implement xmit_more.")
Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Reviewed-by: Edwin Peer <edwin.peer@broadcom.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
napi schedules DIM, napi has to be disabled first,
then DIM canceled.
Noticed while reading the code.
Fixes: 0bc0b97fca ("bnxt_en: cleanup DIM work on device shutdown")
Fixes: 6a8788f256 ("bnxt_en: add support for software dynamic interrupt moderation")
Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Reviewed-by: Edwin Peer <edwin.peer@broadcom.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
We can't take the tx lock from the napi poll routine, because
netpoll can poll napi at any moment, including with the tx lock
already held.
The tx lock is protecting against two paths - the disable
path, and (as Michael points out) the NETDEV_TX_BUSY case
which may occur if NAPI completions race with start_xmit
and both decide to re-enable the queue.
For the disable/ifdown path use synchronize_net() to make sure
closing the device does not race we restarting the queues.
Annotate accesses to dev_state against data races.
For the NAPI cleanup vs start_xmit path - appropriate barriers
are already in place in the main spot where Tx queue is stopped
but we need to do the same careful dance in the TX_BUSY case.
Fixes: c0c050c58d ("bnxt_en: New Broadcom ethernet driver.")
Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Reviewed-by: Edwin Peer <edwin.peer@broadcom.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
There is a race between iterating over requests in
nbd_clear_que() and completing requests in recv_work(),
which can lead to double completion of a request.
To fix it, flush the recv worker before iterating over
the requests and don't abort the completed request
while iterating.
Fixes: 96d97e1782 ("nbd: clear_sock on netlink disconnect")
Reported-by: Jiang Yadong <jiangyadong@bytedance.com>
Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Link: https://lore.kernel.org/r/20210813151330.96-1-xieyongji@bytedance.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Prevent regressions related to zero-extension metadata handling during
dead code sanitization.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210812151811.184086-3-iii@linux.ibm.com
"access skb fields ok" verifier test fails on s390 with the "verifier
bug. zext_dst is set, but no reg is defined" message. The first insns
of the test prog are ...
0: 61 01 00 00 00 00 00 00 ldxw %r0,[%r1+0]
8: 35 00 00 01 00 00 00 00 jge %r0,0,1
10: 61 01 00 08 00 00 00 00 ldxw %r0,[%r1+8]
... and the 3rd one is dead (this does not look intentional to me, but
this is a separate topic).
sanitize_dead_code() converts dead insns into "ja -1", but keeps
zext_dst. When opt_subreg_zext_lo32_rnd_hi32() tries to parse such
an insn, it sees this discrepancy and bails. This problem can be seen
only with JITs whose bpf_jit_needs_zext() returns true.
Fix by clearning dead insns' zext_dst.
The commits that contributed to this problem are:
1. 5aa5bd14c5 ("bpf: add initial suite for selftests"), which
introduced the test with the dead code.
2. 5327ed3d44 ("bpf: verifier: mark verified-insn with
sub-register zext flag"), which introduced the zext_dst flag.
3. 83a2881903 ("bpf: Account for BPF_FETCH in
insn_has_def32()"), which introduced the sanity check.
4. 9183671af6 ("bpf: Fix leakage under speculation on
mispredicted branches"), which bisect points to.
It's best to fix this on stable branches that contain the second one,
since that's the point where the inconsistency was introduced.
Fixes: 5327ed3d44 ("bpf: verifier: mark verified-insn with sub-register zext flag")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210812151811.184086-2-iii@linux.ibm.com
This example is missing a few fixes that are in the liburing version,
synchronize with the upstream version.
Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
We run a test that delete and recover devcies frequently(two devices on
the same host), and we found that 'active_queues' is super big after a
period of time.
If device a and device b share a tag set, and a is deleted, then
blk_mq_exit_queue() will clear BLK_MQ_F_TAG_QUEUE_SHARED because there
is only one queue that are using the tag set. However, if b is still
active, the active_queues of b might never be cleared even if b is
deleted.
Thus clear active_queues before BLK_MQ_F_TAG_QUEUE_SHARED is cleared.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20210731062130.1533893-1-yukuai3@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Fixes: 77e89afc25 ("PCI/MSI: Protect msi_desc::masked for multi-MSI")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
The error handling code in tpci200_register does not free interface_regs
allocated by ioremap and the current version of error handling code is
problematic.
Fix this by refactoring the error handling code and free interface_regs
when necessary.
Fixes: 43986798fd ("ipack: add error handling for ioremap_nocache")
Cc: stable@vger.kernel.org
Reported-by: Dongliang Mu <mudongliangabcd@gmail.com>
Signed-off-by: Dongliang Mu <mudongliangabcd@gmail.com>
Link: https://lore.kernel.org/r/20210810100323.3938492-2-mudongliangabcd@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The function tpci200_register called by tpci200_install and
tpci200_unregister called by tpci200_uninstall are in pair. However,
tpci200_unregister has some cleanup operations not in the
tpci200_register. So the error handling code of tpci200_pci_probe has
many different double free issues.
Fix this problem by moving those cleanup operations out of
tpci200_unregister, into tpci200_pci_remove and reverting
the previous commit 9272e5d002 ("ipack/carriers/tpci200:
Fix a double free in tpci200_pci_probe").
Fixes: 9272e5d002 ("ipack/carriers/tpci200: Fix a double free in tpci200_pci_probe")
Cc: stable@vger.kernel.org
Reported-by: Dongliang Mu <mudongliangabcd@gmail.com>
Signed-off-by: Dongliang Mu <mudongliangabcd@gmail.com>
Link: https://lore.kernel.org/r/20210810100323.3938492-1-mudongliangabcd@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
During suspend/resume NGD remote instance is power cycled along
with remotely controlled bam dma engine.
So Reset the dma configuration during this suspend resume path
so that we are not dealing with any stale dma setup.
Without this transactions timeout after first suspend resume path.
Fixes: 917809e228 ("slimbus: ngd: Add qcom SLIMBus NGD driver")
Cc: <stable@vger.kernel.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210809082428.11236-5-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
For some reason we ended up using wrong device in some places for pm_runtime calls.
Fix this so that NGG driver can do runtime pm correctly.
Fixes: 917809e228 ("slimbus: ngd: Add qcom SLIMBus NGD driver")
Cc: <stable@vger.kernel.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210809082428.11236-4-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
In some usecases transaction ids are dynamically allocated inside
the controller driver after sending the messages which have generic
acknowledge responses. So check for this before refcounting pm_runtime.
Without this we would end up imbalancing runtime pm count by
doing pm_runtime_put() in both slim_do_transfer() and slim_msg_response()
for a single pm_runtime_get() in slim_do_transfer()
Fixes: d3062a2109 ("slimbus: messaging: add slim_alloc/free_txn_tid()")
Cc: <stable@vger.kernel.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210809082428.11236-3-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
As tid is unsigned its hard to figure out if the tid is valid or
invalid. So Start the transaction ids from 1 instead of zero
so that we could differentiate between a valid tid and invalid tids
This is useful in cases where controller would add a tid for controller
specific transfers.
Fixes: d3062a2109 ("slimbus: messaging: add slim_alloc/free_txn_tid()")
Cc: <stable@vger.kernel.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210809082428.11236-2-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Add yet another spinlock for the TDP MMU and take it when marking indirect
shadow pages unsync. When using the TDP MMU and L1 is running L2(s) with
nested TDP, KVM may encounter shadow pages for the TDP entries managed by
L1 (controlling L2) when handling a TDP MMU page fault. The unsync logic
is not thread safe, e.g. the kvm_mmu_page fields are not atomic, and
misbehaves when a shadow page is marked unsync via a TDP MMU page fault,
which runs with mmu_lock held for read, not write.
Lack of a critical section manifests most visibly as an underflow of
unsync_children in clear_unsync_child_bit() due to unsync_children being
corrupted when multiple CPUs write it without a critical section and
without atomic operations. But underflow is the best case scenario. The
worst case scenario is that unsync_children prematurely hits '0' and
leads to guest memory corruption due to KVM neglecting to properly sync
shadow pages.
Use an entirely new spinlock even though piggybacking tdp_mmu_pages_lock
would functionally be ok. Usurping the lock could degrade performance when
building upper level page tables on different vCPUs, especially since the
unsync flow could hold the lock for a comparatively long time depending on
the number of indirect shadow pages and the depth of the paging tree.
For simplicity, take the lock for all MMUs, even though KVM could fairly
easily know that mmu_lock is held for write. If mmu_lock is held for
write, there cannot be contention for the inner spinlock, and marking
shadow pages unsync across multiple vCPUs will be slow enough that
bouncing the kvm_arch cacheline should be in the noise.
Note, even though L2 could theoretically be given access to its own EPT
entries, a nested MMU must hold mmu_lock for write and thus cannot race
against a TDP MMU page fault. I.e. the additional spinlock only _needs_ to
be taken by the TDP MMU, as opposed to being taken by any MMU for a VM
that is running with the TDP MMU enabled. Holding mmu_lock for read also
prevents the indirect shadow page from being freed. But as above, keep
it simple and always take the lock.
Alternative #1, the TDP MMU could simply pass "false" for can_unsync and
effectively disable unsync behavior for nested TDP. Write protecting leaf
shadow pages is unlikely to noticeably impact traditional L1 VMMs, as such
VMMs typically don't modify TDP entries, but the same may not hold true for
non-standard use cases and/or VMMs that are migrating physical pages (from
L1's perspective).
Alternative #2, the unsync logic could be made thread safe. In theory,
simply converting all relevant kvm_mmu_page fields to atomics and using
atomic bitops for the bitmap would suffice. However, (a) an in-depth audit
would be required, (b) the code churn would be substantial, and (c) legacy
shadow paging would incur additional atomic operations in performance
sensitive paths for no benefit (to legacy shadow paging).
Fixes: a2855afc7e ("KVM: x86/mmu: Allow parallel page faults for the TDP MMU")
Cc: stable@vger.kernel.org
Cc: Ben Gardon <bgardon@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210812181815.3378104-1-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Set the min_level for the TDP iterator at the root level when zapping all
SPTEs to optimize the iterator's try_step_down(). Zapping a non-leaf
SPTE will recursively zap all its children, thus there is no need for the
iterator to attempt to step down. This avoids rereading the top-level
SPTEs after they are zapped by causing try_step_down() to short-circuit.
In most cases, optimizing try_step_down() will be in the noise as the cost
of zapping SPTEs completely dominates the overall time. The optimization
is however helpful if the zap occurs with relatively few SPTEs, e.g. if KVM
is zapping in response to multiple memslot updates when userspace is adding
and removing read-only memslots for option ROMs. In that case, the task
doing the zapping likely isn't a vCPU thread, but it still holds mmu_lock
for read and thus can be a noisy neighbor of sorts.
Reviewed-by: Ben Gardon <bgardon@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210812181414.3376143-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Pass "all ones" as the end GFN to signal "zap all" for the TDP MMU and
really zap all SPTEs in this case. As is, zap_gfn_range() skips non-leaf
SPTEs whose range exceeds the range to be zapped. If shadow_phys_bits is
not aligned to the range size of top-level SPTEs, e.g. 512gb with 4-level
paging, the "zap all" flows will skip top-level SPTEs whose range extends
beyond shadow_phys_bits and leak their SPs when the VM is destroyed.
Use the current upper bound (based on host.MAXPHYADDR) to detect that the
caller wants to zap all SPTEs, e.g. instead of using the max theoretical
gfn, 1 << (52 - 12). The more precise upper bound allows the TDP iterator
to terminate its walk earlier when running on hosts with MAXPHYADDR < 52.
Add a WARN on kmv->arch.tdp_mmu_pages when the TDP MMU is destroyed to
help future debuggers should KVM decide to leak SPTEs again.
The bug is most easily reproduced by running (and unloading!) KVM in a
VM whose host.MAXPHYADDR < 39, as the SPTE for gfn=0 will be skipped.
=============================================================================
BUG kvm_mmu_page_header (Not tainted): Objects remaining in kvm_mmu_page_header on __kmem_cache_shutdown()
-----------------------------------------------------------------------------
Slab 0x000000004d8f7af1 objects=22 used=2 fp=0x00000000624d29ac flags=0x4000000000000200(slab|zone=1)
CPU: 0 PID: 1582 Comm: rmmod Not tainted 5.14.0-rc2+ #420
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015
Call Trace:
dump_stack_lvl+0x45/0x59
slab_err+0x95/0xc9
__kmem_cache_shutdown.cold+0x3c/0x158
kmem_cache_destroy+0x3d/0xf0
kvm_mmu_module_exit+0xa/0x30 [kvm]
kvm_arch_exit+0x5d/0x90 [kvm]
kvm_exit+0x78/0x90 [kvm]
vmx_exit+0x1a/0x50 [kvm_intel]
__x64_sys_delete_module+0x13f/0x220
do_syscall_64+0x3b/0xc0
entry_SYSCALL_64_after_hwframe+0x44/0xae
Fixes: faaf05b00a ("kvm: x86/mmu: Support zapping SPTEs in the TDP MMU")
Cc: stable@vger.kernel.org
Cc: Ben Gardon <bgardon@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210812181414.3376143-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
