1. 14 9月, 2018 5 次提交
    • M
      xen/gntdev: fix up blockable calls to mn_invl_range_start · 58a57569
      Michal Hocko 提交于
      Patch series "mmu_notifiers follow ups".
      
      Tetsuo has noticed some fallouts from 93065ac7 ("mm, oom: distinguish
      blockable mode for mmu notifiers").  One of them has been fixed and picked
      up by AMD/DRM maintainer [1].  XEN issue is fixed by patch 1.  I have also
      clarified expectations about blockable semantic of invalidate_range_end.
      Finally the last patch removes MMU_INVALIDATE_DOES_NOT_BLOCK which is no
      longer used nor needed.
      
      [1] http://lkml.kernel.org/r/20180824135257.GU29735@dhcp22.suse.cz
      
      This patch (of 3):
      
      93065ac7 ("mm, oom: distinguish blockable mode for mmu notifiers") has
      introduced blockable parameter to all mmu_notifiers and the notifier has
      to back off when called in !blockable case and it could block down the
      road.
      
      The above commit implemented that for mn_invl_range_start but both
      in_range checks are done unconditionally regardless of the blockable mode
      and as such they would fail all the time for regular calls.  Fix this by
      checking blockable parameter as well.
      
      Once we are there we can remove the stale TODO.  The lock has to be
      sleepable because we wait for completion down in gnttab_unmap_refs_sync.
      
      Link: http://lkml.kernel.org/r/20180827112623.8992-2-mhocko@kernel.org
      Fixes: 93065ac7 ("mm, oom: distinguish blockable mode for mmu notifiers")
      Signed-off-by: NMichal Hocko <mhocko@suse.com>
      Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
      Cc: Juergen Gross <jgross@suse.com>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Jerome Glisse <jglisse@redhat.com>
      Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
      Reviewed-by: NJuergen Gross <jgross@suse.com>
      Signed-off-by: NBoris Ostrovsky <boris.ostrovsky@oracle.com>
      58a57569
    • J
      xen: fix GCC warning and remove duplicate EVTCHN_ROW/EVTCHN_COL usage · 4dca864b
      Josh Abraham 提交于
      This patch removes duplicate macro useage in events_base.c.
      
      It also fixes gcc warning:
      variable ‘col’ set but not used [-Wunused-but-set-variable]
      Signed-off-by: NJoshua Abraham <j.abraham1776@gmail.com>
      Reviewed-by: NJuergen Gross <jgross@suse.com>
      Signed-off-by: NBoris Ostrovsky <boris.ostrovsky@oracle.com>
      4dca864b
    • O
      xen: avoid crash in disable_hotplug_cpu · 3366cdb6
      Olaf Hering 提交于
      The command 'xl vcpu-set 0 0', issued in dom0, will crash dom0:
      
      BUG: unable to handle kernel NULL pointer dereference at 00000000000002d8
      PGD 0 P4D 0
      Oops: 0000 [#1] PREEMPT SMP NOPTI
      CPU: 7 PID: 65 Comm: xenwatch Not tainted 4.19.0-rc2-1.ga9462db-default #1 openSUSE Tumbleweed (unreleased)
      Hardware name: Intel Corporation S5520UR/S5520UR, BIOS S5500.86B.01.00.0050.050620101605 05/06/2010
      RIP: e030:device_offline+0x9/0xb0
      Code: 77 24 00 e9 ce fe ff ff 48 8b 13 e9 68 ff ff ff 48 8b 13 e9 29 ff ff ff 48 8b 13 e9 ea fe ff ff 90 66 66 66 66 90 41 54 55 53 <f6> 87 d8 02 00 00 01 0f 85 88 00 00 00 48 c7 c2 20 09 60 81 31 f6
      RSP: e02b:ffffc90040f27e80 EFLAGS: 00010203
      RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
      RDX: ffff8801f3800000 RSI: ffffc90040f27e70 RDI: 0000000000000000
      RBP: 0000000000000000 R08: ffffffff820e47b3 R09: 0000000000000000
      R10: 0000000000007ff0 R11: 0000000000000000 R12: ffffffff822e6d30
      R13: dead000000000200 R14: dead000000000100 R15: ffffffff8158b4e0
      FS:  00007ffa595158c0(0000) GS:ffff8801f39c0000(0000) knlGS:0000000000000000
      CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
      CR2: 00000000000002d8 CR3: 00000001d9602000 CR4: 0000000000002660
      Call Trace:
       handle_vcpu_hotplug_event+0xb5/0xc0
       xenwatch_thread+0x80/0x140
       ? wait_woken+0x80/0x80
       kthread+0x112/0x130
       ? kthread_create_worker_on_cpu+0x40/0x40
       ret_from_fork+0x3a/0x50
      
      This happens because handle_vcpu_hotplug_event is called twice. In the
      first iteration cpu_present is still true, in the second iteration
      cpu_present is false which causes get_cpu_device to return NULL.
      In case of cpu#0, cpu_online is apparently always true.
      
      Fix this crash by checking if the cpu can be hotplugged, which is false
      for a cpu that was just removed.
      
      Also check if the cpu was actually offlined by device_remove, otherwise
      leave the cpu_present state as it is.
      
      Rearrange to code to do all work with device_hotplug_lock held.
      Signed-off-by: NOlaf Hering <olaf@aepfle.de>
      Reviewed-by: NJuergen Gross <jgross@suse.com>
      Signed-off-by: NBoris Ostrovsky <boris.ostrovsky@oracle.com>
      3366cdb6
    • M
      xen/balloon: add runtime control for scrubbing ballooned out pages · 197ecb38
      Marek Marczykowski-Górecki 提交于
      Scrubbing pages on initial balloon down can take some time, especially
      in nested virtualization case (nested EPT is slow). When HVM/PVH guest is
      started with memory= significantly lower than maxmem=, all the extra
      pages will be scrubbed before returning to Xen. But since most of them
      weren't used at all at that point, Xen needs to populate them first
      (from populate-on-demand pool). In nested virt case (Xen inside KVM)
      this slows down the guest boot by 15-30s with just 1.5GB needed to be
      returned to Xen.
      
      Add runtime parameter to enable/disable it, to allow initially disabling
      scrubbing, then enable it back during boot (for example in initramfs).
      Such usage relies on assumption that a) most pages ballooned out during
      initial boot weren't used at all, and b) even if they were, very few
      secrets are in the guest at that time (before any serious userspace
      kicks in).
      Convert CONFIG_XEN_SCRUB_PAGES to CONFIG_XEN_SCRUB_PAGES_DEFAULT (also
      enabled by default), controlling default value for the new runtime
      switch.
      Signed-off-by: NMarek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
      Reviewed-by: NJuergen Gross <jgross@suse.com>
      Signed-off-by: NBoris Ostrovsky <boris.ostrovsky@oracle.com>
      197ecb38
    • V
      xen/manage: don't complain about an empty value in control/sysrq node · 87dffe86
      Vitaly Kuznetsov 提交于
      When guest receives a sysrq request from the host it acknowledges it by
      writing '\0' to control/sysrq xenstore node. This, however, make xenstore
      watch fire again but xenbus_scanf() fails to parse empty value with "%c"
      format string:
      
       sysrq: SysRq : Emergency Sync
       Emergency Sync complete
       xen:manage: Error -34 reading sysrq code in control/sysrq
      
      Ignore -ERANGE the same way we already ignore -ENOENT, empty value in
      control/sysrq is totally legal.
      Signed-off-by: NVitaly Kuznetsov <vkuznets@redhat.com>
      Reviewed-by: NWei Liu <wei.liu2@citrix.com>
      Signed-off-by: NBoris Ostrovsky <boris.ostrovsky@oracle.com>
      87dffe86
  2. 10 9月, 2018 1 次提交
  3. 09 9月, 2018 10 次提交
    • L
      Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 9a568276
      Linus Torvalds 提交于
      Pull x86 fixes from Thomas Gleixner:
       "A set of fixes for x86:
      
         - Prevent multiplication result truncation on 32bit. Introduced with
           the early timestamp reworrk.
      
         - Ensure microcode revision storage to be consistent under all
           circumstances
      
         - Prevent write tearing of PTEs
      
         - Prevent confusion of user and kernel reegisters when dumping fatal
           signals verbosely
      
         - Make an error return value in a failure path of the vector
           allocation negative. Returning EINVAL might the caller assume
           success and causes further wreckage.
      
         - A trivial kernel doc warning fix"
      
      * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        x86/mm: Use WRITE_ONCE() when setting PTEs
        x86/apic/vector: Make error return value negative
        x86/process: Don't mix user/kernel regs in 64bit __show_regs()
        x86/tsc: Prevent result truncation on 32bit
        x86: Fix kernel-doc atomic.h warnings
        x86/microcode: Update the new microcode revision unconditionally
        x86/microcode: Make sure boot_cpu_data.microcode is up-to-date
      9a568276
    • L
      Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 3567994a
      Linus Torvalds 提交于
      Pull timekeeping fixes from Thomas Gleixner:
       "Two fixes for timekeeping:
      
         - Revert to the previous kthread based update, which is unfortunately
           required due to lock ordering issues. The removal caused boot
           failures on old Core2 machines. Add a proper comment why the thread
           needs to stay to prevent accidental removal in the future.
      
         - Fix a silly typo in a function declaration"
      
      * 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        clocksource: Revert "Remove kthread"
        timekeeping: Fix declaration of read_persistent_wall_and_boot_offset()
      3567994a
    • L
      Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 225ad3cf
      Linus Torvalds 提交于
      Pull irqchip fix from Thomas Gleixner:
       "A single fix to prevent allocating excessive memory in the GIC/ITS
        driver.
      
        While the subject of the patch might suggest otherwise this is a real
        fix as some SoCs exceed the memory allocation limits and fail to boot"
      
      * 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        irqchip/gic-v3-its: Cap lpi_id_bits to reduce memory footprint
      225ad3cf
    • L
      Merge branch 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · e0a0d058
      Linus Torvalds 提交于
      Pull cpu hotplug fixes from Thomas Gleixner:
       "Two fixes for the hotplug state machine code:
      
         - Move the misplaces smb() in the hotplug thread function to the
           proper place, otherwise a half update control struct could be
           observed
      
         - Prevent state corruption on error rollback, which causes the state
           to advance by one and as a consequence skip it in the bringup
           sequence"
      
      * 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        cpu/hotplug: Prevent state corruption on error rollback
        cpu/hotplug: Adjust misplaced smb() in cpuhp_thread_fun()
      e0a0d058
    • L
      Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random · 3243a89d
      Linus Torvalds 提交于
      Pull random driver fix from Ted Ts'o:
       "Fix things so the choice of whether or not to trust RDRAND to
        initialize the CRNG is configurable via the boot option
        random.trust_cpu={on,off}"
      
      * tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random:
        random: make CPU trust a boot parameter
      3243a89d
    • L
      Merge tag 'kbuild-fixes-v4.19' of... · 1d225777
      Linus Torvalds 提交于
      Merge tag 'kbuild-fixes-v4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
      
      Pull Kbuild fixes from Masahiro Yamada:
      
       - make setlocalversion more robust about -dirty check
      
       - loosen the pkg-config requirement for Kconfig
      
       - change missing depmod to a warning from an error
      
       - warn modules_install when System.map is missing
      
      * tag 'kbuild-fixes-v4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
        kbuild: modules_install: warn when missing System.map file
        kbuild: make missing $DEPMOD a Warning instead of an Error
        kconfig: do not require pkg-config on make {menu,n}config
        kconfig: remove a spurious self-assignment
        scripts/setlocalversion: git: Make -dirty check more robust
      1d225777
    • R
      kbuild: modules_install: warn when missing System.map file · f0b0d88a
      Randy Dunlap 提交于
      If there is no System.map file for "make modules_install",
      scripts/depmod.sh will silently exit with success, having done
      nothing.  Since this is an unexpected situation, change it to
      report a Warning for the missing file.  The behavior is not
      changed except for the Warning message.
      
      The (previous) silent success and new Warning can be reproduced
      by:
      $ make mrproper; make defconfig
      $ make modules; make modules_install
      
      and since System.map is produced by "make vmlinux", the steps
      above omit producing the System.map file.
      Reported-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
      Signed-off-by: NRandy Dunlap <rdunlap@infradead.org>
      Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
      f0b0d88a
    • L
      Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm · f8f65382
      Linus Torvalds 提交于
      Pull KVM fixes from Radim Krčmář:
       "ARM:
         - Fix a VFP corruption in 32-bit guest
         - Add missing cache invalidation for CoW pages
         - Two small cleanups
      
        s390:
         - Fallout from the hugetlbfs support: pfmf interpretion and locking
         - VSIE: fix keywrapping for nested guests
      
        PPC:
         - Fix a bug where pages might not get marked dirty, causing guest
           memory corruption on migration
         - Fix a bug causing reads from guest memory to use the wrong guest
           real address for very large HPT guests (>256G of memory), leading
           to failures in instruction emulation.
      
        x86:
         - Fix out of bound access from malicious pv ipi hypercalls
           (introduced in rc1)
         - Fix delivery of pending interrupts when entering a nested guest,
           preventing arbitrarily late injection
         - Sanitize kvm_stat output after destroying a guest
         - Fix infinite loop when emulating a nested guest page fault and
           improve the surrounding emulation code
         - Two minor cleanups"
      
      * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (28 commits)
        KVM: LAPIC: Fix pv ipis out-of-bounds access
        KVM: nVMX: Fix loss of pending IRQ/NMI before entering L2
        arm64: KVM: Remove pgd_lock
        KVM: Remove obsolete kvm_unmap_hva notifier backend
        arm64: KVM: Only force FPEXC32_EL2.EN if trapping FPSIMD
        KVM: arm/arm64: Clean dcache to PoC when changing PTE due to CoW
        KVM: s390: Properly lock mm context allow_gmap_hpage_1m setting
        KVM: s390: vsie: copy wrapping keys to right place
        KVM: s390: Fix pfmf and conditional skey emulation
        tools/kvm_stat: re-animate display of dead guests
        tools/kvm_stat: indicate dead guests as such
        tools/kvm_stat: handle guest removals more gracefully
        tools/kvm_stat: don't reset stats when setting PID filter for debugfs
        tools/kvm_stat: fix updates for dead guests
        tools/kvm_stat: fix handling of invalid paths in debugfs provider
        tools/kvm_stat: fix python3 issues
        KVM: x86: Unexport x86_emulate_instruction()
        KVM: x86: Rename emulate_instruction() to kvm_emulate_instruction()
        KVM: x86: Do not re-{try,execute} after failed emulation in L2
        KVM: x86: Default to not allowing emulation retry in kvm_mmu_page_fault
        ...
      f8f65382
    • L
      Merge tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc · 0f3aa48a
      Linus Torvalds 提交于
      Pull ARM SoC fixes from Olof Johansson:
       "A few more fixes who have trickled in:
      
         - MMC bus width fixup for some Allwinner platforms
      
         - Fix for NULL deref in ti-aemif when no platform data is passed in
      
         - Fix div by 0 in SCMI code
      
         - Add a missing module alias in a new RPi driver"
      
      * tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
        memory: ti-aemif: fix a potential NULL-pointer dereference
        firmware: arm_scmi: fix divide by zero when sustained_perf_level is zero
        hwmon: rpi: add module alias to raspberrypi-hwmon
        arm64: allwinner: dts: h6: fix Pine H64 MMC bus width
      0f3aa48a
    • O
      Merge tag 'sunxi-fixes-for-4.19' of... · a132bb90
      Olof Johansson 提交于
      Merge tag 'sunxi-fixes-for-4.19' of https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux into fixes
      
      Allwinner fixes for 4.19
      
      Just one fix for H6 mmc on the Pine H64: the mmc bus width was missing
      from the device tree. This was added in 4.19-rc1.
      
      * tag 'sunxi-fixes-for-4.19' of https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux:
        arm64: allwinner: dts: h6: fix Pine H64 MMC bus width
      Signed-off-by: NOlof Johansson <olof@lixom.net>
      a132bb90
  4. 08 9月, 2018 15 次提交
  5. 07 9月, 2018 9 次提交