1. 20 Sep, 2018 1 commit
    • Alexey Kardashevskiy's avatar
      powerpc/powernv/ioda2: Reduce upper limit for DMA window size (again) · 7233b8ca
      Alexey Kardashevskiy authored
      mpe: This was fixed originally in commit d3d4ffaa
      ("powerpc/powernv/ioda2: Reduce upper limit for DMA window size"), but
      contrary to what the merge commit says was inadvertently lost by me in
      commit ce57c661 ("Merge branch 'topic/ppc-kvm' into next") which
      brought in changes that moved the code to a new file. So reapply it to
      the new file.
      
      Original commit message follows:
      
      We use PHB in mode1 which uses bit 59 to select a correct DMA window.
      However there is mode2 which uses bits 59:55 and allows up to 32 DMA
      windows per a PE.
      
      Even though documentation does not clearly specify that, it seems that
      the actual hardware does not support bits 59:55 even in mode1, in
      other words we can create a window as big as 1<<58 but DMA simply
      won't work.
      
      This reduces the upper limit from 59 to 55 bits to let the userspace
      know about the hardware limits.
      
      Fixes: ce57c661 ("Merge branch 'topic/ppc-kvm' into next")
      Signed-off-by: default avatarAlexey Kardashevskiy <aik@ozlabs.ru>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      7233b8ca
  2. 18 Sep, 2018 1 commit
    • Michael Neuling's avatar
      powerpc: Avoid code patching freed init sections · 51c3c62b
      Michael Neuling authored
      This stops us from doing code patching in init sections after they've
      been freed.
      
      In this chain:
        kvm_guest_init() ->
          kvm_use_magic_page() ->
            fault_in_pages_readable() ->
      	 __get_user() ->
      	   __get_user_nocheck() ->
      	     barrier_nospec();
      
      We have a code patching location at barrier_nospec() and
      kvm_guest_init() is an init function. This whole chain gets inlined,
      so when we free the init section (hence kvm_guest_init()), this code
      goes away and hence should no longer be patched.
      
      We seen this as userspace memory corruption when using a memory
      checker while doing partition migration testing on powervm (this
      starts the code patching post migration via
      /sys/kernel/mobility/migration). In theory, it could also happen when
      using /sys/kernel/debug/powerpc/barrier_nospec.
      
      Cc: stable@vger.kernel.org # 4.13+
      Signed-off-by: default avatarMichael Neuling <mikey@neuling.org>
      Reviewed-by: default avatarNicholas Piggin <npiggin@gmail.com>
      Reviewed-by: default avatarChristophe Leroy <christophe.leroy@c-s.fr>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      51c3c62b
  3. 17 Sep, 2018 1 commit
  4. 10 Sep, 2018 1 commit
  5. 09 Sep, 2018 7 commits
  6. 08 Sep, 2018 6 commits
    • Linus Torvalds's avatar
      Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm · f8f65382
      Linus Torvalds authored
      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
    • Linus Torvalds's avatar
      Merge tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc · 0f3aa48a
      Linus Torvalds authored
      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
    • Olof Johansson's avatar
      Merge tag 'sunxi-fixes-for-4.19' of... · a132bb90
      Olof Johansson authored
      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: default avatarOlof Johansson <olof@lixom.net>
      a132bb90
    • Nadav Amit's avatar
      x86/mm: Use WRITE_ONCE() when setting PTEs · 9bc4f28a
      Nadav Amit authored
      When page-table entries are set, the compiler might optimize their
      assignment by using multiple instructions to set the PTE. This might
      turn into a security hazard if the user somehow manages to use the
      interim PTE. L1TF does not make our lives easier, making even an interim
      non-present PTE a security hazard.
      
      Using WRITE_ONCE() to set PTEs and friends should prevent this potential
      security hazard.
      
      I skimmed the differences in the binary with and without this patch. The
      differences are (obviously) greater when CONFIG_PARAVIRT=n as more
      code optimizations are possible. For better and worse, the impact on the
      binary with this patch is pretty small. Skimming the code did not cause
      anything to jump out as a security hazard, but it seems that at least
      move_soft_dirty_pte() caused set_pte_at() to use multiple writes.
      Signed-off-by: default avatarNadav Amit <namit@vmware.com>
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Andi Kleen <ak@linux.intel.com>
      Cc: Josh Poimboeuf <jpoimboe@redhat.com>
      Cc: Michal Hocko <mhocko@suse.com>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: Sean Christopherson <sean.j.christopherson@intel.com>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: stable@vger.kernel.org
      Link: https://lkml.kernel.org/r/20180902181451.80520-1-namit@vmware.com
      9bc4f28a
    • Thomas Gleixner's avatar
      x86/apic/vector: Make error return value negative · 47b7360c
      Thomas Gleixner authored
      activate_managed() returns EINVAL instead of -EINVAL in case of
      error. While this is unlikely to happen, the positive return value would
      cause further malfunction at the call site.
      
      Fixes: 2db1f959 ("x86/vector: Handle managed interrupts proper")
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Cc: stable@vger.kernel.org
      47b7360c
    • Linus Torvalds's avatar
      Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux · d7b686eb
      Linus Torvalds authored
      Pull i2c fixes from Wolfram Sang:
      
       - bugfixes for uniphier, i801, and xiic drivers
      
       - ID removal (never produced) for imx
      
       - one MAINTAINER addition
      
      * 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
        i2c: xiic: Record xilinx i2c with Zynq fragment
        i2c: xiic: Make the start and the byte count write atomic
        i2c: i801: fix DNV's SMBCTRL register offset
        i2c: imx-lpi2c: Remove mx8dv compatible entry
        dt-bindings: imx-lpi2c: Remove mx8dv compatible entry
        i2c: uniphier-f: issue STOP only for last message or I2C_M_STOP
        i2c: uniphier: issue STOP only for last message or I2C_M_STOP
      d7b686eb
  7. 07 Sep, 2018 21 commits
  8. 06 Sep, 2018 2 commits