1. 28 Mar, 2017 1 commit
  2. 23 Mar, 2017 7 commits
    • David Hildenbrand's avatar
      KVM: kvm_io_bus_unregister_dev() should never fail · 90db1043
      David Hildenbrand authored
      No caller currently checks the return value of
      kvm_io_bus_unregister_dev(). This is evil, as all callers silently go on
      freeing their device. A stale reference will remain in the io_bus,
      getting at least used again, when the iobus gets teared down on
      kvm_destroy_vm() - leading to use after free errors.
      
      There is nothing the callers could do, except retrying over and over
      again.
      
      So let's simply remove the bus altogether, print an error and make
      sure no one can access this broken bus again (returning -ENOMEM on any
      attempt to access it).
      
      Fixes: e93f8a0f
      
       ("KVM: convert io_bus to SRCU")
      Cc: stable@vger.kernel.org # 3.4+
      Reported-by: default avatarDmitry Vyukov <dvyukov@google.com>
      Reviewed-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
      Signed-off-by: default avatarDavid Hildenbrand <david@redhat.com>
      Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      90db1043
    • Wanpeng Li's avatar
      KVM: VMX: Fix enable VPID conditions · 08d839c4
      Wanpeng Li authored
      
      
      This can be reproduced by running L2 on L1, and disable VPID on L0
      if w/o commit "KVM: nVMX: Fix nested VPID vmx exec control", the L2
      crash as below:
      
      KVM: entry failed, hardware error 0x7
      EAX=00000000 EBX=00000000 ECX=00000000 EDX=000306c3
      ESI=00000000 EDI=00000000 EBP=00000000 ESP=00000000
      EIP=0000fff0 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
      ES =0000 00000000 0000ffff 00009300
      CS =f000 ffff0000 0000ffff 00009b00
      SS =0000 00000000 0000ffff 00009300
      DS =0000 00000000 0000ffff 00009300
      FS =0000 00000000 0000ffff 00009300
      GS =0000 00000000 0000ffff 00009300
      LDT=0000 00000000 0000ffff 00008200
      TR =0000 00000000 0000ffff 00008b00
      GDT=     00000000 0000ffff
      IDT=     00000000 0000ffff
      CR0=60000010 CR2=00000000 CR3=00000000 CR4=00000000
      DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000
      DR6=00000000ffff0ff0 DR7=0000000000000400
      EFER=0000000000000000
      
      Reference SDM 30.3 INVVPID:
      
      Protected Mode Exceptions
      - #UD
        - If not in VMX operation.
        - If the logical processor does not support VPIDs (IA32_VMX_PROCBASED_CTLS2[37]=0).
        - If the logical processor supports VPIDs (IA32_VMX_PROCBASED_CTLS2[37]=1) but does
          not support the INVVPID instruction (IA32_VMX_EPT_VPID_CAP[32]=0).
      
      So we should check both VPID enable bit in vmx exec control and INVVPID support bit
      in vmx capability MSRs to enable VPID. This patch adds the guarantee to not enable
      VPID if either INVVPID or single-context/all-context invalidation is not exposed in
      vmx capability MSRs.
      Reviewed-by: default avatarDavid Hildenbrand <david@redhat.com>
      Reviewed-by: default avatarJim Mattson <jmattson@google.com>
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Signed-off-by: default avatarWanpeng Li <wanpeng.li@hotmail.com>
      Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      08d839c4
    • Wanpeng Li's avatar
      KVM: nVMX: Fix nested VPID vmx exec control · 63cb6d5f
      Wanpeng Li authored
      This can be reproduced by running kvm-unit-tests/vmx.flat on L0 w/ vpid disabled.
      
      Test suite: VPID
      Unhandled exception 6 #UD at ip 00000000004051a6
      error_code=0000      rflags=00010047      cs=00000008
      rax=0000000000000000 rcx=0000000000000001 rdx=0000000000000047 rbx=0000000000402f79
      rbp=0000000000456240 rsi=0000000000000001 rdi=0000000000000000
      r8=000000000000000a  r9=00000000000003f8 r10=0000000080010011 r11=0000000000000000
      r12=0000000000000003 r13=0000000000000708 r14=0000000000000000 r15=0000000000000000
      cr0=0000000080010031 cr2=0000000000000000 cr3=0000000007fff000 cr4=0000000000002020
      cr8=0000000000000000
      STACK: @4051a6 40523e 400f7f 402059 40028f
      
      We should hide and forbid VPID in L1 if it is disabled on L0. However, nested VPID
      enable bit is set unconditionally during setup nested vmx exec controls though VPID
      is not exposed through nested VMX capablity. This patch fixes it by don't set nested
      VPID enable bit if it is disabled on L0.
      
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Cc: stable@vger.kernel.org
      Fixes: 5c614b35
      
       (KVM: nVMX: nested VPID emulation)
      Signed-off-by: default avatarWanpeng Li <wanpeng.li@hotmail.com>
      Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      63cb6d5f
    • Wanpeng Li's avatar
      KVM: x86: correct async page present tracepoint · 24dccf83
      Wanpeng Li authored
      
      
      After async pf setup successfully, there is a broadcast wakeup w/ special
      token 0xffffffff which tells vCPU that it should wake up all processes
      waiting for APFs though there is no real process waiting at the moment.
      
      The async page present tracepoint print prematurely and fails to catch the
      special token setup. This patch fixes it by moving the async page present
      tracepoint after the special token setup.
      
      Before patch:
      
      qemu-system-x86-8499  [006] ...1  5973.473292: kvm_async_pf_ready: token 0x0 gva 0x0
      
      After patch:
      
      qemu-system-x86-8499  [006] ...1  5973.473292: kvm_async_pf_ready: token 0xffffffff gva 0x0
      
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Signed-off-by: default avatarWanpeng Li <wanpeng.li@hotmail.com>
      Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      24dccf83
    • Jim Mattson's avatar
      kvm: vmx: Flush TLB when the APIC-access address changes · fb6c8198
      Jim Mattson authored
      
      
      Quoting from the Intel SDM, volume 3, section 28.3.3.4: Guidelines for
      Use of the INVEPT Instruction:
      
      If EPT was in use on a logical processor at one time with EPTP X, it
      is recommended that software use the INVEPT instruction with the
      "single-context" INVEPT type and with EPTP X in the INVEPT descriptor
      before a VM entry on the same logical processor that enables EPT with
      EPTP X and either (a) the "virtualize APIC accesses" VM-execution
      control was changed from 0 to 1; or (b) the value of the APIC-access
      address was changed.
      
      In the nested case, the burden falls on L1, unless L0 enables EPT in
      vmcs02 when L1 doesn't enable EPT in vmcs12.
      Signed-off-by: default avatarJim Mattson <jmattson@google.com>
      Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
      fb6c8198
    • Peter Xu's avatar
      KVM: x86: use pic/ioapic destructor when destroy vm · c761159c
      Peter Xu authored
      
      
      We have specific destructors for pic/ioapic, we'd better use them when
      destroying the VM as well.
      Signed-off-by: default avatarPeter Xu <peterx@redhat.com>
      Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
      c761159c
    • Peter Xu's avatar
      KVM: x86: check existance before destroy · 950712eb
      Peter Xu authored
      
      
      Mostly used for split irqchip mode. In that case, these two things are
      not inited at all, so no need to release.
      Signed-off-by: default avatarPeter Xu <peterx@redhat.com>
      Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
      950712eb
  3. 21 Mar, 2017 1 commit
  4. 20 Mar, 2017 10 commits
    • Luiz Capitulino's avatar
    • Wanpeng Li's avatar
      KVM: nVMX: don't reset kvm mmu twice · 6d1b3ad2
      Wanpeng Li authored
      
      
      kvm mmu is reset once successfully loading CR3 as part of emulating vmentry
      in nested_vmx_load_cr3(). We should not reset kvm mmu twice.
      
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Signed-off-by: default avatarWanpeng Li <wanpeng.li@hotmail.com>
      Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
      6d1b3ad2
    • kbuild test robot's avatar
      PTP: fix ptr_ret.cocci warnings · 49e190ec
      kbuild test robot authored
      
      
      drivers/ptp/ptp_kvm.c:229:1-3: WARNING: PTR_ERR_OR_ZERO can be used
      
       Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR
      
      Generated by: scripts/coccinelle/api/ptr_ret.cocci
      
      CC: Marcelo Tosatti <mtosatti@redhat.com>
      Signed-off-by: default avatarFengguang Wu <fengguang.wu@intel.com>
      Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
      49e190ec
    • Dmitry Vyukov's avatar
      kvm: fix usage of uninit spinlock in avic_vm_destroy() · 3863dff0
      Dmitry Vyukov authored
      
      
      If avic is not enabled, avic_vm_init() does nothing and returns early.
      However, avic_vm_destroy() still tries to destroy what hasn't been created.
      The only bad consequence of this now is that avic_vm_destroy() uses
      svm_vm_data_hash_lock that hasn't been initialized (and is not meant
      to be used at all if avic is not enabled).
      
      Return early from avic_vm_destroy() if avic is not enabled.
      It has nothing to destroy.
      Signed-off-by: default avatarDmitry Vyukov <dvyukov@google.com>
      Cc: Joerg Roedel <joro@8bytes.org>
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Cc: "Radim Krčmář" <rkrcmar@redhat.com>
      Cc: David Hildenbrand <david@redhat.com>
      Cc: kvm@vger.kernel.org
      Cc: syzkaller@googlegroups.com
      Reviewed-by: default avatarDavid Hildenbrand <david@redhat.com>
      Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
      3863dff0
    • Radim Krčmář's avatar
      KVM: VMX: downgrade warning on unexpected exit code · 6c6c5e03
      Radim Krčmář authored
      
      
      We never needed the call trace and we better rate-limit if it can be
      triggered by a guest.
      Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
      6c6c5e03
    • Linus Torvalds's avatar
      Linux 4.11-rc3 · 97da3854
      Linus Torvalds authored
      97da3854
    • Linus Torvalds's avatar
      mm/swap: don't BUG_ON() due to uninitialized swap slot cache · 452b94b8
      Linus Torvalds authored
      
      
      This BUG_ON() triggered for me once at shutdown, and I don't see a
      reason for the check.  The code correctly checks whether the swap slot
      cache is usable or not, so an uninitialized swap slot cache is not
      actually problematic afaik.
      
      I've temporarily just switched the BUG_ON() to a WARN_ON_ONCE(), since
      I'm not sure why that seemingly pointless check was there.  I suspect
      the real fix is to just remove it entirely, but for now we'll warn about
      it but not bring the machine down.
      
      Cc: "Huang, Ying" <ying.huang@intel.com>
      Cc: Tim Chen <tim.c.chen@linux.intel.com>
      Cc: Michal Hocko <mhocko@suse.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      452b94b8
    • Linus Torvalds's avatar
      Merge tag 'powerpc-4.11-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux · a07a6e41
      Linus Torvalds authored
      Pull more powerpc fixes from Michael Ellerman:
       "A couple of minor powerpc fixes for 4.11:
      
         - wire up statx() syscall
      
         - don't print a warning on memory hotplug when HPT resizing isn't
           available
      
        Thanks to: David Gibson, Chandan Rajendra"
      
      * tag 'powerpc-4.11-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
        powerpc/pseries: Don't give a warning when HPT resizing isn't available
        powerpc: Wire up statx() syscall
      a07a6e41
    • Linus Torvalds's avatar
      Merge branch 'parisc-4.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux · 4571bc5a
      Linus Torvalds authored
      Pull parisc fixes from Helge Deller:
      
       - Mikulas Patocka added support for R_PARISC_SECREL32 relocations in
         modules with CONFIG_MODVERSIONS.
      
       - Dave Anglin optimized the cache flushing for vmap ranges.
      
       - Arvind Yadav provided a fix for a potential NULL pointer dereference
         in the parisc perf code (and some code cleanups).
      
       - I wired up the new statx system call, fixed some compiler warnings
         with the access_ok() macro and fixed shutdown code to really halt a
         system at shutdown instead of crashing & rebooting.
      
      * 'parisc-4.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
        parisc: Fix system shutdown halt
        parisc: perf: Fix potential NULL pointer dereference
        parisc: Avoid compiler warnings with access_ok()
        parisc: Wire up statx system call
        parisc: Optimize flush_kernel_vmap_range and invalidate_kernel_vmap_range
        parisc: support R_PARISC_SECREL32 relocation in modules
      4571bc5a
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending · 8aa34172
      Linus Torvalds authored
      Pull SCSI target fixes from Nicholas Bellinger:
       "The bulk of the changes are in qla2xxx target driver code to address
        various issues found during Cavium/QLogic's internal testing (stable
        CC's included), along with a few other stability and smaller
        miscellaneous improvements.
      
        There are also a couple of different patch sets from Mike Christie,
        which have been a result of his work to use target-core ALUA logic
        together with tcm-user backend driver.
      
        Finally, a patch to address some long standing issues with
        pass-through SCSI export of TYPE_TAPE + TYPE_MEDIUM_CHANGER devices,
        which will make folks using physical (or virtual) magnetic tape happy"
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (28 commits)
        qla2xxx: Update driver version to 9.00.00.00-k
        qla2xxx: Fix delayed response to command for loop mode/direct connect.
        qla2xxx: Change scsi host lookup method.
        qla2xxx: Add DebugFS node to display Port Database
        qla2xxx: Use IOCB interface to submit non-critical MBX.
        qla2xxx: Add async new target notification
        qla2xxx: Export DIF stats via debugfs
        qla2xxx: Improve T10-DIF/PI handling in driver.
        qla2xxx: Allow relogin to proceed if remote login did not finish
        qla2xxx: Fix sess_lock & hardware_lock lock order problem.
        qla2xxx: Fix inadequate lock protection for ABTS.
        qla2xxx: Fix request queue corruption.
        qla2xxx: Fix memory leak for abts processing
        qla2xxx: Allow vref count to timeout on vport delete.
        tcmu: Convert cmd_time_out into backend device attribute
        tcmu: make cmd timeout configurable
        tcmu: add helper to check if dev was configured
        target: fix race during implicit transition work flushes
        target: allow userspace to set state to transitioning
        target: fix ALUA transition timeout handling
        ...
      8aa34172
  5. 19 Mar, 2017 15 commits
  6. 18 Mar, 2017 6 commits
    • Nicholas Bellinger's avatar
      tcmu: Convert cmd_time_out into backend device attribute · 7d7a7435
      Nicholas Bellinger authored
      
      
      Instead of putting cmd_time_out under ../target/core/user_0/foo/control,
      which has historically been used by parameters needed for initial
      backend device configuration, go ahead and move cmd_time_out into
      a backend device attribute.
      
      In order to do this, tcmu_module_init() has been updated to create
      a local struct configfs_attribute **tcmu_attrs, that is based upon
      the existing passthrough_attrib_attrs along with the new cmd_time_out
      attribute.  Once **tcm_attrs has been setup, go ahead and point
      it at tcmu_ops->tb_dev_attrib_attrs so it's picked up by target-core.
      
      Also following MNC's previous change, ->cmd_time_out is stored in
      milliseconds but exposed via configfs in seconds.  Also, note this
      patch restricts the modification of ->cmd_time_out to before +
      after the TCMU device has been configured, but not while it has
      active fabric exports.
      
      Cc: Mike Christie <mchristi@redhat.com>
      Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
      7d7a7435
    • Mike Christie's avatar
      tcmu: make cmd timeout configurable · af980e46
      Mike Christie authored
      
      
      A single daemon could implement multiple types of devices
      using multuple types of real devices that may not support
      restarting from crashes and/or handling tcmu timeouts. This
      makes the cmd timeout configurable, so handlers that do not
      support it can turn if off for now.
      Signed-off-by: default avatarMike Christie <mchristi@redhat.com>
      Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
      af980e46
    • Mike Christie's avatar
      tcmu: add helper to check if dev was configured · 972c7f16
      Mike Christie authored
      
      
      This adds a helper to check if the dev was configured. It
      will be used in the next patch to prevent updates to some
      config settings after the device has been setup.
      Signed-off-by: default avatarMike Christie <mchristi@redhat.com>
      Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
      972c7f16
    • Linus Torvalds's avatar
      Merge tag 'openrisc-for-linus' of git://github.com/openrisc/linux · 93afaa45
      Linus Torvalds authored
      Pull OpenRISC fixes from Stafford Horne:
       "OpenRISC fixes for build issues that were exposed by kbuild robots
        after 4.11 merge. All from allmodconfig builds. This includes:
      
         - bug in the handling of 8-byte get_user() calls
      
         - module build failure due to multile missing symbol exports"
      
      * tag 'openrisc-for-linus' of git://github.com/openrisc/linux:
        openrisc: Export symbols needed by modules
        openrisc: fix issue handling 8 byte get_user calls
        openrisc: xchg: fix `computed is not used` warning
      93afaa45
    • Mike Christie's avatar
      target: fix race during implicit transition work flushes · 760bf578
      Mike Christie authored
      
      
      This fixes the following races:
      
      1. core_alua_do_transition_tg_pt could have read
      tg_pt_gp_alua_access_state and gone into this if chunk:
      
      if (!explicit &&
              atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) ==
                 ALUA_ACCESS_STATE_TRANSITION) {
      
      and then core_alua_do_transition_tg_pt_work could update the
      state. core_alua_do_transition_tg_pt would then only set
      tg_pt_gp_alua_pending_state and the tg_pt_gp_alua_access_state would
      not get updated with the second calls state.
      
      2. core_alua_do_transition_tg_pt could be setting
      tg_pt_gp_transition_complete while the tg_pt_gp_transition_work
      is already completing. core_alua_do_transition_tg_pt then waits on the
      completion that will never be called.
      
      To handle these issues, we just call flush_work which will return when
      core_alua_do_transition_tg_pt_work has completed so there is no need
      to do the complete/wait. And, if core_alua_do_transition_tg_pt_work
      was running, instead of trying to sneak in the state change, we just
      schedule up another core_alua_do_transition_tg_pt_work call.
      
      Note that this does not handle a possible race where there are multiple
      threads call core_alua_do_transition_tg_pt at the same time. I think
      we need a mutex in target_tg_pt_gp_alua_access_state_store.
      Signed-off-by: default avatarMike Christie <mchristi@redhat.com>
      Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
      760bf578
    • Mike Christie's avatar
      target: allow userspace to set state to transitioning · 1ca4d4fa
      Mike Christie authored
      
      
      Userspace target_core_user handlers like tcmu-runner may want to set the
      ALUA state to transitioning while it does implicit transitions. This
      patch allows that state when set from configfs.
      Signed-off-by: default avatarMike Christie <mchristi@redhat.com>
      Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
      1ca4d4fa