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91648ec09c
linux/arch/powerpc/kvm
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pingfan liu 91648ec09c powerpc: kvm: fix rare but potential deadlock scene 
Since kvmppc_hv_find_lock_hpte() is called from both virtmode and
realmode, so it can trigger the deadlock.

Suppose the following scene:

Two physical cpuM, cpuN, two VM instances A, B, each VM has a group of
vcpus.

If on cpuM, vcpu_A_1 holds bitlock X (HPTE_V_HVLOCK), then is switched
out, and on cpuN, vcpu_A_2 try to lock X in realmode, then cpuN will be
caught in realmode for a long time.

What makes things even worse if the following happens,
  On cpuM, bitlockX is hold, on cpuN, Y is hold.
  vcpu_B_2 try to lock Y on cpuM in realmode
  vcpu_A_2 try to lock X on cpuN in realmode

Oops! deadlock happens

Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com>
Reviewed-by: Paul Mackerras <paulus@samba.org>
CC: stable@vger.kernel.org
Signed-off-by: Alexander Graf <agraf@suse.de>
2013-11-18 22:41:57 +01:00
..
44x_emulate.c kvm: powerpc: Add kvmppc_ops callback 2013-10-17 15:24:26 +02:00
44x_tlb.c kvm: powerpc: Add kvmppc_ops callback 2013-10-17 15:24:26 +02:00
44x_tlb.h KVM: ppc: rename 44x MMU functions used in booke.c 2009-03-24 11:02:56 +02:00
44x.c kvm: powerpc: book3s: Allow the HV and PR selection per virtual machine 2013-10-17 18:42:36 +02:00
book3s_32_mmu_host.c kvm: powerpc: Add kvmppc_ops callback 2013-10-17 15:24:26 +02:00
book3s_32_mmu.c KVM: PPC: Book3S PR: Better handling of host-side read-only pages 2013-10-17 14:49:35 +02:00
book3s_32_sr.S KVM: PPC: book3s_pr: Simplify transitions between virtual and real mode 2011-09-25 19:52:29 +03:00
book3s_64_mmu_host.c kvm: powerpc: book3s: pr: move PR related tracepoints to a separate header 2013-10-17 15:36:22 +02:00
book3s_64_mmu_hv.c powerpc: kvm: fix rare but potential deadlock scene 2013-11-18 22:41:57 +01:00
book3s_64_mmu.c KVM: PPC: Book3S PR: Better handling of host-side read-only pages 2013-10-17 14:49:35 +02:00
book3s_64_slb.S powerpc: Fix little endian lppaca, slb_shadow and dtl_entry 2013-08-14 15:33:35 +10:00
book3s_64_vio_hv.c kvm: powerpc: book3s: move book3s_64_vio_hv.c into the main kernel binary 2013-10-17 15:17:25 +02:00
book3s_64_vio.c ppc: kvm: use anon_inode_getfd() with O_CLOEXEC flag 2013-08-26 13:19:56 +03:00
book3s_emulate.c kvm: powerpc: book3s: Support building HV and PR KVM as module 2013-10-17 15:45:35 +02:00
book3s_exports.c kvm: powerpc: book3s: Add a new config variable CONFIG_KVM_BOOK3S_HV_POSSIBLE 2013-10-17 15:18:28 +02:00
book3s_hv_builtin.c powerpc/kvm: Contiguous memory allocator based RMA allocation 2013-07-08 16:20:20 +02:00
book3s_hv_cma.c powerpc/kvm: Use 256K chunk to track both RMA and hash page table allocation. 2013-07-08 16:21:13 +02:00
book3s_hv_cma.h powerpc/kvm: Use 256K chunk to track both RMA and hash page table allocation. 2013-07-08 16:21:13 +02:00
book3s_hv_interrupts.S kvm: powerpc: book3s: remove kvmppc_handler_highmem label 2013-10-17 15:15:56 +02:00
book3s_hv_ras.c KVM: PPC: Book3S HV: Fix compilation without CONFIG_PPC_POWERNV 2013-01-06 14:02:00 +01:00
book3s_hv_rm_mmu.c powerpc: kvm: fix rare but potential deadlock scene 2013-11-18 22:41:57 +01:00
book3s_hv_rm_xics.c KVM: PPC: Book3S HV: Add support for real mode ICP in XICS emulation 2013-04-26 20:27:32 +02:00
book3s_hv_rmhandlers.S KVM: PPC: Book3S HV: Refine barriers in guest entry/exit 2013-11-18 22:38:30 +01:00
book3s_hv.c KVM: PPC: Book3S HV: Take SRCU read lock around kvm_read_guest() call 2013-11-18 22:41:20 +01:00
book3s_interrupts.S kvm: powerpc: Add kvmppc_ops callback 2013-10-17 15:24:26 +02:00
book3s_mmu_hpte.c kvm: powerpc: book3s: pr: move PR related tracepoints to a separate header 2013-10-17 15:36:22 +02:00
book3s_paired_singles.c powerpc/kvm: Fallout from system.h disintegration 2012-04-02 14:00:04 +10:00
book3s_pr_papr.c KVM: PPC: Book3S PR: Make HPT accesses and updates SMP-safe 2013-10-17 14:45:04 +02:00
book3s_pr.c Here are the 3.13 KVM changes. There was a lot of work on the PPC 2013-11-15 13:51:36 +09:00
book3s_rmhandlers.S KVM: PPC: Book3S: Move skip-interrupt handlers to common code 2013-10-17 14:49:35 +02:00
book3s_rtas.c kvm: powerpc: book3s: Support building HV and PR KVM as module 2013-10-17 15:45:35 +02:00
book3s_segment.S kvm: powerpc: book3s: Cleanup interrupt handling code 2013-10-17 15:26:31 +02:00
book3s_xics.c kvm: powerpc: book3s: drop is_hv_enabled 2013-10-17 18:43:34 +02:00
book3s_xics.h KVM: PPC: Book3S: Add API for in-kernel XICS emulation 2013-05-02 15:28:36 +02:00
book3s.c kvm: powerpc: book3s: drop is_hv_enabled 2013-10-17 18:43:34 +02:00
book3s.h kvm: powerpc: book3s: Allow the HV and PR selection per virtual machine 2013-10-17 18:42:36 +02:00
booke_emulate.c KVM: PPC: BookE: Emulate mfspr on EPR 2013-01-10 13:42:30 +01:00
booke_interrupts.S KVM: PPC: booke: Added debug handler 2013-03-22 01:21:09 +01:00
booke.c Here are the 3.13 KVM changes. There was a lot of work on the PPC 2013-11-15 13:51:36 +09:00
booke.h kvm: powerpc: Add kvmppc_ops callback 2013-10-17 15:24:26 +02:00
bookehv_interrupts.S KVM: PPC: bookehv64: Add support for interrupt handling 2012-12-06 01:34:11 +01:00
e500_emulate.c kvm: powerpc: Add kvmppc_ops callback 2013-10-17 15:24:26 +02:00
e500_mmu_host.c Merge branch 'kvm-ppc-queue' of git://github.com/agraf/linux-2.6 into queue 2013-11-04 10:20:57 +02:00
e500_mmu_host.h KVM: PPC: E500: Make clear_tlb_refs and clear_tlb1_bitmap static 2013-01-24 19:23:33 +01:00
e500_mmu.c kvm: powerpc: booke: Move booke related tracepoints to separate header 2013-10-17 15:37:16 +02:00
e500.c kvm: powerpc: book3s: Allow the HV and PR selection per virtual machine 2013-10-17 18:42:36 +02:00
e500.h kvm: powerpc: allow guest control "G" attribute in mas2 2013-10-17 14:49:37 +02:00
e500mc.c kvm: powerpc: book3s: Allow the HV and PR selection per virtual machine 2013-10-17 18:42:36 +02:00
emulate.c kvm: powerpc: book3s: Allow the HV and PR selection per virtual machine 2013-10-17 18:42:36 +02:00
fpu.S powerpc: Remove fpscr use from [kvm_]cvt_{fd,df} 2010-09-02 14:07:32 +10:00
irq.h KVM: PPC: Book3S: Add API for in-kernel XICS emulation 2013-05-02 15:28:36 +02:00
Kconfig Here are the 3.13 KVM changes. There was a lot of work on the PPC 2013-11-15 13:51:36 +09:00
Makefile kvm: powerpc: book3s: Support building HV and PR KVM as module 2013-10-17 15:45:35 +02:00
mpic.c kvm/ppc/mpic: fix missing unlock in set_base_addr() 2013-05-02 15:28:35 +02:00
powerpc.c kvm: powerpc: book3s: drop is_hv_enabled 2013-10-17 18:43:34 +02:00
timing.c KVM: PPC: fix partial application of "exit timing in ticks" 2011-07-12 13:16:28 +03:00
timing.h KVM: PPC: booke: category E.HV (GS-mode) support 2012-04-08 12:51:19 +03:00
trace_booke.h kvm: powerpc: booke: Move booke related tracepoints to separate header 2013-10-17 15:37:16 +02:00
trace_pr.h kvm: powerpc: book3s: pr: move PR related tracepoints to a separate header 2013-10-17 15:36:22 +02:00
trace.h kvm: powerpc: booke: Move booke related tracepoints to separate header 2013-10-17 15:37:16 +02:00