Paul Mackerras 129e4323df KVM: PPC: Book3S HV: Don't lose hardware R/C bit updates in H_PROTECT ... commit f064a0de1579fabded8990bed93971e30deb9ecb upstream. The hashed page table MMU in POWER processors can update the R (reference) and C (change) bits in a HPTE at any time until the HPTE has been invalidated and the TLB invalidation sequence has completed. In kvmppc_h_protect, which implements the H_PROTECT hypercall, we read the HPTE, modify the second doubleword, invalidate the HPTE in memory, do the TLB invalidation sequence, and then write the modified value of the second doubleword back to memory. In doing so we could overwrite an R/C bit update done by hardware between when we read the HPTE and when the TLB invalidation completed. To fix this we re-read the second doubleword after the TLB invalidation and OR in the (possibly) new values of R and C. We can use an OR since hardware only ever sets R and C, never clears them. This race was found by code inspection. In principle this bug could cause occasional guest memory corruption under host memory pressure. Fixes: a8606e20e4 ("KVM: PPC: Handle some PAPR hcalls in the kernel", 2011-06-29) Signed-off-by: Paul Mackerras <paulus@ozlabs.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2017-01-09 08:07:50 +01:00
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book3s.c	KVM: PPC: Book3S: Take the kvm->srcu lock in kvmppc_h_logical_ci_load/store()	2015-09-21 09:05:15 +10:00
book3s.h	kvm: Fix page ageing bugs	2014-09-24 14:07:58 +02:00
book3s_32_mmu.c	arch: powerpc: kvm: book3s_32_mmu.c: Remove unused function	2014-12-17 13:12:25 +01:00
book3s_32_mmu_host.c	KVM: PPC: Fix warnings from sparse	2015-08-22 11:16:16 +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.c	KVM: PPC: Disable NX for old magic page using guests	2014-05-30 14:26:24 +02:00
book3s_64_mmu_host.c	KVM: PPC: Fix warnings from sparse	2015-08-22 11:16:16 +02:00
book3s_64_mmu_hv.c	powerpc updates for 4.4	2015-11-05 23:38:43 -08:00
book3s_64_slb.S	KVM: PPC: Book3S PR: Rework SLB switching code	2014-05-30 14:26:30 +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_64_vio_hv.c	KVM: PPC: Book3S: Introduce hypervisor call H_GET_TCE	2014-03-26 23:34:27 +11:00
book3s_emulate.c	KVM: PPC: Book3s PR: Allow access to unprivileged MMCR2 register	2016-10-16 17:36:14 +02:00
book3s_exports.c	KVM: PPC: Make shared struct aka magic page guest endian	2014-05-30 14:26:21 +02:00
book3s_hv.c	KVM: PPC: Book3S HV: Save/restore XER in checkpointed register state	2017-01-09 08:07:49 +01:00
book3s_hv_builtin.c	KVM: PPC: Book3S HV: Implement dynamic micro-threading on POWER8	2015-08-22 11:16:17 +02:00
book3s_hv_interrupts.S	powerpc/kvm: Create proper names for the kvm_host_state PMU fields	2014-12-29 15:45:55 +11:00
book3s_hv_ras.c	powerpc/book3s: Fix flush_tlb cpu_spec hook to take a generic argument.	2015-03-17 07:52:48 +11:00
book3s_hv_rm_mmu.c	KVM: PPC: Book3S HV: Don't lose hardware R/C bit updates in H_PROTECT	2017-01-09 08:07:50 +01:00
book3s_hv_rm_xics.c	KVM: PPC: Book3S HV: Make use of unused threads when running guests	2015-08-22 11:16:17 +02:00
book3s_hv_rmhandlers.S	KVM: PPC: Book3S HV: Save/restore XER in checkpointed register state	2017-01-09 08:07:49 +01:00
book3s_interrupts.S	KVM: PPC: Book3S PR: Fix ABIv2 on LE	2014-07-28 15:22:15 +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	KVM: PPC: Fix warnings from sparse	2015-08-22 11:16:16 +02:00
book3s_pr.c	KVM: add "new" argument to kvm_arch_commit_memory_region	2015-05-28 10:42:58 +02:00
book3s_pr_papr.c	kvmppc: Implement H_LOGICAL_CI_{LOAD,STORE} in KVM	2015-04-21 15:21:28 +02:00
book3s_rmhandlers.S	KVM: PPC: Book3S PR: Fix ABIv2 on LE	2014-07-28 15:22:15 +02:00
book3s_rtas.c	KVM: PPC: RTAS: Do byte swaps explicitly	2014-07-07 23:17:20 +02:00
book3s_segment.S	KVM: PPC: Book3S: correct width in XER handling	2015-08-22 11:16:19 +02:00
book3s_xics.c	KVM: PPC: Book3S: Fix typo in top comment about locking	2015-09-04 07:28:05 +10:00
book3s_xics.h	KVM: PPC: Book3S HV: Add ICP real mode counters	2015-04-21 15:21:30 +02:00
booke.c	KVM: PPC: BookE: Fix a sanity check	2016-10-16 17:36:15 +02:00
booke.h	KVM: PPC: Book3e: Add AltiVec support	2014-09-22 10:11:32 +02:00
booke_emulate.c	KVM: PPC: BOOKE: Emulate debug registers and exception	2014-09-22 10:11:33 +02:00
booke_interrupts.S	KVM: PPC: Remove 440 support	2014-07-28 15:23:15 +02:00
bookehv_interrupts.S	powerpc/kvm: common sw breakpoint instr across ppc	2014-09-22 10:11:36 +02:00
e500.c	KVM: PPC: e500: fix handling local_sid_lookup result	2015-10-15 15:58:16 +11:00
e500.h	KVM: PPC: e500mc: Add support for single threaded vcpus on e6500 core	2014-09-22 10:11:35 +02:00
e500_emulate.c	KVM: PPC: e500: Emulate TMCFG0 TMRN register	2015-10-15 15:58:16 +11:00
e500_mmu.c	KVM: PPC: fix suspicious use of conditional operator	2015-08-22 11:16:16 +02:00
e500_mmu_host.c	powerpc updates for 4.4	2015-11-05 23:38:43 -08:00
e500_mmu_host.h	KVM: PPC: E500: Make clear_tlb_refs and clear_tlb1_bitmap static	2013-01-24 19:23:33 +01:00
e500mc.c	powerpc: Replace __get_cpu_var uses	2014-11-03 12:12:32 +11:00
emulate.c	KVM: PPC: Pass enum to kvmppc_get_last_inst	2014-09-22 10:11:36 +02:00
emulate_loadstore.c	KVM: PPC: Pass enum to kvmppc_get_last_inst	2014-09-22 10:11:36 +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	KVM: PPC: Remove PPC970 from KVM_BOOK3S_64_HV text in Kconfig	2015-08-22 11:16:16 +02:00
Makefile	Here are the PPC and ARM changes for KVM, which I separated because	2014-08-07 11:35:30 -07:00
mpic.c	kvm/ppc/mpic: drop unused IRQ_testbit	2015-04-08 10:46:58 +02:00
powerpc.c	KVM: PPC: Fix ONE_REG AltiVec support	2016-02-25 12:01:20 -08:00
timing.c	KVM: PPC: Remove DCR handling	2014-07-28 19:29:15 +02:00
timing.h	KVM: PPC: Remove DCR handling	2014-07-28 19:29:15 +02:00
trace.h	kvm: powerpc: booke: Move booke related tracepoints to separate header	2013-10-17 15:37:16 +02:00
trace_book3s.h	KVM: PPC: Book3S HV: Tracepoints for KVM HV guest interactions	2014-12-17 13:29:27 +01:00
trace_booke.h	KVM: PPC: BookE: Improve irq inject tracepoint	2014-12-15 13:27:23 +01:00
trace_hv.h	KVM: PPC: Book3S HV: Tracepoints for KVM HV guest interactions	2014-12-17 13:29:27 +01:00
trace_pr.h	KVM: PPC: Book3S HV: Tracepoints for KVM HV guest interactions	2014-12-17 13:29:27 +01:00