Paul Mackerras f064a0de15 KVM: PPC: Book3S HV: Don't lose hardware R/C bit updates in H_PROTECT ... 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) Cc: stable@vger.kernel.org # v3.19+ Signed-off-by: Paul Mackerras <paulus@ozlabs.org>		2016-11-21 15:29:20 +11:00
..
book3s_32_mmu_host.c	powerpc/mm: Move hash related mmu-*.h headers to book3s/	2016-03-03 21:19:21 +11:00
book3s_32_mmu.c	arch: powerpc: kvm: book3s_32_mmu.c: Remove unused function	2014-12-17 13:12:25 +01:00
book3s_32_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	powerpc/mm: Move hash table ops to a separate structure	2016-07-21 18:59:09 +10:00
book3s_64_mmu_hv.c	KVM: PPC: Book3S HV: Add a per vcpu cache for recently page faulted MMIO entries	2016-11-21 15:17:55 +11:00
book3s_64_mmu.c	powerpc/mm: Move hash related mmu-*.h headers to book3s/	2016-03-03 21:19:21 +11:00
book3s_64_slb.S	KVM: PPC: Book3S PR: Rework SLB switching code	2014-05-30 14:26:30 +02:00
book3s_64_vio_hv.c	KVM: PPC: Book3S HV: sparse: prototypes for functions called from assembler	2016-11-21 15:17:54 +11:00
book3s_64_vio.c	powerpc/kvm: Clarify __user annotations	2016-07-14 20:43:50 +10:00
book3s_emulate.c	KVM: PPC: Book3s PR: Allow access to unprivileged MMCR2 register	2016-09-27 15:14:29 +10:00
book3s_exports.c	KVM: PPC: Make shared struct aka magic page guest endian	2014-05-30 14:26:21 +02:00
book3s_hv_builtin.c	KVM: PPC: Book3S HV: sparse: prototypes for functions called from assembler	2016-11-21 15:17:54 +11:00
book3s_hv_hmi.c	powerpc: move hmi.c to arch/powerpc/kvm/	2016-09-09 16:18:07 +10:00
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	KVM: PPC: Book3S HV: sparse: prototypes for functions called from assembler	2016-11-21 15:17:54 +11:00
book3s_hv_rm_mmu.c	KVM: PPC: Book3S HV: Don't lose hardware R/C bit updates in H_PROTECT	2016-11-21 15:29:20 +11:00
book3s_hv_rm_xics.c	KVM: PPC: Book3S HV: sparse: prototypes for functions called from assembler	2016-11-21 15:17:54 +11:00
book3s_hv_rmhandlers.S	KVM: PPC: Book3S HV: Save/restore XER in checkpointed register state	2016-11-21 15:17:55 +11:00
book3s_hv.c	KVM: PPC: Book3S HV: Save/restore XER in checkpointed register state	2016-11-21 15:17:55 +11:00
book3s_interrupts.S	powerpc: Define and use PPC64_ELF_ABI_v2/v1	2016-06-14 13:58:27 +10:00
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: Create disable_kernel_{fp,altivec,vsx,spe}()	2015-12-01 13:52:25 +11:00
book3s_pr_papr.c	KVM: PPC: Add support for multiple-TCE hcalls	2016-02-16 13:44:26 +11:00
book3s_pr.c	KVM: PPC: Book3S PR: Support 64kB page size on POWER8E and POWER8NVL	2016-09-27 15:14:29 +10:00
book3s_rmhandlers.S	powerpc: Define and use PPC64_ELF_ABI_v2/v1	2016-06-14 13:58:27 +10:00
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 HV: Set server for passed-through interrupts	2016-09-12 10:12:28 +10:00
book3s_xics.h	KVM: PPC: Book3S HV: Set server for passed-through interrupts	2016-09-12 10:12:28 +10:00
book3s.c	KVM: PPC: Book3S: Treat VTB as a per-subcore register, not per-thread	2016-09-27 14:41:39 +10:00
book3s.h	kvm: Fix page ageing bugs	2014-09-24 14:07:58 +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
booke.c	KVM: PPC: BookE: Fix a sanity check	2016-09-27 15:14:29 +10:00
booke.h	KVM: PPC: Book3e: Add AltiVec support	2014-09-22 10:11:32 +02:00
bookehv_interrupts.S	powerpc/kvm: common sw breakpoint instr across ppc	2014-09-22 10:11:36 +02:00
e500_emulate.c	KVM: PPC: e500: Emulate TMCFG0 TMRN register	2015-10-15 15:58:16 +11:00
e500_mmu_host.c	kvm: rename pfn_t to kvm_pfn_t	2016-01-15 17:56:32 -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
e500_mmu.c	KVM: PPC: e500: Rename jump labels in kvmppc_e500_tlb_init()	2016-09-13 14:32:47 +10:00
e500.c	KVM: PPC: e500: fix handling local_sid_lookup result	2015-10-15 15:58:16 +11:00
e500.h	kvm: rename pfn_t to kvm_pfn_t	2016-01-15 17:56:32 -08:00
e500mc.c	powerpc: Fix misspellings in comments.	2016-03-01 19:27:20 +11:00
emulate_loadstore.c	KVM: PPC: Pass enum to kvmppc_get_last_inst	2014-09-22 10:11:36 +02:00
emulate.c	KVM: PPC: Book3S PR: Fix illegal opcode emulation	2016-06-20 14:11:25 +10:00
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: select IRQ_BYPASS_MANAGER	2016-09-09 16:26:19 +10:00
Makefile	Merge branch 'kvm-ppc-infrastructure' into kvm-ppc-next	2016-09-09 16:24:23 +10:00
mpic.c	KVM: pass struct kvm to kvm_set_routing_entry	2016-07-14 09:03:56 +02:00
powerpc.c	kvm: add stubs for arch specific debugfs support	2016-09-16 16:57:47 +02:00
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_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: Implement halt polling	2016-09-08 12:21:45 +10:00
trace_pr.h	kvm: rename pfn_t to kvm_pfn_t	2016-01-15 17:56:32 -08:00
trace.h	kvm: powerpc: booke: Move booke related tracepoints to separate header	2013-10-17 15:37:16 +02:00