Wanpeng Li 910053002e KVM: lapic: fix access preemption timer stuff even if kernel_irqchip=off ...

BUG: unable to handle kernel NULL pointer dereference at 000000000000008c
IP: [<ffffffffc04e0180>] kvm_lapic_hv_timer_in_use+0x10/0x20 [kvm]
PGD 0
Oops: 0000 [#1] SMP
Call Trace:
 kvm_arch_vcpu_load+0x86/0x260 [kvm]
 vcpu_load+0x46/0x60 [kvm]
 kvm_vcpu_ioctl+0x79/0x7c0 [kvm]
 ? __lock_is_held+0x54/0x70
 do_vfs_ioctl+0x96/0x6a0
 ? __fget_light+0x2a/0x90
 SyS_ioctl+0x79/0x90
 do_syscall_64+0x7c/0x1e0
 entry_SYSCALL64_slow_path+0x25/0x25
RIP  [<ffffffffc04e0180>] kvm_lapic_hv_timer_in_use+0x10/0x20 [kvm]
 RSP <ffff8800db1f3d70>
CR2: 000000000000008c
---[ end trace a55fb79d2b3b4ee8 ]---

This can be reproduced steadily by kernel_irqchip=off.

We should not access preemption timer stuff if lapic is emulated in userspace.
This patch fix it by avoiding access preemption timer stuff when kernel_irqchip=off.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Yunhong Jiang <yunhong.jiang@intel.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

2016-08-04 14:21:43 +02:00

..

assigned-dev.c

KVM: x86: use list_for_each_entry*

2016-02-23 15:40:54 +01:00

assigned-dev.h

KVM: x86: move device assignment out of kvm_host.h

2014-11-24 16:53:50 +01:00

cpuid.c

Merge branch 'x86-headers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2016-08-01 14:23:42 -04:00

cpuid.h

Revert "KVM: x86: add pcommit support"

2016-07-23 11:04:23 -07:00

emulate.c

x86/kvm: Audit and remove any unnecessary uses of module.h

2016-07-14 15:07:00 +02:00

hyperv.c

KVM: Hyper-V: do not do hypercall userspace exits if SynIC is disabled

2016-04-01 12:10:09 +02:00

hyperv.h

kvm/x86: Hyper-V SynIC timers

2015-12-16 18:49:45 +01:00

i8254.c

KVM: x86: protect KVM_CREATE_PIT/KVM_CREATE_PIT2 with kvm->lock

2016-06-03 15:28:19 +02:00

i8254.h

KVM: i8254: turn kvm_kpit_state.reinject into atomic_t

2016-03-04 09:30:25 +01:00

i8259.c

KVM: x86: clean/fix memory barriers in irqchip_in_kernel

2015-07-30 16:02:56 +02:00

ioapic.c

KVM: x86: Rename kvm_apic_get_reg to kvm_lapic_get_reg

2016-05-18 18:04:25 +02:00

ioapic.h

kvm: x86: Track irq vectors in ioapic->rtc_status.dest_map

2016-03-03 14:36:18 +01:00

iommu.c

- ARM: GICv3 ITS emulation and various fixes. Removal of the old

2016-08-02 16:11:27 -04:00

irq_comm.c

KVM: x86: add KVM_CAP_X2APIC_API

2016-07-14 09:03:57 +02:00

irq.c

x86/kvm: Audit and remove any unnecessary uses of module.h

2016-07-14 15:07:00 +02:00

irq.h

KVM: Move kvm_setup_default/empty_irq_routing declaration in arch specific header

2016-07-22 18:52:00 +01:00

Kconfig

KVM: remove kvm_vcpu_compatible

2016-06-16 00:05:00 +02:00

kvm_cache_regs.h

KVM, pkeys: add pkeys support for permission_fault

2016-03-22 16:23:37 +01:00

lapic.c

KVM: lapic: fix access preemption timer stuff even if kernel_irqchip=off

2016-08-04 14:21:43 +02:00

lapic.h

KVM: x86: use hardware-compatible format for APIC ID register

2016-07-14 09:03:54 +02:00

Makefile

KVM: page track: add the framework of guest page tracking

2016-03-03 14:36:20 +01:00

mmu_audit.c

kvm: rename pfn_t to kvm_pfn_t

2016-01-15 17:56:32 -08:00

mmu.c

- ARM: GICv3 ITS emulation and various fixes. Removal of the old

2016-08-02 16:11:27 -04:00

mmu.h

kvm: mmu: remove is_present_gpte()

2016-07-14 09:02:47 +02:00

mmutrace.h

tracing: Rename ftrace_event.h to trace_events.h

2015-05-13 14:05:12 -04:00

mtrr.c

KVM: MTRR: fix kvm_mtrr_check_gfn_range_consistency page fault

2016-07-05 16:14:43 +02:00

page_track.c

KVM: page_track: fix access to NULL slot

2016-03-22 17:27:28 +01:00

paging_tmpl.h

kvm: mmu: track read permission explicitly for shadow EPT page tables

2016-07-14 09:03:50 +02:00

pmu_amd.c

KVM: x86/vPMU: Fix unnecessary signed extension for AMD PERFCTRn

2015-08-11 15:19:41 +02:00

pmu_intel.c

KVM: x86: Fix typos

2016-06-14 11:16:28 +02:00

pmu.c

KVM: x86: consolidate different ways to test for in-kernel LAPIC

2016-02-09 16:57:45 +01:00

pmu.h

KVM: x86/vPMU: Define kvm_pmu_ops to support vPMU function dispatch

2015-06-23 14:12:14 +02:00

svm.c

- ARM: GICv3 ITS emulation and various fixes. Removal of the old

2016-08-02 16:11:27 -04:00

trace.h

KVM: x86: support using the vmx preemption timer for tsc deadline timer

2016-06-16 10:07:48 +02:00

tss.h

KVM: x86: hardware task switching support

2008-04-27 12:00:39 +03:00

vmx.c

- ARM: GICv3 ITS emulation and various fixes. Removal of the old

2016-08-02 16:11:27 -04:00

x86.c

- ARM: GICv3 ITS emulation and various fixes. Removal of the old

2016-08-02 16:11:27 -04:00

x86.h

KVM: x86: move nsec_to_cycles from x86.c to x86.h

2016-06-27 15:30:38 +02:00