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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
..
boot
Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
2016-08-02 16:37:12 -04:00
configs
arch/defconfig: remove CONFIG_RESOURCE_COUNTERS
2016-05-23 17:04:14 -07:00
crypto
x86, crypto: Restore MODULE_LICENSE() to glue_helper.c so it loads
2016-07-20 09:39:50 +02:00
entry
x86: vdso: use __pvclock_read_cycles
2016-08-04 13:52:21 +02:00
events
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
ia32
mm: remove more IS_ERR_VALUE abuses
2016-05-27 15:57:31 -07:00
include
pvclock: introduce seqcount-like API
2016-08-04 13:52:21 +02:00
kernel
pvclock: introduce seqcount-like API
2016-08-04 13:52:21 +02:00
kvm
KVM: lapic: fix access preemption timer stuff even if kernel_irqchip=off
2016-08-04 14:21:43 +02:00
lguest
lguest: Read offset of device_cap later
2016-06-10 11:39:09 +02:00
lib
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
math-emu
…
mm
treewide: replace obsolete _refok by __ref
2016-08-02 17:31:41 -04:00
net
bpf, x86: add support for constant blinding
2016-05-16 13:49:32 -04:00
oprofile
x86/cpufeature: Replace cpu_has_apic with boot_cpu_has() usage
2016-04-13 11:37:41 +02:00
pci
PCI changes for the v4.8 merge window:
2016-08-02 17:12:29 -04:00
platform
treewide: replace obsolete _refok by __ref
2016-08-02 17:31:41 -04:00
power
x86/power/64: Fix hibernation return address corruption
2016-07-29 13:38:59 +02:00
purgatory
Add sancov plugin
2016-06-07 22:57:10 +02:00
ras
x86/RAS/AMD: Reduce the number of IPIs when prepping error injection
2016-07-08 11:29:26 +02:00
realmode
Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
2016-08-02 16:37:12 -04:00
tools
x86/insn: Add AVX-512 support to the instruction decoder
2016-07-21 09:37:11 -03:00
um
x86: Audit and remove any remaining unnecessary uses of module.h
2016-07-14 15:07:00 +02:00
video
x86/video: Don't assume all FB devices are PCI devices
2016-03-15 11:08:26 +01:00
xen
kexec: allow kdump with crash_kexec_post_notifiers
2016-08-02 19:35:30 -04:00
.gitignore
…
Kbuild
perf/x86: Move perf_event.c ............... => x86/events/core.c
2016-02-09 10:23:49 +01:00
Kconfig
Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
2016-08-02 16:37:12 -04:00
Kconfig.cpu
…
Kconfig.debug
Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-03-15 09:32:27 -07:00
Makefile
kbuild: abort build on bad stack protector flag
2016-07-26 16:19:19 -07:00
Makefile_32.cpu
…
Makefile.um
…