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Xiao Guangrong 4b9d3a0451 KVM: VMX: fix rcu usage warning in init_rmode() 
fix:

[ INFO: suspicious rcu_dereference_check() usage. ]
---------------------------------------------------
include/linux/kvm_host.h:258 invoked rcu_dereference_check() without protection!

other info that might help us debug this:

rcu_scheduler_active = 1, debug_locks = 1
1 lock held by qemu-system-x86/3796:
 #0:  (&vcpu->mutex){+.+.+.}, at: [<ffffffffa0217fd8>] vcpu_load+0x1a/0x66 [kvm]

stack backtrace:
Pid: 3796, comm: qemu-system-x86 Not tainted 2.6.34 #25
Call Trace:
 [<ffffffff81070ed1>] lockdep_rcu_dereference+0x9d/0xa5
 [<ffffffffa0214fdf>] gfn_to_memslot_unaliased+0x65/0xa0 [kvm]
 [<ffffffffa0216139>] gfn_to_hva+0x22/0x4c [kvm]
 [<ffffffffa0216217>] kvm_write_guest_page+0x2a/0x7f [kvm]
 [<ffffffffa0216286>] kvm_clear_guest_page+0x1a/0x1c [kvm]
 [<ffffffffa0278239>] init_rmode+0x3b/0x180 [kvm_intel]
 [<ffffffffa02786ce>] vmx_set_cr0+0x350/0x4d3 [kvm_intel]
 [<ffffffffa02274ff>] kvm_arch_vcpu_ioctl_set_sregs+0x122/0x31a [kvm]
 [<ffffffffa021859c>] kvm_vcpu_ioctl+0x578/0xa3d [kvm]
 [<ffffffff8106624c>] ? cpu_clock+0x2d/0x40
 [<ffffffff810f7d86>] ? fget_light+0x244/0x28e
 [<ffffffff810709b9>] ? trace_hardirqs_off_caller+0x1f/0x10e
 [<ffffffff8110501b>] vfs_ioctl+0x32/0xa6
 [<ffffffff81105597>] do_vfs_ioctl+0x47f/0x4b8
 [<ffffffff813ae654>] ? sub_preempt_count+0xa3/0xb7
 [<ffffffff810f7da8>] ? fget_light+0x266/0x28e
 [<ffffffff810f7c53>] ? fget_light+0x111/0x28e
 [<ffffffff81105617>] sys_ioctl+0x47/0x6a
 [<ffffffff81002c1b>] system_call_fastpath+0x16/0x1b

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:46:23 +03:00
..
alpha alpha: Detect Super IO chip, no IDE on Avanti, enable EPP19 2010-06-15 14:19:08 -04:00
arm Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/lrg/voltage-2.6 2010-07-28 19:59:55 -07:00
avr32 serial: fix rs485 for atmel_serial on avr32 2010-07-26 11:59:31 -07:00
blackfin blackfin: use use asm-generic/scatterlist.h 2010-05-27 09:12:55 -07:00
cris Merge branch 'for-linus' of git://www.jni.nu/cris 2010-06-01 08:51:25 -07:00
frv FRV: Reinstate null behaviour for the GDB remote protocol 'p' command 2010-06-09 12:42:44 -07:00
h8300 Merge branch 'for-35' of git://repo.or.cz/linux-kbuild 2010-06-01 08:55:52 -07:00
ia64 KVM: move vcpu locking to dispatcher for generic vcpu ioctls 2010-08-01 10:35:47 +03:00
m32r m32r: invoke oom-killer from page fault 2010-06-04 15:21:44 -07:00
m68k Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k 2010-05-27 10:19:19 -07:00
m68knommu Merge branch 'for-35' of git://repo.or.cz/linux-kbuild 2010-06-01 08:55:52 -07:00
microblaze lmb: rename to memblock 2010-07-14 17:14:00 +10:00
mips MIPS: Set io_map_base for several PCI bridges lacking it 2010-07-26 19:08:19 +01:00
mn10300 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2010-06-11 14:15:44 -07:00
parisc Merge branch 'for-35' of git://repo.or.cz/linux-kbuild 2010-06-01 08:55:52 -07:00
powerpc KVM: PPC: elide struct thread_struct instances from stack 2010-08-01 10:39:24 +03:00
s390 KVM: Consolidate arch specific vcpu ioctl locking 2010-08-01 10:35:48 +03:00
score asm-generic: remove ISA_DMA_THRESHOLD in scatterlist.h 2010-05-27 09:12:54 -07:00
sh lmb: rename to memblock 2010-07-14 17:14:00 +10:00
sparc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6 2010-07-21 09:28:50 -07:00
um um: os-linux/mem.c needs sys/stat.h 2010-06-29 15:29:32 -07:00
x86 KVM: VMX: fix rcu usage warning in init_rmode() 2010-08-01 10:46:23 +03:00
xtensa xtensa: invoke oom-killer from page fault 2010-06-04 15:21:44 -07:00
.gitignore
Kconfig hw-breakpoints: Separate constraint space for data and instruction breakpoints 2010-05-01 04:32:11 +02:00