Sasha Levin c5e015d494 KVM guest: exit idleness when handling KVM_PV_REASON_PAGE_NOT_PRESENT ... KVM_PV_REASON_PAGE_NOT_PRESENT kicks cpu out of idleness, but we haven't marked that spot as an exit from idleness. Not doing so can cause RCU warnings such as: [ 732.788386] =============================== [ 732.789803] [ INFO: suspicious RCU usage. ] [ 732.790032] 3.7.0-rc1-next-20121019-sasha-00002-g6d8d02d-dirty #63 Tainted: G W [ 732.790032] ------------------------------- [ 732.790032] include/linux/rcupdate.h:738 rcu_read_lock() used illegally while idle! [ 732.790032] [ 732.790032] other info that might help us debug this: [ 732.790032] [ 732.790032] [ 732.790032] RCU used illegally from idle CPU! [ 732.790032] rcu_scheduler_active = 1, debug_locks = 1 [ 732.790032] RCU used illegally from extended quiescent state! [ 732.790032] 2 locks held by trinity-child31/8252: [ 732.790032] #0: (&rq->lock){-.-.-.}, at: [<ffffffff83a67528>] __schedule+0x178/0x8f0 [ 732.790032] #1: (rcu_read_lock){.+.+..}, at: [<ffffffff81152bde>] cpuacct_charge+0xe/0x200 [ 732.790032] [ 732.790032] stack backtrace: [ 732.790032] Pid: 8252, comm: trinity-child31 Tainted: G W 3.7.0-rc1-next-20121019-sasha-00002-g6d8d02d-dirty #63 [ 732.790032] Call Trace: [ 732.790032] [<ffffffff8118266b>] lockdep_rcu_suspicious+0x10b/0x120 [ 732.790032] [<ffffffff81152c60>] cpuacct_charge+0x90/0x200 [ 732.790032] [<ffffffff81152bde>] ? cpuacct_charge+0xe/0x200 [ 732.790032] [<ffffffff81158093>] update_curr+0x1a3/0x270 [ 732.790032] [<ffffffff81158a6a>] dequeue_entity+0x2a/0x210 [ 732.790032] [<ffffffff81158ea5>] dequeue_task_fair+0x45/0x130 [ 732.790032] [<ffffffff8114ae29>] dequeue_task+0x89/0xa0 [ 732.790032] [<ffffffff8114bb9e>] deactivate_task+0x1e/0x20 [ 732.790032] [<ffffffff83a67c29>] __schedule+0x879/0x8f0 [ 732.790032] [<ffffffff8117e20d>] ? trace_hardirqs_off+0xd/0x10 [ 732.790032] [<ffffffff810a37a5>] ? kvm_async_pf_task_wait+0x1d5/0x2b0 [ 732.790032] [<ffffffff83a67cf5>] schedule+0x55/0x60 [ 732.790032] [<ffffffff810a37c4>] kvm_async_pf_task_wait+0x1f4/0x2b0 [ 732.790032] [<ffffffff81139e50>] ? abort_exclusive_wait+0xb0/0xb0 [ 732.790032] [<ffffffff81139c25>] ? prepare_to_wait+0x25/0x90 [ 732.790032] [<ffffffff810a3a66>] do_async_page_fault+0x56/0xa0 [ 732.790032] [<ffffffff83a6a6e8>] async_page_fault+0x28/0x30 Signed-off-by: Sasha Levin <sasha.levin@oracle.com> Acked-by: Gleb Natapov <gleb@redhat.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>		2012-10-22 18:03:28 +02:00
..
boot	UAPI: Partition the header include path sets and add uapi/ header directories	2012-10-02 18:01:26 +01:00
configs	x86/Kconfig: Turn off DEBUG_NX_TEST module in defconfigs	2012-09-05 10:43:12 +02:00
crypto	crypto: x86/glue_helper - fix storing of new IV in CBC encryption	2012-10-04 17:45:29 +08:00
ia32	Merge branch 'x86/fpu' into x86/smap	2012-09-21 17:18:44 -07:00
include	KVM updates for the 3.7 merge window	2012-10-04 09:30:33 -07:00
kernel	KVM guest: exit idleness when handling KVM_PV_REASON_PAGE_NOT_PRESENT	2012-10-22 18:03:28 +02:00
kvm	KVM: apic: fix LDR calculation in x2apic mode	2012-10-22 18:03:27 +02:00
lguest
lib	UAPI: x86: Fix insn_sanity build failure after UAPI split	2012-10-02 18:01:56 +01:00
math-emu
mm	Merge branch 'x86-smap-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-10-01 13:59:17 -07:00
net	x86: bpf_jit_comp: add XOR instruction for BPF JIT	2012-09-24 16:54:35 -04:00
oprofile	perf/x86/amd: Unify AMD's generic and family 15h pmus	2012-07-05 21:19:41 +02:00
pci	PCI changes for the 3.7 merge window:	2012-10-01 12:05:36 -07:00
platform	efi: Fix the ACPI BGRT driver for images located in EFI boot services memory	2012-09-29 12:21:03 -07:00
power
realmode	x86, suspend: On wakeup always initialize cr4 and EFER	2012-09-26 15:06:22 -07:00
syscalls	UAPI: Plumb the UAPI Kbuilds into the user header installation and checking	2012-10-02 18:01:57 +01:00
tools	UAPI: x86: Fix the test_get_len tool	2012-10-02 18:01:56 +01:00
um	um: Preinclude include/linux/kern_levels.h	2012-09-27 20:20:09 +02:00
vdso	x86, cpu: Rename checking_wrmsrl() to wrmsrl_safe()	2012-06-07 13:32:04 -07:00
video
xen	Features:	2012-10-02 22:09:10 -07:00
.gitignore
Kbuild	x86, realmode: realmode.bin infrastructure	2012-05-08 11:41:48 -07:00
Kconfig	KVM updates for the 3.7 merge window	2012-10-04 09:30:33 -07:00
Kconfig.cpu	x86/Kconfig: Clean up Kconfig defaults	2012-09-13 17:45:33 +02:00
Kconfig.debug	x86/tlb: add tlb_flushall_shift knob into debugfs	2012-06-27 19:29:10 -07:00
Makefile	Merge branch 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild	2012-09-23 15:40:58 -07:00
Makefile_32.cpu
Makefile.um