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Xiao Guangrong 85b7059169 KVM: MMU: fix shrinking page from the empty mmu 
Fix:

 [ 3190.059226] BUG: unable to handle kernel NULL pointer dereference at           (null)
 [ 3190.062224] IP: [<ffffffffa02aac66>] mmu_page_zap_pte+0x10/0xa7 [kvm]
 [ 3190.063760] PGD 104f50067 PUD 112bea067 PMD 0
 [ 3190.065309] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
 [ 3190.066860] CPU 1
[ ...... ]
 [ 3190.109629] Call Trace:
 [ 3190.111342]  [<ffffffffa02aada6>] kvm_mmu_prepare_zap_page+0xa9/0x1fc [kvm]
 [ 3190.113091]  [<ffffffffa02ab2f5>] mmu_shrink+0x11f/0x1f3 [kvm]
 [ 3190.114844]  [<ffffffffa02ab25d>] ? mmu_shrink+0x87/0x1f3 [kvm]
 [ 3190.116598]  [<ffffffff81150c9d>] ? prune_super+0x142/0x154
 [ 3190.118333]  [<ffffffff8110a4f4>] ? shrink_slab+0x39/0x31e
 [ 3190.120043]  [<ffffffff8110a687>] shrink_slab+0x1cc/0x31e
 [ 3190.121718]  [<ffffffff8110ca1d>] do_try_to_free_pages

This is caused by shrinking page from the empty mmu, although we have
checked n_used_mmu_pages, it is useless since the check is out of mmu-lock

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
 		2012-07-03 17:31:50 -03:00
..
Kconfig KVM: Introduce direct MSI message injection for in-kernel irqchips 2012-04-24 15:59:47 +03:00
Makefile KVM: Expose a version 2 architectural PMU to a guests 2011-12-27 11:24:29 +02:00
cpuid.c KVM: fix cpuid eax for KVM leaf 2012-05-06 15:51:56 +03:00
cpuid.h KVM: SVM: Add support for AMD's OSVW feature in guests 2012-03-05 14:52:21 +02:00
emulate.c KVM: x86 emulator: convert bsf/bsr instructions to emulate_2op_SrcV_nobyte() 2012-05-14 11:32:38 +03:00
i8254.c KVM: x86: Run PIT work in own kthread 2012-04-27 19:40:29 -03:00
i8254.h KVM: x86: Run PIT work in own kthread 2012-04-27 19:40:29 -03:00
i8259.c KVM: x86: reset edge sense circuit of i8259 on init 2012-03-05 14:57:30 +02:00
irq.c
…
irq.h KVM: Intelligent device lookup on I/O bus 2011-09-25 19:17:59 +03:00
kvm_cache_regs.h KVM: MMU: Do not unconditionally read PDPTE from guest memory 2011-09-25 19:18:01 +03:00
kvm_timer.h KVM: emulate lapic tsc deadline timer for guest 2011-10-05 15:34:56 +02:00
lapic.c KVM: Introduce bitmask for apic attention reasons 2012-04-24 16:36:18 +03:00
lapic.h KVM: Expose kvm_lapic_local_deliver() 2011-12-27 11:23:39 +02:00
mmu.c KVM: MMU: fix shrinking page from the empty mmu 2012-07-03 17:31:50 -03:00
mmu.h KVM: MMU: mmio page fault support 2011-07-24 11:50:40 +03:00
mmu_audit.c KVM: MMU: Improve iteration through sptes from rmap 2012-04-08 16:08:27 +03:00
mmutrace.h KVM: MMU: audit: replace mmu audit tracepoint with jump-label 2011-12-27 11:22:05 +02:00
paging_tmpl.h KVM: MMU: use page table level macro 2012-04-18 23:35:01 -03:00
pmu.c KVM: PMU emulation: GLOBAL_CTRL MSR should be enabled on reset 2012-04-10 15:34:10 +03:00
svm.c KVM: SVM: Auto-load on CPUs with SVM 2012-04-16 20:35:04 -03:00
timer.c KVM: x86: Simplify kvm timer handler 2011-12-27 11:17:05 +02:00
trace.h KVM: Use __print_symbolic() for vmexit tracepoints 2011-09-25 19:17:59 +03:00
tss.h
…
vmx.c KVM: VMX: Optimize %ds, %es reload 2012-05-16 16:03:19 -03:00
x86.c Merge branch 'next' of git://git.kernel.org/pub/scm/virt/kvm/kvm 2012-05-24 16:17:30 -07:00
x86.h KVM: x86: add paging gcc optimization 2012-04-08 14:03:13 +03:00