Takuya Yoshikawa 50e92b3c97 KVM: Fix __set_bit() race in mark_page_dirty() during dirty logging ... It is possible that the __set_bit() in mark_page_dirty() is called simultaneously on the same region of memory, which may result in only one bit being set, because some callers do not take mmu_lock before mark_page_dirty(). This problem is hard to produce because when we reach mark_page_dirty() beginning from, e.g., tdp_page_fault(), mmu_lock is being held during __direct_map(): making kvm-unit-tests' dirty log api test write to two pages concurrently was not useful for this reason. So we have confirmed that there can actually be race condition by checking if some callers really reach there without holding mmu_lock using spin_is_locked(): probably they were from kvm_write_guest_page(). To fix this race, this patch changes the bit operation to the atomic version: note that nr_dirty_pages also suffers from the race but we do not need exactly correct numbers for now. Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>		2012-02-01 11:42:32 +02:00
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assigned-dev.c	KVM: Device assignment permission checks	2011-12-25 19:03:54 +02:00
async_pf.c	KVM: fix the race while wakeup all pv guest	2011-01-12 11:29:03 +02:00
async_pf.h	KVM: Halt vcpu if page it tries to access is swapped out	2011-01-12 11:21:39 +02:00
coalesced_mmio.c	KVM: make checks stricter in coalesced_mmio_in_range()	2011-12-27 11:17:07 +02:00
coalesced_mmio.h	KVM: Make coalesced mmio use a device per zone	2011-09-25 19:17:57 +03:00
eventfd.c	KVM: Intelligent device lookup on I/O bus	2011-09-25 19:17:59 +03:00
ioapic.c	KVM: drop bsp_vcpu pointer from kvm struct	2011-12-27 11:22:32 +02:00
ioapic.h	KVM: convert ioapic lock to spinlock	2010-05-13 01:23:55 -03:00
iodev.h	KVM: remove in_range from io devices	2009-09-10 08:33:05 +03:00
iommu.c	module_param: make bool parameters really bool (drivers & misc)	2012-01-13 09:32:20 +10:30
irq_comm.c	KVM: fast-path msi injection with irqfd	2011-01-12 11:29:38 +02:00
Kconfig	KVM: Halt vcpu if page it tries to access is swapped out	2011-01-12 11:21:39 +02:00
kvm_main.c	KVM: Fix __set_bit() race in mark_page_dirty() during dirty logging	2012-02-01 11:42:32 +02:00