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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>		13 years ago
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Kconfig	…
assigned-dev.c	…
async_pf.c	KVM: fix the race while wakeup all pv guest	14 years ago
async_pf.h	KVM: Halt vcpu if page it tries to access is swapped out	14 years ago
coalesced_mmio.c	…
coalesced_mmio.h	…
eventfd.c	…
ioapic.c	KVM: drop bsp_vcpu pointer from kvm struct	13 years ago
ioapic.h	…
iodev.h	KVM: remove in_range from io devices	16 years ago
iommu.c	module_param: make bool parameters really bool (drivers & misc)	13 years ago
irq_comm.c	…
kvm_main.c	KVM: Fix __set_bit() race in mark_page_dirty() during dirty logging	13 years ago